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+/**********************************************************************
+**
+** Implementation of TQCanvas and associated classes
+**
+** Created : 991211
+**
+** Copyright (C) 1999-2008 Trolltech ASA. All rights reserved.
+**
+** This file is part of the canvas module of the TQt GUI Toolkit.
+**
+** This file may be used under the terms of the GNU General
+** Public License versions 2.0 or 3.0 as published by the Free
+** Software Foundation and appearing in the files LICENSE.GPL2
+** and LICENSE.GPL3 included in the packaging of this file.
+** Alternatively you may (at your option) use any later version
+** of the GNU General Public License if such license has been
+** publicly approved by Trolltech ASA (or its successors, if any)
+** and the KDE Free TQt Foundation.
+**
+** Please review the following information to ensure GNU General
+** Public Licensing requirements will be met:
+** http://trolltech.com/products/qt/licenses/licensing/opensource/.
+** If you are unsure which license is appropriate for your use, please
+** review the following information:
+** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
+** or contact the sales department at sales@trolltech.com.
+**
+** This file may be used under the terms of the Q Public License as
+** defined by Trolltech ASA and appearing in the file LICENSE.TQPL
+** included in the packaging of this file. Licensees holding valid TQt
+** Commercial licenses may use this file in accordance with the TQt
+** Commercial License Agreement provided with the Software.
+**
+** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
+** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted
+** herein.
+**
+**********************************************************************/
+
+#include "tqcanvas.h"
+#ifndef TQT_NO_CANVAS
+#include "tqapplication.h"
+#include "tqbitmap.h"
+#include "tqimage.h"
+#include "tqptrdict.h"
+#include "tqpainter.h"
+#include "tqpolygonscanner.h"
+#include "tqtimer.h"
+#include "tqtl.h"
+
+#include <stdlib.h>
+
+class TQCanvasData {
+public:
+ TQCanvasData() :
+ itemDict(1013), animDict(503)
+ {
+ }
+
+ TQPtrList<TQCanvasView> viewList;
+ TQPtrDict<void> itemDict;
+ TQPtrDict<void> animDict;
+};
+
+class TQCanvasViewData {
+public:
+ TQCanvasViewData() : repaint_from_moving( FALSE ) {}
+#ifndef TQT_NO_TRANSFORMATIONS
+ TQWMatrix xform;
+ TQWMatrix ixform;
+#endif
+ bool repaint_from_moving;
+};
+
+// clusterizer
+
+class TQCanvasClusterizer {
+public:
+ TQCanvasClusterizer(int maxclusters);
+ ~TQCanvasClusterizer();
+
+ void add(int x, int y); // 1x1 rectangle (point)
+ void add(int x, int y, int w, int h);
+ void add(const TQRect& rect);
+
+ void clear();
+ int clusters() { return count; }
+ const TQRect& operator[](int i);
+
+private:
+ TQRect* cluster;
+ int count;
+ const int maxcl;
+};
+
+static
+void include(TQRect& r, const TQRect& rect)
+{
+ if (rect.left()<r.left()) {
+ r.setLeft(rect.left());
+ }
+ if (rect.right()>r.right()) {
+ r.setRight(rect.right());
+ }
+ if (rect.top()<r.top()) {
+ r.setTop(rect.top());
+ }
+ if (rect.bottom()>r.bottom()) {
+ r.setBottom(rect.bottom());
+ }
+}
+
+/*
+A TQCanvasClusterizer groups rectangles (TQRects) into non-overlapping rectangles
+by a merging heuristic.
+*/
+TQCanvasClusterizer::TQCanvasClusterizer(int maxclusters) :
+ cluster(new TQRect[maxclusters]),
+ count(0),
+ maxcl(maxclusters)
+{ }
+
+TQCanvasClusterizer::~TQCanvasClusterizer()
+{
+ delete [] cluster;
+}
+
+void TQCanvasClusterizer::clear()
+{
+ count=0;
+}
+
+void TQCanvasClusterizer::add(int x, int y)
+{
+ add(TQRect(x,y,1,1));
+}
+
+void TQCanvasClusterizer::add(int x, int y, int w, int h)
+{
+ add(TQRect(x,y,w,h));
+}
+
+void TQCanvasClusterizer::add(const TQRect& rect)
+{
+ TQRect biggerrect(rect.x()-1,rect.y()-1,rect.width()+2,rect.height()+2);
+
+ //assert(rect.width()>0 && rect.height()>0);
+
+ int cursor;
+
+ for (cursor=0; cursor<count; cursor++) {
+ if (cluster[cursor].tqcontains(rect)) {
+ // Wholly contained already.
+ return;
+ }
+ }
+
+ int lowestcost=9999999;
+ int cheapest=-1;
+ cursor = 0;
+ while( cursor<count ) {
+ if (cluster[cursor].intersects(biggerrect)) {
+ TQRect larger=cluster[cursor];
+ include(larger,rect);
+ int cost = larger.width()*larger.height() -
+ cluster[cursor].width()*cluster[cursor].height();
+
+ if (cost < lowestcost) {
+ bool bad=FALSE;
+ for (int c=0; c<count && !bad; c++) {
+ bad=cluster[c].intersects(larger) && c!=cursor;
+ }
+ if (!bad) {
+ cheapest=cursor;
+ lowestcost=cost;
+ }
+ }
+ }
+ cursor++;
+ }
+
+ if (cheapest>=0) {
+ include(cluster[cheapest],rect);
+ return;
+ }
+
+ if (count < maxcl) {
+ cluster[count++]=rect;
+ return;
+ }
+
+ // Do cheapest of:
+ // add to closest cluster
+ // do cheapest cluster merge, add to new cluster
+
+ lowestcost=9999999;
+ cheapest=-1;
+ cursor=0;
+ while( cursor<count ) {
+ TQRect larger=cluster[cursor];
+ include(larger,rect);
+ int cost=larger.width()*larger.height()
+ - cluster[cursor].width()*cluster[cursor].height();
+ if (cost < lowestcost) {
+ bool bad=FALSE;
+ for (int c=0; c<count && !bad; c++) {
+ bad=cluster[c].intersects(larger) && c!=cursor;
+ }
+ if (!bad) {
+ cheapest=cursor;
+ lowestcost=cost;
+ }
+ }
+ cursor++;
+ }
+
+ // ###
+ // could make an heuristic guess as to whether we need to bother
+ // looking for a cheap merge.
+
+ int cheapestmerge1 = -1;
+ int cheapestmerge2 = -1;
+
+ int merge1 = 0;
+ while( merge1 < count ) {
+ int merge2=0;
+ while( merge2 < count ) {
+ if( merge1!=merge2) {
+ TQRect larger=cluster[merge1];
+ include(larger,cluster[merge2]);
+ int cost=larger.width()*larger.height()
+ - cluster[merge1].width()*cluster[merge1].height()
+ - cluster[merge2].width()*cluster[merge2].height();
+ if (cost < lowestcost) {
+ bool bad=FALSE;
+ for (int c=0; c<count && !bad; c++) {
+ bad=cluster[c].intersects(larger) && c!=cursor;
+ }
+ if (!bad) {
+ cheapestmerge1=merge1;
+ cheapestmerge2=merge2;
+ lowestcost=cost;
+ }
+ }
+ }
+ merge2++;
+ }
+ merge1++;
+ }
+
+ if (cheapestmerge1>=0) {
+ include(cluster[cheapestmerge1],cluster[cheapestmerge2]);
+ cluster[cheapestmerge2]=cluster[count--];
+ } else {
+ // if (!cheapest) debugRectangles(rect);
+ include(cluster[cheapest],rect);
+ }
+
+ // NB: clusters do not intersect (or intersection will
+ // overwrite). This is a result of the above algorithm,
+ // given the assumption that (x,y) are ordered topleft
+ // to bottomright.
+
+ // ###
+ //
+ // add explicit x/y ordering to that comment, move it to the top
+ // and rephrase it as pre-/post-conditions.
+}
+
+const TQRect& TQCanvasClusterizer::operator[](int i)
+{
+ return cluster[i];
+}
+
+// end of clusterizer
+
+
+
+class TQM_EXPORT_CANVAS TQCanvasItemPtr {
+public:
+ TQCanvasItemPtr() : ptr(0) { }
+ TQCanvasItemPtr( TQCanvasItem* p ) : ptr(p) { }
+
+ bool operator<=(const TQCanvasItemPtr& that) const
+ {
+ // Order same-z objects by identity.
+ if (that.ptr->z()==ptr->z())
+ return that.ptr <= ptr;
+ return that.ptr->z() <= ptr->z();
+ }
+ bool operator<(const TQCanvasItemPtr& that) const
+ {
+ // Order same-z objects by identity.
+ if (that.ptr->z()==ptr->z())
+ return that.ptr < ptr;
+ return that.ptr->z() < ptr->z();
+ }
+ bool operator>(const TQCanvasItemPtr& that) const
+ {
+ // Order same-z objects by identity.
+ if (that.ptr->z()==ptr->z())
+ return that.ptr > ptr;
+ return that.ptr->z() > ptr->z();
+ }
+ bool operator==(const TQCanvasItemPtr& that) const
+ {
+ return that.ptr == ptr;
+ }
+ operator TQCanvasItem*() const { return ptr; }
+
+private:
+ TQCanvasItem* ptr;
+};
+
+
+/*!
+ \class TQCanvasItemList
+ \brief The TQCanvasItemList class is a list of TQCanvasItems.
+\if defined(commercial)
+ It is part of the <a href="commercialeditions.html">TQt Enterprise Edition</a>.
+\endif
+
+ \module canvas
+ \ingroup graphics
+ \ingroup images
+
+ TQCanvasItemList is a TQValueList of pointers to \l{TQCanvasItem}s.
+ This class is used by some methods in TQCanvas that need to return
+ a list of canvas items.
+
+ The \l TQValueList documentation describes how to use this list.
+*/
+
+/*!
+ \internal
+*/
+void TQCanvasItemList::sort()
+{
+ qHeapSort(*((TQValueList<TQCanvasItemPtr>*)this));
+}
+
+/*!
+ \internal
+*/
+void TQCanvasItemList::drawUnique( TQPainter& painter )
+{
+ TQCanvasItem* prev=0;
+ for (Iterator it=fromLast(); it!=end(); --it) {
+ TQCanvasItem *g=*it;
+ if (g!=prev) {
+ g->draw(painter);
+ prev=g;
+ }
+ }
+}
+
+/*!
+ Returns the concatenation of this list and list \a l.
+*/
+TQCanvasItemList TQCanvasItemList::operator+(const TQCanvasItemList &l) const
+{
+ TQCanvasItemList l2(*this);
+ for(const_iterator it = l.begin(); it != l.end(); ++it)
+ l2.append(*it);
+ return l2;
+}
+
+class TQCanvasChunk {
+public:
+ TQCanvasChunk() : changed(TRUE) { }
+ // Other code assumes lists are not deleted. Assignment is also
+ // done on ChunkRecs. So don't add that sort of thing here.
+
+ void sort()
+ {
+ list.sort();
+ }
+
+ const TQCanvasItemList* listPtr() const
+ {
+ return &list;
+ }
+
+ void add(TQCanvasItem* item)
+ {
+ list.prepend(item);
+ changed = TRUE;
+ }
+
+ void remove(TQCanvasItem* item)
+ {
+ list.remove(item);
+ changed = TRUE;
+ }
+
+ void change()
+ {
+ changed = TRUE;
+ }
+
+ bool hasChanged() const
+ {
+ return changed;
+ }
+
+ bool takeChange()
+ {
+ bool y = changed;
+ changed = FALSE;
+ return y;
+ }
+
+private:
+ TQCanvasItemList list;
+ bool changed;
+};
+
+
+static int gcd(int a, int b)
+{
+ int r;
+ while ( (r = a%b) ) {
+ a=b;
+ b=r;
+ }
+ return b;
+}
+
+static int scm(int a, int b)
+{
+ int g = gcd(a,b);
+ return a/g*b;
+}
+
+
+
+/*!
+ \class TQCanvas tqcanvas.h
+ \brief The TQCanvas class provides a 2D area that can contain TQCanvasItem objects.
+\if defined(commercial)
+ It is part of the <a href="commercialeditions.html">TQt Enterprise Edition</a>.
+\endif
+
+ \ingroup abstractwidgets
+ \ingroup graphics
+ \ingroup images
+ \mainclass
+ \module canvas
+
+ The TQCanvas class manages its 2D graphic area and all the canvas
+ items the area tqcontains. The canvas has no visual appearance of
+ its own. Instead, it is displayed on screen using a TQCanvasView.
+ Multiple TQCanvasView widgets may be associated with a canvas to
+ provide multiple views of the same canvas.
+
+ The canvas is optimized for large numbers of items, particularly
+ where only a small percentage of the items change at any
+ one time. If the entire display changes very frequently, you should
+ consider using your own custom TQScrollView subclass.
+
+ TQt provides a rich
+ set of canvas item classes, e.g. TQCanvasEllipse, TQCanvasLine,
+ TQCanvasPolygon, TQCanvasPolygonalItem, TQCanvasRectangle, TQCanvasSpline,
+ TQCanvasSprite and TQCanvasText. You can subclass to create your own
+ canvas items; TQCanvasPolygonalItem is the most common base class used
+ for this purpose.
+
+ Items appear on the canvas after their \link TQCanvasItem::show()
+ show()\endlink function has been called (or \link
+ TQCanvasItem::tqsetVisible() tqsetVisible(TRUE)\endlink), and \e after
+ update() has been called. The canvas only shows items that are
+ \link TQCanvasItem::tqsetVisible() visible\endlink, and then only if
+ \l update() is called. (By default the canvas is white and so are
+ canvas items, so if nothing appears try changing colors.)
+
+ If you created the canvas without passing a width and height to
+ the constructor you must also call resize().
+
+ Although a canvas may appear to be similar to a widget with child
+ widgets, there are several notable differences:
+
+ \list
+ \i Canvas items are usually much faster to manipulate and redraw than
+ child widgets, with the speed advantage becoming especially great when
+ there are \e many canvas items and non-rectangular items. In most
+ situations canvas items are also a lot more memory efficient than child
+ widgets.
+
+ \i It's easy to detect overlapping items (collision detection).
+
+ \i The canvas can be larger than a widget. A million-by-million canvas
+ is perfectly possible. At such a size a widget might be very
+ inefficient, and some window systems might not support it at all,
+ whereas TQCanvas scales well. Even with a billion pixels and a million
+ items, tqfinding a particular canvas item, detecting collisions, etc.,
+ is still fast (though the memory consumption may be prohibitive
+ at such extremes).
+
+ \i Two or more TQCanvasView objects can view the same canvas.
+
+ \i An arbitrary transformation matrix can be set on each TQCanvasView
+ which makes it easy to zoom, rotate or shear the viewed canvas.
+
+ \i Widgets provide a lot more functionality, such as input (TQKeyEvent,
+ TQMouseEvent etc.) and tqlayout management (TQGridLayout etc.).
+
+ \endlist
+
+ A canvas consists of a background, a number of canvas items organized by
+ x, y and z coordinates, and a foreground. A canvas item's z coordinate
+ can be treated as a layer number -- canvas items with a higher z
+ coordinate appear in front of canvas items with a lower z coordinate.
+
+ The background is white by default, but can be set to a different color
+ using setBackgroundColor(), or to a repeated pixmap using
+ setBackgroundPixmap() or to a mosaic of smaller pixmaps using
+ setTiles(). Individual tiles can be set with setTile(). There
+ are corresponding get functions, e.g. backgroundColor() and
+ backgroundPixmap().
+
+ Note that TQCanvas does not inherit from TQWidget, even though it has some
+ functions which provide the same functionality as those in TQWidget. One
+ of these is setBackgroundPixmap(); some others are resize(), size(),
+ width() and height(). \l TQCanvasView is the widget used to display a
+ canvas on the screen.
+
+ Canvas items are added to a canvas by constructing them and passing the
+ canvas to the canvas item's constructor. An item can be moved to a
+ different canvas using TQCanvasItem::setCanvas().
+
+ Canvas items are movable (and in the case of TQCanvasSprites, animated)
+ objects that inherit TQCanvasItem. Each canvas item has a position on the
+ canvas (x, y coordinates) and a height (z coordinate), all of which are
+ held as floating-point numbers. Moving canvas items also have x and y
+ velocities. It's possible for a canvas item to be outside the canvas
+ (for example TQCanvasItem::x() is greater than width()). When a canvas
+ item is off the canvas, onCanvas() returns FALSE and the canvas
+ disregards the item. (Canvas items off the canvas do not slow down any
+ of the common operations on the canvas.)
+
+ Canvas items can be moved with TQCanvasItem::move(). The advance()
+ function moves all TQCanvasItem::animated() canvas items and
+ setAdvancePeriod() makes TQCanvas move them automatically on a periodic
+ basis. In the context of the TQCanvas classes, to `animate' a canvas item
+ is to set it in motion, i.e. using TQCanvasItem::setVelocity(). Animation
+ of a canvas item itself, i.e. items which change over time, is enabled
+ by calling TQCanvasSprite::setFrameAnimation(), or more generally by
+ subclassing and reimplementing TQCanvasItem::advance(). To detect collisions
+ use one of the TQCanvasItem::collisions() functions.
+
+ The changed parts of the canvas are redrawn (if they are visible in a
+ canvas view) whenever update() is called. You can either call update()
+ manually after having changed the contents of the canvas, or force
+ periodic updates using setUpdatePeriod(). If you have moving objects on
+ the canvas, you must call advance() every time the objects should
+ move one step further. Periodic calls to advance() can be forced using
+ setAdvancePeriod(). The advance() function will call
+ TQCanvasItem::advance() on every item that is \link
+ TQCanvasItem::animated() animated\endlink and trigger an update of the
+ affected areas afterwards. (A canvas item that is `animated' is simply
+ a canvas item that is in motion.)
+
+ TQCanvas organizes its canvas items into \e chunks; these are areas on
+ the canvas that are used to speed up most operations. Many operations
+ start by eliminating most chunks (i.e. those which haven't changed)
+ and then process only the canvas items that are in the few interesting
+ (i.e. changed) chunks. A valid chunk, validChunk(), is one which is on
+ the canvas.
+
+ The chunk size is a key factor to TQCanvas's speed: if there are too many
+ chunks, the speed benefit of grouping canvas items into chunks is
+ reduced. If the chunks are too large, it takes too long to process each
+ one. The TQCanvas constructor tries to pick a suitable size, but you
+ can call retune() to change it at any time. The chunkSize() function
+ returns the current chunk size. The canvas items always make sure
+ they're in the right chunks; all you need to make sure of is that
+ the canvas uses the right chunk size. A good rule of thumb is that
+ the size should be a bit smaller than the average canvas item
+ size. If you have moving objects, the chunk size should be a bit
+ smaller than the average size of the moving items.
+
+ The foreground is normally nothing, but if you reimplement
+ drawForeground(), you can draw things in front of all the canvas
+ items.
+
+ Areas can be set as changed with setChanged() and set unchanged with
+ setUnchanged(). The entire canvas can be set as changed with
+ setAllChanged(). A list of all the items on the canvas is returned by
+ allItems().
+
+ An area can be copied (painted) to a TQPainter with drawArea().
+
+ If the canvas is resized it emits the resized() signal.
+
+ The examples/canvas application and the 2D graphics page of the
+ examples/demo application demonstrate many of TQCanvas's facilities.
+
+ \sa TQCanvasView TQCanvasItem
+*/
+void TQCanvas::init(int w, int h, int chunksze, int mxclusters)
+{
+ d = new TQCanvasData;
+ awidth=w;
+ aheight=h;
+ chunksize=chunksze;
+ maxclusters=mxclusters;
+ chwidth=(w+chunksize-1)/chunksize;
+ chheight=(h+chunksize-1)/chunksize;
+ chunks=new TQCanvasChunk[chwidth*chheight];
+ update_timer = 0;
+ bgcolor = Qt::white;
+ grid = 0;
+ htiles = 0;
+ vtiles = 0;
+ dblbuf = TRUE;
+ debug_redraw_areas = FALSE;
+}
+
+/*!
+ Create a TQCanvas with no size. \a tqparent and \a name are passed to
+ the TQObject superclass.
+
+ \warning You \e must call resize() at some time after creation to
+ be able to use the canvas.
+*/
+TQCanvas::TQCanvas( TQObject* tqparent, const char* name )
+ : TQObject( tqparent, name )
+{
+ init(0,0);
+}
+
+/*!
+ Constructs a TQCanvas that is \a w pixels wide and \a h pixels high.
+*/
+TQCanvas::TQCanvas(int w, int h)
+{
+ init(w,h);
+}
+
+/*!
+ Constructs a TQCanvas which will be composed of \a h tiles
+ horizontally and \a v tiles vertically. Each tile will be an image
+ \a tilewidth by \a tileheight pixels taken from pixmap \a p.
+
+ The pixmap \a p is a list of tiles, arranged left to right, (and
+ in the case of pixmaps that have multiple rows of tiles, top to
+ bottom), with tile 0 in the top-left corner, tile 1 next to the
+ right, and so on, e.g.
+
+ \table
+ \row \i 0 \i 1 \i 2 \i 3
+ \row \i 4 \i 5 \i 6 \i 7
+ \endtable
+
+ The TQCanvas is initially sized to show exactly the given number of
+ tiles horizontally and vertically. If it is resized to be larger,
+ the entire matrix of tiles will be repeated as often as necessary
+ to cover the area. If it is smaller, tiles to the right and bottom
+ will not be visible.
