diff options
Diffstat (limited to 'doc/html/canvas-example.html')
| -rw-r--r-- | doc/html/canvas-example.html | 941 |
1 files changed, 941 insertions, 0 deletions
diff --git a/doc/html/canvas-example.html b/doc/html/canvas-example.html new file mode 100644 index 0000000..b4b9a43 --- /dev/null +++ b/doc/html/canvas-example.html @@ -0,0 +1,941 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> +<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/examples/canvas/canvas.doc:1 --> +<html> +<head> +<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> +<title>Canvas Example</title> +<style type="text/css"><!-- +fn { margin-left: 1cm; text-indent: -1cm; } +a:link { color: #004faf; text-decoration: none } +a:visited { color: #672967; text-decoration: none } +body { background: #ffffff; color: black; } +--></style> +</head> +<body> + +<table border="0" cellpadding="0" cellspacing="0" width="100%"> +<tr bgcolor="#E5E5E5"> +<td valign=center> + <a href="index.html"> +<font color="#004faf">Home</font></a> + | <a href="classes.html"> +<font color="#004faf">All Classes</font></a> + | <a href="mainclasses.html"> +<font color="#004faf">Main Classes</font></a> + | <a href="annotated.html"> +<font color="#004faf">Annotated</font></a> + | <a href="groups.html"> +<font color="#004faf">Grouped Classes</font></a> + | <a href="functions.html"> +<font color="#004faf">Functions</font></a> +</td> +<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>Canvas Example</h1> + + +<p> +This example shows a <a href="qcanvas.html">QCanvas</a> and some <a href="qcanvasitem.html">QCanvasItem</a>s in action. +You can do a lot more with QCanvas than we show here, but the +example provides a taste of what can be done. +<p> <hr> +<p> Header file: +<p> <pre>#ifndef EXAMPLE_H +#define EXAMPLE_H + +#include <<a href="qpopupmenu-h.html">qpopupmenu.h</a>> +#include <<a href="qmainwindow-h.html">qmainwindow.h</a>> +#include <<a href="qintdict-h.html">qintdict.h</a>> +#include <<a href="qcanvas-h.html">qcanvas.h</a>> + +class BouncyLogo : public <a href="qcanvassprite.html">QCanvasSprite</a> { + void initPos(); + void initSpeed(); +public: + BouncyLogo(QCanvas*); + void advance(int); + int rtti() const; +}; + + +class FigureEditor : public <a href="qcanvasview.html">QCanvasView</a> { + <a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a> + +public: + FigureEditor(QCanvas&, QWidget* parent=0, const char* name=0, WFlags f=0); + void clear(); + +protected: + void contentsMousePressEvent(QMouseEvent*); + void contentsMouseMoveEvent(QMouseEvent*); + +signals: + void status(const <a href="qstring.html">QString</a>&); + +private: + <a href="qcanvasitem.html">QCanvasItem</a>* moving; + <a href="qpoint.html">QPoint</a> moving_start; +}; + +class Main : public <a href="qmainwindow.html">QMainWindow</a> { + Q_OBJECT + +public: + Main(QCanvas&, QWidget* parent=0, const char* name=0, WFlags f=0); + ~Main(); + +public slots: + void help(); + +private slots: + void aboutQt(); + void newView(); + void clear(); + void init(); + + void addSprite(); + void addCircle(); + void addHexagon(); + void addPolygon(); + void addSpline(); + void addText(); + void addLine(); + void addRectangle(); + void addMesh(); + void addLogo(); + void addButterfly(); + + void enlarge(); + void shrink(); + void rotateClockwise(); + void rotateCounterClockwise(); + void zoomIn(); + void zoomOut(); + void mirror(); + void moveL(); + void moveR(); + void moveU(); + void moveD(); + + void print(); + + void toggleDoubleBuffer(); + +private: + <a href="qcanvas.html">QCanvas</a>& canvas; + FigureEditor *editor; + + <a href="qpopupmenu.html">QPopupMenu</a>* options; + <a href="qprinter.html">QPrinter</a>* printer; + int dbf_id; +}; + +#endif +</pre> + +<p> <hr> +<p> Implementation: +<p> <pre>#include <<a href="qdatetime-h.html">qdatetime.h</a>> +#include <<a href="qmainwindow-h.html">qmainwindow.h</a>> +#include <<a href="qstatusbar-h.html">qstatusbar.h</a>> +#include <<a href="qmessagebox-h.html">qmessagebox.h</a>> +#include <<a href="qmenubar-h.html">qmenubar.h</a>> +#include <<a href="qapplication-h.html">qapplication.h</a>> +#include <<a href="qpainter-h.html">qpainter.h</a>> +#include <<a href="qprinter-h.html">qprinter.h</a>> +#include <<a href="qlabel-h.html">qlabel.h</a>> +#include <<a href="qimage-h.html">qimage.h</a>> +#include <<a href="qprogressdialog-h.html">qprogressdialog.h</a>> +#include "canvas.h" + +#include <stdlib.h> + +// We use a global variable to save memory - all the brushes and pens in +// the mesh are shared. +static QBrush *tb = 0; +static