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+<!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/desktop/desktop.doc:5 -->
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
+<title>Painting on the Desktop</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&nbsp;Classes</font></a>
+ | <a href="mainclasses.html">
+<font color="#004faf">Main&nbsp;Classes</font></a>
+ | <a href="annotated.html">
+<font color="#004faf">Annotated</font></a>
+ | <a href="groups.html">
+<font color="#004faf">Grouped&nbsp;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>Painting on the Desktop</h1>
+
+
+<p>
+The desktop demo contains three routines, each of which draws
+something on the desktop. It does some nice stuff with <a href="qpainter.html">QPainter</a>,
+and also demonstrates how one can treat the desktop as a widget like
+any other.
+<p> <hr>
+<p> Implementation:
+<p> <pre>/****************************************************************************
+** $Id: qt/desktop.cpp 3.3.8 edited Jan 11 14:37 $
+**
+** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
+**
+** This file is part of an example program for Qt. This example
+** program may be used, distributed and modified without limitation.
+**
+*****************************************************************************/
+
+#include &lt;<a href="qimage-h.html">qimage.h</a>&gt;
+#include &lt;<a href="qbitmap-h.html">qbitmap.h</a>&gt;
+#include &lt;<a href="qpainter-h.html">qpainter.h</a>&gt;
+#include &lt;<a href="qapplication-h.html">qapplication.h</a>&gt;
+#include &lt;<a href="qdropsite-h.html">qdropsite.h</a>&gt;
+#include &lt;<a href="qdragobject-h.html">qdragobject.h</a>&gt;
+#include &lt;stdio.h&gt;
+
+
+static double seed = 0.353535353535;
+static const int KINDA_RAND_MAX = 32767;
+
+static int kindaRand()
+{
+ seed = seed*147;
+ seed = seed - (double) ((int) seed);
+ return (int) ( seed*(KINDA_RAND_MAX + 1) );
+}
+
+static int velocity( int i ) // change velocity
+{
+ const int velmax = 15;
+ const int velmin = 4;
+ if ( i == 1 || i == 2 )
+ i = (kindaRand()&amp;0x7fff % velmax)/3 + velmin;
+ else
+ i = (kindaRand()&amp;0x7fff % velmax) + velmin;
+ return i;
+}
+
+//
+// Draw polygon on desktop.
+//
+
+void poly()
+{
+<a name="x1721"></a> <a href="qwidget.html">QWidget</a> *d = QApplication::<a href="qapplication.html#desktop">desktop</a>();
+<a name="x1761"></a> d-&gt;<a href="qwidget.html#setBackgroundColor">setBackgroundColor</a>( Qt::white ); // white desktop
+
+ const int maxpoints = 5;
+ const int maxcurves = 8;
+ static int xvel[maxpoints];
+ static int yvel[maxpoints];
+ int head = 0;
+ int tail = -maxcurves + 2;
+ <a href="qpointarray.html">QPointArray</a> *a = new <a href="qpointarray.html">QPointArray</a>[ maxcurves ];
+ register QPointArray *p;
+<a name="x1760"></a> <a href="qrect.html">QRect</a> r = d-&gt;<a href="qwidget.html#rect">rect</a>(); // desktop rectangle
+
+ int i;
+ for ( i=0; i&lt;maxcurves; i++ )
+ a[i].resize( maxpoints );
+ p = &amp;a[0];
+ for ( i=0; i&lt;maxpoints; i++ ) { // setup first polygon points
+<a name="x1756"></a> p-&gt;setPoint( i, (kindaRand()&amp;0x7fff) % r.<a href="qrect.html#width">width</a>(),
+<a name="x1749"></a> (kindaRand()&amp;0x7fff) % r.<a href="qrect.html#height">height</a>() );
+ xvel[i] = velocity(i);
+ yvel[i] = velocity(i);
+ }
+
+ <a href="qpainter.html">QPainter</a> paint;
+<a name="x1733"></a> paint.<a href="qpainter.html#begin">begin</a>( d ); // start painting desktop
+
+ for ( int ntimes=0; ntimes&lt;2000; ntimes++ ) {
+ paint.<a href="qpainter.html#setBrush">setBrush</a>( QColor(kindaRand()%360, 180, 255, QColor::Hsv) );
+<a name="x1735"></a> paint.<a href="qpainter.html#drawPolygon">drawPolygon</a>( a[head] );
+ if ( ++tail &gt;= maxcurves )
+ tail = 0;
+
+<a name="x1751"></a><a name="x1750"></a> int minx=r.<a href="qrect.html#left">left</a>(), maxx=r.<a href="qrect.html#right">right</a>();
+<a name="x1755"></a><a name="x1748"></a> int miny=r.<a href="qrect.html#top">top</a>(), maxy=r.<a href="qrect.html#bottom">bottom</a>();
+ int x, y;
+ p = &amp;a[head];
+ if ( ++head &gt;= maxcurves )
+ head = 0;
+ for ( i=0; i&lt;maxpoints; i++ ) { // calc new curve
+ p-&gt;point( i, &amp;x, &amp;y );
+ x += xvel[i];
+ y += yvel[i];
+ if ( x &gt;= maxx ) {
+ x = maxx - (x - maxx + 1);
+ xvel[i] = -velocity(i);
+ }
+ if ( x &lt;= minx ) {
+ x = minx + (minx - x + 1);
+ xvel[i] = velocity(i);
+ }
+ if ( y &gt;= maxy ) {
+ y = maxy - (y - maxy + 1);
+ yvel[i] = -velocity(i);
+ }
+ if ( y &lt;= miny ) {
+ y = miny + (miny - y + 1);
+ yvel[i] = velocity(i);
+ }
+ a[head].setPoint( i, x, y );
+ }
+ }
+<a name="x1737"></a> paint.<a href="qpainter.html#end">end</a>(); // painting done
+ delete[] a;
+}
+
+
+//
+// Rotate pattern on desktop.
