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diff --git a/doc/html/desktop-example.html b/doc/html/desktop-example.html new file mode 100644 index 0000000..cc054de --- /dev/null +++ b/doc/html/desktop-example.html @@ -0,0 +1,401 @@ +<!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 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>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 <<a href="qimage-h.html">qimage.h</a>> +#include <<a href="qbitmap-h.html">qbitmap.h</a>> +#include <<a href="qpainter-h.html">qpainter.h</a>> +#include <<a href="qapplication-h.html">qapplication.h</a>> +#include <<a href="qdropsite-h.html">qdropsite.h</a>> +#include <<a href="qdragobject-h.html">qdragobject.h</a>> +#include <stdio.h> + + +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()&0x7fff % velmax)/3 + velmin; + else + i = (kindaRand()&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-><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-><a href="qwidget.html#rect">rect</a>(); // desktop rectangle + + int i; + for ( i=0; i<maxcurves; i++ ) + a[i].resize( maxpoints ); + p = &a[0]; + for ( i=0; i<maxpoints; i++ ) { // setup first polygon points +<a name="x1756"></a> p->setPoint( i, (kindaRand()&0x7fff) % r.<a href="qrect.html#width">width</a>(), +<a name="x1749"></a> (kindaRand()&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<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 >= 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 = &a[head]; + if ( ++head >= maxcurves ) + head = 0; + for ( i=0; i<maxpoints; i++ ) { // calc new curve + p->point( i, &x, &y ); + x += xvel[i]; + y += yvel[i]; + if ( x >= maxx ) { + x = maxx - (x - maxx + 1); + xvel[i] = -velocity(i); + } + if ( x <= minx ) { + x = minx + (minx - x + 1); + xvel[i] = velocity(i); + } + if ( y >= maxy ) { + y = maxy - (y - maxy + 1); + yvel[i] = -velocity(i); + } + if ( y <= 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<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<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<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<=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-><a href="qwidget.html#setBackgroundPixmap">setBackgroundPixmap</a>( rpm ); // set desktop pixmap +<a name="x1763"></a> d-><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> &c1, const <a href="qcolor.html">QColor</a> &c2, const <a href="qcolor.html">QColor</a> &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 < pm-><a href="qpixmap.html#width">width</a>() ; i++ ) +<a name="x1743"></a> for( int j = 0 ; j < pm-><a href="qpixmap.html#height">height</a>() ; j++ ) { + int r = kindaRand(); + if ( r < KINDA_RAND_MAX / 3 ) +<a name="x1741"></a> p.<a href="qpainter.html#setPen">setPen</a>( p1 ); + else if ( r < 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> &topColor, const <a href="qcolor.html">QColor</a> &bottomColor, + int sw = 2 ) +{ +<a name="x1739"></a> if ( !p-><a href="qpainter.html#isActive">isActive</a>() ) + return; + + p-><a href="qpainter.html#setPen">setPen</a>( bottomColor ); +<a name="x1736"></a> p-><a href="qpainter.html#drawText">drawText</a>( x+sw, y+sw, text ); + p-><a href="qpainter.html#setPen">setPen</a>( topColor ); + p-><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-><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-><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>( &offscreen ); +<a name="x1758"></a><a name="x1757"></a> drawShadeText( &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, &offscreen ); +} + +void desktopWidget( const char *s = "Trolltech" ) +{ + DesktopWidget *t = new DesktopWidget(s); + t-><a href="qwidget.html#update">update</a>(); + qApp-><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-><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>( &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-><a href="qapplication.html#desktop">desktop</a>()->width(); + int appHeight = qApp-><a href="qapplication.html#desktop">desktop</a>()->height(); + if ( r.<a href="qrect.html#width">width</a>() > 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>() > 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( &pm, c1, c2, c3 ); + p.<a href="qpainter.html#begin">begin</a>( &pm ); + drawShadeText( &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-><a href="qapplication.html#desktop">desktop</a>()->setBackgroundPixmap( pm ); +} + +// +// The program starts here. +// + +int main( int argc, char **argv ) +{ + <a href="qapplication.html">QApplication</a> app( argc, argv ); + + if ( argc > 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 <text>" + "\n\tdesktop -shadewidget <text>\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 © 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> |