QPen *tp = 0; + +class EdgeItem; +class NodeItem; + +class EdgeItem: public <a href="qcanvasline.html">QCanvasLine</a> +{ +public: + EdgeItem( NodeItem*, NodeItem*, QCanvas *canvas ); + void setFromPoint( int x, int y ) ; + void setToPoint( int x, int y ); + static int count() { return c; } + void moveBy(double dx, double dy); +private: + static int c; +}; + +static const int imageRTTI = 984376; + + +class ImageItem: public <a href="qcanvasrectangle.html">QCanvasRectangle</a> +{ +public: + ImageItem( <a href="qimage.html">QImage</a> img, QCanvas *canvas ); + int rtti () const { return imageRTTI; } + bool hit( const <a href="qpoint.html">QPoint</a>&) const; +protected: + void drawShape( <a href="qpainter.html">QPainter</a> & ); +private: + <a href="qimage.html">QImage</a> image; + <a href="qpixmap.html">QPixmap</a> pixmap; +}; + + +<a name="f623"></a>ImageItem::ImageItem( <a href="qimage.html">QImage</a> img, QCanvas *canvas ) + : <a href="qcanvasrectangle.html">QCanvasRectangle</a>( canvas ), image(img) +{ +<a name="x2935"></a><a name="x2932"></a> <a href="qcanvasrectangle.html#setSize">setSize</a>( image.<a href="qimage.html#width">width</a>(), image.<a href="qimage.html#height">height</a>() ); + +#if !defined(Q_WS_QWS) +<a name="x2943"></a> pixmap.<a href="qpixmap.html#convertFromImage">convertFromImage</a>(image, OrderedAlphaDither); +#endif +} + + +<a name="x2925"></a>void ImageItem::<a href="qcanvasrectangle.html#drawShape">drawShape</a>( <a href="qpainter.html">QPainter</a> &p ) +{ +// On Qt/Embedded, we can paint a QImage as fast as a QPixmap, +// but on other platforms, we need to use a QPixmap. +#if defined(Q_WS_QWS) +<a name="x2941"></a> p.<a href="qpainter.html#drawImage">drawImage</a>( int(<a href="qcanvasitem.html#x">x</a>()), int(<a href="qcanvasitem.html#y">y</a>()), image, 0, 0, -1, -1, OrderedAlphaDither ); +#else + p.<a href="qpainter.html#drawPixmap">drawPixmap</a>( int(<a href="qcanvasitem.html#x">x</a>()), int(<a href="qcanvasitem.html#y">y</a>()), pixmap ); +#endif +} + +bool <a name="f624"></a>ImageItem::hit( const <a href="qpoint.html">QPoint</a> &p ) const +{ +<a name="x2944"></a> int ix = p.<a href="qpoint.html#x">x</a>()-int(<a href="qcanvasitem.html#x">x</a>()); +<a name="x2945"></a> int iy = p.<a href="qpoint.html#y">y</a>()-int(<a href="qcanvasitem.html#y">y</a>()); +<a name="x2934"></a> if ( !image.<a href="qimage.html#valid">valid</a>( ix , iy ) ) + return FALSE; +<a name="x2933"></a> QRgb pixel = image.<a href="qimage.html#pixel">pixel</a>( ix, iy ); + return qAlpha( pixel ) != 0; +} + +class NodeItem: public <a href="qcanvasellipse.html">QCanvasEllipse</a> +{ +public: + NodeItem( <a href="qcanvas.html">QCanvas</a> *canvas ); + ~NodeItem() {} + + void addInEdge( EdgeItem *edge ) { inList.<a href="qptrlist.html#append">append</a>( edge ); } + void addOutEdge( EdgeItem *edge ) { outList.<a href="qptrlist.html#append">append</a>( edge ); } + + void moveBy(double dx, double dy); + + // QPoint center() { return boundingRect().center(); } +private: + <a href="qptrlist.html">QPtrList</a><EdgeItem> inList; + <a href="qptrlist.html">QPtrList</a><EdgeItem> outList; +}; + + +int EdgeItem::c = 0; + + +<a name="x2916"></a>void EdgeItem::<a href="qcanvasitem.html#moveBy">moveBy</a>(double, double) +{ + //nothing +} + +<a name="f618"></a>EdgeItem::EdgeItem( NodeItem *from, NodeItem *to, QCanvas *canvas ) + : <a href="qcanvasline.html">QCanvasLine</a>( canvas ) +{ + c++; + setPen( *tp ); + setBrush( *tb ); + from->addOutEdge( this ); + to->addInEdge( this ); +<a name="x2921"></a><a name="x2920"></a> setPoints( int(from-><a href="qcanvasitem.html#x">x</a>()), int(from-><a href="qcanvasitem.html#y">y</a>()), int(to->x()), int(to->y()) ); + setZ( 127 ); +} + +void <a name="f619"></a>EdgeItem::setFromPoint( int x, int y ) +{ + setPoints( x,y, endPoint().x(), endPoint().y() ); +} + +void <a name="f620"></a>EdgeItem::setToPoint( int x, int y ) +{ + setPoints( startPoint().x(), startPoint().y(), x, y ); +} + + + +void NodeItem::<a href="qcanvasitem.html#moveBy">moveBy</a>(double dx, double dy) +{ + QCanvasEllipse::<a href="qcanvasitem.html#moveBy">moveBy</a>( dx, dy ); + + <a href="qptrlistiterator.html">QPtrListIterator</a><EdgeItem> it1( inList ); + EdgeItem *edge; +<a name="x2949"></a> while (( edge = it1.<a href="qptrlistiterator.html#current">current</a>() )) { + ++it1; + edge->setToPoint( int(<a href="qwidget.html#x">x</a>()), int(<a href="qcanvasitem.html#y">y</a>()) ); + } + <a href="qptrlistiterator.html">QPtrListIterator</a><EdgeItem> it2( outList ); + while (( edge = it2.