+//
+
+void rotate()
+{
+ int i;
+ const int w = 64;
+ const int h = 64;
+ <a href="qimage.html">QImage</a> image( w, h, 8, 128 ); // create image
+ for ( i=0; i&lt;128; i++ ) // build color table
+<a name="x1730"></a> image.<a href="qimage.html#setColor">setColor</a>( i, qRgb(i,0,0) );
+ for ( int y=0; y&lt;h; y++ ) { // set image pixels
+<a name="x1729"></a> uchar *p = image.<a href="qimage.html#scanLine">scanLine</a>(y);
+ for ( int x=0; x&lt;w; x++ )
+ *p++ = (x+y)%128;
+ }
+
+ <a href="qpixmap.html">QPixmap</a> pm;
+ pm = image; // convert image to pixmap
+<a name="x1745"></a> pm.<a href="qpixmap.html#setOptimization">setOptimization</a>( QPixmap::BestOptim ); // rotation will be faster
+
+ <a href="qwidget.html">QWidget</a> *d = QApplication::<a href="qapplication.html#desktop">desktop</a>(); // w = desktop widget
+
+ for ( i=0; i&lt;=360; i += 2 ) {
+ <a href="qwmatrix.html">QWMatrix</a> m;
+<a name="x1764"></a> m.<a href="qwmatrix.html#rotate">rotate</a>( i ); // rotate coordinate system
+<a name="x1747"></a> <a href="qpixmap.html">QPixmap</a> rpm = pm.<a href="qpixmap.html#xForm">xForm</a>( m ); // rpm = rotated pixmap
+<a name="x1762"></a> d-&gt;<a href="qwidget.html#setBackgroundPixmap">setBackgroundPixmap</a>( rpm ); // set desktop pixmap
+<a name="x1763"></a> d-&gt;<a href="qwidget.html#update">update</a>(); // repaint desktop
+ }
+}
+
+//
+// Generates a marble-like pattern in pm.
+//
+
+void generateStone( <a href="qpixmap.html">QPixmap</a> *pm,
+ const <a href="qcolor.html">QColor</a> &amp;c1, const <a href="qcolor.html">QColor</a> &amp;c2, const <a href="qcolor.html">QColor</a> &amp;c3 )
+{
+ <a href="qpainter.html">QPainter</a> p;
+ <a href="qpen.html">QPen</a> p1 ( c1, 0 );
+ <a href="qpen.html">QPen</a> p2 ( c2, 0 );
+ <a href="qpen.html">QPen</a> p3 ( c3, 0 );
+
+ p.<a href="qpainter.html#begin">begin</a>( pm );
+<a name="x1746"></a> for( int i = 0 ; i &lt; pm-&gt;<a href="qpixmap.html#width">width</a>() ; i++ )
+<a name="x1743"></a> for( int j = 0 ; j &lt; pm-&gt;<a href="qpixmap.html#height">height</a>() ; j++ ) {
+ int r = kindaRand();
+ if ( r &lt; KINDA_RAND_MAX / 3 )
+<a name="x1741"></a> p.<a href="qpainter.html#setPen">setPen</a>( p1 );
+ else if ( r &lt; KINDA_RAND_MAX / 3 * 2 )
+ p.<a href="qpainter.html#setPen">setPen</a>( p2 );
+ else
+ p.<a href="qpainter.html#setPen">setPen</a>( p3 );
+<a name="x1734"></a> p.<a href="qpainter.html#drawPoint">drawPoint</a>( i,j );
+ }
+ p.<a href="qpainter.html#end">end</a>();
+}
+
+void drawShadeText( <a href="qpainter.html">QPainter</a> *p, int x, int y, const char *text,
+ const <a href="qcolor.html">QColor</a> &amp;topColor, const <a href="qcolor.html">QColor</a> &amp;bottomColor,
+ int sw = 2 )
+{
+<a name="x1739"></a> if ( !p-&gt;<a href="qpainter.html#isActive">isActive</a>() )
+ return;
+
+ p-&gt;<a href="qpainter.html#setPen">setPen</a>( bottomColor );
+<a name="x1736"></a> p-&gt;<a href="qpainter.html#drawText">drawText</a>( x+sw, y+sw, text );
+ p-&gt;<a href="qpainter.html#setPen">setPen</a>( topColor );
+ p-&gt;<a href="qpainter.html#drawText">drawText</a>( x, y, text );
+}
+
+// NOTE: desktop drag/drop is experimental
+