+
+ \sa setTiles()
+*/
+TQCanvas::TQCanvas( TQPixmap p,
+ int h, int v, int tilewidth, int tileheight )
+{
+ init(h*tilewidth, v*tileheight, scm(tilewidth,tileheight) );
+ setTiles( p, h, v, tilewidth, tileheight );
+}
+
+void qt_unview(TQCanvas* c)
+{
+ for (TQCanvasView* view=c->d->viewList.first(); view != 0; view=c->d->viewList.next()) {
+ view->viewing = 0;
+ }
+}
+
+/*!
+ Destroys the canvas and all the canvas's canvas items.
+*/
+TQCanvas::~TQCanvas()
+{
+ qt_unview(this);
+ TQCanvasItemList all = allItems();
+ for (TQCanvasItemList::Iterator it=all.begin(); it!=all.end(); ++it)
+ delete *it;
+ delete [] chunks;
+ delete [] grid;
+ delete d;
+}
+
+/*!
+\internal
+Returns the chunk at a chunk position \a i, \a j.
+*/
+TQCanvasChunk& TQCanvas::chunk(int i, int j) const
+{
+ return chunks[i+chwidth*j];
+}
+
+/*!
+\internal
+Returns the chunk at a pixel position \a x, \a y.
+*/
+TQCanvasChunk& TQCanvas::chunkContaining(int x, int y) const
+{
+ return chunk(x/chunksize,y/chunksize);
+}
+
+/*!
+ Returns a list of all the items in the canvas.
+*/
+TQCanvasItemList TQCanvas::allItems()
+{
+ TQCanvasItemList list;
+ for (TQPtrDictIterator<void> it=d->itemDict; it.currentKey(); ++it) {
+ list.prepend((TQCanvasItem*)it.currentKey());
+ }
+ return list;
+}
+
+
+/*!
+ Changes the size of the canvas to have a width of \a w and a
+ height of \a h. This is a slow operation.
+*/
+void TQCanvas::resize(int w, int h)
+{
+ if (awidth==w && aheight==h)
+ return;
+
+ TQCanvasItem* item;
+ TQPtrList<TQCanvasItem> hidden;
+ for (TQPtrDictIterator<void> it=d->itemDict; it.currentKey(); ++it) {
+ if (((TQCanvasItem*)it.currentKey())->isVisible()) {
+ ((TQCanvasItem*)it.currentKey())->hide();
+ hidden.append(((TQCanvasItem*)it.currentKey()));
+ }
+ }
+
+ int nchwidth=(w+chunksize-1)/chunksize;
+ int nchheight=(h+chunksize-1)/chunksize;
+
+ TQCanvasChunk* newchunks = new TQCanvasChunk[nchwidth*nchheight];
+
+ // Commit the new values.
+ //
+ awidth=w;
+ aheight=h;
+ chwidth=nchwidth;
+ chheight=nchheight;
+ delete [] chunks;
+ chunks=newchunks;
+
+ for (item=hidden.first(); item != 0; item=hidden.next()) {
+ item->show();
+ }
+
+ setAllChanged();
+
+ emit resized();
+}
+
+/*!
+ \fn void TQCanvas::resized()
+
+ This signal is emitted whenever the canvas is resized. Each
+ TQCanvasView connects to this signal to keep the scrollview's size
+ correct.
+*/
+
+/*!
+ Change the efficiency tuning parameters to \a mxclusters clusters,
+ each of size \a chunksze. This is a slow operation if there are
+ many objects on the canvas.
+
+ The canvas is divided into chunks which are rectangular areas \a
+ chunksze wide by \a chunksze high. Use a chunk size which is about
+ the average size of the canvas items. If you choose a chunk size
+ which is too small it will increase the amount of calculation
+ required when drawing since each change will affect many chunks.
+ If you choose a chunk size which is too large the amount of
+ drawing required will increase because for each change, a lot of
+ drawing will be required since there will be many (unchanged)
+ canvas items which are in the same chunk as the changed canvas
+ items.
+
+ Internally, a canvas uses a low-resolution "chunk matrix" to keep
+ track of all the items in the canvas. A 64x64 chunk matrix is the
+ default for a 1024x1024 pixel canvas, where each chunk collects
+ canvas items in a 16x16 pixel square. This default is also
+ affected by setTiles(). You can tune this default using this
+ function. For example if you have a very large canvas and want to
+ trade off speed for memory then you might set the chunk size to 32
+ or 64.
+
+ The \a mxclusters argument is the number of rectangular groups of
+ chunks that will be separately drawn. If the canvas has a large
+ number of small, dispersed items, this should be about that
+ number. Our testing suggests that a large number of clusters is
+ almost always best.
+
+*/
+void TQCanvas::retune(int chunksze, int mxclusters)
+{
+ maxclusters=mxclusters;
+
+ if ( chunksize!=chunksze ) {
+ TQPtrList<TQCanvasItem> hidden;
+ for (TQPtrDictIterator<void> it=d->itemDict; it.currentKey(); ++it) {
+ if (((TQCanvasItem*)it.currentKey())->isVisible()) {
+ ((TQCanvasItem*)it.currentKey())->hide();
+ hidden.append(((TQCanvasItem*)it.currentKey()));
+ }
+ }
+
+ chunksize=chunksze;
+
+ int nchwidth=(awidth+chunksize-1)/chunksize;
+ int nchheight=(aheight+chunksize-1)/chunksize;
+
+ TQCanvasChunk* newchunks = new TQCanvasChunk[nchwidth*nchheight];
+
+ // Commit the new values.
+ //
+ chwidth=nchwidth;
+ chheight=nchheight;
+ delete [] chunks;
+ chunks=newchunks;
+
+ for (TQCanvasItem* item=hidden.first(); item != 0; item=hidden.next()) {
+ item->show();
+ }
+ }
+}
+
+/*!
+ \fn int TQCanvas::width() const
+
+ Returns the width of the canvas, in pixels.
+*/
+
+/*!
+ \fn int TQCanvas::height() const
+
+ Returns the height of the canvas, in pixels.
+*/
+
+/*!
+ \fn TQSize TQCanvas::size() const
+
+ Returns the size of the canvas, in pixels.
+*/
+
+/*!
+ \fn TQRect TQCanvas::rect() const
+
+ Returns a rectangle the size of the canvas.
+*/
+
+
+/*!
+ \fn bool TQCanvas::onCanvas( int x, int y ) const
+
+ Returns TRUE if the pixel position (\a x, \a y) is on the canvas;
+ otherwise returns FALSE.
+
+ \sa validChunk()
+*/
+
+/*!
+ \fn bool TQCanvas::onCanvas( const TQPoint& p ) const
+ \overload
+
+ Returns TRUE if the pixel position \a p is on the canvas;
+ otherwise returns FALSE.
+
+ \sa validChunk()
+*/
+
+/*!
+ \fn bool TQCanvas::validChunk( int x, int y ) const
+
+ Returns TRUE if the chunk position (\a x, \a y) is on the canvas;
+ otherwise returns FALSE.
+
+ \sa onCanvas()
+*/
+
+/*!
+ \fn bool TQCanvas::validChunk( const TQPoint& p ) const
+ \overload
+
+ Returns TRUE if the chunk position \a p is on the canvas; otherwise
+ returns FALSE.
+
+ \sa onCanvas()
+*/
+
+/*!
+ \fn int TQCanvas::chunkSize() const
+
+ Returns the chunk size of the canvas.
+
+ \sa retune()
+*/
+
+/*!
+\fn bool TQCanvas::sameChunk(int x1, int y1, int x2, int y2) const
+\internal
+Tells if the points ( \a x1, \a y1 ) and ( \a x2, \a y2 ) are within the same chunk.
+*/
+
+/*!
+\internal
+This method adds an the item \a item to the list of TQCanvasItem objects
+in the TQCanvas. The TQCanvasItem class calls this.
+*/
+void TQCanvas::addItem(TQCanvasItem* item)
+{
+ d->itemDict.insert((void*)item,(void*)1);
+}
+
+/*!
+\internal
+This method adds the item \a item to the list of TQCanvasItem objects
+to be moved. The TQCanvasItem class calls this.
+*/
+void TQCanvas::addAnimation(TQCanvasItem* item)
+{
+ d->animDict.insert((void*)item,(void*)1);
+}
+
+/*!
+\internal
+This method adds the item \a item to the list of TQCanvasItem objects
+which are no longer to be moved. The TQCanvasItem class calls this.
+*/
+void TQCanvas::removeAnimation(TQCanvasItem* item)
+{
+ d->animDict.remove((void*)item);
+}
+
+/*!
+\internal
+This method removes the item \a item from the list of TQCanvasItem objects
+in this TQCanvas. The TQCanvasItem class calls this.
+*/
+void TQCanvas::removeItem(TQCanvasItem* item)
+{
+ d->itemDict.remove((void*)item);
+}
+
+/*!
+\internal
+This method adds the view \a view to the list of TQCanvasView objects
+viewing this TQCanvas. The TQCanvasView class calls this.
+*/
+void TQCanvas::addView(TQCanvasView* view)
+{
+ d->viewList.append(view);
+ if ( htiles>1 || vtiles>1 || pm.isNull() )
+ view->viewport()->setBackgroundColor(backgroundColor());
+}
+
+/*!
+\internal
+This method removes the view \a view from the list of TQCanvasView objects
+viewing this TQCanvas. The TQCanvasView class calls this.
+*/
+void TQCanvas::removeView(TQCanvasView* view)
+{
+ d->viewList.removeRef(view);
+}
+
+/*!
+ Sets the canvas to call advance() every \a ms milliseconds. Any
+ previous setting by setAdvancePeriod() or setUpdatePeriod() is
+ overridden.
+
+ If \a ms is less than 0 advancing will be stopped.
+*/
+void TQCanvas::setAdvancePeriod(int ms)
+{
+ if ( ms<0 ) {
+ if ( update_timer )
+ update_timer->stop();
+ } else {
+ if ( update_timer )
+ delete update_timer;
+ update_timer = new TQTimer(this);
+ connect(update_timer,TQT_SIGNAL(timeout()),this,TQT_SLOT(advance()));
+ update_timer->start(ms);
+ }
+}
+
+/*!
+ Sets the canvas to call update() every \a ms milliseconds. Any
+ previous setting by setAdvancePeriod() or setUpdatePeriod() is
+ overridden.
+
+ If \a ms is less than 0 automatic updating will be stopped.
+*/
+void TQCanvas::setUpdatePeriod(int ms)
+{
+ if ( ms<0 ) {
+ if ( update_timer )
+ update_timer->stop();
+ } else {
+ if ( update_timer )
+ delete update_timer;
+ update_timer = new TQTimer(this);
+ connect(update_timer,TQT_SIGNAL(timeout()),this,TQT_SLOT(update()));
+ update_timer->start(ms);
+ }
+}
+
+/*!
+ Moves all TQCanvasItem::animated() canvas items on the canvas and
+ refreshes all changes to all views of the canvas. (An `animated'
+ item is an item that is in motion; see setVelocity().)
+
+ The advance takes place in two phases. In phase 0, the
+ TQCanvasItem::advance() function of each TQCanvasItem::animated()
+ canvas item is called with paramater 0. Then all these canvas
+ items are called again, with parameter 1. In phase 0, the canvas
+ items should not change position, merely examine other items on
+ the canvas for which special processing is required, such as
+ collisions between items. In phase 1, all canvas items should
+ change positions, ignoring any other items on the canvas. This
+ two-phase approach allows for considerations of "fairness",
+ although no TQCanvasItem subclasses supplied with TQt do anything
+ interesting in phase 0.
+
+ The canvas can be configured to call this function periodically
+ with setAdvancePeriod().
+
+ \sa update()
+*/
+void TQCanvas::advance()
+{
+ TQPtrDictIterator<void> it=d->animDict;
+ while ( it.current() ) {
+ TQCanvasItem* i = (TQCanvasItem*)(void*)it.currentKey();
+ ++it;
+ if ( i )
+ i->advance(0);
+ }
+ // we expect the dict tqcontains the exact same items as in the
+ // first pass.
+ it.toFirst();
+ while ( it.current() ) {
+ TQCanvasItem* i = (TQCanvasItem*)(void*)it.currentKey();
+ ++it;
+ if ( i )
+ i->advance(1);
+ }
+ update();
+}
+
+// Don't call this unless you know what you're doing.
+// p is in the content's co-ordinate example.
+/*!
+ \internal
+*/
+void TQCanvas::drawViewArea( TQCanvasView* view, TQPainter* p, const TQRect& vr, bool dbuf )
+{
+ TQPoint tl = view->contentsToViewport(TQPoint(0,0));
+
+#ifndef TQT_NO_TRANSFORMATIONS
+ TQWMatrix wm = view->tqworldMatrix();
+ TQWMatrix iwm = wm.invert();
+ // ivr = covers all chunks in vr
+ TQRect ivr = iwm.map(vr);
+ ivr.addCoords(-1, -1, 1, 1);
+ TQWMatrix twm;
+ twm.translate(tl.x(),tl.y());
+#else
+ TQRect ivr = vr;
+#endif
+
+ TQRect all(0,0,width(),height());
+
+ if ( !all.tqcontains(ivr) ) {
+ // Need to clip with edge of canvas.
+
+#ifndef TQT_NO_TRANSFORMATIONS
+ // For translation-only transformation, it is safe to include the right
+ // and bottom edges, but otherwise, these must be excluded since they
+ // are not precisely defined (different bresenham paths).
+ TQPointArray a;
+ if ( wm.m12()==0.0 && wm.m21()==0.0 && wm.m11() == 1.0 && wm.m22() == 1.0 )
+ a = TQPointArray( TQRect(all.x(),all.y(),all.width()+1,all.height()+1) );
+ else
+ a = TQPointArray( all );
+
+ a = (wm*twm).map(a);
+#else
+ TQPointArray a( TQRect(all.x(),all.y(),all.width()+1,all.height()+1) );
+#endif
+ if ( view->viewport()->backgroundMode() == TQt::NoBackground ) {
+ TQRect cvr = vr; cvr.moveBy(tl.x(),tl.y());
+ p->setClipRegion(TQRegion(cvr)-TQRegion(a));
+ p->fillRect(vr,view->viewport()->palette()
+ .brush(TQPalette::Active,TQColorGroup::Background));
+ }
+ p->setClipRegion(a);
+ }
+
+ if ( dbuf ) {
+ offscr = TQPixmap(vr.size().expandedTo(TQSize(1, 1)));
+#ifdef TQ_WS_X11
+ offscr.x11SetScreen(p->tqdevice()->x11Screen());
+#endif
+ TQPainter dbp(&offscr);
+#ifndef TQT_NO_TRANSFORMATIONS
+ twm.translate(-vr.x(),-vr.y());
+ twm.translate(-tl.x(),-tl.y());
+ dbp.setWorldMatrix( wm*twm, TRUE );
+#else
+ dbp.translate(-vr.x()-tl.x(),-vr.y()-tl.y());
+#endif
+ dbp.setClipRect(0,0,vr.width(), vr.height());
+ drawCanvasArea(ivr,&dbp,FALSE);
+ dbp.end();
+ p->drawPixmap(vr.x(), vr.y(), offscr, 0, 0, vr.width(), vr.height());
+ } else {
+ TQRect r = vr; r.moveBy(tl.x(),tl.y()); // move to untransformed co-ords
+ if ( !all.tqcontains(ivr) ) {
+ TQRegion inside = p->clipRegion() & r;
+ //TQRegion outside = p->clipRegion() - r;
+ //p->setClipRegion(outside);
+ //p->fillRect(outside.boundingRect(),red);
+ p->setClipRegion(inside);
+ } else {
+ p->setClipRect(r);
+ }
+#ifndef TQT_NO_TRANSFORMATIONS
+ p->setWorldMatrix( wm*twm );
+#else
+#endif
+ p->setBrushOrigin(tl.x(), tl.y());
+ drawCanvasArea(ivr,p,FALSE);
+ }
+}
+
+/*!
+ Repaints changed areas in all views of the canvas.
+
+ \sa advance()
+*/
+void TQCanvas::update()
+{
+ TQCanvasClusterizer clusterizer(d->viewList.count());
+#ifndef TQT_NO_TRANSFORMATIONS
+ TQPtrList<TQRect> doneareas;
+ doneareas.setAutoDelete(TRUE);
+#endif
+
+ TQPtrListIterator<TQCanvasView> it(d->viewList);
+ TQCanvasView* view;
+ while( (view=it.current()) != 0 ) {
+ ++it;
+#ifndef TQT_NO_TRANSFORMATIONS
+ TQWMatrix wm = view->tqworldMatrix();
+#endif
+ TQRect area(view->contentsX(),view->contentsY(),
+ view->visibleWidth(),view->visibleHeight());
+ if (area.width()>0 && area.height()>0) {
+#ifndef TQT_NO_TRANSFORMATIONS
+ if ( !wm.isIdentity() ) {
+ // r = Visible area of the canvas where there are changes
+ TQRect r = changeBounds(view->inverseWorldMatrix().map(area));
+ if ( !r.isEmpty() ) {
+ TQPainter p(view->viewport());
+ // Translate to the coordinate system of drawViewArea().
+ TQPoint tl = view->contentsToViewport(TQPoint(0,0));
+ p.translate(tl.x(),tl.y());
+ drawViewArea( view, &p, wm.map(r), dblbuf );
+ doneareas.append(new TQRect(r));
+ }
+ } else
+#endif
+ {
+ clusterizer.add(area);
+ }
+ }
+ }
+
+ for (int i=0; i<clusterizer.clusters(); i++)
+ drawChanges(clusterizer[i]);
+
+#ifndef TQT_NO_TRANSFORMATIONS
+ for ( TQRect* r=doneareas.first(); r != 0; r=doneareas.next() )
+ setUnchanged(*r);
+#endif
+}
+
+
+// ### warwick - setAllChanged() is not a set function. please rename
+// it. ditto setChanged(). markChanged(), perhaps?
+// ### unfortunately this function is virtual, which makes renaming more difficult. Lars
+
+/*!
+ Marks the whole canvas as changed.
+ All views of the canvas will be entirely redrawn when
+ update() is called next.
+*/
+void TQCanvas::setAllChanged()
+{
+ setChanged(TQRect(0,0,width(),height()));
+}
+
+/*!
+ Marks \a area as changed. This \a area will be redrawn in all
+ views that are showing it when update() is called next.
+*/
+void TQCanvas::setChanged(const TQRect& area)
+{
+ TQRect thearea = area.intersect(TQRect(0,0,width(),height()));
+
+ int mx = (thearea.x()+thearea.width()+chunksize)/chunksize;
+ int my = (thearea.y()+thearea.height()+chunksize)/chunksize;
+ if (mx>chwidth)
+ mx=chwidth;
+ if (my>chheight)
+ my=chheight;
+
+ int x=thearea.x()/chunksize;
+ while( x<mx) {
+ int y = thearea.y()/chunksize;
+ while( y<my ) {
+ chunk(x,y).change();
+ y++;
+ }
+ x++;
+ }
+}
+
+/*!
+ Marks \a area as \e unchanged. The area will \e not be redrawn in
+ the views for the next update(), unless it is marked or changed
+ again before the next call to update().
+*/
+void TQCanvas::setUnchanged(const TQRect& area)
+{
+ TQRect thearea = area.intersect(TQRect(0,0,width(),height()));
+
+ int mx = (thearea.x()+thearea.width()+chunksize)/chunksize;
+ int my = (thearea.y()+thearea.height()+chunksize)/chunksize;
+ if (mx>chwidth)
+ mx=chwidth;
+ if (my>chheight)
+ my=chheight;
+
+ int x=thearea.x()/chunksize;
+ while( x<mx) {
+ int y = thearea.y()/chunksize;
+ while( y<my ) {
+ chunk(x,y).takeChange();
+ y++;
+ }
+ x++;
+ }
+}
+
+
+/*!
+ \internal
+*/
+TQRect TQCanvas::changeBounds(const TQRect& inarea)
+{
+ TQRect area=inarea.intersect(TQRect(0,0,width(),height()));
+
+ int mx = (area.x()+area.width()+chunksize)/chunksize;
+ int my = (area.y()+area.height()+chunksize)/chunksize;
+ if (mx > chwidth)
+ mx=chwidth;
+ if (my > chheight)
+ my=chheight;
+
+ TQRect result;
+
+ int x=area.x()/chunksize;
+ while( x<mx ) {
+ int y=area.y()/chunksize;
+ while( y<my ) {
+ TQCanvasChunk& ch=chunk(x,y);
+ if ( ch.hasChanged() )
+ result |= TQRect(x,y,1,1);
+ y++;
+ }
+ x++;
+ }
+
+ if ( !result.isEmpty() ) {
+ result.rLeft() *= chunksize;
+ result.rTop() *= chunksize;
+ result.rRight() *= chunksize;
+ result.rBottom() *= chunksize;
+ result.rRight() += chunksize;
+ result.rBottom() += chunksize;
+ }
+
+ return result;
+}
+
+/*!
+\internal
+Redraws the area \a inarea of the TQCanvas.
+*/
+void TQCanvas::drawChanges(const TQRect& inarea)
+{
+ TQRect area=inarea.intersect(TQRect(0,0,width(),height()));
+
+ TQCanvasClusterizer clusters(maxclusters);
+
+ int mx = (area.x()+area.width()+chunksize)/chunksize;
+ int my = (area.y()+area.height()+chunksize)/chunksize;
+ if (mx > chwidth)
+ mx=chwidth;
+ if (my > chheight)
+ my=chheight;
+
+ int x=area.x()/chunksize;
+ while( x<mx ) {
+ int y=area.y()/chunksize;
+ while( y<my ) {
+ TQCanvasChunk& ch=chunk(x,y);
+ if ( ch.hasChanged() )
+ clusters.add(x,y);
+ y++;
+ }
+ x++;
+ }
+
+ for (int i=0; i<clusters.clusters(); i++) {
+ TQRect elarea=clusters[i];
+ elarea.setRect(
+ elarea.left()*chunksize,
+ elarea.top()*chunksize,
+ elarea.width()*chunksize,
+ elarea.height()*chunksize
+ );
+ drawCanvasArea(elarea);
+ }
+}
+
+/*!