<a href="qptrlistiterator.html#current">current</a>() )) { + ++it2; + edge->setFromPoint( int(<a href="qcanvasitem.html#x">x</a>()), int(<a href="qcanvasitem.html#y">y</a>()) ); + } +} + +<a name="f655"></a>NodeItem::NodeItem( <a href="qcanvas.html">QCanvas</a> *canvas ) + : <a href="qcanvasellipse.html">QCanvasEllipse</a>( 6, 6, canvas ) +{ + setPen( *tp ); + setBrush( *tb ); + <a href="qcanvasitem.html#setZ">setZ</a>( 128 ); +} + +<a name="f621"></a>FigureEditor::FigureEditor( + <a href="qcanvas.html">QCanvas</a>& c, QWidget* parent, + const char* name, WFlags f) : + <a href="qcanvasview.html">QCanvasView</a>(&c,parent,name,f) +{ +} + +<a name="x2951"></a>void FigureEditor::<a href="qscrollview.html#contentsMousePressEvent">contentsMousePressEvent</a>(QMouseEvent* e) +{ + <a href="qpoint.html">QPoint</a> p = inverseWorldMatrix().map(e->pos()); + <a href="qcanvasitemlist.html">QCanvasItemList</a> l=<a href="qcanvasitem.html#canvas">canvas</a>()->collisions(p); +<a name="x2953"></a><a name="x2952"></a> for (QCanvasItemList::Iterator it=l.<a href="qvaluelist.html#begin">begin</a>(); it!=l.<a href="qvaluelist.html#end">end</a>(); ++it) { + if ( (*it)->rtti() == imageRTTI ) { + ImageItem *item= (ImageItem*)(*it); + if ( !item->hit( p ) ) + continue; + } + moving = *it; + moving_start = p; + return; + } + moving = 0; +} + +void <a name="f622"></a>FigureEditor::clear() +{ + <a href="qcanvasitemlist.html">QCanvasItemList</a> list = <a href="qcanvasitem.html#canvas">canvas</a>()->allItems(); + QCanvasItemList::Iterator it = list.<a href="qvaluelist.html#begin">begin</a>(); + for (; it != list.<a href="qvaluelist.html#end">end</a>(); ++it) { + if ( *it ) + delete *it; + } +} + +<a name="x2950"></a>void FigureEditor::<a href="qscrollview.html#contentsMouseMoveEvent">contentsMouseMoveEvent</a>(QMouseEvent* e) +{ + if ( moving ) { + <a href="qpoint.html">QPoint</a> p = inverseWorldMatrix().map(e->pos()); + moving->moveBy(p.<a href="qpoint.html#x">x</a>() - moving_start.x(), + p.<a href="qpoint.html#y">y</a>() - moving_start.y()); + moving_start = p; + <a href="qcanvasitem.html#canvas">canvas</a>()->update(); + } +} + + + +<a name="f615"></a>BouncyLogo::BouncyLogo(QCanvas* canvas) : + <a href="qcanvassprite.html">QCanvasSprite</a>(0,canvas) +{ + static QCanvasPixmapArray logo("qt-trans.xpm"); + <a href="qcanvassprite.html#setSequence">setSequence</a>(&logo); + <a href="qcanvasitem.html#setAnimated">setAnimated</a>(TRUE); + initPos(); +} + + +const int logo_rtti = 1234; + +<a name="x2928"></a>int BouncyLogo::<a href="qcanvassprite.html#rtti">rtti</a>() const +{ + return logo_rtti; +} + +void <a name="f616"></a>BouncyLogo::initPos() +{ + initSpeed(); + int trial=1000; + do { + <a href="qcanvassprite.html#move">move</a>(rand()%canvas()->width(),rand()%canvas()->height()); + advance(0); + } while (trial-- && xVelocity()==0.0 && yVelocity()==0.0); +} + +void <a name="f617"></a>BouncyLogo::initSpeed() +{ + const double speed = 4.0; + double d = (double)(rand()%1024) / 1024.0; + setVelocity( d*speed*2-speed, (1-d)*speed*2-speed ); +} + +<a name="x2927"></a>void BouncyLogo::<a href="qcanvassprite.html#advance">advance</a>(int stage) +{ + switch ( stage ) { + case 0: { + double vx = xVelocity(); + double vy = yVelocity(); + + if ( vx == 0.0 && vy == 0.0 ) { + // stopped last turn + initSpeed(); + vx = xVelocity(); + vy = yVelocity(); + } + + double nx = <a href="qwidget.html#x">x</a>() + vx; + double ny = <a href="qwidget.html#y">y</a>() + vy; + + if ( nx < 0 || nx >= canvas()->width() ) + vx = -vx; + if ( ny < 0 || ny >= canvas()->height() ) + vy = -vy; + + for (int bounce=0; bounce<4; bounce++) { + <a href="qcanvasitemlist.html">QCanvasItemList</a> l=collisions(FALSE); + for (QCanvasItemList::Iterator it=l.<a href="qvaluelist.html#begin">begin</a>(); it!=l.<a href="qvaluelist.html#end">end</a>(); ++it) { + <a href="qcanvasitem.html">QCanvasItem</a> *hit = *it; +<a name="x2917"></a><a name="x2914"></a> if ( hit-><a href="qcanvasitem.html#rtti">rtti</a>()==logo_rtti && hit-><a href="qcanvasitem.html#collidesWith">collidesWith</a>(this) ) { + switch ( bounce ) { + case 0: + vx = -vx; + break; + case 1: + vy = -vy; + vx = -vx; + break; + case 2: + vx = -vx; + break; + case 3: + // Stop for this turn + vx = 0; + vy = 0; + break; + } + setVelocity(vx,vy); + break; + } + } + } + + if ( <a href="qwidget.html#x">x</a>()+vx < 0 || x()+vx >= canvas()->width() ) + vx = 0; + if ( <a href="qwidget.html#y">y</a>()+vy < 0 || y()+vy >= canvas()->height() ) + vy = 0; + + setVelocity(vx,vy); + } break; + case 