+class DesktopWidget : public <a href="qwidget.html">QWidget</a>, private QDropSite
+{
+public:
+ DesktopWidget( const char *s, QWidget *parent=0, const char *name=0 );
+ ~DesktopWidget();
+ void paintEvent( <a href="qpaintevent.html">QPaintEvent</a> * );
+
+ void dragEnterEvent( <a href="qdragenterevent.html">QDragEnterEvent</a> *e )
+ {
+<a name="x1731"></a> if ( QImageDrag::<a href="qimagedrag.html#canDecode">canDecode</a>(e) )
+<a name="x1727"></a> e-&gt;<a href="qdragmoveevent.html#accept">accept</a>();
+ }
+
+ void dragLeaveEvent( <a href="qdragleaveevent.html">QDragLeaveEvent</a> * )
+ {
+ }
+
+ void dragMoveEvent( <a href="qdragmoveevent.html">QDragMoveEvent</a> *e )
+ {
+ e-&gt;<a href="qdragmoveevent.html#accept">accept</a>();
+ }
+
+ void dropEvent( <a href="qdropevent.html">QDropEvent</a> * e )
+ {
+ <a href="qpixmap.html">QPixmap</a> pmp;
+<a name="x1732"></a> if ( QImageDrag::<a href="qimagedrag.html#decode">decode</a>( e, pmp ) ) {
+ <a href="qwidget.html#setBackgroundPixmap">setBackgroundPixmap</a>( pmp );
+ <a href="qwidget.html#update">update</a>();
+ }
+ }
+
+private:
+ <a href="qpixmap.html">QPixmap</a> *pm;
+ <a href="qstring.html">QString</a> text;
+};
+
+<a name="f483"></a>DesktopWidget::DesktopWidget( const char *s, QWidget *parent, const char *name )
+ : <a href="qwidget.html">QWidget</a>( parent, name, WType_Desktop | WPaintDesktop),
+ QDropSite(this)
+{
+ text = s;
+ pm = 0;
+}
+
+DesktopWidget::~DesktopWidget()
+{
+ delete pm;
+}
+
+void DesktopWidget::<a href="qwidget.html#paintEvent">paintEvent</a>( <a href="qpaintevent.html">QPaintEvent</a> * )
+{
+ <a href="qcolor.html">QColor</a> c1 = <a href="qwidget.html#backgroundColor">backgroundColor</a>();
+<a name="x1726"></a> <a href="qcolor.html">QColor</a> c2 = c1.<a href="qcolor.html#light">light</a>(104);
+<a name="x1725"></a> <a href="qcolor.html">QColor</a> c3 = c1.<a href="qcolor.html#dark">dark</a>(106);
+ if ( !pm ) {
+ pm = new <a href="qpixmap.html">QPixmap</a>( 64, 64 );
+ generateStone( pm, c1, c2, c3 );
+ <a href="qwidget.html#setBackgroundPixmap">setBackgroundPixmap</a>( *pm );
+ <a href="qwidget.html#update">update</a>();
+ }
+ <a href="qrect.html">QRect</a> br = <a href="qwidget.html#fontMetrics">fontMetrics</a>().boundingRect( text );
+ <a href="qpixmap.html">QPixmap</a> offscreen( br.<a href="qrect.html#width">width</a>(), br.<a href="qrect.html#height">height</a>() );
+ int x = <a href="qwidget.html#width">width</a>()/2 - br.<a href="qrect.html#width">width</a>()/2;
+ int y = <a href="qwidget.html#height">height</a>()/2 - br.<a href="qrect.html#height">height</a>()/2;
+<a name="x1742"></a> offscreen.<a href="qpixmap.html#fill">fill</a>( this, x, y );
+ <a href="qpainter.html">QPainter</a> p;
+ p.<a href="qpainter.html#begin">begin</a>( &amp;offscreen );
+<a name="x1758"></a><a name="x1757"></a> drawShadeText( &amp;p, -br.<a href="qrect.html#x">x</a>(), -br.<a href="qrect.html#y">y</a>(), text, c2, c3, 3 );
+ p.<a href="qpainter.html#end">end</a>();
+ <a href="qimage.html#bitBlt">bitBlt</a>( this, x, y, &amp;offscreen );
+}
+
+void desktopWidget( const char *s = "Trolltech" )
+{
+ DesktopWidget *t = new DesktopWidget(s);
+ t-&gt;<a href="qwidget.html#update">update</a>();