+ Paints all canvas items that are in the area \a clip to \a
+ painter, using double-buffering if \a dbuf is TRUE.
+
+ e.g. to print the canvas to a printer:
+ \code
+ TQPrinter pr;
+ if ( pr.setup() ) {
+ TQPainter p(&pr);
+ canvas.drawArea( canvas.rect(), &p );
+ }
+ \endcode
+*/
+void TQCanvas::drawArea(const TQRect& clip, TQPainter* painter, bool dbuf)
+{
+ if ( painter )
+ drawCanvasArea( clip, painter, dbuf );
+}
+
+/*!
+ \internal
+*/
+void TQCanvas::drawCanvasArea(const TQRect& inarea, TQPainter* p, bool double_buffer)
+{
+ TQRect area=inarea.intersect(TQRect(0,0,width(),height()));
+
+ if ( !dblbuf )
+ double_buffer = FALSE;
+
+ if (!d->viewList.first() && !p) return; // Nothing to do.
+
+ int lx=area.x()/chunksize;
+ int ly=area.y()/chunksize;
+ int mx=area.right()/chunksize;
+ int my=area.bottom()/chunksize;
+ if (mx>=chwidth)
+ mx=chwidth-1;
+ if (my>=chheight)
+ my=chheight-1;
+
+ TQCanvasItemList allvisible;
+
+ // Stores the region within area that need to be drawn. It is relative
+ // to area.topLeft() (so as to keep within bounds of 16-bit XRegions)
+ TQRegion rgn;
+
+ for (int x=lx; x<=mx; x++) {
+ for (int y=ly; y<=my; y++) {
+ // Only reset change if all views updating, and
+ // wholy within area. (conservative: ignore entire boundary)
+ //
+ // Disable this to help debugging.
+ //
+ if (!p) {
+ if ( chunk(x,y).takeChange() ) {
+ // ### should at least make bands
+ rgn |= TQRegion(x*chunksize-area.x(),y*chunksize-area.y(),
+ chunksize,chunksize);
+ allvisible += *chunk(x,y).listPtr();
+ }
+ } else {
+ allvisible += *chunk(x,y).listPtr();
+ }
+ }
+ }
+ allvisible.sort();
+
+ if ( double_buffer ) {
+ offscr = TQPixmap(area.size().expandedTo(TQSize(1, 1)));
+#ifdef TQ_WS_X11
+ if (p)
+ offscr.x11SetScreen(p->tqdevice()->x11Screen());
+#endif
+ }
+
+ if ( double_buffer && !offscr.isNull() ) {
+ TQPainter painter;
+ painter.begin(&offscr);
+ painter.translate(-area.x(),-area.y());
+ painter.setBrushOrigin(-area.x(),-area.y());
+ if ( p ) {
+ painter.setClipRect(TQRect(0,0,area.width(),area.height()));
+ } else {
+ painter.setClipRegion(rgn);
+ }
+ drawBackground(painter,area);
+ allvisible.drawUnique(painter);
+ drawForeground(painter,area);
+ painter.end();
+ if ( p ) {
+ p->drawPixmap( area.x(), area.y(), offscr,
+ 0, 0, area.width(), area.height() );
+ return;
+ }
+ } else if ( p ) {
+ drawBackground(*p,area);
+ allvisible.drawUnique(*p);
+ drawForeground(*p,area);
+ return;
+ }
+
+ TQPoint trtr; // keeps track of total translation of rgn
+
+ trtr -= area.topLeft();
+
+ for (TQCanvasView* view=d->viewList.first(); view; view=d->viewList.next()) {
+#ifndef TQT_NO_TRANSFORMATIONS
+ if ( !view->tqworldMatrix().isIdentity() )
+ continue; // Cannot paint those here (see callers).
+#endif
+ TQPainter painter(view->viewport());
+ TQPoint tr = view->contentsToViewport(area.topLeft());
+ TQPoint nrtr = view->contentsToViewport(TQPoint(0,0)); // new translation
+ TQPoint rtr = nrtr - trtr; // extra translation of rgn
+ trtr += rtr; // add to total
+ if (double_buffer) {
+ rgn.translate(rtr.x(),rtr.y());
+ painter.setClipRegion(rgn);
+ painter.drawPixmap(tr,offscr, TQRect(TQPoint(0,0),area.size()));
+ } else {
+ painter.translate(nrtr.x(),nrtr.y());
+ rgn.translate(rtr.x(),rtr.y());
+ painter.setClipRegion(rgn);
+ drawBackground(painter,area);
+ allvisible.drawUnique(painter);
+ drawForeground(painter,area);
+ painter.translate(-nrtr.x(),-nrtr.y());
+ }
+ }
+}
+
+/*!
+\internal
+This method to informs the TQCanvas that a given chunk is
+`dirty' and needs to be redrawn in the next Update.
+
+(\a x,\a y) is a chunk location.
+
+The sprite classes call this. Any new derived class of TQCanvasItem
+must do so too. SetChangedChunkContaining can be used instead.
+*/
+void TQCanvas::setChangedChunk(int x, int y)
+{
+ if (validChunk(x,y)) {
+ TQCanvasChunk& ch=chunk(x,y);
+ ch.change();
+ }
+}
+
+/*!
+\internal
+This method to informs the TQCanvas that the chunk containing a given
+pixel is `dirty' and needs to be redrawn in the next Update.
+
+(\a x,\a y) is a pixel location.
+
+The item classes call this. Any new derived class of TQCanvasItem must
+do so too. SetChangedChunk can be used instead.
+*/
+void TQCanvas::setChangedChunkContaining(int x, int y)
+{
+ if (x>=0 && x<width() && y>=0 && y<height()) {
+ TQCanvasChunk& chunk=chunkContaining(x,y);
+ chunk.change();
+ }
+}
+
+/*!
+\internal
+This method adds the TQCanvasItem \a g to the list of those which need to be
+drawn if the given chunk at location ( \a x, \a y ) is redrawn. Like
+SetChangedChunk and SetChangedChunkContaining, this method marks the
+chunk as `dirty'.
+*/
+void TQCanvas::addItemToChunk(TQCanvasItem* g, int x, int y)
+{
+ if (validChunk(x,y)) {
+ chunk(x,y).add(g);
+ }
+}
+
+/*!
+\internal
+This method removes the TQCanvasItem \a g from the list of those which need to
+be drawn if the given chunk at location ( \a x, \a y ) is redrawn. Like
+SetChangedChunk and SetChangedChunkContaining, this method marks the chunk
+as `dirty'.
+*/
+void TQCanvas::removeItemFromChunk(TQCanvasItem* g, int x, int y)
+{
+ if (validChunk(x,y)) {
+ chunk(x,y).remove(g);
+ }
+}
+
+
+/*!
+\internal
+This method adds the TQCanvasItem \a g to the list of those which need to be
+drawn if the chunk containing the given pixel ( \a x, \a y ) is redrawn. Like
+SetChangedChunk and SetChangedChunkContaining, this method marks the
+chunk as `dirty'.
+*/
+void TQCanvas::addItemToChunkContaining(TQCanvasItem* g, int x, int y)
+{
+ if (x>=0 && x<width() && y>=0 && y<height()) {
+ chunkContaining(x,y).add(g);
+ }
+}
+
+/*!
+\internal
+This method removes the TQCanvasItem \a g from the list of those which need to
+be drawn if the chunk containing the given pixel ( \a x, \a y ) is redrawn.
+Like SetChangedChunk and SetChangedChunkContaining, this method
+marks the chunk as `dirty'.
+*/
+void TQCanvas::removeItemFromChunkContaining(TQCanvasItem* g, int x, int y)
+{
+ if (x>=0 && x<width() && y>=0 && y<height()) {
+ chunkContaining(x,y).remove(g);
+ }
+}
+
+/*!
+ Returns the color set by setBackgroundColor(). By default, this is
+ white.
+
+ This function is not a reimplementation of
+ TQWidget::backgroundColor() (TQCanvas is not a subclass of TQWidget),
+ but all TQCanvasViews that are viewing the canvas will set their
+ backgrounds to this color.
+
+ \sa setBackgroundColor(), backgroundPixmap()
+*/
+TQColor TQCanvas::backgroundColor() const
+{
+ return bgcolor;
+}
+
+/*!
+ Sets the solid background to be the color \a c.
+
+ \sa backgroundColor(), setBackgroundPixmap(), setTiles()
+*/
+void TQCanvas::setBackgroundColor( const TQColor& c )
+{
+ if ( bgcolor != c ) {
+ bgcolor = c;
+ TQCanvasView* view=d->viewList.first();
+ while ( view != 0 ) {
+ /* XXX this doesn't look right. Shouldn't this
+ be more like setBackgroundPixmap? : Ian */
+ view->viewport()->setEraseColor( bgcolor );
+ view=d->viewList.next();
+ }
+ setAllChanged();
+ }
+}
+
+/*!
+ Returns the pixmap set by setBackgroundPixmap(). By default,
+ this is a null pixmap.
+
+ \sa setBackgroundPixmap(), backgroundColor()
+*/
+TQPixmap TQCanvas::backgroundPixmap() const
+{
+ return pm;
+}
+
+/*!
+ Sets the solid background to be the pixmap \a p repeated as
+ necessary to cover the entire canvas.
+
+ \sa backgroundPixmap(), setBackgroundColor(), setTiles()
+*/
+void TQCanvas::tqsetBackgroundPixmap( const TQPixmap& p )
+{
+ setTiles(p, 1, 1, p.width(), p.height());
+ TQCanvasView* view = d->viewList.first();
+ while ( view != 0 ) {
+ view->updateContents();
+ view = d->viewList.next();
+ }
+}
+
+/*!
+ This virtual function is called for all updates of the canvas. It
+ renders any background graphics using the painter \a painter, in
+ the area \a clip. If the canvas has a background pixmap or a tiled
+ background, that graphic is used, otherwise the canvas is cleared
+ using the background color.
+
+ If the graphics for an area change, you must explicitly call
+ setChanged(const TQRect&) for the result to be visible when
+ update() is next called.
+
+ \sa setBackgroundColor(), setBackgroundPixmap(), setTiles()
+*/
+void TQCanvas::drawBackground(TQPainter& painter, const TQRect& clip)
+{
+ if ( pm.isNull() ) {
+ painter.fillRect(clip,bgcolor);
+ } else if ( !grid ) {
+ for (int x=clip.x()/pm.width();
+ x<(clip.x()+clip.width()+pm.width()-1)/pm.width(); x++)
+ {
+ for (int y=clip.y()/pm.height();
+ y<(clip.y()+clip.height()+pm.height()-1)/pm.height(); y++)
+ {
+ painter.drawPixmap(x*pm.width(), y*pm.height(),pm);
+ }
+ }
+ } else {
+ const int x1 = clip.left()/tilew;
+ int x2 = clip.right()/tilew;
+ const int y1 = clip.top()/tileh;
+ int y2 = clip.bottom()/tileh;
+
+ const int roww = pm.width()/tilew;
+
+ for (int j=y1; j<=y2; j++) {
+ int jj = j%tilesVertically();
+ for (int i=x1; i<=x2; i++) {
+ int t = tile(i%tilesHorizontally(), jj);
+ int tx = t % roww;
+ int ty = t / roww;
+ painter.drawPixmap( i*tilew, j*tileh, pm,
+ tx*tilew, ty*tileh, tilew, tileh );
+ }
+ }
+ }
+}
+
+/*!
+ This virtual function is called for all updates of the canvas. It
+ renders any foreground graphics using the painter \a painter, in
+ the area \a clip.
+
+ If the graphics for an area change, you must explicitly call
+ setChanged(const TQRect&) for the result to be visible when
+ update() is next called.
+
+ The default is to draw nothing.
+*/
+void TQCanvas::drawForeground(TQPainter& painter, const TQRect& clip)
+{
+ if ( debug_redraw_areas ) {
+ painter.setPen(Qt::red);
+ painter.setBrush(TQt::NoBrush);
+ painter.drawRect(clip);
+ }
+}
+
+/*!
+ If \a y is TRUE (the default) double-buffering is switched on;
+ otherwise double-buffering is switched off.
+
+ Turning off double-buffering causes the redrawn areas to flicker a
+ little and also gives a (usually small) performance improvement.
+*/
+void TQCanvas::setDoubleBuffering(bool y)
+{
+ dblbuf = y;
+}
+
+
+/*!
+ Sets the TQCanvas to be composed of \a h tiles horizontally and \a
+ v tiles vertically. Each tile will be an image \a tilewidth by \a
+ tileheight pixels from pixmap \a p.
+
+ The pixmap \a p is a list of tiles, arranged left to right, (and
+ in the case of pixmaps that have multiple rows of tiles, top to
+ bottom), with tile 0 in the top-left corner, tile 1 next to the
+ right, and so on, e.g.
+
+ \table
+ \row \i 0 \i 1 \i 2 \i 3
+ \row \i 4 \i 5 \i 6 \i 7
+ \endtable
+
+ If the canvas is larger than the matrix of tiles, the entire
+ matrix is repeated as necessary to cover the whole canvas. If it
+ is smaller, tiles to the right and bottom are not visible.
+
+ The width and height of \a p must be a multiple of \a tilewidth
+ and \a tileheight. If they are not the function will do nothing.
+
+ If you want to unset any tiling set, then just pass in a null
+ pixmap and 0 for \a h, \a v, \a tilewidth, and
+ \a tileheight.
+*/
+void TQCanvas::setTiles( TQPixmap p,
+ int h, int v, int tilewidth, int tileheight )
+{
+ if ( !p.isNull() && (!tilewidth || !tileheight ||
+ p.width() % tilewidth != 0 || p.height() % tileheight != 0 ) )
+ return;
+
+ htiles = h;
+ vtiles = v;
+ delete[] grid;
+ pm = p;
+ if ( h && v && !p.isNull() ) {
+ grid = new ushort[h*v];
+ memset( grid, 0, h*v*sizeof(ushort) );
+ tilew = tilewidth;
+ tileh = tileheight;
+ } else {
+ grid = 0;
+ }
+ if ( h + v > 10 ) {
+ int s = scm(tilewidth,tileheight);
+ retune( s < 128 ? s : TQMAX(tilewidth,tileheight) );
+ }
+ setAllChanged();
+}
+
+/*!
+ \fn int TQCanvas::tile( int x, int y ) const
+
+ Returns the tile at position (\a x, \a y). Initially, all tiles
+ are 0.
+
+ The parameters must be within range, i.e.
+ 0 \< \a x \< tilesHorizontally() and
+ 0 \< \a y \< tilesVertically().
+
+ \sa setTile()
+*/
+
+/*!
+ \fn int TQCanvas::tilesHorizontally() const
+
+ Returns the number of tiles horizontally.
+*/
+
+/*!
+ \fn int TQCanvas::tilesVertically() const
+
+ Returns the number of tiles vertically.
+*/
+
+/*!
+ \fn int TQCanvas::tileWidth() const
+
+ Returns the width of each tile.
+*/
+
+/*!
+ \fn int TQCanvas::tileHeight() const
+
+ Returns the height of each tile.
+*/
+
+
+/*!
+ Sets the tile at (\a x, \a y) to use tile number \a tilenum, which
+ is an index into the tile pixmaps. The canvas will update
+ appropriately when update() is next called.
+
+ The images are taken from the pixmap set by setTiles() and are
+ arranged left to right, (and in the case of pixmaps that have
+ multiple rows of tiles, top to bottom), with tile 0 in the
+ top-left corner, tile 1 next to the right, and so on, e.g.
+
+ \table
+ \row \i 0 \i 1 \i 2 \i 3
+ \row \i 4 \i 5 \i 6 \i 7
+ \endtable
+
+ \sa tile() setTiles()
+*/
+void TQCanvas::setTile( int x, int y, int tilenum )
+{
+ ushort& t = grid[x+y*htiles];
+ if ( t != tilenum ) {
+ t = tilenum;
+ if ( tilew == tileh && tilew == chunksize )
+ setChangedChunk( x, y ); // common case
+ else
+ setChanged( TQRect(x*tilew,y*tileh,tilew,tileh) );
+ }
+}
+
+
+// lesser-used data in canvas item, plus room for extension.
+// Be careful adding to this - check all usages.
+class TQCanvasItemExtra {
+ TQCanvasItemExtra() : vx(0.0), vy(0.0) { }
+ double vx,vy;
+ friend class TQCanvasItem;
+};
+
+
+/*!
+ \class TQCanvasItem tqcanvas.h
+ \brief The TQCanvasItem class provides an abstract graphic object on a TQCanvas.
+\if defined(commercial)
+ It is part of the <a href="commercialeditions.html">TQt Enterprise Edition</a>.
+\endif
+
+ \module canvas
+ \ingroup graphics
+ \ingroup images
+
+ A variety of TQCanvasItem subclasses provide immediately usable
+ behaviour. This class is a pure abstract superclass providing the
+ behaviour that is shared among all the concrete canvas item classes.
+ TQCanvasItem is not intended for direct subclassing. It is much easier
+ to subclass one of its subclasses, e.g. TQCanvasPolygonalItem (the
+ commonest base class), TQCanvasRectangle, TQCanvasSprite, TQCanvasEllipse
+ or TQCanvasText.
+
+ Canvas items are added to a canvas by constructing them and passing the
+ canvas to the canvas item's constructor. An item can be moved to a
+ different canvas using setCanvas().
+
+ Items appear on the canvas after their \link show() show()\endlink
+ function has been called (or \link tqsetVisible()
+ tqsetVisible(TRUE)\endlink), and \e after update() has been called. The
+ canvas only shows items that are \link tqsetVisible() visible\endlink,
+ and then only if \l update() is called. If you created the canvas
+ without passing a width and height to the constructor you'll also need
+ to call \link TQCanvas::resize() resize()\endlink. Since the canvas
+ background defaults to white and canvas items default to white,
+ you may need to change colors to see your items.
+
+ A TQCanvasItem object can be moved in the x(), y() and z() dimensions
+ using functions such as move(), moveBy(), setX(), setY() and setZ(). A
+ canvas item can be set in motion, `animated', using setAnimated() and
+ given a velocity in the x and y directions with setXVelocity() and
+ setYVelocity() -- the same effect can be achieved by calling
+ setVelocity(). Use the collidesWith() function to see if the canvas item
+ will collide on the \e next advance(1) and use collisions() to see what
+ collisions have occurred.
+
+ Use TQCanvasSprite or your own subclass of TQCanvasSprite to create canvas
+ items which are animated, i.e. which change over time.
+
+ The size of a canvas item is given by boundingRect(). Use
+ boundingRectAdvanced() to see what the size of the canvas item will be
+ \e after the next advance(1) call.
+
+ The rtti() function is used for identifying subclasses of TQCanvasItem.
+ The canvas() function returns a pointer to the canvas which tqcontains the
+ canvas item.
+
+ TQCanvasItem provides the show() and isVisible() functions like those in
+ TQWidget.
+
+ TQCanvasItem also provides the setEnabled(), setActive() and
+ setSelected() functions; these functions set the relevant boolean and
+ cause a tqrepaint but the boolean values they set are not used in
+ TQCanvasItem itself. You can make use of these booleans in your subclasses.
+
+ By default, canvas items have no velocity, no size, and are not in
+ motion. The subclasses provided in TQt do not change these defaults
+ except where noted.
+
+*/
+
+/*!
+ \enum TQCanvasItem::RttiValues
+
+ This enum is used to name the different types of canvas item.
+
+ \value Rtti_Item Canvas item abstract base class
+ \value Rtti_Ellipse
+ \value Rtti_Line
+ \value Rtti_Polygon
+ \value Rtti_PolygonalItem
+ \value Rtti_Rectangle
+ \value Rtti_Spline
+ \value Rtti_Sprite
+ \value Rtti_Text
+
+*/
+
+/*!
+ \fn void TQCanvasItem::update()
+
+ Call this function to tqrepaint the canvas's changed chunks.
+*/
+
+/*!
+ Constructs a TQCanvasItem on canvas \a canvas.
+
+ \sa setCanvas()
+*/
+TQCanvasItem::TQCanvasItem(TQCanvas* canvas) :
+ cnv(canvas),
+ myx(0),myy(0),myz(0)
+{
+ ani=0;
+ vis=0;
+ val=0;
+ sel=0;
+ ena=0;
+ act=0;
+
+ ext = 0;
+ if (cnv) cnv->addItem(this);
+}
+
+/*!
+ Destroys the TQCanvasItem and removes it from its canvas.
+*/
+TQCanvasItem::~TQCanvasItem()
+{
+ if (cnv) {
+ cnv->removeItem(this);
+ cnv->removeAnimation(this);
+ }
+ delete ext;
+}
+
+TQCanvasItemExtra& TQCanvasItem::extra()
+{
+ if ( !ext )
+ ext = new TQCanvasItemExtra;
+ return *ext;
+}
+
+/*!
+ \fn double TQCanvasItem::x() const
+
+ Returns the horizontal position of the canvas item. Note that
+ subclasses often have an origin other than the top-left corner.
+*/
+
+/*!
+ \fn double TQCanvasItem::y() const
+
+ Returns the vertical position of the canvas item. Note that
+ subclasses often have an origin other than the top-left corner.
+*/
+
+/*!
+ \fn double TQCanvasItem::z() const
+
+ Returns the z index of the canvas item, which is used for visual
+ order: higher-z items obscure (are in front of) lower-z items.