1: +<a name="x2913"></a> <a href="qcanvasitem.html">QCanvasItem</a>::<a href="qcanvasitem.html#advance">advance</a>(stage); + break; + } +} + +static uint mainCount = 0; +static QImage *butterflyimg; +static QImage *logoimg; + +<a name="f625"></a>Main::Main(QCanvas& c, QWidget* parent, const char* name, WFlags f) : + <a href="qmainwindow.html">QMainWindow</a>(parent,name,f), + canvas(c) +{ + editor = new FigureEditor(canvas,this); + <a href="qmenubar.html">QMenuBar</a>* menu = <a href="qmainwindow.html#menuBar">menuBar</a>(); + + <a href="qpopupmenu.html">QPopupMenu</a>* file = new <a href="qpopupmenu.html">QPopupMenu</a>( menu ); +<a name="x2936"></a> file-><a href="qmenudata.html#insertItem">insertItem</a>("&Fill canvas", this, SLOT(init()), CTRL+Key_F); + file-><a href="qmenudata.html#insertItem">insertItem</a>("&Erase canvas", this, SLOT(clear()), CTRL+Key_E); + file-><a href="qmenudata.html#insertItem">insertItem</a>("&New view", this, SLOT(newView()), CTRL+Key_N); + file-><a href="qmenudata.html#insertSeparator">insertSeparator</a>(); + file-><a href="qmenudata.html#insertItem">insertItem</a>("&Print...", this, SLOT(print()), CTRL+Key_P); + file-><a href="qmenudata.html#insertSeparator">insertSeparator</a>(); + file-><a href="qmenudata.html#insertItem">insertItem</a>("E&xit", qApp, SLOT(<a href="qapplication.html#quit">quit</a>()), CTRL+Key_Q); + menu-><a href="qmenudata.html#insertItem">insertItem</a>("&File", file); + + <a href="qpopupmenu.html">QPopupMenu</a>* edit = new <a href="qpopupmenu.html">QPopupMenu</a>( menu ); + edit-><a href="qmenudata.html#insertItem">insertItem</a>("Add &Circle", this, SLOT(addCircle()), ALT+Key_C); + edit-><a href="qmenudata.html#insertItem">insertItem</a>("Add &Hexagon", this, SLOT(addHexagon()), ALT+Key_H); + edit-><a href="qmenudata.html#insertItem">insertItem</a>("Add &Polygon", this, SLOT(addPolygon()), ALT+Key_P); + edit-><a href="qmenudata.html#insertItem">insertItem</a>("Add Spl&ine", this, SLOT(addSpline()), ALT+Key_I); + edit-><a href="qmenudata.html#insertItem">insertItem</a>("Add &Text", this, SLOT(addText()), ALT+Key_T); + edit-><a href="qmenudata.html#insertItem">insertItem</a>("Add &Line", this, SLOT(addLine()), ALT+Key_L); + edit-><a href="qmenudata.html#insertItem">insertItem</a>("Add &Rectangle", this, SLOT(addRectangle()), ALT+Key_R); + edit-><a href="qmenudata.html#insertItem">insertItem</a>("Add &Sprite", this, SLOT(addSprite()), ALT+Key_S); + edit-><a href="qmenudata.html#insertItem">insertItem</a>("Create &Mesh", this, SLOT(addMesh()), ALT+Key_M ); + edit-><a href="qmenudata.html#insertItem">insertItem</a>("Add &Alpha-blended image", this, SLOT(addButterfly()), ALT+Key_A); + menu-><a href="qmenudata.html#insertItem">insertItem</a>("&Edit", edit); + + <a href="qpopupmenu.html">QPopupMenu</a>* view = new <a href="qpopupmenu.html">QPopupMenu</a>( menu ); + view-><a href="qmenudata.html#insertItem">insertItem</a>("&Enlarge", this, SLOT(enlarge()), SHIFT+CTRL+Key_Plus); + view-><a href="qmenudata.html#insertItem">insertItem</a>("Shr&ink", this, SLOT(shrink()), SHIFT+CTRL+Key_Minus); + view-><a href="qmenudata.html#insertSeparator">insertSeparator</a>(); + view-><a href="qmenudata.html#insertItem">insertItem</a>("&Rotate clockwise", this, SLOT(rotateClockwise()), CTRL+Key_PageDown); + view-><a href="qmenudata.html#insertItem">insertItem</a>("Rotate &counterclockwise", this, SLOT(rotateCounterClockwise()), CTRL+Key_PageUp); + view-><a href="qmenudata.html#insertItem">insertItem</a>("&Zoom in", this, SLOT(zoomIn()), CTRL+Key_Plus); + view-><a href="qmenudata.html#insertItem">insertItem</a>("Zoom &out", this, SLOT(zoomOut()), CTRL+Key_Minus); + view-><a href="qmenudata.html#insertItem">insertItem</a>("Translate left", this, SLOT(moveL()), CTRL+Key_Left); + view-><a href="qmenudata.html#insertItem">insertItem</a>("Translate right", this, SLOT(moveR()), CTRL+Key_Right); + view-><a href="qmenudata.html#insertItem">insertItem</a>("Translate up", this, SLOT(moveU()), CTRL+Key_Up); + view-><a href="qmenudata.html#insertItem">insertItem</a>("Translate down", this, SLOT(moveD()), CTRL+Key_Down); + view-><a href="qmenudata.html#insertItem">insertItem</a>("&Mirror", this, SLOT(mirror()), CTRL+Key_Home); + menu-><a href="qmenudata.html#insertItem">insertItem</a>("&View", view); + + options = new <a href="qpopupmenu.html">QPopupMenu</a>( menu ); + dbf_id = options-><a href="qmenudata.html#insertItem">insertItem</a>("Double buffer", this, SLOT(toggleDoubleBuffer())); +<a name="x2939"></a> options-><a