+ qApp-&gt;<a href="qapplication.html#exec">exec</a>();
+ delete t;
+}
+
+void desktopText( const char *s = "Trolltech" )
+{
+ const int border = 20;
+
+<a name="x1723"></a> <a href="qcolor.html">QColor</a> c1 = qApp-&gt;<a href="qapplication.html#palette">palette</a>().inactive().background();
+ <a href="qcolor.html">QColor</a> c2 = c1.<a href="qcolor.html#light">light</a>(104);
+ <a href="qcolor.html">QColor</a> c3 = c1.<a href="qcolor.html#dark">dark</a>(106);
+
+ <a href="qpixmap.html">QPixmap</a> pm(10,10);
+
+ <a href="qpainter.html">QPainter</a> p;
+ p.<a href="qpainter.html#begin">begin</a>( &amp;pm );
+<a name="x1738"></a> <a href="qrect.html">QRect</a> r = p.<a href="qpainter.html#fontMetrics">fontMetrics</a>().boundingRect( s );
+ p.<a href="qpainter.html#end">end</a>();
+
+ int appWidth = qApp-&gt;<a href="qapplication.html#desktop">desktop</a>()-&gt;width();
+ int appHeight = qApp-&gt;<a href="qapplication.html#desktop">desktop</a>()-&gt;height();
+ if ( r.<a href="qrect.html#width">width</a>() &gt; appWidth - border*2 )
+<a name="x1753"></a> r.<a href="qrect.html#setWidth">setWidth</a>( appWidth - border*2 );
+ if ( r.<a href="qrect.html#height">height</a>() &gt; appHeight - border*2 )
+<a name="x1752"></a> r.<a href="qrect.html#setHeight">setHeight</a>( appHeight - border*2 );
+
+<a name="x1754"></a><a name="x1744"></a> pm.<a href="qpixmap.html#resize">resize</a>( r.<a href="qrect.html#size">size</a>() + QSize( border*2, border*2 ) );
+ generateStone( &amp;pm, c1, c2, c3 );
+ p.<a href="qpainter.html#begin">begin</a>( &amp;pm );
+ drawShadeText( &amp;p, -r.<a href="qrect.html#x">x</a>() + border, -r.<a href="qrect.html#y">y</a>() + border, s, c2, c3 );
+ p.<a href="qpainter.html#end">end</a>();
+
+ qApp-&gt;<a href="qapplication.html#desktop">desktop</a>()-&gt;setBackgroundPixmap( pm );
+}
+
+//
+// The program starts here.
+//
+
+int main( int argc, char **argv )
+{
+ <a href="qapplication.html">QApplication</a> app( argc, argv );
+
+ if ( argc &gt; 1 ) {
+ <a href="qfont.html">QFont</a> f( "charter", 96, QFont::Black );
+<a name="x1728"></a> f.<a href="qfont.html#setStyleHint">setStyleHint</a>( QFont::Times );
+<a name="x1724"></a> app.<a href="qapplication.html#setFont">setFont</a>( f );
+ }
+
+ bool validOptions = FALSE;
+
+ if ( argc == 2 ) {
+ validOptions = TRUE;
+ if ( strcmp(argv[1],"-poly") == 0 )
+ poly();
+ else if ( strcmp(argv[1],"-rotate") == 0 )
+ rotate();
+ else if ( strcmp(argv[1],"-troll") == 0 )
+ desktopText();
+ else if ( strcmp(argv[1],"-trollwidget") == 0 )
+ desktopWidget();
+ else
+ validOptions = FALSE;
+ }
+ if ( argc == 3 ) {
+ validOptions = TRUE;
+ if ( strcmp(argv[1],"-shadetext") == 0 )
+ desktopText( argv[2] );
+ else if ( strcmp(argv[1],"-shadewidget") == 0 )
+ desktopWidget( argv[2] );
+ else
+ validOptions = FALSE;
+ }
+ if ( !validOptions ) {
+ fprintf( stderr, "Usage:\n\tdesktop -poly"
+ "\n\tdesktop -rotate"
+ "\n\tdesktop -troll"
+ "\n\tdesktop -trollwidget"
+ "\n\tdesktop -shadetext &lt;text&gt;"
+ "\n\tdesktop -shadewidget &lt;text&gt;\n" );
+ rotate();
+ }
+ return 0;
+}
+</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 &copy; 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>