+*/
+
+/*!
+ \fn void TQCanvasItem::setX(double x)
+
+ Moves the canvas item so that its x-position is \a x.
+
+ \sa x(), move()
+*/
+
+/*!
+ \fn void TQCanvasItem::setY(double y)
+
+ Moves the canvas item so that its y-position is \a y.
+
+ \sa y(), move()
+*/
+
+/*!
+ \fn void TQCanvasItem::setZ(double z)
+
+ Sets the z index of the canvas item to \a z. Higher-z items
+ obscure (are in front of) lower-z items.
+
+ \sa z(), move()
+*/
+
+
+/*!
+ Moves the canvas item relative to its current position by (\a dx,
+ \a dy).
+*/
+void TQCanvasItem::moveBy( double dx, double dy )
+{
+ if ( dx || dy ) {
+ removeFromChunks();
+ myx += dx;
+ myy += dy;
+ addToChunks();
+ }
+}
+
+
+/*!
+ Moves the canvas item to the absolute position (\a x, \a y).
+*/
+void TQCanvasItem::move( double x, double y )
+{
+ moveBy( x-myx, y-myy );
+}
+
+
+/*!
+ Returns TRUE if the canvas item is in motion; otherwise returns
+ FALSE.
+
+ \sa setVelocity(), setAnimated()
+*/
+bool TQCanvasItem::animated() const
+{
+ return (bool)ani;
+}
+
+/*!
+ Sets the canvas item to be in motion if \a y is TRUE, or not if \a
+ y is FALSE. The speed and direction of the motion is set with
+ setVelocity(), or with setXVelocity() and setYVelocity().
+
+ \sa advance(), TQCanvas::advance()
+*/
+void TQCanvasItem::setAnimated(bool y)
+{
+ if ( y != (bool)ani ) {
+ ani = (uint)y;
+ if ( y ) {
+ cnv->addAnimation(this);
+ } else {
+ cnv->removeAnimation(this);
+ }
+ }
+}
+
+/*!
+ \fn void TQCanvasItem::setXVelocity( double vx )
+
+ Sets the horizontal component of the canvas item's velocity to \a vx.
+
+ \sa setYVelocity() setVelocity()
+*/
+
+/*!
+ \fn void TQCanvasItem::setYVelocity( double vy )
+
+ Sets the vertical component of the canvas item's velocity to \a vy.
+
+ \sa setXVelocity() setVelocity()
+*/
+
+/*!
+ Sets the canvas item to be in motion, moving by \a vx and \a vy
+ pixels in the horizontal and vertical directions respectively.
+
+ \sa advance() setXVelocity() setYVelocity()
+*/
+void TQCanvasItem::setVelocity( double vx, double vy)
+{
+ if ( ext || vx!=0.0 || vy!=0.0 ) {
+ if ( !ani )
+ setAnimated(TRUE);
+ extra().vx = vx;
+ extra().vy = vy;
+ }
+}
+
+/*!
+ Returns the horizontal velocity component of the canvas item.
+*/
+double TQCanvasItem::xVelocity() const
+{
+ return ext ? ext->vx : 0;
+}
+
+/*!
+ Returns the vertical velocity component of the canvas item.
+*/
+double TQCanvasItem::yVelocity() const
+{
+ return ext ? ext->vy : 0;
+}
+
+/*!
+ The default implementation moves the canvas item, if it is
+ animated(), by the preset velocity if \a phase is 1, and does
+ nothing if \a phase is 0.
+
+ Note that if you reimplement this function, the reimplementation
+ must not change the canvas in any way, for example it must not add
+ or remove items.
+
+ \sa TQCanvas::advance() setVelocity()
+*/
+void TQCanvasItem::advance(int phase)
+{
+ if ( ext && phase==1 )
+ moveBy(ext->vx,ext->vy);
+}
+
+/*!
+ \fn void TQCanvasItem::draw(TQPainter& painter)
+
+ This abstract virtual function draws the canvas item using \a painter.
+
+ \warning When you reimplement this function, make sure that you
+ leave the painter in the same state as you found it. For example,
+ if you start by calling TQPainter::translate(50, 50), end your
+ code by calling TQPainter::translate(-50, -50). Be also aware that
+ the painter might already have some transformations set (i.e.,
+ don't call TQPainter::resetXForm() when you're done).
+*/
+
+/*!
+ Sets the TQCanvas upon which the canvas item is to be drawn to \a c.
+
+ \sa canvas()
+*/
+void TQCanvasItem::setCanvas(TQCanvas* c)
+{
+ bool v=isVisible();
+ tqsetVisible(FALSE);
+ if (cnv) {
+ if (ext)
+ cnv->removeAnimation(this);
+ cnv->removeItem(this);
+ }
+ cnv=c;
+ if (cnv) {
+ cnv->addItem(this);
+ if ( ext )
+ cnv->addAnimation(this);
+ }
+ tqsetVisible(v);
+}
+
+/*!
+ \fn TQCanvas* TQCanvasItem::canvas() const
+
+ Returns the canvas containing the canvas item.
+*/
+
+/*! Shorthand for tqsetVisible(TRUE). */
+void TQCanvasItem::show()
+{
+ tqsetVisible(TRUE);
+}
+
+/*! Shorthand for tqsetVisible(FALSE). */
+void TQCanvasItem::hide()
+{
+ tqsetVisible(FALSE);
+}
+
+/*!
+ Makes the canvas item visible if \a yes is TRUE, or invisible if
+ \a yes is FALSE. The change takes effect when TQCanvas::update() is
+ next called.
+*/
+void TQCanvasItem::tqsetVisible(bool yes)
+{
+ if ((bool)vis!=yes) {
+ if (yes) {
+ vis=(uint)yes;
+ addToChunks();
+ } else {
+ removeFromChunks();
+ vis=(uint)yes;
+ }
+ }
+}
+/*!
+ \obsolete
+ \fn bool TQCanvasItem::visible() const
+ Use isVisible() instead.
+*/
+
+/*!
+ \fn bool TQCanvasItem::isVisible() const
+
+ Returns TRUE if the canvas item is visible; otherwise returns
+ FALSE.
+
+ Note that in this context TRUE does \e not mean that the canvas
+ item is currently in a view, merely that if a view is showing the
+ area where the canvas item is positioned, and the item is not
+ obscured by items with higher z values, and the view is not
+ obscured by overlaying windows, it would be visible.
+
+ \sa tqsetVisible(), z()
+*/
+
+/*!
+ \obsolete
+ \fn bool TQCanvasItem::selected() const
+ Use isSelected() instead.
+*/
+
+/*!
+ \fn bool TQCanvasItem::isSelected() const
+
+ Returns TRUE if the canvas item is selected; otherwise returns FALSE.
+*/
+
+/*!
+ Sets the selected flag of the item to \a yes. If this changes the
+ item's selected state the item will be redrawn when
+ TQCanvas::update() is next called.
+
+ The TQCanvas, TQCanvasItem and the TQt-supplied TQCanvasItem
+ subclasses do not make use of this value. The setSelected()
+ function is supplied because many applications need it, but it is
+ up to you how you use the isSelected() value.
+*/
+void TQCanvasItem::setSelected(bool yes)
+{
+ if ((bool)sel!=yes) {
+ sel=(uint)yes;
+ changeChunks();
+ }
+}
+
+/*!
+ \obsolete
+ \fn bool TQCanvasItem::enabled() const
+ Use isEnabled() instead.
+*/
+
+/*!
+ \fn bool TQCanvasItem::isEnabled() const
+
+ Returns TRUE if the TQCanvasItem is enabled; otherwise returns FALSE.
+*/
+
+/*!
+ Sets the enabled flag of the item to \a yes. If this changes the
+ item's enabled state the item will be redrawn when
+ TQCanvas::update() is next called.
+
+ The TQCanvas, TQCanvasItem and the TQt-supplied TQCanvasItem
+ subclasses do not make use of this value. The setEnabled()
+ function is supplied because many applications need it, but it is
+ up to you how you use the isEnabled() value.
+*/
+void TQCanvasItem::setEnabled(bool yes)
+{
+ if (ena!=(uint)yes) {
+ ena=(uint)yes;
+ changeChunks();
+ }
+}
+
+/*!
+ \obsolete
+ \fn bool TQCanvasItem::active() const
+ Use isActive() instead.
+*/
+
+/*!
+ \fn bool TQCanvasItem::isActive() const
+
+ Returns TRUE if the TQCanvasItem is active; otherwise returns FALSE.
+*/
+
+/*!
+ Sets the active flag of the item to \a yes. If this changes the
+ item's active state the item will be redrawn when
+ TQCanvas::update() is next called.
+
+ The TQCanvas, TQCanvasItem and the TQt-supplied TQCanvasItem
+ subclasses do not make use of this value. The setActive() function
+ is supplied because many applications need it, but it is up to you
+ how you use the isActive() value.
+*/
+void TQCanvasItem::setActive(bool yes)
+{
+ if (act!=(uint)yes) {
+ act=(uint)yes;
+ changeChunks();
+ }
+}
+
+bool qt_testCollision(const TQCanvasSprite* s1, const TQCanvasSprite* s2)
+{
+ const TQImage* s2image = s2->imageAdvanced()->collision_mask;
+ TQRect s2area = s2->boundingRectAdvanced();
+
+ TQRect cyourarea(s2area.x(),s2area.y(),
+ s2area.width(),s2area.height());
+
+ TQImage* s1image=s1->imageAdvanced()->collision_mask;
+
+ TQRect s1area = s1->boundingRectAdvanced();
+
+ TQRect ourarea = s1area.intersect(cyourarea);
+
+ if ( ourarea.isEmpty() )
+ return FALSE;
+
+ int x2=ourarea.x()-cyourarea.x();
+ int y2=ourarea.y()-cyourarea.y();
+ int x1=ourarea.x()-s1area.x();
+ int y1=ourarea.y()-s1area.y();
+ int w=ourarea.width();
+ int h=ourarea.height();
+
+ if ( !s2image ) {
+ if ( !s1image )
+ return w>0 && h>0;
+ // swap everything around
+ int t;
+ t=x1; x1=x2; x2=t;
+ t=y1; x1=y2; y2=t;
+ s2image = s1image;
+ s1image = 0;
+ }
+
+ // s2image != 0
+
+ // A non-linear search may be more efficient.
+ // Perhaps spiralling out from the center, or a simpler
+ // vertical expansion from the centreline.
+
+ // We assume that sprite masks don't have
+ // different bit orders.
+ //
+ // TQ_ASSERT(s1image->bitOrder()==s2image->bitOrder());
+
+ if (s1image) {
+ if (s1image->bitOrder() == TQImage::LittleEndian) {
+ for (int j=0; j<h; j++) {
+ const uchar* ml = s1image->scanLine(y1+j);
+ const uchar* yl = s2image->scanLine(y2+j);
+ for (int i=0; i<w; i++) {
+ if (*(yl + ((x2+i) >> 3)) & (1 << ((x2+i) & 7))
+ && *(ml + ((x1+i) >> 3)) & (1 << ((x1+i) & 7)))
+ {
+ return TRUE;
+ }
+ }
+ }
+ } else {
+ for (int j=0; j<h; j++) {
+ const uchar* ml = s1image->scanLine(y1+j);
+ const uchar* yl = s2image->scanLine(y2+j);
+ for (int i=0; i<w; i++) {
+ if (*(yl + ((x2+i) >> 3)) & (1 << (7-((x2+i) & 7)))
+ && *(ml + ((x1+i) >> 3)) & (1 << (7-((x1+i) & 7))))
+ {
+ return TRUE;
+ }
+ }
+ }
+ }
+ } else {
+ if (s2image->bitOrder() == TQImage::LittleEndian) {
+ for (int j=0; j<h; j++) {
+ const uchar* yl = s2image->scanLine(y2+j);
+ for (int i=0; i<w; i++) {
+ if (*(yl + ((x2+i) >> 3)) & (1 << ((x2+i) & 7)))
+ {
+ return TRUE;
+ }
+ }
+ }
+ } else {
+ for (int j=0; j<h; j++) {
+ const uchar* yl = s2image->scanLine(y2+j);
+ for (int i=0; i<w; i++) {
+ if (*(yl + ((x2+i) >> 3)) & (1 << (7-((x2+i) & 7))))
+ {
+ return TRUE;
+ }
+ }
+ }
+ }
+ }
+
+ return FALSE;
+}
+
+static bool collision_double_dispatch( const TQCanvasSprite* s1,
+ const TQCanvasPolygonalItem* p1,
+ const TQCanvasRectangle* r1,
+ const TQCanvasEllipse* e1,
+ const TQCanvasText* t1,
+ const TQCanvasSprite* s2,
+ const TQCanvasPolygonalItem* p2,
+ const TQCanvasRectangle* r2,
+ const TQCanvasEllipse* e2,
+ const TQCanvasText* t2 )
+{
+ const TQCanvasItem* i1 = s1 ?
+ (const TQCanvasItem*)s1 : p1 ?
+ (const TQCanvasItem*)p1 : r1 ?
+ (const TQCanvasItem*)r1 : e1 ?
+ (const TQCanvasItem*)e1 : (const TQCanvasItem*)t1;
+ const TQCanvasItem* i2 = s2 ?
+ (const TQCanvasItem*)s2 : p2 ?
+ (const TQCanvasItem*)p2 : r2 ?
+ (const TQCanvasItem*)r2 : e2 ?
+ (const TQCanvasItem*)e2 : (const TQCanvasItem*)t2;
+
+ if ( s1 && s2 ) {
+ // a
+ return qt_testCollision(s1,s2);
+ } else if ( (r1 || t1 || s1) && (r2 || t2 || s2) ) {
+ // b
+ TQRect rc1 = i1->boundingRectAdvanced();
+ TQRect rc2 = i2->boundingRectAdvanced();
+ return rc1.intersects(rc2);
+ } else if ( e1 && e2
+ && e1->angleLength()>=360*16 && e2->angleLength()>=360*16
+ && e1->width()==e1->height()
+ && e2->width()==e2->height() ) {
+ // c
+ double xd = (e1->x()+e1->xVelocity())-(e2->x()+e1->xVelocity());
+ double yd = (e1->y()+e1->yVelocity())-(e2->y()+e1->yVelocity());
+ double rd = (e1->width()+e2->width())/2;
+ return xd*xd+yd*yd <= rd*rd;
+ } else if ( p1 && (p2 || s2 || t2) ) {
+ // d
+ TQPointArray pa1 = p1->areaPointsAdvanced();
+ TQPointArray pa2 = p2 ? p2->areaPointsAdvanced()
+ : TQPointArray(i2->boundingRectAdvanced());
+ bool col= !(TQRegion(pa1) & TQRegion(pa2,TRUE)).isEmpty();
+
+ return col;
+ } else {
+ return collision_double_dispatch(s2,p2,r2,e2,t2,
+ s1,p1,r1,e1,t1);
+ }
+}
+
+/*!
+ \fn bool TQCanvasItem::collidesWith( const TQCanvasItem* other ) const
+
+ Returns TRUE if the canvas item will collide with the \a other
+ item \e after they have moved by their current velocities;
+ otherwise returns FALSE.
+
+ \sa collisions()
+*/
+
+
+/*!
+ \class TQCanvasSprite tqcanvas.h
+ \brief The TQCanvasSprite class provides an animated canvas item on a TQCanvas.
+\if defined(commercial)
+ It is part of the <a href="commercialeditions.html">TQt Enterprise Edition</a>.
+\endif
+
+ \module canvas
+ \ingroup graphics
+ \ingroup images
+
+ A canvas sprite is an object which can contain any number of images
+ (referred to as frames), only one of which is current, i.e.
+ displayed, at any one time. The images can be passed in the
+ constructor or set or changed later with setSequence(). If you
+ subclass TQCanvasSprite you can change the frame that is displayed
+ periodically, e.g. whenever TQCanvasItem::advance(1) is called to
+ create the effect of animation.
+
+ The current frame can be set with setFrame() or with move(). The
+ number of frames available is given by frameCount(). The bounding
+ rectangle of the current frame is returned by boundingRect().
+
+ The current frame's image can be retrieved with image(); use
+ imageAdvanced() to retrieve the image for the frame that will be
+ shown after advance(1) is called. Use the image() overload passing
+ it an integer index to retrieve a particular image from the list of
+ frames.
+
+ Use width() and height() to retrieve the dimensions of the current
+ frame.
+
+ Use leftEdge() and rightEdge() to retrieve the current frame's
+ left-hand and right-hand x-coordinates respectively. Use
+ bottomEdge() and topEdge() to retrieve the current frame's bottom
+ and top y-coordinates respectively. These functions have an overload
+ which will accept an integer frame number to retrieve the
+ coordinates of a particular frame.
+
+ TQCanvasSprite draws very quickly, at the expense of memory.
+
+ The current frame's image can be drawn on a painter with draw().
+
+ Like any other canvas item, canvas sprites can be moved with
+ move() which sets the x and y coordinates and the frame number, as
+ well as with TQCanvasItem::move() and TQCanvasItem::moveBy(), or by
+ setting coordinates with TQCanvasItem::setX(), TQCanvasItem::setY()
+ and TQCanvasItem::setZ().
+
+*/
+
+
+/*!
+ \reimp
+*/
+bool TQCanvasSprite::collidesWith( const TQCanvasItem* i ) const
+{
+ return i->collidesWith(this,0,0,0,0);
+}
+
+/*!
+ Returns TRUE if the canvas item collides with any of the given
+ items; otherwise returns FALSE. The parameters, \a s, \a p, \a r,
+ \a e and \a t, are all the same object, this is just a type
+ resolution trick.
+*/
+bool TQCanvasSprite::collidesWith( const TQCanvasSprite* s,
+ const TQCanvasPolygonalItem* p,
+ const TQCanvasRectangle* r,
+ const TQCanvasEllipse* e,
+ const TQCanvasText* t ) const
+{
+ return collision_double_dispatch(s,p,r,e,t,this,0,0,0,0);
+}
+
+/*!
+ \reimp
+*/
+bool TQCanvasPolygonalItem::collidesWith( const TQCanvasItem* i ) const
+{
+ return i->collidesWith(0,this,0,0,0);
+}
+
+bool TQCanvasPolygonalItem::collidesWith( const TQCanvasSprite* s,
+ const TQCanvasPolygonalItem* p,
+ const TQCanvasRectangle* r,
+ const TQCanvasEllipse* e,
+ const TQCanvasText* t ) const
+{
+ return collision_double_dispatch(s,p,r,e,t,0,this,0,0,0);
+}
+
+/*!
+ \reimp
+*/
+bool TQCanvasRectangle::collidesWith( const TQCanvasItem* i ) const
+{
+ return i->collidesWith(0,this,this,0,0);
+}
+
+bool TQCanvasRectangle::collidesWith( const TQCanvasSprite* s,
+ const TQCanvasPolygonalItem* p,
+ const TQCanvasRectangle* r,
+ const TQCanvasEllipse* e,
+ const TQCanvasText* t ) const
+{
+ return collision_double_dispatch(s,p,r,e,t,0,this,this,0,0);
+}
+
+
+/*!
+ \reimp
+*/
+bool TQCanvasEllipse::collidesWith( const TQCanvasItem* i ) const
+{
+ return i->collidesWith(0,this,0,this,0);
+}
+
+bool TQCanvasEllipse::collidesWith( const TQCanvasSprite* s,
+ const TQCanvasPolygonalItem* p,
+ const TQCanvasRectangle* r,
+ const TQCanvasEllipse* e,
+ const TQCanvasText* t ) const
+{
+ return collision_double_dispatch(s,p,r,e,t,0,this,0,this,0);
+}
+
+/*!
+ \reimp
+*/
+bool TQCanvasText::collidesWith( const TQCanvasItem* i ) const
+{
+ return i->collidesWith(0,0,0,0,this);
+}
+
+bool TQCanvasText::collidesWith( const TQCanvasSprite* s,
+ const TQCanvasPolygonalItem* p,
+ const TQCanvasRectangle* r,
+ const TQCanvasEllipse* e,
+ const TQCanvasText* t ) const
+{
+ return collision_double_dispatch(s,p,r,e,t,0,0,0,0,this);
+}
+
+/*!
+ Returns the list of canvas items that this canvas item has
+ collided with.
+
+ A collision is generally defined as occurring when the pixels of
+ one item draw on the pixels of another item, but not all
+ subclasses are so precise. Also, since pixel-wise collision
+ detection can be slow, this function works in either exact or
+ inexact mode, according to the \a exact parameter.
+
+ If \a exact is TRUE, the canvas items returned have been
+ accurately tested for collision with the canvas item.
+
+ If \a exact is FALSE, the canvas items returned are \e near the
+ canvas item. You can test the canvas items returned using
+ collidesWith() if any are interesting collision candidates. By
+ using this approach, you can ignore some canvas items for which
+ collisions are not relevant.
+
+ The returned list is a list of TQCanvasItems, but often you will
+ need to cast the items to their subclass types. The safe way to do
+ this is to use rtti() before casting. This provides some of the
+ functionality of the standard C++ dynamic cast operation even on
+ compilers where dynamic casts are not available.
+
+ Note that a canvas item may be `on' a canvas, e.g. it was created
+ with the canvas as parameter, even though its coordinates place it
+ beyond the edge of the canvas's area. Collision detection only
+ works for canvas items which are wholly or partly within the
+ canvas's area.
+
+ Note that if items have a velocity (see \l setVelocity()), then
+ collision testing is done based on where the item \e will be when
+ it moves, not its current location. For example, a "ball" item
+ doesn't need to actually embed into a "wall" item before a
+ collision is detected. For items without velocity, plain
+ intersection is used.