href="qmenudata.html#setItemChecked">setItemChecked</a>(dbf_id, TRUE); + menu-><a href="qmenudata.html#insertItem">insertItem</a>("&Options",options); + + menu-><a href="qmenudata.html#insertSeparator">insertSeparator</a>(); + + <a href="qpopupmenu.html">QPopupMenu</a>* help = new <a href="qpopupmenu.html">QPopupMenu</a>( menu ); + help-><a href="qmenudata.html#insertItem">insertItem</a>("&About", this, SLOT(help()), Key_F1); + help-><a href="qmenudata.html#setItemChecked">setItemChecked</a>(dbf_id, TRUE); + menu-><a href="qmenudata.html#insertItem">insertItem</a>("&Help",help); + + <a href="qmainwindow.html#statusBar">statusBar</a>(); + + <a href="qmainwindow.html#setCentralWidget">setCentralWidget</a>(editor); + + printer = 0; + + init(); +} + +void <a name="f626"></a>Main::init() +{ + clear(); + + static int r=24; + srand(++r); + + mainCount++; + butterflyimg = 0; + logoimg = 0; + + int i; +<a name="x2912"></a> for ( i=0; i<canvas.<a href="qcanvas.html#width">width</a>() / 56; i++) { + addButterfly(); + } + for ( i=0; i<canvas.<a href="qcanvas.html#width">width</a>() / 85; i++) { + addHexagon(); + } + for ( i=0; i<canvas.<a href="qcanvas.html#width">width</a>() / 128; i++) { + addLogo(); + } +} + +Main::~Main() +{ + delete printer; + if ( !--mainCount ) { + delete[] butterflyimg; + butterflyimg = 0; + delete[] logoimg; + logoimg = 0; + } +} + +void <a name="f627"></a>Main::newView() +{ + // Open a new view... have it delete when closed. + Main *m = new Main(canvas, 0, 0, WDestructiveClose); + qApp-><a href="qapplication.html#setMainWidget">setMainWidget</a>(m); + m-><a href="qwidget.html#show">show</a>(); + qApp-><a href="qapplication.html#setMainWidget">setMainWidget</a>(0); +} + +void <a name="f628"></a>Main::clear() +{ + editor->clear(); +} + +void <a name="f629"></a>Main::help() +{ + static QMessageBox* about = new <a href="qmessagebox.html">QMessageBox</a>( "Qt Canvas Example", + "<h3>The QCanvas classes example</h3>" + "<ul>" + "<li> Press ALT-S for some sprites." + "<li> Press ALT-C for some circles." + "<li> Press ALT-L for some lines." + "<li> Drag the objects around." + "<li> Read the code!" + "</ul>", QMessageBox::Information, 1, 0, 0, this, 0, FALSE ); + about->setButtonText( 1, "Dismiss" ); + about->show(); +} + +void <a name="f630"></a>Main::aboutQt() +{ + QMessageBox::<a href="qmessagebox.html#aboutQt">aboutQt</a>( this, "Qt Canvas Example" ); +} + +void <a name="f631"></a>Main::toggleDoubleBuffer() +{ +<a name="x2938"></a> bool s = !options-><a href="qmenudata.html#isItemChecked">isItemChecked</a>(dbf_id); + options-><a href="qmenudata.html#setItemChecked">setItemChecked</a>(dbf_id,s); +<a name="x2911"></a> canvas.<a href="qcanvas.html#setDoubleBuffering">setDoubleBuffering</a>(s); +} + +void <a name="f632"></a>Main::enlarge() +{ +<a name="x2910"></a><a name="x2909"></a> canvas.<a href="qcanvas.html#resize">resize</a>(canvas.<a href="qcanvas.html#width">width</a>()*4/3, canvas.<a href="qcanvas.html#height">height</a>()*4/3); +} + +void <a name="f633"></a>Main::shrink() +{ + canvas.<a href="qcanvas.html#resize">resize</a>(canvas.<a href="qcanvas.html#width">width</a>()*3/4, canvas.<a href="qcanvas.html#height">height</a>()*3/4); +} + +void <a name="f634"></a>Main::rotateClockwise() +{ +<a name="x2931"></a> <a href="qwmatrix.html">QWMatrix</a> m = editor-><a href="qcanvasview.html#worldMatrix">worldMatrix</a>(); +<a name="x2955"></a> m.<a href="qwmatrix.html#rotate">rotate</a>( 22.5 ); +<a name="x2930"></a> editor-><a href="qcanvasview.html#setWorldMatrix">setWorldMatrix</a>( m ); +} + +void <a name="f635"></a>Main::rotateCounterClockwise() +{ + <a href="qwmatrix.html">QWMatrix</a> m = editor-><a href="qcanvasview.html#worldMatrix">worldMatrix</a>(); + m.<a href="qwmatrix.html#rotate">rotate</a>( -22.5 ); + editor-><a href="qcanvasview.html#setWorldMatrix">setWorldMatrix</a>( m ); +} + +void <a name="f636"></a>Main::zoomIn() +{ + <a href="qwmatrix.html">QWMatrix</a> m = editor-><a href="qcanvasview.html#worldMatrix">worldMatrix</a>(); +<a name="x2956"></a> m.<a href="qwmatrix.html#scale">scale</a>( 2.0, 2.0 ); + editor-><a href="qcanvasview.html#setWorldMatrix">setWorldMatrix</a>( m ); +} + +void <a name="f637"></a>Main::zoomOut() +{ + <a href="qwmatrix.html">QWMatrix</a> m = editor-><a href="qcanvasview.html#worldMatrix">worldMatrix</a>(); + m.<a href="qwmatrix.html#scale">scale</a>( 0.5, 0.5 ); + editor-><a href="qcanvasview.html#setWorldMatrix">setWorldMatrix</a>( m ); +} + +void <a name="f638"></a>Main::mirror() +{ + <a href="qwmatrix.html">QWMatrix</a> m = editor-><a href="qcanvasview.html#worldMatrix">worldMatrix</a>(); + m.<a href="qwmatrix.html#scale">scale</a>( -1, 1 ); + editor-><a href="qcanvasview.html#setWorldMatrix">setWorldMatrix</a>( m ); +} + +void <a name="f639"></a>Main::moveL() +{ + <a href="qwmatrix.html">QWMatrix</a> m = editor-><a href="qcanvasview.html#worldMatrix">worldMatrix</a>(); +<a name="x2957"></a> m.<a href="qwmatrix.html#translate">translate</a>( -16, 0 ); + editor-><a href="qcanvasview.html#setWorldMatrix">setWorldMatrix</a>( m ); +} + +void <a name="f640"></a>Main::moveR() +{ + <a href="qwmatrix.html">QWMatrix</a> m = editor-><a href="qcanvasview.html#worldMatrix">worldMatrix</a>(); + m.<a href="qwmatrix.html#translate">translate</a>( +16, 0 ); + editor-><a href="qcanvasview.html#setWorldMatrix">setWorldMatrix</a>( m ); +} + +void <a name="f641"></a>Main::moveU() +{ + <a href="qwmatrix.html">QWMatrix</a> m = editor-><a href="qcanvasview.html#worldMatrix">worldMatrix</a>(); + m.<a href="qwmatrix.html#translate">translate</a>( 0, -16 ); + editor-><a href="qcanvasview.html#setWorldMatrix">setWorldMatrix</a>( m ); +} + +void <a name="f642"></a>Main::moveD() +{ + <a href="qwmatrix.html">QWMatrix</a> m = editor-><a href="qcanvasview.html#worldMatrix">worldMatrix</a>(); + m.<a href="qwmatrix.html#translate">translate</a>( 0, +16 ); + editor-><a href="qcanvasview.html#setWorldMatrix">setWorldMatrix</a>( m ); +} + +void <a name="f643"></a>Main::print() +{ + if ( !printer ) printer = new <a href="qprinter.html">QPrinter</a>; + if ( printer->setup(this) ) { + <a href="qpainter.html">QPainter</a> pp(printer); +<a name="x2908"></a> canvas.<a href="qcanvas.html#drawArea">drawArea</a>(QRect(0,0,canvas.<a href="qcanvas.html#width">width</a>(),canvas.<a href="qcanvas.html#height">height</a>()),&pp,FALSE); + } +} + + +void <a name="f644"></a>Main::addSprite() +{ + <a href="qcanvasitem.html">QCanvasItem</a>* i = new BouncyLogo(&canvas); +<a name="x2918"></a> i-><a href="qcanvasitem.html#setZ">setZ</a>(rand()%256); +<a name="x2919"></a> i-><a href="qcanvasitem.html#show">show</a>(); +} + +QString butterfly_fn; +QString logo_fn; + + +void <a name="f645"></a>Main::addButterfly() +{ + if ( butterfly_fn.isEmpty() ) + return; + if ( !butterflyimg ) { + butterflyimg = new <a href="qimage.html">QImage</a>[4]; + butterflyimg[0].load( butterfly_fn ); + butterflyimg[1] = butterflyimg[0].smoothScale( int(butterflyimg[0].width()*0.75), + int(butterflyimg[0].height()*0.75) ); + butterflyimg[2] = butterflyimg[0].smoothScale( int(butterflyimg[0].width()*0.5), + int(butterflyimg[0].height()*0.5) ); + butterflyimg[3] = butterflyimg[0].smoothScale( int(butterflyimg[0].width()*0.25), + int(butterflyimg[0].height()*0.25) ); + } + <a href="qcanvaspolygonalitem.html">QCanvasPolygonalItem</a>* i = new ImageItem(butterflyimg[rand()%4],&canvas); +<a name="x2915"></a> i-><a href="qcanvasitem.html#move">move</a>(rand()%(canvas.<a href="qcanvas.html#width">width</a>()-butterflyimg-><a href="qimage.html#width">width</a>()), + rand()%(canvas.<a href="qcanvas.html#height">height</a>()-butterflyimg-><a href="qimage.html#height">height</a>())); + i-><a href="qcanvasitem.html#setZ">setZ</a>(rand()%256+250); + i-><a href="qcanvasitem.html#show">show</a>(); +} + +void <a name="f646"></a>Main::addLogo() +{ + if ( logo_fn.isEmpty() ) + return; + if ( !logoimg ) { + logoimg = new <a href="qimage.html">QImage</a>[4]; + logoimg[0].load( logo_fn ); + logoimg[1] = logoimg[0].smoothScale( int(logoimg[0].width()*0.75), + int(logoimg[0].height()*0.75) ); + logoimg[2] = logoimg[0].smoothScale( int(logoimg[0].width()*0.5), + int(logoimg[0].height()*0.5) ); + logoimg[3] = logoimg[0].smoothScale( int(logoimg[0].width()*0.25), + int(logoimg[0].height()*0.25) ); + } + <a href="qcanvaspolygonalitem.html">QCanvasPolygonalItem</a>* i = new ImageItem(logoimg[rand()%4],&canvas); + i-><a href="qcanvasitem.html#move">move</a>(rand()%(canvas.<a href="qcanvas.html#width">width</a>()-logoimg-><a href="qimage.html#width">width</a>()), + rand()%(canvas.<a href="qcanvas.html#height">height</a>()-logoimg-><a href="qimage.html#width">width</a>())); + i-><a href="qcanvasitem.html#setZ">setZ</a>(rand()%256+256); + i-><a href="qcanvasitem.html#show">show</a>(); +} + + + +void <a name="f647"></a>Main::addCircle() +{ + <a href="qcanvaspolygonalitem.html">QCanvasPolygonalItem</a>* i = new <a href="qcanvasellipse.html">QCanvasEllipse</a>(50,50,&canvas); +<a name="x2923"></a> i-><a href="qcanvaspolygonalitem.html#setBrush">setBrush</a>( QColor(rand()%32*8,rand()%32*8,rand()%32*8) ); + i-><a href="qcanvasitem.html#move">move</a>(rand()%canvas.