+*/
+TQCanvasItemList TQCanvasItem::collisions(bool exact) const
+{
+ return canvas()->collisions(chunks(),this,exact);
+}
+
+/*!
+ Returns a list of canvas items that collide with the point \a p.
+ The list is ordered by z coordinates, from highest z coordinate
+ (front-most item) to lowest z coordinate (rear-most item).
+*/
+TQCanvasItemList TQCanvas::collisions(const TQPoint& p) const
+{
+ return collisions(TQRect(p,TQSize(1,1)));
+}
+
+/*!
+ \overload
+
+ Returns a list of items which collide with the rectangle \a r. The
+ list is ordered by z coordinates, from highest z coordinate
+ (front-most item) to lowest z coordinate (rear-most item).
+*/
+TQCanvasItemList TQCanvas::collisions(const TQRect& r) const
+{
+ TQCanvasRectangle i(r,(TQCanvas*)this);
+ i.setPen(Qt::NoPen);
+ i.show(); // doesn't actually show, since we destroy it
+ TQCanvasItemList l = i.collisions(TRUE);
+ l.sort();
+ return l;
+}
+
+/*!
+ \overload
+
+ Returns a list of canvas items which intersect with the chunks
+ listed in \a chunklist, excluding \a item. If \a exact is TRUE,
+ only those which actually \link TQCanvasItem::collidesWith()
+ collide with\endlink \a item are returned; otherwise canvas items
+ are included just for being in the chunks.
+
+ This is a utility function mainly used to implement the simpler
+ TQCanvasItem::collisions() function.
+*/
+TQCanvasItemList TQCanvas::collisions(const TQPointArray& chunklist,
+ const TQCanvasItem* item, bool exact) const
+{
+ TQPtrDict<void> seen;
+ TQCanvasItemList result;
+ for (int i=0; i<(int)chunklist.count(); i++) {
+ int x = chunklist[i].x();
+ int y = chunklist[i].y();
+ if ( validChunk(x,y) ) {
+ const TQCanvasItemList* l = chunk(x,y).listPtr();
+ for (TQCanvasItemList::ConstIterator it=l->begin(); it!=l->end(); ++it) {
+ TQCanvasItem *g=*it;
+ if ( g != item ) {
+ if ( !seen.tqfind(g) ) {
+ seen.tqreplace(g,(void*)1);
+ if ( !exact || item->collidesWith(g) )
+ result.append(g);
+ }
+ }
+ }
+ }
+ }
+ return result;
+}
+
+/*!
+ \internal
+ Adds the item to all the chunks it covers.
+*/
+void TQCanvasItem::addToChunks()
+{
+ if (isVisible() && canvas()) {
+ TQPointArray pa = chunks();
+ for (int i=0; i<(int)pa.count(); i++)
+ canvas()->addItemToChunk(this,pa[i].x(),pa[i].y());
+ val=(uint)TRUE;
+ }
+}
+
+/*!
+ \internal
+ Removes the item from all the chunks it covers.
+*/
+void TQCanvasItem::removeFromChunks()
+{
+ if (isVisible() && canvas()) {
+ TQPointArray pa = chunks();
+ for (int i=0; i<(int)pa.count(); i++)
+ canvas()->removeItemFromChunk(this,pa[i].x(),pa[i].y());
+ }
+}
+
+/*!
+ \internal
+ Sets all the chunks covered by the item to be refreshed with TQCanvas::update()
+ is next called.
+*/
+void TQCanvasItem::changeChunks()
+{
+ if (isVisible() && canvas()) {
+ if (!val)
+ addToChunks();
+ TQPointArray pa = chunks();
+ for (int i=0; i<(int)pa.count(); i++)
+ canvas()->setChangedChunk(pa[i].x(),pa[i].y());
+ }
+}
+
+/*!
+ \fn TQRect TQCanvasItem::boundingRect() const
+
+ Returns the bounding rectangle in pixels that the canvas item covers.
+
+ \sa boundingRectAdvanced()
+*/
+
+/*!
+ Returns the bounding rectangle of pixels that the canvas item \e
+ will cover after advance(1) is called.
+
+ \sa boundingRect()
+*/
+TQRect TQCanvasItem::boundingRectAdvanced() const
+{
+ int dx = int(x()+xVelocity())-int(x());
+ int dy = int(y()+yVelocity())-int(y());
+ TQRect r = boundingRect();
+ r.moveBy(dx,dy);
+ return r;
+}
+
+/*!
+ \class TQCanvasPixmap tqcanvas.h
+ \brief The TQCanvasPixmap class provides pixmaps for TQCanvasSprites.
+\if defined(commercial)
+ It is part of the <a href="commercialeditions.html">TQt Enterprise Edition</a>.
+\endif
+
+ \module canvas
+ \ingroup graphics
+ \ingroup images
+
+ If you want to show a single pixmap on a TQCanvas use a
+ TQCanvasSprite with just one pixmap.
+
+ When pixmaps are inserted into a TQCanvasPixmapArray they are held
+ as TQCanvasPixmaps. \l{TQCanvasSprite}s are used to show pixmaps on
+ \l{TQCanvas}es and hold their pixmaps in a TQCanvasPixmapArray. If
+ you retrieve a frame (pixmap) from a TQCanvasSprite it will be
+ returned as a TQCanvasPixmap.
+
+ The pixmap is a TQPixmap and can only be set in the constructor.
+ There are three different constructors, one taking a TQPixmap, one
+ a TQImage and one a file name that refers to a file in any
+ supported file format (see TQImageIO).
+
+ TQCanvasPixmap can have a hotspot which is defined in terms of an (x,
+ y) offset. When you create a TQCanvasPixmap from a PNG file or from
+ a TQImage that has a TQImage::offset(), the offset() is initialized
+ appropriately, otherwise the constructor leaves it at (0, 0). You
+ can set it later using setOffset(). When the TQCanvasPixmap is used
+ in a TQCanvasSprite, the offset position is the point at
+ TQCanvasItem::x() and TQCanvasItem::y(), not the top-left corner of
+ the pixmap.
+
+ Note that for TQCanvasPixmap objects created by a TQCanvasSprite, the
+ position of each TQCanvasPixmap object is set so that the hotspot
+ stays in the same position.
+
+ \sa TQCanvasPixmapArray TQCanvasItem TQCanvasSprite
+*/
+
+#ifndef TQT_NO_IMAGEIO
+
+/*!
+ Constructs a TQCanvasPixmap that uses the image stored in \a
+ datafilename.
+*/
+TQCanvasPixmap::TQCanvasPixmap(const TQString& datafilename)
+{
+ TQImage image(datafilename);
+ init(image);
+}
+
+#endif
+
+/*!
+ Constructs a TQCanvasPixmap from the image \a image.
+*/
+TQCanvasPixmap::TQCanvasPixmap(const TQImage& image)
+{
+ init(image);
+}
+/*!
+ Constructs a TQCanvasPixmap from the pixmap \a pm using the offset
+ \a offset.
+*/
+TQCanvasPixmap::TQCanvasPixmap(const TQPixmap& pm, const TQPoint& offset)
+{
+ init(pm,offset.x(),offset.y());
+}
+
+void TQCanvasPixmap::init(const TQImage& image)
+{
+ convertFromImage(image);
+ hotx = image.offset().x();
+ hoty = image.offset().y();
+#ifndef TQT_NO_IMAGE_DITHER_TO_1
+ if( image.hasAlphaBuffer() ) {
+ TQImage i = image.createAlphaMask();
+ collision_mask = new TQImage(i);
+ } else
+#endif
+ collision_mask = 0;
+}
+
+void TQCanvasPixmap::init(const TQPixmap& pixmap, int hx, int hy)
+{
+ (TQPixmap&)*this = pixmap;
+ hotx = hx;
+ hoty = hy;
+ if( pixmap.tqmask() ) {
+ TQImage i = tqmask()->convertToImage();
+ collision_mask = new TQImage(i);
+ } else
+ collision_mask = 0;
+}
+
+/*!
+ Destroys the pixmap.
+*/
+TQCanvasPixmap::~TQCanvasPixmap()
+{
+ delete collision_mask;
+}
+
+/*!
+ \fn int TQCanvasPixmap::offsetX() const
+
+ Returns the x-offset of the pixmap's hotspot.
+
+ \sa setOffset()
+*/
+
+/*!
+ \fn int TQCanvasPixmap::offsetY() const
+
+ Returns the y-offset of the pixmap's hotspot.
+
+ \sa setOffset()
+*/
+
+/*!
+ \fn void TQCanvasPixmap::setOffset(int x, int y)
+
+ Sets the offset of the pixmap's hotspot to (\a x, \a y).
+
+ \warning Do not call this function if any TQCanvasSprites are
+ currently showing this pixmap.
+*/
+
+/*!
+ \class TQCanvasPixmapArray tqcanvas.h
+ \brief The TQCanvasPixmapArray class provides an array of TQCanvasPixmaps.
+\if defined(commercial)
+ It is part of the <a href="commercialeditions.html">TQt Enterprise Edition</a>.
+\endif
+
+ \module canvas
+ \ingroup graphics
+ \ingroup images
+
+
+ This class is used by TQCanvasSprite to hold an array of pixmaps.
+ It is used to implement animated sprites, i.e. images that change
+ over time, with each pixmap in the array holding one frame.
+
+ Depending on the constructor you use you can load multiple pixmaps
+ into the array either from a directory (specifying a wildcard
+ pattern for the files), or from a list of TQPixmaps. You can also
+ read in a set of pixmaps after construction using readPixmaps().
+
+ Individual pixmaps can be set with setImage() and retrieved with
+ image(). The number of pixmaps in the array is returned by
+ count().
+
+ TQCanvasSprite uses an image's tqmask for collision detection. You
+ can change this by reading in a separate set of image masks using
+ readCollisionMasks().
+
+*/
+
+/*!
+ Constructs an invalid array (i.e. isValid() will return FALSE).
+ You must call readPixmaps() before being able to use this
+ TQCanvasPixmapArray.
+*/
+TQCanvasPixmapArray::TQCanvasPixmapArray()
+: framecount( 0 ), img( 0 )
+{
+}
+
+#ifndef TQT_NO_IMAGEIO
+/*!
+ Constructs a TQCanvasPixmapArray from files.
+
+ The \a fc parameter sets the number of frames to be loaded for
+ this image.
+
+ If \a fc is not 0, \a datafilenamepattern should contain "%1",
+ e.g. "foo%1.png". The actual filenames are formed by replacing the
+ %1 with four-digit integers from 0 to (fc - 1), e.g. foo0000.png,
+ foo0001.png, foo0002.png, etc.
+
+ If \a fc is 0, \a datafilenamepattern is asssumed to be a
+ filename, and the image contained in this file will be loaded as
+ the first (and only) frame.
+
+ If \a datafilenamepattern does not exist, is not readable, isn't
+ an image, or some other error occurs, the array ends up empty and
+ isValid() returns FALSE.
+*/
+
+TQCanvasPixmapArray::TQCanvasPixmapArray( const TQString& datafilenamepattern,
+ int fc )
+: framecount( 0 ), img( 0 )
+{
+ readPixmaps(datafilenamepattern,fc);
+}
+#endif
+
+/*!
+ \obsolete
+ Use TQCanvasPixmapArray::TQCanvasPixmapArray( TQValueList<TQPixmap>, TQPointArray )
+ instead.
+
+ Constructs a TQCanvasPixmapArray from the list of TQPixmaps \a
+ list. The \a hotspots list has to be of the same size as \a list.
+*/
+TQCanvasPixmapArray::TQCanvasPixmapArray(TQPtrList<TQPixmap> list, TQPtrList<TQPoint> hotspots) :
+ framecount(list.count()),
+ img(new TQCanvasPixmap*[list.count()])
+{
+ if (list.count() != hotspots.count()) {
+ qWarning("TQCanvasPixmapArray: lists have different lengths");
+ reset();
+ img = 0;
+ } else {
+ list.first();
+ hotspots.first();
+ for (int i=0; i<framecount; i++) {
+ img[i]=new TQCanvasPixmap(*list.current(), *hotspots.current());
+ list.next();
+ hotspots.next();
+ }
+ }
+}
+
+/*!
+ Constructs a TQCanvasPixmapArray from the list of TQPixmaps in the
+ \a list. Each pixmap will get a hotspot according to the \a
+ hotspots array. If no hotspots are specified, each one is set to
+ be at position (0, 0).
+
+ If an error occurs, isValid() will return FALSE.
+*/
+TQCanvasPixmapArray::TQCanvasPixmapArray(TQValueList<TQPixmap> list, TQPointArray hotspots) :
+ framecount((int)list.size()),
+ img(new TQCanvasPixmap*[list.size()])
+{
+ bool have_hotspots = ( hotspots.size() != 0 );
+ if (have_hotspots && list.count() != hotspots.count()) {
+ qWarning("TQCanvasPixmapArray: lists have different lengths");
+ reset();
+ img = 0;
+ } else {
+ TQValueList<TQPixmap>::iterator it;
+ it = list.begin();
+ for (int i=0; i<framecount; i++) {
+ TQPoint hs = have_hotspots ? hotspots[i] : TQPoint( 0, 0 );
+ img[i]=new TQCanvasPixmap( *it, hs );
+ ++it;
+ }
+ }
+}
+
+/*!
+ Destroys the pixmap array and all the pixmaps it tqcontains.
+*/
+TQCanvasPixmapArray::~TQCanvasPixmapArray()
+{
+ reset();
+}
+
+void TQCanvasPixmapArray::reset()
+{
+ for (int i=0; i<framecount; i++)
+ delete img[i];
+ delete [] img;
+ img = 0;
+ framecount = 0;
+}
+
+#ifndef TQT_NO_IMAGEIO
+/*!
+ Reads one or more pixmaps into the pixmap array.
+
+ If \a fc is not 0, \a filenamepattern should contain "%1", e.g.
+ "foo%1.png". The actual filenames are formed by replacing the %1
+ with four-digit integers from 0 to (fc - 1), e.g. foo0000.png,
+ foo0001.png, foo0002.png, etc.
+
+ If \a fc is 0, \a filenamepattern is asssumed to be a filename,
+ and the image contained in this file will be loaded as the first
+ (and only) frame.
+
+ If \a filenamepattern does not exist, is not readable, isn't an
+ image, or some other error occurs, this function will return
+ FALSE, and isValid() will return FALSE; otherwise this function
+ will return TRUE.
+
+ \sa isValid()
+*/
+bool TQCanvasPixmapArray::readPixmaps( const TQString& filenamepattern,
+ int fc)
+{
+ return readPixmaps(filenamepattern,fc,FALSE);
+}
+
+/*!
+ Reads new collision masks for the array.
+
+ By default, TQCanvasSprite uses the image tqmask of a sprite to
+ detect collisions. Use this function to set your own collision
+ image masks.
+
+ If count() is 1 \a filename must specify a real filename to read
+ the tqmask from. If count() is greater than 1, the \a filename must
+ contain a "%1" that will get tqreplaced by the number of the tqmask to
+ be loaded, just like TQCanvasPixmapArray::readPixmaps().
+
+ All collision masks must be 1-bit images or this function call
+ will fail.
+
+ If the file isn't readable, tqcontains the wrong number of images,
+ or there is some other error, this function will return FALSE, and
+ the array will be flagged as invalid; otherwise this function
+ returns TRUE.
+
+ \sa isValid()
+*/
+bool TQCanvasPixmapArray::readCollisionMasks(const TQString& filename)
+{
+ return readPixmaps(filename,framecount,TRUE);
+}
+
+
+bool TQCanvasPixmapArray::readPixmaps( const TQString& datafilenamepattern,
+ int fc, bool maskonly)
+{
+ if ( !maskonly ) {
+ reset();
+ framecount = fc;
+ if ( !framecount )
+ framecount=1;
+ img = new TQCanvasPixmap*[framecount];
+ }
+ if (!img)
+ return FALSE;
+ bool ok = TRUE;
+ bool arg = fc > 1;
+ if ( !arg )
+ framecount=1;
+ for (int i=0; i<framecount; i++) {
+ TQString r;
+ r.sprintf("%04d",i);
+ if ( maskonly ) {
+ if (!img[i]->collision_mask)
+ img[i]->collision_mask = new TQImage();
+ img[i]->collision_mask->load(
+ arg ? TQT_TQSTRING(datafilenamepattern.arg(r)) : datafilenamepattern);
+ ok = ok
+ && !img[i]->collision_mask->isNull()
+ && img[i]->collision_mask->depth()==1;
+ } else {
+ img[i]=new TQCanvasPixmap(
+ arg ? TQT_TQSTRING(datafilenamepattern.arg(r)) : datafilenamepattern);
+ ok = ok && !img[i]->isNull();
+ }
+ }
+ if ( !ok ) {
+ reset();
+ }
+ return ok;
+}
+#endif
+
+/*!
+ \obsolete
+
+ Use isValid() instead.
+
+ This returns FALSE if the array is valid, and TRUE if it is not.
+*/
+bool TQCanvasPixmapArray::operator!()
+{
+ return img==0;
+}
+
+/*!
+ Returns TRUE if the pixmap array is valid; otherwise returns
+ FALSE.
+*/
+bool TQCanvasPixmapArray::isValid() const
+{
+ return (img != 0);
+}
+
+/*!
+ \fn TQCanvasPixmap* TQCanvasPixmapArray::image(int i) const
+
+ Returns pixmap \a i in the array, if \a i is non-negative and less
+ than than count(), and returns an unspecified value otherwise.
+*/
+
+// ### wouldn't it be better to put empty TQCanvasPixmaps in there instead of
+// initializing the additional elements in the array to 0? Lars
+/*!
+ Replaces the pixmap at index \a i with pixmap \a p.
+
+ The array takes ownership of \a p and will delete \a p when the
+ array itself is deleted.
+
+ If \a i is beyond the end of the array the array is extended to at
+ least i+1 elements, with elements count() to i-1 being initialized
+ to 0.
+*/
+void TQCanvasPixmapArray::setImage(int i, TQCanvasPixmap* p)
+{
+ if ( i >= framecount ) {
+ TQCanvasPixmap** newimg = new TQCanvasPixmap*[i+1];
+ memcpy(newimg, img, sizeof( TQCanvasPixmap * )*framecount);
+ memset(newimg + framecount, 0, sizeof( TQCanvasPixmap * )*( i+1 - framecount ) );
+ framecount = i+1;
+ delete [] img;
+ img = newimg;
+ }
+ delete img[i]; img[i]=p;
+}
+
+/*!
+ \fn uint TQCanvasPixmapArray::count() const
+
+ Returns the number of pixmaps in the array.
+*/
+
+/*!
+ Returns the x-coordinate of the current left edge of the sprite.
+ (This may change as the sprite animates since different frames may
+ have different left edges.)
+
+ \sa rightEdge() bottomEdge() topEdge()
+*/
+int TQCanvasSprite::leftEdge() const
+{
+ return int(x()) - image()->hotx;
+}
+
+/*!
+ \overload
+
+ Returns what the x-coordinate of the left edge of the sprite would
+ be if the sprite (actually its hotspot) were moved to x-position
+ \a nx.
+
+ \sa rightEdge() bottomEdge() topEdge()
+*/
+int TQCanvasSprite::leftEdge(int nx) const
+{
+ return nx - image()->hotx;
+}
+
+/*!
+ Returns the y-coordinate of the top edge of the sprite. (This may
+ change as the sprite animates since different frames may have
+ different top edges.)
+
+ \sa leftEdge() rightEdge() bottomEdge()
+*/
+int TQCanvasSprite::topEdge() const
+{
+ return int(y()) - image()->hoty;
+}
+
+/*!
+ \overload
+
+ Returns what the y-coordinate of the top edge of the sprite would
+ be if the sprite (actually its hotspot) were moved to y-position
+ \a ny.
+
+ \sa leftEdge() rightEdge() bottomEdge()
+*/
+int TQCanvasSprite::topEdge(int ny) const
+{
+ return ny - image()->hoty;
+}
+
+/*!
+ Returns the x-coordinate of the current right edge of the sprite.
+ (This may change as the sprite animates since different frames may
+ have different right edges.)
+
+ \sa leftEdge() bottomEdge() topEdge()
+*/
+int TQCanvasSprite::rightEdge() const
+{
+ return leftEdge() + image()->width()-1;
+}
+
+/*!
+ \overload
+
+ Returns what the x-coordinate of the right edge of the sprite
+ would be if the sprite (actually its hotspot) were moved to
+ x-position \a nx.
+
+ \sa leftEdge() bottomEdge() topEdge()
+*/
+int TQCanvasSprite::rightEdge(int nx) const
+{
+ return leftEdge(nx) + image()->width()-1;
+}
+
+/*!
+ Returns the y-coordinate of the current bottom edge of the sprite.
+ (This may change as the sprite animates since different frames may
+ have different bottom edges.)
+
+ \sa leftEdge() rightEdge() topEdge()
+*/
+int TQCanvasSprite::bottomEdge() const
+{
+ return topEdge() + image()->height()-1;
+}
+
+/*!
+ \overload
+
+ Returns what the y-coordinate of the top edge of the sprite would
+ be if the sprite (actually its hotspot) were moved to y-position
+ \a ny.
+
+ \sa leftEdge() rightEdge() topEdge()
+*/
+int TQCanvasSprite::bottomEdge(int ny) const
+{
+ return topEdge(ny) + image()->height()-1;
+}
+
+/*!
+ \fn TQCanvasPixmap* TQCanvasSprite::image() const
+
+ Returns the current frame's image.
+
+ \sa frame(), setFrame()
+*/
+
+/*!
+ \fn TQCanvasPixmap* TQCanvasSprite::image(int f) const
+ \overload
+
+ Returns the image for frame \a f. Does not do any bounds checking on \a f.
+*/
+
+/*!