<a href="qcanvas.html#width">width</a>(),rand()%canvas.<a href="qcanvas.html#height">height</a>()); + i-><a href="qcanvasitem.html#setZ">setZ</a>(rand()%256); + i-><a href="qcanvasitem.html#show">show</a>(); +} + +void <a name="f648"></a>Main::addHexagon() +{ + <a href="qcanvaspolygon.html">QCanvasPolygon</a>* i = new <a href="qcanvaspolygon.html">QCanvasPolygon</a>(&canvas); + const int size = canvas.<a href="qcanvas.html#width">width</a>() / 25; + <a href="qpointarray.html">QPointArray</a> pa(6); + pa[0] = QPoint(2*size,0); + pa[1] = QPoint(size,-size*173/100); + pa[2] = QPoint(-size,-size*173/100); + pa[3] = QPoint(-2*size,0); + pa[4] = QPoint(-size,size*173/100); + pa[5] = QPoint(size,size*173/100); +<a name="x2922"></a> i-><a href="qcanvasline.html#setPoints">setPoints</a>(pa); + i-><a href="qcanvaspolygonalitem.html#setBrush">setBrush</a>( QColor(rand()%32*8,rand()%32*8,rand()%32*8) ); + i-><a href="qcanvasitem.html#move">move</a>(rand()%canvas.<a href="qcanvas.html#width">width</a>(),rand()%canvas.<a href="qcanvas.html#height">height</a>()); + i-><a href="qcanvasitem.html#setZ">setZ</a>(rand()%256); + i-><a href="qcanvasitem.html#show">show</a>(); +} + +void <a name="f649"></a>Main::addPolygon() +{ + <a href="qcanvaspolygon.html">QCanvasPolygon</a>* i = new <a href="qcanvaspolygon.html">QCanvasPolygon</a>(&canvas); + const int size = canvas.<a href="qcanvas.html#width">width</a>()/2; + <a href="qpointarray.html">QPointArray</a> pa(6); + pa[0] = QPoint(0,0); + pa[1] = QPoint(size,size/5); + pa[2] = QPoint(size*4/5,size); + pa[3] = QPoint(size/6,size*5/4); + pa[4] = QPoint(size*3/4,size*3/4); + pa[5] = QPoint(size*3/4,size/4); + i-><a href="qcanvasline.html#setPoints">setPoints</a>(pa); + i-><a href="qcanvaspolygonalitem.html#setBrush">setBrush</a>( QColor(rand()%32*8,rand()%32*8,rand()%32*8) ); + i-><a href="qcanvasitem.html#move">move</a>(rand()%canvas.<a href="qcanvas.html#width">width</a>(),rand()%canvas.<a href="qcanvas.html#height">height</a>()); + i-><a href="qcanvasitem.html#setZ">setZ</a>(rand()%256); + i-><a href="qcanvasitem.html#show">show</a>(); +} + +void <a name="f650"></a>Main::addSpline() +{ + <a href="qcanvasspline.html">QCanvasSpline</a>* i = new <a href="qcanvasspline.html">QCanvasSpline</a>(&canvas); + const int size = canvas.<a href="qcanvas.html#width">width</a>()/6; + <a href="qpointarray.html">QPointArray</a> pa(12); + pa[0] = QPoint(0,0); + pa[1] = QPoint(size/2,0); + pa[2] = QPoint(size,size/2); + pa[3] = QPoint(size,size); + pa[4] = QPoint(size,size*3/2); + pa[5] = QPoint(size/2,size*2); + pa[6] = QPoint(0,size*2); + pa[7] = QPoint(-size/2,size*2); + pa[8] = QPoint(size/4,size*3/2); + pa[9] = QPoint(0,size); + pa[10]= QPoint(-size/4,size/2); + pa[11]= QPoint(-size/2,0); +<a name="x2926"></a> i-><a href="qcanvasspline.html#setControlPoints">setControlPoints</a>(pa); + i-><a href="qcanvaspolygonalitem.html#setBrush">setBrush</a>( QColor(rand()%32*8,rand()%32*8,rand()%32*8) ); + i-><a href="qcanvasitem.html#move">move</a>(rand()%canvas.<a href="qcanvas.html#width">width</a>(),rand()%canvas.<a href="qcanvas.html#height">height</a>()); + i-><a href="qcanvasitem.html#setZ">setZ</a>(rand()%256); + i-><a href="qcanvasitem.html#show">show</a>(); +} + +void <a name="f651"></a>Main::addText() +{ + <a href="qcanvastext.html">QCanvasText</a>* i = new <a href="qcanvastext.html">QCanvasText</a>(&canvas); +<a name="x2929"></a> i-><a href="qcanvastext.html#setText">setText</a>("QCanvasText"); + i-><a href="qcanvasitem.html#move">move</a>(rand()%canvas.<a href="qcanvas.html#width">width</a>(),rand()%canvas.<a href="qcanvas.html#height">height</a>()); + i-><a href="qcanvasitem.html#setZ">setZ</a>(rand()%256); + i-><a href="qcanvasitem.html#show">show</a>(); +} + +void <a name="f652"></a>Main::addLine() +{ + <a href="qcanvasline.html">QCanvasLine</a>* i = new <a href="qcanvasline.html">QCanvasLine</a>(&canvas); + i-><a href="qcanvasline.html#setPoints">setPoints</a>( rand()%canvas.<a href="qcanvas.html#width">width</a>(), rand()%canvas.<a href="qcanvas.html#height">height</a>(), + rand()%canvas.<a href="qcanvas.html#width">width</a>(), rand()%canvas.<a href="qcanvas.html#height">height</a>() ); +<a name="x2924"></a> i-><a href="qcanvaspolygonalitem.html#setPen">setPen</a>( QPen(QColor(rand()%32*8,rand()%32*8,rand()%32*8), 6) ); + i-><a href="qcanvasitem.html#setZ">setZ</a>(rand()%256); + i-><a href="qcanvasitem.html#show">show</a>(); +} + +void <a name="f653"></a>Main::addMesh() +{ + int x0 = 0; + int y0 = 0; + + if ( !tb ) tb = new <a href="qbrush.html">QBrush</a>( Qt::red ); + if ( !tp ) tp = new <a href="qpen.html">QPen</a>( Qt::black ); + + int nodecount = 0; + + int w = canvas.<a href="qcanvas.html#width">width</a>(); + int h = canvas.<a href="qcanvas.html#height">height</a>(); + + const int dist = 30; + int rows = h / dist; + int cols = w / dist; + +#ifndef QT_NO_PROGRESSDIALOG + <a href="qprogressdialog.html">QProgressDialog</a> progress( "Creating mesh...", "Abort", rows, + this, "progress", TRUE ); +#endif + + <a href="qmemarray.html">QMemArray</a><NodeItem*> lastRow(cols); + for ( int j = 0; j < rows; j++ ) { + int n = j%2 ? cols-1 : cols; + NodeItem *prev = 0; + for ( int i = 0; i < n; i++ ) { + NodeItem *el = new NodeItem( &canvas ); + nodecount++; + int r = rand(); + int xrand = r %20; + int yrand = (r/20) %20; + el-><a href="qcanvasitem.html#move">move</a>( xrand + x0 + i*dist + (j%2 ? dist/2 : 0 ), + yrand + y0 + j*dist ); + + if ( j > 0 ) { + if ( i < cols-1 ) + (new EdgeItem( lastRow[i], el, &canvas ))->show(); + if ( j%2 ) + (new EdgeItem( lastRow[i+1], el, &canvas ))->show(); + else if ( i > 0 ) + (new EdgeItem( lastRow[i-1], el, &canvas ))->show(); + } + if ( prev ) { + (new EdgeItem( prev, el, &canvas ))->show(); + } + if ( i > 0 ) lastRow[i-1] = prev; + prev = el; + el-><a href="qcanvasitem.html#show">show</a>(); + } + lastRow[n-1]=prev; +#ifndef QT_NO_PROGRESSDIALOG +<a name="x2946"></a> progress.<a href="qprogressdialog.html#setProgress">setProgress</a>( j ); +<a name="x2947"></a> if ( progress.<a href="qprogressdialog.html#wasCancelled">wasCancelled</a>() ) + break; +#endif + } +#ifndef QT_NO_PROGRESSDIALOG + progress.<a href="qprogressdialog.html#setProgress">setProgress</a>( rows ); +#endif + // qDebug( "%d nodes, %d edges", nodecount, EdgeItem::count() ); +} + +void <a name="f654"></a>Main::addRectangle() +{ + <a href="qcanvaspolygonalitem.html">QCanvasPolygonalItem</a> *i = new <a href="qcanvasrectangle.html">QCanvasRectangle</a>( rand()%canvas.<a href="qcanvas.html#width">width</a>(),rand()%canvas.<a href="qcanvas.html#height">height</a>(), + canvas.<a href="qcanvas.html#width">width</a>()/5,canvas.<a href="qcanvas.html#width">width</a>()/5,&canvas); + int z = rand()%256; + i-><a href="qcanvaspolygonalitem.html#setBrush">setBrush</a>( QColor(z,z,z) ); + i-><a href="qcanvaspolygonalitem.html#setPen">setPen</a>( QPen(QColor(rand()%32*8,rand()%32*8,rand()%32*8), 6) ); + i-><a href="qcanvasitem.html#setZ">setZ</a>(z); + i-><a href="qcanvasitem.html#show">show</a>(); +} +</pre> + +<p> <hr> +<p> Main: +<p> <pre>#include <<a href="qstatusbar-h.html">qstatusbar.h</a>> +#include <<a href="qmessagebox-h.html">qmessagebox.h</a>> +#include <<a href="qmenubar-h.html">qmenubar.h</a>> +#include <<a href="qapplication-h.html">qapplication.h</a>> +#include <<a href="qimage-h.html">qimage.h</a>> + +#include "canvas.h" + +#include <stdlib.h> + +extern QString butterfly_fn; +extern QString logo_fn; + +int main(int argc, char** argv) +{ + <a href="qapplication.html">QApplication</a> app(argc,argv); + + if ( argc > 1 ) + butterfly_fn = argv[1]; + else + butterfly_fn = "butterfly.png"; + + if ( argc > 2 ) + logo_fn = argv[2]; + else + logo_fn = "qtlogo.png"; + + <a href="qcanvas.html">QCanvas</a> canvas(800,600); +<a name="x2962"></a> canvas.<a href="qcanvas.html#setAdvancePeriod">setAdvancePeriod</a>(30); + Main m(canvas); +<a name="x2969"></a> m.<a href="qwidget.html#resize">resize</a>(m.<a href="qwidget.html#sizeHint">sizeHint</a>()); + m.<a href="qwidget.html#setCaption">setCaption</a>("Qt Example - Canvas"); +<a name="x2970"></a><a name="x2958"></a> if ( QApplication::<a href="qapplication.html#desktop">desktop</a>()->width() > m.<a href="qwidget.html#width">width</a>() + 10 +<a name="x2964"></a> && QApplication::<a href="qapplication.html#desktop">desktop</a>()->height() > m.<a href="qwidget.html#height">height</a>() +30 ) + m.<a href="qwidget.html#show">show</a>(); + else +<a name="x2968"></a> m.<a href="qwidget.html#showMaximized">showMaximized</a>(); + + QObject::<a href="qobject.html#connect">connect</a>( qApp, SIGNAL(<a href="qapplication.html#lastWindowClosed">lastWindowClosed</a>()), qApp, SLOT(<a href="qapplication.html#quit">quit</a>()) ); + + return app.<a href="qapplication.html#exec">exec</a>(); +} + +</pre> + +<p>See also <a href="examples.html">Examples</a>. + +<!-- eof --> +<p><address><hr><div align=center> +<table width=100% cellspacing=0 border=0><tr> +<td>Copyright © 2007 +<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a> +<td align=right><div align=right>Qt 3.3.8</div> +</table></div></address></body> +</html> |