+ Returns the image the sprite \e will have after advance(1) is
+ called. By default this is the same as image().
+*/
+TQCanvasPixmap* TQCanvasSprite::imageAdvanced() const
+{
+ return image();
+}
+
+/*!
+ Returns the bounding rectangle for the image in the sprite's
+ current frame. This assumes that the images are tightly cropped
+ (i.e. do not have transtqparent pixels all along a side).
+*/
+TQRect TQCanvasSprite::boundingRect() const
+{
+ return TQRect(leftEdge(), topEdge(), width(), height());
+}
+
+
+/*!
+ \internal
+ Returns the chunks covered by the item.
+*/
+TQPointArray TQCanvasItem::chunks() const
+{
+ TQPointArray r;
+ int n=0;
+ TQRect br = boundingRect();
+ if (isVisible() && canvas()) {
+ int chunksize=canvas()->chunkSize();
+ br &= TQRect(0,0,canvas()->width(),canvas()->height());
+ if ( br.isValid() ) {
+ r.resize((br.width()/chunksize+2)*(br.height()/chunksize+2));
+ for (int j=br.top()/chunksize; j<=br.bottom()/chunksize; j++) {
+ for (int i=br.left()/chunksize; i<=br.right()/chunksize; i++) {
+ r[n++] = TQPoint(i,j);
+ }
+ }
+ }
+ }
+ r.resize(n);
+ return r;
+}
+
+
+/*!
+ \internal
+ Add the sprite to the chunks in its TQCanvas which it overlaps.
+*/
+void TQCanvasSprite::addToChunks()
+{
+ if (isVisible() && canvas()) {
+ int chunksize=canvas()->chunkSize();
+ for (int j=topEdge()/chunksize; j<=bottomEdge()/chunksize; j++) {
+ for (int i=leftEdge()/chunksize; i<=rightEdge()/chunksize; i++) {
+ canvas()->addItemToChunk(this,i,j);
+ }
+ }
+ }
+}
+
+/*!
+ \internal
+ Remove the sprite from the chunks in its TQCanvas which it overlaps.
+
+ \sa addToChunks()
+*/
+void TQCanvasSprite::removeFromChunks()
+{
+ if (isVisible() && canvas()) {
+ int chunksize=canvas()->chunkSize();
+ for (int j=topEdge()/chunksize; j<=bottomEdge()/chunksize; j++) {
+ for (int i=leftEdge()/chunksize; i<=rightEdge()/chunksize; i++) {
+ canvas()->removeItemFromChunk(this,i,j);
+ }
+ }
+ }
+}
+
+/*!
+ The width of the sprite for the current frame's image.
+
+ \sa frame()
+*/
+//### mark: Why don't we have width(int) and height(int) to be
+//consistent with leftEdge() and leftEdge(int)?
+int TQCanvasSprite::width() const
+{
+ return image()->width();
+}
+
+/*!
+ The height of the sprite for the current frame's image.
+
+ \sa frame()
+*/
+int TQCanvasSprite::height() const
+{
+ return image()->height();
+}
+
+
+/*!
+ Draws the current frame's image at the sprite's current position
+ on painter \a painter.
+*/
+void TQCanvasSprite::draw(TQPainter& painter)
+{
+ painter.drawPixmap(leftEdge(),topEdge(),*image());
+}
+
+/*!
+ \class TQCanvasView tqcanvas.h
+ \brief The TQCanvasView class provides an on-screen view of a TQCanvas.
+\if defined(commercial)
+ It is part of the <a href="commercialeditions.html">TQt Enterprise Edition</a>.
+\endif
+
+ \module canvas
+ \ingroup graphics
+ \ingroup images
+
+ A TQCanvasView is widget which provides a view of a TQCanvas.
+
+ If you want users to be able to interact with a canvas view,
+ subclass TQCanvasView. You might then reimplement
+ TQScrollView::contentsMousePressEvent(). For example, assuming no
+ transformation matrix is set:
+
+ \code
+ void MyCanvasView::contentsMousePressEvent( TQMouseEvent* e )
+ {
+ TQCanvasItemList l = canvas()->collisions(e->pos());
+ for (TQCanvasItemList::Iterator it=l.begin(); it!=l.end(); ++it) {
+ if ( (*it)->rtti() == TQCanvasRectangle::RTTI )
+ qDebug("A TQCanvasRectangle lies somewhere at this point");
+ }
+ }
+ \endcode
+
+ The canvas view shows canvas canvas(); this can be changed using
+ setCanvas().
+
+ A transformation matrix can be used to transform the view of the
+ canvas in various ways, for example, zooming in or out or rotating.
+ For example:
+
+ \code
+ TQWMatrix wm;
+ wm.scale( 2, 2 ); // Zooms in by 2 times
+ wm.rotate( 90 ); // Rotates 90 degrees counter clockwise
+ // around the origin.
+ wm.translate( 0, -canvas->height() );
+ // moves the canvas down so what was visible
+ // before is still visible.
+ myCanvasView->setWorldMatrix( wm );
+ \endcode
+
+ Use setWorldMatrix() to set the canvas view's world matrix: you must
+ ensure that the world matrix is invertible. The current world matrix
+ is retrievable with tqworldMatrix(), and its inversion is retrievable
+ with inverseWorldMatrix().
+
+ Example:
+
+ The following code tqfinds the part of the canvas that is visible in
+ this view, i.e. the bounding rectangle of the view in canvas coordinates.
+
+ \code
+ TQRect rc = TQRect( myCanvasView->contentsX(), myCanvasView->contentsY(),
+ myCanvasView->visibleWidth(), myCanvasView->visibleHeight() );
+ TQRect canvasRect = myCanvasView->inverseWorldMatrix().mapRect(rc);
+ \endcode
+
+ \sa TQWMatrix TQPainter::setWorldMatrix()
+
+*/
+
+/*!
+ Constructs a TQCanvasView with tqparent \a tqparent, and name \a name,
+ using the widget flags \a f. The canvas view is not associated
+ with a canvas, so you must to call setCanvas() to view a
+ canvas.
+*/
+TQCanvasView::TQCanvasView(TQWidget* tqparent, const char* name, WFlags f) :
+ TQScrollView(tqparent,name,(WFlags)(f|TQt::WResizeNoErase|TQt::WStaticContents))
+{
+ d = new TQCanvasViewData;
+ viewing = 0;
+ setCanvas(0);
+ connect(this,TQT_SIGNAL(contentsMoving(int,int)),this,TQT_SLOT(cMoving(int,int)));
+}
+
+/*!
+ \overload
+
+ Constructs a TQCanvasView which views canvas \a canvas, with tqparent
+ \a tqparent, and name \a name, using the widget flags \a f.
+*/
+TQCanvasView::TQCanvasView(TQCanvas* canvas, TQWidget* tqparent, const char* name, WFlags f) :
+ TQScrollView(tqparent,name,(WFlags)(f|TQt::WResizeNoErase|TQt::WStaticContents))
+{
+ d = new TQCanvasViewData;
+ viewing = 0;
+ setCanvas(canvas);
+
+ connect(this,TQT_SIGNAL(contentsMoving(int,int)),this,TQT_SLOT(cMoving(int,int)));
+}
+
+/*!
+ Destroys the canvas view. The associated canvas is \e not deleted.
+*/
+TQCanvasView::~TQCanvasView()
+{
+ delete d;
+ d = 0;
+ setCanvas(0);
+}
+
+/*!
+ \fn TQCanvas* TQCanvasView::canvas() const
+
+ Returns a pointer to the canvas which the TQCanvasView is currently
+ showing.
+*/
+
+
+/*!
+ Sets the canvas that the TQCanvasView is showing to the canvas \a
+ canvas.
+*/
+void TQCanvasView::setCanvas(TQCanvas* canvas)
+{
+ if (viewing) {
+ disconnect(viewing);
+ viewing->removeView(this);
+ }
+ viewing=canvas;
+ if (viewing) {
+ connect(viewing,TQT_SIGNAL(resized()), this, TQT_SLOT(updateContentsSize()));
+ viewing->addView(this);
+ }
+ if ( d ) // called by d'tor
+ updateContentsSize();
+}
+
+#ifndef TQT_NO_TRANSFORMATIONS
+/*!
+ Returns a reference to the canvas view's current transformation matrix.
+
+ \sa setWorldMatrix() inverseWorldMatrix()
+*/
+const TQWMatrix &TQCanvasView::tqworldMatrix() const
+{
+ return d->xform;
+}
+
+/*!
+ Returns a reference to the inverse of the canvas view's current
+ transformation matrix.
+
+ \sa setWorldMatrix() tqworldMatrix()
+*/
+const TQWMatrix &TQCanvasView::inverseWorldMatrix() const
+{
+ return d->ixform;
+}
+
+/*!
+ Sets the transformation matrix of the TQCanvasView to \a wm. The
+ matrix must be invertible (i.e. if you create a world matrix that
+ zooms out by 2 times, then the inverse of this matrix is one that
+ will zoom in by 2 times).
+
+ When you use this, you should note that the performance of the
+ TQCanvasView will decrease considerably.
+
+ Returns FALSE if \a wm is not invertable; otherwise returns TRUE.
+
+ \sa tqworldMatrix() inverseWorldMatrix() TQWMatrix::isInvertible()
+*/
+bool TQCanvasView::setWorldMatrix( const TQWMatrix & wm )
+{
+ bool ok = wm.isInvertible();
+ if ( ok ) {
+ d->xform = wm;
+ d->ixform = wm.invert();
+ updateContentsSize();
+ viewport()->update();
+ }
+ return ok;
+}
+#endif
+
+void TQCanvasView::updateContentsSize()
+{
+ if ( viewing ) {
+ TQRect br;
+#ifndef TQT_NO_TRANSFORMATIONS
+ br = d->xform.map(TQRect(0,0,viewing->width(),viewing->height()));
+#else
+ br = TQRect(0,0,viewing->width(),viewing->height());
+#endif
+
+ if ( br.width() < contentsWidth() ) {
+ TQRect r(contentsToViewport(TQPoint(br.width(),0)),
+ TQSize(contentsWidth()-br.width(),contentsHeight()));
+ viewport()->erase(r);
+ }
+ if ( br.height() < contentsHeight() ) {
+ TQRect r(contentsToViewport(TQPoint(0,br.height())),
+ TQSize(contentsWidth(),contentsHeight()-br.height()));
+ viewport()->erase(r);
+ }
+
+ resizeContents(br.width(),br.height());
+ } else {
+ viewport()->erase();
+ resizeContents(1,1);
+ }
+}
+
+void TQCanvasView::cMoving(int x, int y)
+{
+ // A little kludge to smooth up repaints when scrolling
+ int dx = x - contentsX();
+ int dy = y - contentsY();
+ d->repaint_from_moving = TQABS(dx) < width()/8 && TQABS(dy) < height()/8;
+}
+
+/*!
+ Repaints part of the TQCanvas that the canvas view is showing
+ starting at \a cx by \a cy, with a width of \a cw and a height of \a
+ ch using the painter \a p.
+
+ \warning When double buffering is enabled, drawContents() will
+ not respect the current settings of the painter when setting up
+ the painter for the double buffer (e.g., viewport() and
+ window()). Also, be aware that TQCanvas::update() bypasses
+ drawContents(), which means any reimplementation of
+ drawContents() is not called.
+
+ \sa TQCanvas::setDoubleBuffering()
+*/
+void TQCanvasView::drawContents(TQPainter *p, int cx, int cy, int cw, int ch)
+{
+ TQRect r(cx,cy,cw,ch);
+ if (viewing) {
+ //viewing->drawViewArea(this,p,r,TRUE);
+ viewing->drawViewArea(this,p,r,!d->repaint_from_moving);
+ d->repaint_from_moving = FALSE;
+ } else {
+ p->eraseRect(r);
+ }
+}
+
+/*!
+ \reimp
+ \internal
+
+ (Implemented to get rid of a compiler warning.)
+*/
+void TQCanvasView::drawContents( TQPainter * )
+{
+}
+
+/*!
+ Suggests a size sufficient to view the entire canvas.
+*/
+TQSize TQCanvasView::tqsizeHint() const
+{
+ if ( !canvas() )
+ return TQScrollView::tqsizeHint();
+ // should maybe take transformations into account
+ return ( canvas()->size() + 2 * TQSize(frameWidth(), frameWidth()) )
+ .boundedTo( 3 * TQApplication::desktop()->size() / 4 );
+}
+
+// ### TQt 4.0 customer request: operate on doubles rather than int.
+// ### I know, almost impossible due to the use of TQRegion etc.
+/*!
+ \class TQCanvasPolygonalItem tqcanvas.h
+ \brief The TQCanvasPolygonalItem class provides a polygonal canvas item
+ on a TQCanvas.
+\if defined(commercial)
+ It is part of the <a href="commercialeditions.html">TQt Enterprise Edition</a>.
+\endif
+
+ \module canvas
+ \ingroup graphics
+ \ingroup images
+
+ The mostly rectangular classes, such as TQCanvasSprite and
+ TQCanvasText, use the object's bounding rectangle for movement,
+ repainting and collision calculations. For most other items, the
+ bounding rectangle can be far too large -- a diagonal line being
+ the worst case, and there are many other cases which are also bad.
+ TQCanvasPolygonalItem provides polygon-based bounding rectangle
+ handling, etc., which is much faster for non-rectangular items.
+
+ Derived classes should try to define as small an area as possible
+ to maximize efficiency, but the polygon must \e definitely be
+ contained completely within the polygonal area. Calculating the
+ exact requirements is usually difficult, but if you allow a small
+ overestimate it can be easy and quick, while still getting almost
+ all of TQCanvasPolygonalItem's speed.
+
+ Note that all subclasses \e must call hide() in their destructor
+ since hide() needs to be able to access areaPoints().
+
+ Normally, TQCanvasPolygonalItem uses the odd-even algorithm for
+ determining whether an object intersects this object. You can
+ change this to the winding algorithm using setWinding().
+
+ The bounding rectangle is available using boundingRect(). The
+ points bounding the polygonal item are retrieved with
+ areaPoints(). Use areaPointsAdvanced() to retrieve the bounding
+ points the polygonal item \e will have after
+ TQCanvasItem::advance(1) has been called.
+
+ If the tqshape of the polygonal item is about to change while the
+ item is visible, call tqinvalidate() before updating with a
+ different result from \l areaPoints().
+
+ By default, TQCanvasPolygonalItem objects have a black pen and no
+ brush (the default TQPen and TQBrush constructors). You can change
+ this with setPen() and setBrush(), but note that some
+ TQCanvasPolygonalItem subclasses only use the brush, ignoring the
+ pen setting.
+
+ The polygonal item can be drawn on a painter with draw().
+ Subclasses must reimplement drawShape() to draw themselves.
+
+ Like any other canvas item polygonal items can be moved with
+ TQCanvasItem::move() and TQCanvasItem::moveBy(), or by setting coordinates
+ with TQCanvasItem::setX(), TQCanvasItem::setY() and TQCanvasItem::setZ().
+
+*/
+
+
+/*
+ Since most polygonal items don't have a pen, the default is
+ NoPen and a black brush.
+*/
+static const TQPen& defaultPolygonPen()
+{
+ static TQPen* dp=0;
+ if ( !dp )
+ dp = new TQPen;
+ return *dp;
+}
+
+static const TQBrush& defaultPolygonBrush()
+{
+ static TQBrush* db=0;
+ if ( !db )
+ db = new TQBrush;
+ return *db;
+}
+
+/*!
+ Constructs a TQCanvasPolygonalItem on the canvas \a canvas.
+*/
+TQCanvasPolygonalItem::TQCanvasPolygonalItem(TQCanvas* canvas) :
+ TQCanvasItem(canvas),
+ br(defaultPolygonBrush()),
+ pn(defaultPolygonPen())
+{
+ wind=0;
+}
+
+/*!
+ Note that all subclasses \e must call hide() in their destructor
+ since hide() needs to be able to access areaPoints().
+*/
+TQCanvasPolygonalItem::~TQCanvasPolygonalItem()
+{
+}
+
+/*!
+ Returns TRUE if the polygonal item uses the winding algorithm to
+ determine the "inside" of the polygon. Returns FALSE if it uses
+ the odd-even algorithm.
+
+ The default is to use the odd-even algorithm.
+
+ \sa setWinding()
+*/
+bool TQCanvasPolygonalItem::winding() const
+{
+ return wind;
+}
+
+/*!
+ If \a enable is TRUE, the polygonal item will use the winding
+ algorithm to determine the "inside" of the polygon; otherwise the
+ odd-even algorithm will be used.
+
+ The default is to use the odd-even algorithm.
+
+ \sa winding()
+*/
+void TQCanvasPolygonalItem::setWinding(bool enable)
+{
+ wind = enable;
+}
+
+/*!
+ Invalidates all information about the area covered by the canvas
+ item. The item will be updated automatically on the next call that
+ changes the item's status, for example, move() or update(). Call
+ this function if you are going to change the tqshape of the item (as
+ returned by areaPoints()) while the item is visible.
+*/
+void TQCanvasPolygonalItem::tqinvalidate()
+{
+ val = (uint)FALSE;
+ removeFromChunks();
+}
+
+/*!
+ \fn TQCanvasPolygonalItem::isValid() const
+
+ Returns TRUE if the polygonal item's area information has not been
+ invalidated; otherwise returns FALSE.
+
+ \sa tqinvalidate()
+*/
+
+/*!
+ Returns the points the polygonal item \e will have after
+ TQCanvasItem::advance(1) is called, i.e. what the points are when
+ advanced by the current xVelocity() and yVelocity().
+*/
+TQPointArray TQCanvasPolygonalItem::areaPointsAdvanced() const
+{
+ int dx = int(x()+xVelocity())-int(x());
+ int dy = int(y()+yVelocity())-int(y());
+ TQPointArray r = areaPoints();
+ r.detach(); // Explicit sharing is stupid.
+ if ( dx || dy )
+ r.translate(dx,dy);
+ return r;
+}
+
+//#define TQCANVAS_POLYGONS_DEBUG
+#ifdef TQCANVAS_POLYGONS_DEBUG
+static TQWidget* dbg_wid=0;
+static TQPainter* dbg_ptr=0;
+#endif
+
+class TQPolygonalProcessor {
+public:
+ TQPolygonalProcessor(TQCanvas* c, const TQPointArray& pa) :
+ canvas(c)
+ {
+ TQRect pixelbounds = pa.boundingRect();
+ int cs = canvas->chunkSize();
+ TQRect canvasbounds = pixelbounds.intersect(canvas->rect());
+ bounds.setLeft(canvasbounds.left()/cs);
+ bounds.setRight(canvasbounds.right()/cs);
+ bounds.setTop(canvasbounds.top()/cs);
+ bounds.setBottom(canvasbounds.bottom()/cs);
+ bitmap = TQImage(bounds.width() + 1, bounds.height(), 1, 2, TQImage::LittleEndian);
+ pnt = 0;
+ bitmap.fill(0);
+#ifdef TQCANVAS_POLYGONS_DEBUG
+ dbg_start();
+#endif
+ }
+
+ inline void add(int x, int y)
+ {
+ if ( pnt >= (int)result.size() ) {
+ result.resize(pnt*2+10);
+ }
+ result[pnt++] = TQPoint(x+bounds.x(),y+bounds.y());
+#ifdef TQCANVAS_POLYGONS_DEBUG
+ if ( dbg_ptr ) {
+ int cs = canvas->chunkSize();
+ TQRect r(x*cs+bounds.x()*cs,y*cs+bounds.y()*cs,cs-1,cs-1);
+ dbg_ptr->setPen(TQt::blue);
+ dbg_ptr->drawRect(r);
+ }
+#endif
+ }
+
+ inline void addBits(int x1, int x2, uchar newbits, int xo, int yo)
+ {
+ for (int i=x1; i<=x2; i++)
+ if ( newbits & (1<<i) )
+ add(xo+i,yo);
+ }
+
+#ifdef TQCANVAS_POLYGONS_DEBUG
+ void dbg_start()
+ {
+ if ( !dbg_wid ) {
+ dbg_wid = new TQWidget;
+ dbg_wid->resize(800,600);
+ dbg_wid->show();
+ dbg_ptr = new TQPainter(dbg_wid);
+ dbg_ptr->setBrush(TQt::NoBrush);
+ }
+ dbg_ptr->fillRect(dbg_wid->rect(),TQt::white);
+ }
+#endif
+
+ void doSpans(int n, TQPoint* pt, int* w)
+ {
+ int cs = canvas->chunkSize();
+ for (int j=0; j<n; j++) {
+ int y = pt[j].y()/cs-bounds.y();
+ if (y >= bitmap.height() || y < 0) continue;
+ uchar* l = bitmap.scanLine(y);
+ int x = pt[j].x();
+ int x1 = x/cs-bounds.x();
+ if (x1 > bounds.width()) continue;
+ x1 = TQMAX(0,x1);
+ int x2 = (x+w[j])/cs-bounds.x();
+ if (x2 < 0) continue;
+ x2 = TQMIN(bounds.width(), x2);
+ int x1q = x1/8;
+ int x1r = x1%8;
+ int x2q = x2/8;
+ int x2r = x2%8;
+#ifdef TQCANVAS_POLYGONS_DEBUG
+ if ( dbg_ptr ) dbg_ptr->setPen(TQt::yellow);
+#endif
+ if ( x1q == x2q ) {
+ uchar newbits = (~l[x1q]) & (((2<<(x2r-x1r))-1)<<x1r);
+ if ( newbits ) {
+#ifdef TQCANVAS_POLYGONS_DEBUG
+ if ( dbg_ptr ) dbg_ptr->setPen(TQt::darkGreen);
+#endif
+ addBits(x1r,x2r,newbits,x1q*8,y);
+ l[x1q] |= newbits;
+ }
+ } else {
+#ifdef TQCANVAS_POLYGONS_DEBUG
+ if ( dbg_ptr ) dbg_ptr->setPen(TQt::blue);
+#endif
+ uchar newbits1 = (~l[x1q]) & (0xff<<x1r);
+ if ( newbits1 ) {
+#ifdef TQCANVAS_POLYGONS_DEBUG
+ if ( dbg_ptr ) dbg_ptr->setPen(TQt::green);
+#endif
+ addBits(x1r,7,newbits1,x1q*8,y);
+ l[x1q] |= newbits1;
+ }
+ for (int i=x1q+1; i<x2q; i++) {
+ if ( l[i] != 0xff ) {
+ addBits(0,7,~l[i],i*8,y);
+ l[i]=0xff;
+ }
+ }
+ uchar newbits2 = (~l[x2q]) & (0xff>>(7-x2r));
+ if ( newbits2 ) {
+#ifdef TQCANVAS_POLYGONS_DEBUG
+ if ( dbg_ptr ) dbg_ptr->setPen(TQt::red);
+#endif
+ addBits(0,x2r,newbits2,x2q*8,y);
+ l[x2q] |= newbits2;
+ }
+ }
+#ifdef TQCANVAS_POLYGONS_DEBUG
+ if ( dbg_ptr ) {
+ dbg_ptr->drawLine(pt[j],pt[j]+TQPoint(w[j],0));
+ }
+#endif
+ }
+ result.resize(pnt);
+ }
+
+ int pnt;
+ TQPointArray result;
+ TQCanvas* canvas;
+ TQRect bounds;
+ TQImage bitmap;
+};
+
+
+TQPointArray TQCanvasPolygonalItem::chunks() const
+{
+ TQPointArray pa = areaPoints();
+
+ if ( !pa.size() ) {
+ pa.detach(); // Explicit sharing is stupid.
+ return pa;
+ }
+
+ TQPolygonalProcessor processor(canvas(),pa);
+
+ scanPolygon(pa, wind, processor);
+
+ return processor.result;
+}
+/*!
+ Simply calls TQCanvasItem::chunks().
+*/
+TQPointArray TQCanvasRectangle::chunks() const
+{
+ // No need to do a polygon scan!
+ return TQCanvasItem::chunks();
+}
+
+/*!
+ Returns the bounding rectangle of the polygonal item, based on
+ areaPoints().
+*/
+TQRect TQCanvasPolygonalItem::boundingRect() const
+{
+ return areaPoints().boundingRect();
+}
+
+/*!
+ Reimplemented from TQCanvasItem, this draws the polygonal item by
+ setting the pen and brush for the item on the painter \a p and
+ calling drawShape().
+*/
+void TQCanvasPolygonalItem::draw(TQPainter & p)
+{
+ p.setPen(pn);
+ p.setBrush(br);
+ drawShape(p);
+}
+
+/*!
+ \fn void TQCanvasPolygonalItem::drawShape(TQPainter & p)
+
+ Subclasses must reimplement this function to draw their tqshape. The
+ pen and brush of \a p are already set to pen() and brush() prior
+ to calling this function.
+
+ \warning When you reimplement this function, make sure that you
+ leave the painter in the same state as you found it. For example,
+ if you start by calling TQPainter::translate(50, 50), end your
+ code by calling TQPainter::translate(-50, -50). Be also aware that
+ the painter might already have some transformations set (i.e.,
+ don't call TQPainter::resetXForm() when you're done).
+
+ \sa draw()
+*/
+
+/*!
+ \fn TQPen TQCanvasPolygonalItem::pen() const
+
+ Returns the TQPen used to draw the outline of the item, if any.
+
+ \sa setPen()
+*/
+
+/*!
+ \fn TQBrush TQCanvasPolygonalItem::brush() const
+
+ Returns the TQBrush used to fill the item, if filled.
+
+ \sa setBrush()
+*/
+
+/*!
+ Sets the TQPen used when drawing the item to the pen \a p.
+ Note that many TQCanvasPolygonalItems do not use the pen value.
+
+ \sa setBrush(), pen(), drawShape()
+*/
+void TQCanvasPolygonalItem::setPen(TQPen p)
+{
+ if ( pn != p ) {
+ removeFromChunks();
+ pn = p;
+ addToChunks();
+ }
+}
+
+/*!
+ Sets the TQBrush used when drawing the polygonal item to the brush \a b.
+
+ \sa setPen(), brush(), drawShape()
+*/
+void TQCanvasPolygonalItem::setBrush(TQBrush b)
+{
+ if ( br != b) {
+ br = b;
+ changeChunks();
+ }
+}
+
+
+/*!
+ \class TQCanvasPolygon tqcanvas.h
+ \brief The TQCanvasPolygon class provides a polygon on a TQCanvas.
+\if defined(commercial)
+ It is part of the <a href="commercialeditions.html">TQt Enterprise Edition</a>.
+\endif
+
+ \module canvas
+ \ingroup graphics
+ \ingroup images
+
+ Paints a polygon with a TQBrush. The polygon's points can be set in
+ the constructor or set or changed later using setPoints(). Use
+ points() to retrieve the points, or areaPoints() to retrieve the
+ points relative to the canvas's origin.
+
+ The polygon can be drawn on a painter with drawShape().
+
+ Like any other canvas item polygons can be moved with
+ TQCanvasItem::move() and TQCanvasItem::moveBy(), or by setting
+ coordinates with TQCanvasItem::setX(), TQCanvasItem::setY() and
+ TQCanvasItem::setZ().
+
+ Note: TQCanvasPolygon does not use the pen.
+*/
+
+/*!
+ Constructs a point-less polygon on the canvas \a canvas. You
+ should call setPoints() before using it further.
+*/
+TQCanvasPolygon::TQCanvasPolygon(TQCanvas* canvas) :
+ TQCanvasPolygonalItem(canvas)
+{
+}
+
+/*!
+ Destroys the polygon.
+*/
+TQCanvasPolygon::~TQCanvasPolygon()
+{
+ hide();
+}
+
+/*!
+ Draws the polygon using the painter \a p.
+
+ Note that TQCanvasPolygon does not support an outline (the pen is
+ always NoPen).
+*/
+void TQCanvasPolygon::drawShape(TQPainter & p)
+{
+ // ### why can't we draw outlines? We could use drawPolyline for it. Lars
+ // ### see other message. Warwick
+
+ p.setPen(NoPen); // since TQRegion(TQPointArray) excludes outline :-( )-:
+ p.drawPolygon(poly);
+}
+
+/*!
+ Sets the points of the polygon to be \a pa. These points will have
+ their x and y coordinates automatically translated by x(), y() as
+ the polygon is moved.
+*/
+void TQCanvasPolygon::setPoints(TQPointArray pa)
+{
+ removeFromChunks();
+ poly = pa;
+ poly.detach(); // Explicit sharing is stupid.
+ poly.translate((int)x(),(int)y());
+ addToChunks();
+}
+
+/*!
+ \reimp
+*/
+void TQCanvasPolygon::moveBy(double dx, double dy)
+{
+ // Note: does NOT call TQCanvasPolygonalItem::moveBy(), since that
+ // only does half this work.
+ //
+ int idx = int(x()+dx)-int(x());
+ int idy = int(y()+dy)-int(y());
+ if ( idx || idy ) {
+ removeFromChunks();
+ poly.translate(idx,idy);
+ }
+ myx+=dx;
+ myy+=dy;
+ if ( idx || idy ) {
+ addToChunks();
+ }
+}
+
+/*!
+ \class TQCanvasSpline tqcanvas.h
+ \brief The TQCanvasSpline class provides multi-bezier splines on a TQCanvas.
+\if defined(commercial)
+ It is part of the <a href="commercialeditions.html">TQt Enterprise Edition</a>.
+\endif
+
+ \module canvas
+ \ingroup graphics
+ \ingroup images
+
+ A TQCanvasSpline is a sequence of 4-point bezier curves joined
+ together to make a curved tqshape.
+
+ You set the control points of the spline with setControlPoints().
+
+ If the bezier is closed(), then the first control point will be
+ re-used as the last control point. Therefore, a closed bezier must
+ have a multiple of 3 control points and an open bezier must have
+ one extra point.
+
+ The beziers are not necessarily joined "smoothly". To ensure this,
+ set control points appropriately (general reference texts about
+ beziers will explain this in detail).
+
+ Like any other canvas item splines can be moved with
+ TQCanvasItem::move() and TQCanvasItem::moveBy(), or by setting
+ coordinates with TQCanvasItem::setX(), TQCanvasItem::setY() and
+ TQCanvasItem::setZ().
+
+*/
+
+/*!
+ Create a spline with no control points on the canvas \a canvas.
+
+ \sa setControlPoints()
+*/
+TQCanvasSpline::TQCanvasSpline(TQCanvas* canvas) :
+ TQCanvasPolygon(canvas),
+ cl(TRUE)
+{
+}
+
+/*!
+ Destroy the spline.
+*/
+TQCanvasSpline::~TQCanvasSpline()
+{
+}
+
+// ### shouldn't we handle errors more gracefully than with an assert? Lars
+// ### no, since it's a programming error. Warwick
+/*!
+ Set the spline control points to \a ctrl.
+
+ If \a close is TRUE, then the first point in \a ctrl will be
+ re-used as the last point, and the number of control points must
+ be a multiple of 3. If \a close is FALSE, one additional control
+ point is required, and the number of control points must be one of
+ (4, 7, 10, 13, ...).
+
+ If the number of control points doesn't meet the above conditions,
+ the number of points will be truncated to the largest number of
+ points that do meet the requirement.
+*/
+void TQCanvasSpline::setControlPoints(TQPointArray ctrl, bool close)
+{
+ if ( (int)ctrl.count() % 3 != (close ? 0 : 1) ) {
+ qWarning( "TQCanvasSpline::setControlPoints(): Number of points doesn't fit." );
+ int numCurves = (ctrl.count() - (close ? 0 : 1 ))/ 3;
+ ctrl.resize( numCurves*3 + ( close ? 0 : 1 ) );
+ }
+
+ cl = close;
+ bez = ctrl;
+ recalcPoly();
+}
+
+/*!
+ Returns the current set of control points.
+
+ \sa setControlPoints(), closed()
+*/
+TQPointArray TQCanvasSpline::controlPoints() const
+{
+ return bez;
+}
+
+/*!
+ Returns TRUE if the control points are a closed set; otherwise
+ returns FALSE.
+*/
+bool TQCanvasSpline::closed() const
+{
+ return cl;
+}
+
+void TQCanvasSpline::recalcPoly()
+{
+ TQPtrList<TQPointArray> segs;
+ segs.setAutoDelete(TRUE);
+ int n=0;
+ for (int i=0; i<(int)bez.count()-1; i+=3) {
+ TQPointArray ctrl(4);
+ ctrl[0] = bez[i+0];
+ ctrl[1] = bez[i+1];
+ ctrl[2] = bez[i+2];
+ if ( cl )
+ ctrl[3] = bez[(i+3)%(int)bez.count()];
+ else
+ ctrl[3] = bez[i+3];
+ TQPointArray *seg = new TQPointArray(ctrl.cubicBezier());
+ n += seg->count()-1;
+ segs.append(seg);
+ }
+ TQPointArray p(n+1);
+ n=0;
+ for (TQPointArray* seg = segs.first(); seg; seg = segs.next()) {
+ for (int i=0; i<(int)seg->count()-1; i++)
+ p[n++] = seg->point(i);
+ if ( n == (int)p.count()-1 )
+ p[n] = seg->point(seg->count()-1);
+ }
+ TQCanvasPolygon::setPoints(p);
+}
+
+/*!
+ \fn TQPointArray TQCanvasPolygonalItem::areaPoints() const
+
+ This function must be reimplemented by subclasses. It \e must
+ return the points bounding (i.e. outside and not touching) the
+ tqshape or drawing errors will occur.
+*/
+
+/*!
+ \fn TQPointArray TQCanvasPolygon::points() const
+
+ Returns the vertices of the polygon, not translated by the position.
+
+ \sa setPoints(), areaPoints()
+*/
+TQPointArray TQCanvasPolygon::points() const
+{
+ TQPointArray pa = areaPoints();
+ pa.translate(int(-x()),int(-y()));
+ return pa;
+}
+
+/*!
+ Returns the vertices of the polygon translated by the polygon's
+ current x(), y() position, i.e. relative to the canvas's origin.
+
+ \sa setPoints(), points()
+*/
+TQPointArray TQCanvasPolygon::areaPoints() const
+{
+ return poly.copy();
+}
+
+// ### mark: Why don't we offer a constructor that lets the user set the
+// points -- that way for some uses just the constructor call would be
+// required?
+/*!
+ \class TQCanvasLine tqcanvas.h
+ \brief The TQCanvasLine class provides a line on a TQCanvas.
+\if defined(commercial)
+ It is part of the <a href="commercialeditions.html">TQt Enterprise Edition</a>.
+\endif
+
+ \module canvas
+ \ingroup graphics
+ \ingroup images
+
+ The line inherits functionality from TQCanvasPolygonalItem, for
+ example the setPen() function. The start and end points of the
+ line are set with setPoints().
+
+ Like any other canvas item lines can be moved with
+ TQCanvasItem::move() and TQCanvasItem::moveBy(), or by setting
+ coordinates with TQCanvasItem::setX(), TQCanvasItem::setY() and
+ TQCanvasItem::setZ().
+*/
+
+/*!
+ Constructs a line from (0,0) to (0,0) on \a canvas.
+
+ \sa setPoints().
+*/
+TQCanvasLine::TQCanvasLine(TQCanvas* canvas) :
+ TQCanvasPolygonalItem(canvas)
+{
+ x1 = y1 = x2 = y2 = 0;
+}
+
+/*!
+ Destroys the line.
+*/
+TQCanvasLine::~TQCanvasLine()
+{
+ hide();
+}
+
+/*!
+ \reimp
+*/
+void TQCanvasLine::setPen(TQPen p)
+{
+ TQCanvasPolygonalItem::setPen(p);
+}
+
+/*!
+ \fn TQPoint TQCanvasLine::startPoint () const
+
+ Returns the start point of the line.
+
+ \sa setPoints(), endPoint()
+*/
+
+/*!
+ \fn TQPoint TQCanvasLine::endPoint () const
+
+ Returns the end point of the line.
+
+ \sa setPoints(), startPoint()
+*/
+
+/*!
+ Sets the line's start point to (\a xa, \a ya) and its end point to
+ (\a xb, \a yb).
+*/
+void TQCanvasLine::setPoints(int xa, int ya, int xb, int yb)
+{
+ if ( x1 != xa || x2 != xb || y1 != ya || y2 != yb ) {
+ removeFromChunks();
+ x1 = xa;
+ y1 = ya;
+ x2 = xb;
+ y2 = yb;
+ addToChunks();
+ }
+}
+
+/*!
+ \reimp
+*/
+void TQCanvasLine::drawShape(TQPainter &p)
+{
+ p.drawLine((int)(x()+x1), (int)(y()+y1), (int)(x()+x2), (int)(y()+y2));
+}
+
+/*!
+ \reimp
+
+ Note that the area defined by the line is somewhat thicker than
+ the line that is actually drawn.
+*/
+TQPointArray TQCanvasLine::areaPoints() const
+{
+ TQPointArray p(4);
+ int xi = int(x());
+ int yi = int(y());
+ int pw = pen().width();
+ int dx = TQABS(x1-x2);
+ int dy = TQABS(y1-y2);
+ pw = pw*4/3+2; // approx pw*sqrt(2)
+ int px = x1<x2 ? -pw : pw ;
+ int py = y1<y2 ? -pw : pw ;
+ if ( dx && dy && (dx > dy ? (dx*2/dy <= 2) : (dy*2/dx <= 2)) ) {
+ // steep
+ if ( px == py ) {
+ p[0] = TQPoint(x1+xi ,y1+yi+py);
+ p[1] = TQPoint(x2+xi-px,y2+yi );
+ p[2] = TQPoint(x2+xi ,y2+yi-py);
+ p[3] = TQPoint(x1+xi+px,y1+yi );
+ } else {
+ p[0] = TQPoint(x1+xi+px,y1+yi );
+ p[1] = TQPoint(x2+xi ,y2+yi-py);
+ p[2] = TQPoint(x2+xi-px,y2+yi );
+ p[3] = TQPoint(x1+xi ,y1+yi+py);
+ }
+ } else if ( dx > dy ) {
+ // horizontal
+ p[0] = TQPoint(x1+xi+px,y1+yi+py);
+ p[1] = TQPoint(x2+xi-px,y2+yi+py);
+ p[2] = TQPoint(x2+xi-px,y2+yi-py);
+ p[3] = TQPoint(x1+xi+px,y1+yi-py);
+ } else {
+ // vertical
+ p[0] = TQPoint(x1+xi+px,y1+yi+py);
+ p[1] = TQPoint(x2+xi+px,y2+yi-py);
+ p[2] = TQPoint(x2+xi-px,y2+yi-py);
+ p[3] = TQPoint(x1+xi-px,y1+yi+py);
+ }
+ return p;
+}
+
+/*!
+ \reimp
+
+*/
+
+void TQCanvasLine::moveBy(double dx, double dy)
+{
+ TQCanvasPolygonalItem::moveBy(dx, dy);
+}
+
+/*!
+ \class TQCanvasRectangle tqcanvas.h
+ \brief The TQCanvasRectangle class provides a rectangle on a TQCanvas.
+\if defined(commercial)
+ It is part of the <a href="commercialeditions.html">TQt Enterprise Edition</a>.
+\endif
+
+ \module canvas
+ \ingroup graphics
+ \ingroup images
+
+ This item paints a single rectangle which may have any pen() and
+ brush(), but may not be tilted/rotated. For rotated rectangles,
+ use TQCanvasPolygon.
+
+ The rectangle's size and initial position can be set in the
+ constructor. The size can be set or changed later using setSize().
+ Use height() and width() to retrieve the rectangle's dimensions.
+
+ The rectangle can be drawn on a painter with drawShape().
+
+ Like any other canvas item rectangles can be moved with
+ TQCanvasItem::move() and TQCanvasItem::moveBy(), or by setting
+ coordinates with TQCanvasItem::setX(), TQCanvasItem::setY() and
+ TQCanvasItem::setZ().
+
+*/
+
+/*!
+ Constructs a rectangle at position (0,0) with both width and
+ height set to 32 pixels on \a canvas.
+*/
+TQCanvasRectangle::TQCanvasRectangle(TQCanvas* canvas) :
+ TQCanvasPolygonalItem(canvas),
+ w(32), h(32)
+{
+}
+
+/*!
+ Constructs a rectangle positioned and sized by \a r on \a canvas.
+*/
+TQCanvasRectangle::TQCanvasRectangle(const TQRect& r, TQCanvas* canvas) :
+ TQCanvasPolygonalItem(canvas),
+ w(r.width()), h(r.height())
+{
+ move(r.x(),r.y());
+}
+
+/*!
+ Constructs a rectangle at position (\a x, \a y) and size \a width
+ by \a height, on \a canvas.
+*/
+TQCanvasRectangle::TQCanvasRectangle(int x, int y, int width, int height,
+ TQCanvas* canvas) :
+ TQCanvasPolygonalItem(canvas),
+ w(width), h(height)
+{
+ move(x,y);
+}
+
+/*!
+ Destroys the rectangle.
+*/
+TQCanvasRectangle::~TQCanvasRectangle()
+{
+ hide();
+}
+
+
+/*!
+ Returns the width of the rectangle.
+*/
+int TQCanvasRectangle::width() const
+{
+ return w;
+}
+
+/*!
+ Returns the height of the rectangle.
+*/
+int TQCanvasRectangle::height() const
+{
+ return h;
+}
+
+/*!
+ Sets the \a width and \a height of the rectangle.
+*/
+void TQCanvasRectangle::setSize(int width, int height)
+{
+ if ( w != width || h != height ) {
+ removeFromChunks();
+ w = width;
+ h = height;
+ addToChunks();
+ }
+}
+
+/*!
+ \fn TQSize TQCanvasRectangle::size() const
+
+ Returns the width() and height() of the rectangle.
+
+ \sa rect(), setSize()
+*/
+
+/*!
+ \fn TQRect TQCanvasRectangle::rect() const
+
+ Returns the integer-converted x(), y() position and size() of the
+ rectangle as a TQRect.
+*/
+
+/*!
+ \reimp
+*/
+TQPointArray TQCanvasRectangle::areaPoints() const
+{
+ TQPointArray pa(4);
+ int pw = (pen().width()+1)/2;
+ if ( pw < 1 ) pw = 1;
+ if ( pen() == Qt::NoPen ) pw = 0;
+ pa[0] = TQPoint((int)x()-pw,(int)y()-pw);
+ pa[1] = pa[0] + TQPoint(w+pw*2,0);
+ pa[2] = pa[1] + TQPoint(0,h+pw*2);
+ pa[3] = pa[0] + TQPoint(0,h+pw*2);
+ return pa;
+}
+
+/*!
+ Draws the rectangle on painter \a p.
+*/
+void TQCanvasRectangle::drawShape(TQPainter & p)
+{
+ p.drawRect((int)x(), (int)y(), w, h);
+}
+
+
+/*!
+ \class TQCanvasEllipse tqcanvas.h
+ \brief The TQCanvasEllipse class provides an ellipse or ellipse segment on a TQCanvas.
+\if defined(commercial)
+ It is part of the <a href="commercialeditions.html">TQt Enterprise Edition</a>.
+\endif
+
+ \module canvas
+ \ingroup graphics
+ \ingroup images
+
+ A canvas item that paints an ellipse or ellipse segment with a TQBrush.
+ The ellipse's height, width, start angle and angle length can be set
+ at construction time. The size can be changed at runtime with
+ setSize(), and the angles can be changed (if you're displaying an
+ ellipse segment rather than a whole ellipse) with setAngles().
+
+ Note that angles are specified in 16ths of a degree.
+
+ \target anglediagram
+ \img qcanvasellipse.png Ellipse
+
+ If a start angle and length angle are set then an ellipse segment
+ will be drawn. The start angle is the angle that goes from zero in a
+ counter-clockwise direction (shown in green in the diagram). The
+ length angle is the angle from the start angle in a
+ counter-clockwise direction (shown in blue in the diagram). The blue
+ segment is the segment of the ellipse that would be drawn. If no
+ start angle and length angle are specified the entire ellipse is
+ drawn.
+
+ The ellipse can be drawn on a painter with drawShape().
+
+ Like any other canvas item ellipses can be moved with move() and
+ moveBy(), or by setting coordinates with setX(), setY() and setZ().
+
+ Note: TQCanvasEllipse does not use the pen.
+*/
+
+/*!
+ Constructs a 32x32 ellipse, centered at (0, 0) on \a canvas.
+*/
+TQCanvasEllipse::TQCanvasEllipse(TQCanvas* canvas) :
+ TQCanvasPolygonalItem(canvas),
+ w(32), h(32),
+ a1(0), a2(360*16)
+{
+}
+
+/*!
+ Constructs a \a width by \a height pixel ellipse, centered at
+ (0, 0) on \a canvas.
+*/
+TQCanvasEllipse::TQCanvasEllipse(int width, int height, TQCanvas* canvas) :
+ TQCanvasPolygonalItem(canvas),
+ w(width),h(height),
+ a1(0),a2(360*16)
+{
+}
+
+// ### add a constructor taking degrees in float. 1/16 degrees is stupid. Lars
+// ### it's how TQPainter does it, so TQCanvas does too for consistency. If it's
+// ### a good idea, it should be added to TQPainter, not just to TQCanvas. Warwick
+/*!
+ Constructs a \a width by \a height pixel ellipse, centered at
+ (0, 0) on \a canvas. Only a segment of the ellipse is drawn,
+ starting at angle \a startangle, and extending for angle \a angle
+ (the angle length).
+
+ Note that angles are specified in
+ <small><sup>1</sup>/<sub>16</sub></small>ths of a degree.
+*/
+TQCanvasEllipse::TQCanvasEllipse(int width, int height,
+ int startangle, int angle, TQCanvas* canvas) :
+ TQCanvasPolygonalItem(canvas),
+ w(width),h(height),
+ a1(startangle),a2(angle)
+{
+}
+
+/*!
+ Destroys the ellipse.
+*/
+TQCanvasEllipse::~TQCanvasEllipse()
+{
+ hide();
+}
+
+/*!
+ Returns the width of the ellipse.
+*/
+int TQCanvasEllipse::width() const
+{
+ return w;
+}
+
+/*!
+ Returns the height of the ellipse.
+*/
+int TQCanvasEllipse::height() const
+{
+ return h;
+}
+
+/*!
+ Sets the \a width and \a height of the ellipse.
+*/
+void TQCanvasEllipse::setSize(int width, int height)
+{
+ if ( w != width || h != height ) {
+ removeFromChunks();
+ w = width;
+ h = height;
+ addToChunks();
+ }
+}
+
+/*!
+ \fn int TQCanvasEllipse::angleStart() const
+
+ Returns the start angle in 16ths of a degree. Initially
+ this will be 0.
+
+ \sa setAngles(), angleLength()
+*/
+
+/*!
+ \fn int TQCanvasEllipse::angleLength() const
+
+ Returns the length angle (the extent of the ellipse segment) in
+ 16ths of a degree. Initially this will be 360 * 16 (a complete
+ ellipse).
+
+ \sa setAngles(), angleStart()
+*/
+
+/*!
+ Sets the angles for the ellipse. The start angle is \a start and
+ the extent of the segment is \a length (the angle length) from the
+ \a start. The angles are specified in 16ths of a degree. By
+ default the ellipse will start at 0 and have an angle length of
+ 360 * 16 (a complete ellipse).
+
+ \sa angleStart(), angleLength()
+*/
+void TQCanvasEllipse::setAngles(int start, int length)
+{
+ if ( a1 != start || a2 != length ) {
+ removeFromChunks();
+ a1 = start;
+ a2 = length;
+ addToChunks();
+ }
+}
+
+/*!
+ \reimp
+*/
+TQPointArray TQCanvasEllipse::areaPoints() const
+{
+ TQPointArray r;
+ // makeArc at 0,0, then translate so that fixed point math doesn't overflow
+ r.makeArc(int(x()-w/2.0+0.5)-1, int(y()-h/2.0+0.5)-1, w+3, h+3, a1, a2);
+ r.resize(r.size()+1);
+ r.setPoint(r.size()-1,int(x()),int(y()));
+ return r;
+}
+
+// ### support outlines! Lars
+// ### TQRegion doesn't, so we cannot (try it). Warwick
+/*!
+ Draws the ellipse, centered at x(), y() using the painter \a p.
+
+ Note that TQCanvasEllipse does not support an outline (the pen is
+ always NoPen).
+*/
+void TQCanvasEllipse::drawShape(TQPainter & p)
+{
+ p.setPen(NoPen); // since TQRegion(TQPointArray) excludes outline :-( )-:
+ if ( !a1 && a2 == 360*16 ) {
+ p.drawEllipse(int(x()-w/2.0+0.5), int(y()-h/2.0+0.5), w, h);
+ } else {
+ p.drawPie(int(x()-w/2.0+0.5), int(y()-h/2.0+0.5), w, h, a1, a2);
+ }
+}
+
+
+/*!
+ \class TQCanvasText tqcanvas.h
+ \brief The TQCanvasText class provides a text object on a TQCanvas.
+\if defined(commercial)
+ It is part of the <a href="commercialeditions.html">TQt Enterprise Edition</a>.
+\endif
+
+ \module canvas
+ \ingroup graphics
+ \ingroup images
+
+ A canvas text item has text with font, color and tqalignment
+ attributes. The text and font can be set in the constructor or set
+ or changed later with setText() and setFont(). The color is set
+ with setColor() and the tqalignment with setTextFlags(). The text
+ item's bounding rectangle is retrieved with boundingRect().
+
+ The text can be drawn on a painter with draw().
+
+ Like any other canvas item text items can be moved with
+ TQCanvasItem::move() and TQCanvasItem::moveBy(), or by setting
+ coordinates with TQCanvasItem::setX(), TQCanvasItem::setY() and
+ TQCanvasItem::setZ().
+*/
+
+/*!
+ Constructs a TQCanvasText with the text "\<text\>", on \a canvas.
+*/
+TQCanvasText::TQCanvasText(TQCanvas* canvas) :
+ TQCanvasItem(canvas),
+ txt("<text>"), flags(0)
+{
+ setRect();
+}
+
+// ### add textflags to the constructor? Lars
+/*!
+ Constructs a TQCanvasText with the text \a t, on canvas \a canvas.
+*/
+TQCanvasText::TQCanvasText(const TQString& t, TQCanvas* canvas) :
+ TQCanvasItem(canvas),
+ txt(t), flags(0)
+{
+ setRect();
+}
+
+// ### see above
+/*!
+ Constructs a TQCanvasText with the text \a t and font \a f, on the
+ canvas \a canvas.
+*/
+TQCanvasText::TQCanvasText(const TQString& t, TQFont f, TQCanvas* canvas) :
+ TQCanvasItem(canvas),
+ txt(t), flags(0),
+ fnt(f)
+{
+ setRect();
+}
+
+/*!
+ Destroys the canvas text item.
+*/
+TQCanvasText::~TQCanvasText()
+{
+ removeFromChunks();
+}
+
+/*!
+ Returns the bounding rectangle of the text.
+*/
+TQRect TQCanvasText::boundingRect() const { return brect; }
+
+void TQCanvasText::setRect()
+{
+ brect = TQFontMetrics(fnt).boundingRect(int(x()), int(y()), 0, 0, flags, txt);
+ brect.setWidth(brect.width()+1);
+}
+
+/*!
+ \fn int TQCanvasText::textFlags() const
+
+ Returns the currently set tqalignment flags.
+
+ \sa setTextFlags() TQt::AlignmentFlags
+*/
+
+
+/*!
+ Sets the tqalignment flags to \a f. These are a bitwise OR of the
+ flags available to TQPainter::drawText() -- see the
+ \l{TQt::AlignmentFlags}.
+
+ \sa setFont() setColor()
+*/
+void TQCanvasText::setTextFlags(int f)
+{
+ if ( flags != f ) {
+ removeFromChunks();
+ flags = f;
+ setRect();
+ addToChunks();
+ }
+}
+
+/*!
+ Returns the text item's text.
+
+ \sa setText()
+*/
+TQString TQCanvasText::text() const
+{
+ return txt;
+}
+
+
+/*!
+ Sets the text item's text to \a t. The text may contain newlines.
+
+ \sa text(), setFont(), setColor() setTextFlags()
+*/
+void TQCanvasText::setText( const TQString& t )
+{
+ if ( txt != t ) {
+ removeFromChunks();
+ txt = t;
+ setRect();
+ addToChunks();
+ }
+}
+
+/*!
+ Returns the font in which the text is drawn.
+
+ \sa setFont()
+*/
+TQFont TQCanvasText::font() const
+{
+ return fnt;
+}
+
+/*!
+ Sets the font in which the text is drawn to font \a f.
+
+ \sa font()
+*/
+void TQCanvasText::setFont( const TQFont& f )
+{
+ if ( f != fnt ) {
+ removeFromChunks();
+ fnt = f;
+ setRect();
+ addToChunks();
+ }
+}
+
+/*!
+ Returns the color of the text.
+
+ \sa setColor()
+*/
+TQColor TQCanvasText::color() const
+{
+ return col;
+}
+
+/*!
+ Sets the color of the text to the color \a c.
+
+ \sa color(), setFont()
+*/
+void TQCanvasText::setColor(const TQColor& c)
+{
+ col=c;
+ changeChunks();
+}
+
+
+/*!
+ \reimp
+*/
+void TQCanvasText::moveBy(double dx, double dy)
+{
+ int idx = int(x()+dx)-int(x());
+ int idy = int(y()+dy)-int(y());
+ if ( idx || idy ) {
+ removeFromChunks();
+ }
+ myx+=dx;
+ myy+=dy;
+ if ( idx || idy ) {
+ brect.moveBy(idx,idy);
+ addToChunks();
+ }
+}
+
+/*!
+ Draws the text using the painter \a painter.
+*/
+void TQCanvasText::draw(TQPainter& painter)
+{
+ painter.setFont(fnt);
+ painter.setPen(col);
+ painter.drawText(brect, flags, txt);
+}
+
+/*!
+ \reimp
+*/
+void TQCanvasText::changeChunks()
+{
+ if (isVisible() && canvas()) {
+ int chunksize=canvas()->chunkSize();
+ for (int j=brect.top()/chunksize; j<=brect.bottom()/chunksize; j++) {
+ for (int i=brect.left()/chunksize; i<=brect.right()/chunksize; i++) {
+ canvas()->setChangedChunk(i,j);
+ }
+ }
+ }
+}
+
+/*!
+ Adds the text item to the appropriate chunks.
+*/
+void TQCanvasText::addToChunks()
+{
+ if (isVisible() && canvas()) {
+ int chunksize=canvas()->chunkSize();
+ for (int j=brect.top()/chunksize; j<=brect.bottom()/chunksize; j++) {
+ for (int i=brect.left()/chunksize; i<=brect.right()/chunksize; i++) {
+ canvas()->addItemToChunk(this,i,j);
+ }
+ }
+ }
+}
+
+/*!
+ Removes the text item from the appropriate chunks.
+*/
+void TQCanvasText::removeFromChunks()
+{
+ if (isVisible() && canvas()) {
+ int chunksize=canvas()->chunkSize();
+ for (int j=brect.top()/chunksize; j<=brect.bottom()/chunksize; j++) {
+ for (int i=brect.left()/chunksize; i<=brect.right()/chunksize; i++) {
+ canvas()->removeItemFromChunk(this,i,j);
+ }
+ }
+ }
+}
+
+
+/*!
+ Returns 0 (TQCanvasItem::Rtti_Item).
+
+ Make your derived classes return their own values for rtti(), so
+ that you can distinguish between objects returned by
+ TQCanvas::at(). You should use values greater than 1000 to allow
+ for extensions to this class.
+
+ Overuse of this functionality can damage it's extensibility. For
+ example, once you have identified a base class of a TQCanvasItem
+ found by TQCanvas::at(), cast it to that type and call meaningful
+ methods rather than acting upon the object based on its rtti
+ value.
+
+ For example:
+
+ \code
+ TQCanvasItem* item;
+ // Find an item, e.g. with TQCanvasItem::collisions().
+ ...
+ if (item->rtti() == MySprite::RTTI ) {
+ MySprite* s = (MySprite*)item;
+ if (s->isDamagable()) s->loseHitPoints(1000);
+ if (s->isHot()) myself->loseHitPoints(1000);
+ ...
+ }
+ \endcode
+*/
+int TQCanvasItem::rtti() const { return RTTI; }
+int TQCanvasItem::RTTI = Rtti_Item;
+
+/*!
+ Returns 1 (TQCanvasItem::Rtti_Sprite).
+
+ \sa TQCanvasItem::rtti()
+*/
+int TQCanvasSprite::rtti() const { return RTTI; }
+int TQCanvasSprite::RTTI = Rtti_Sprite;
+
+/*!
+ Returns 2 (TQCanvasItem::Rtti_PolygonalItem).
+
+ \sa TQCanvasItem::rtti()
+*/
+int TQCanvasPolygonalItem::rtti() const { return RTTI; }
+int TQCanvasPolygonalItem::RTTI = Rtti_PolygonalItem;
+
+/*!
+ Returns 3 (TQCanvasItem::Rtti_Text).
+
+ \sa TQCanvasItem::rtti()
+*/
+int TQCanvasText::rtti() const { return RTTI; }
+int TQCanvasText::RTTI = Rtti_Text;
+
+/*!
+ Returns 4 (TQCanvasItem::Rtti_Polygon).
+
+ \sa TQCanvasItem::rtti()
+*/
+int TQCanvasPolygon::rtti() const { return RTTI; }
+int TQCanvasPolygon::RTTI = Rtti_Polygon;
+
+/*!
+ Returns 5 (TQCanvasItem::Rtti_Rectangle).
+
+ \sa TQCanvasItem::rtti()
+*/
+int TQCanvasRectangle::rtti() const { return RTTI; }
+int TQCanvasRectangle::RTTI = Rtti_Rectangle;
+
+/*!
+ Returns 6 (TQCanvasItem::Rtti_Ellipse).
+
+ \sa TQCanvasItem::rtti()
+*/
+int TQCanvasEllipse::rtti() const { return RTTI; }
+int TQCanvasEllipse::RTTI = Rtti_Ellipse;
+
+/*!
+ Returns 7 (TQCanvasItem::Rtti_Line).
+
+ \sa TQCanvasItem::rtti()
+*/
+int TQCanvasLine::rtti() const { return RTTI; }
+int TQCanvasLine::RTTI = Rtti_Line;
+
+/*!
+ Returns 8 (TQCanvasItem::Rtti_Spline).
+
+ \sa TQCanvasItem::rtti()
+*/
+int TQCanvasSpline::rtti() const { return RTTI; }
+int TQCanvasSpline::RTTI = Rtti_Spline;
+
+/*!
+ Constructs a TQCanvasSprite which uses images from the
+ TQCanvasPixmapArray \a a.
+
+ The sprite in initially positioned at (0, 0) on \a canvas, using
+ frame 0.
+*/
+TQCanvasSprite::TQCanvasSprite(TQCanvasPixmapArray* a, TQCanvas* canvas) :
+ TQCanvasItem(canvas),
+ frm(0),
+ anim_val(0),
+ anim_state(0),
+ anim_type(0),
+ images(a)
+{
+}
+
+
+/*!
+ Set the array of images used for displaying the sprite to the
+ TQCanvasPixmapArray \a a.
+
+ If the current frame() is larger than the number of images in \a
+ a, the current frame will be reset to 0.
+*/
+void TQCanvasSprite::setSequence(TQCanvasPixmapArray* a)
+{
+ bool isvisible = isVisible();
+ if ( isvisible && images )
+ hide();
+ images = a;
+ if ( frm >= (int)images->count() )
+ frm = 0;
+ if ( isvisible )
+ show();
+}
+
+/*!
+\internal
+
+Marks any chunks the sprite touches as changed.
+*/
+void TQCanvasSprite::changeChunks()
+{
+ if (isVisible() && canvas()) {
+ int chunksize=canvas()->chunkSize();
+ for (int j=topEdge()/chunksize; j<=bottomEdge()/chunksize; j++) {
+ for (int i=leftEdge()/chunksize; i<=rightEdge()/chunksize; i++) {
+ canvas()->setChangedChunk(i,j);
+ }
+ }
+ }
+}
+
+/*!
+ Destroys the sprite and removes it from the canvas. Does \e not
+ delete the images.
+*/
+TQCanvasSprite::~TQCanvasSprite()
+{
+ removeFromChunks();
+}
+
+/*!
+ Sets the animation frame used for displaying the sprite to \a f,
+ an index into the TQCanvasSprite's TQCanvasPixmapArray. The call
+ will be ignored if \a f is larger than frameCount() or smaller
+ than 0.
+
+ \sa frame() move()
+*/
+void TQCanvasSprite::setFrame(int f)
+{
+ move(x(),y(),f);
+}
+
+/*!
+ \enum TQCanvasSprite::FrameAnimationType
+
+ This enum is used to identify the different types of frame
+ animation offered by TQCanvasSprite.
+
+ \value Cycle at each advance the frame number will be incremented by
+ 1 (modulo the frame count).
+ \value Oscillate at each advance the frame number will be
+ incremented by 1 up to the frame count then decremented to by 1 to
+ 0, repeating this sequence forever.
+*/
+
+/*!
+ Sets the animation characteristics for the sprite.
+
+ For \a type == \c Cycle, the frames will increase by \a step
+ at each advance, modulo the frameCount().
+
+ For \a type == \c Oscillate, the frames will increase by \a step
+ at each advance, up to the frameCount(), then decrease by \a step
+ back to 0, repeating forever.
+
+ The \a state parameter is for internal use.
+*/
+void TQCanvasSprite::setFrameAnimation(FrameAnimationType type, int step, int state)
+{
+ anim_val = step;
+ anim_type = type;
+ anim_state = state;
+ setAnimated(TRUE);
+}
+
+/*!
+ Extends the default TQCanvasItem implementation to provide the
+ functionality of setFrameAnimation().
+
+ The \a phase is 0 or 1: see TQCanvasItem::advance() for details.
+
+ \sa TQCanvasItem::advance() setVelocity()
+*/
+void TQCanvasSprite::advance(int phase)
+{
+ if ( phase==1 ) {
+ int nf = frame();
+ if ( anim_type == Oscillate ) {
+ if ( anim_state )
+ nf += anim_val;
+ else
+ nf -= anim_val;
+ if ( nf < 0 ) {
+ nf = abs(anim_val);
+ anim_state = !anim_state;
+ } else if ( nf >= frameCount() ) {
+ nf = frameCount()-1-abs(anim_val);
+ anim_state = !anim_state;
+ }
+ } else {
+ nf = (nf + anim_val + frameCount()) % frameCount();
+ }
+ move(x()+xVelocity(),y()+yVelocity(),nf);
+ }
+}
+
+
+/*!
+ \fn int TQCanvasSprite::frame() const
+
+ Returns the index of the current animation frame in the
+ TQCanvasSprite's TQCanvasPixmapArray.
+
+ \sa setFrame(), move()
+*/
+
+/*!
+ \fn int TQCanvasSprite::frameCount() const
+
+ Returns the number of frames in the TQCanvasSprite's
+ TQCanvasPixmapArray.
+*/
+
+
+/*!
+ \reimp
+ \internal
+ Moves the sprite to the position \a x, \a y.
+ Keep it visible.
+*/
+void TQCanvasSprite::move(double x, double y) { TQCanvasItem::move(x,y); }
+
+/*!
+ \fn void TQCanvasSprite::move(double nx, double ny, int nf)
+
+ Set the position of the sprite to \a nx, \a ny and the current
+ frame to \a nf. \a nf will be ignored if it is larger than
+ frameCount() or smaller than 0.
+*/
+void TQCanvasSprite::move(double nx, double ny, int nf)
+{
+ if (isVisible() && canvas()) {
+ hide();
+ TQCanvasItem::move(nx,ny);
+ if ( nf >= 0 && nf < frameCount() )
+ frm=nf;
+ show();
+ } else {
+ TQCanvasItem::move(nx,ny);
+ if ( nf >= 0 && nf < frameCount() )
+ frm=nf;
+ }
+}
+
+class TQCanvasPolygonScanner : public TQPolygonScanner {
+ TQPolygonalProcessor& processor;
+public:
+ TQCanvasPolygonScanner(TQPolygonalProcessor& p) :
+ processor(p)
+ {
+ }
+ void processSpans( int n, TQPoint* point, int* width )
+ {
+ processor.doSpans(n,point,width);
+ }
+};
+
+void TQCanvasPolygonalItem::scanPolygon(const TQPointArray& pa, int winding, TQPolygonalProcessor& process) const
+{
+ TQCanvasPolygonScanner scanner(process);
+ scanner.scan(pa,winding);
+}
+
+
+#endif // TQT_NO_CANVAS