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402 lines
17 KiB
402 lines
17 KiB
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/examples/desktop/desktop.doc:5 -->
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>Painting on the Desktop</title>
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<style type="text/css"><!--
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fn { margin-left: 1cm; text-indent: -1cm; }
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a:link { color: #004faf; text-decoration: none }
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a:visited { color: #672967; text-decoration: none }
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body { background: #ffffff; color: black; }
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--></style>
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</head>
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<body>
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<table border="0" cellpadding="0" cellspacing="0" width="100%">
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<tr bgcolor="#E5E5E5">
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<td valign=center>
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<a href="index.html">
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<font color="#004faf">Home</font></a>
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| <a href="classes.html">
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<font color="#004faf">All Classes</font></a>
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| <a href="mainclasses.html">
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<font color="#004faf">Main Classes</font></a>
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| <a href="annotated.html">
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<font color="#004faf">Annotated</font></a>
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| <a href="groups.html">
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<font color="#004faf">Grouped Classes</font></a>
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| <a href="functions.html">
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<font color="#004faf">Functions</font></a>
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</td>
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<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>
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<p>
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The desktop demo contains three routines, each of which draws
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something on the desktop. It does some nice stuff with <a href="ntqpainter.html">TQPainter</a>,
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and also demonstrates how one can treat the desktop as a widget like
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any other.
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<p> <hr>
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<p> Implementation:
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<p> <pre>/****************************************************************************
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** $Id: qt/desktop.cpp 3.3.8 edited Jan 11 14:37 $
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**
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** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
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**
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** This file is part of an example program for TQt. This example
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** program may be used, distributed and modified without limitation.
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**
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*****************************************************************************/
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#include <<a href="qimage-h.html">ntqimage.h</a>>
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#include <<a href="qbitmap-h.html">ntqbitmap.h</a>>
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#include <<a href="qpainter-h.html">ntqpainter.h</a>>
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#include <<a href="qapplication-h.html">ntqapplication.h</a>>
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#include <<a href="qdropsite-h.html">ntqdropsite.h</a>>
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#include <<a href="qdragobject-h.html">ntqdragobject.h</a>>
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#include <stdio.h>
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static double seed = 0.353535353535;
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static const int KINDA_RAND_MAX = 32767;
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static int kindaRand()
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{
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seed = seed*147;
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seed = seed - (double) ((int) seed);
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return (int) ( seed*(KINDA_RAND_MAX + 1) );
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}
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static int velocity( int i ) // change velocity
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{
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const int velmax = 15;
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const int velmin = 4;
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if ( i == 1 || i == 2 )
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i = (kindaRand()&0x7fff % velmax)/3 + velmin;
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else
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i = (kindaRand()&0x7fff % velmax) + velmin;
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return i;
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}
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//
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// Draw polygon on desktop.
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//
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void poly()
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{
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<a name="x1721"></a> <a href="tqwidget.html">TQWidget</a> *d = TQApplication::<a href="ntqapplication.html#desktop">desktop</a>();
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<a name="x1761"></a> d-><a href="tqwidget.html#setBackgroundColor">setBackgroundColor</a>( TQt::white ); // white desktop
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const int maxpoints = 5;
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const int maxcurves = 8;
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static int xvel[maxpoints];
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static int yvel[maxpoints];
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int head = 0;
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int tail = -maxcurves + 2;
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<a href="ntqpointarray.html">TQPointArray</a> *a = new <a href="ntqpointarray.html">TQPointArray</a>[ maxcurves ];
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TQPointArray *p;
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<a name="x1760"></a> <a href="ntqrect.html">TQRect</a> r = d-><a href="tqwidget.html#rect">rect</a>(); // desktop rectangle
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int i;
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for ( i=0; i<maxcurves; i++ )
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a[i].resize( maxpoints );
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p = &a[0];
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for ( i=0; i<maxpoints; i++ ) { // setup first polygon points
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<a name="x1756"></a> p->setPoint( i, (kindaRand()&0x7fff) % r.<a href="ntqrect.html#width">width</a>(),
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<a name="x1749"></a> (kindaRand()&0x7fff) % r.<a href="ntqrect.html#height">height</a>() );
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xvel[i] = velocity(i);
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yvel[i] = velocity(i);
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}
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<a href="ntqpainter.html">TQPainter</a> paint;
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<a name="x1733"></a> paint.<a href="ntqpainter.html#begin">begin</a>( d ); // start painting desktop
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for ( int ntimes=0; ntimes<2000; ntimes++ ) {
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paint.<a href="ntqpainter.html#setBrush">setBrush</a>( TQColor(kindaRand()%360, 180, 255, TQColor::Hsv) );
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<a name="x1735"></a> paint.<a href="ntqpainter.html#drawPolygon">drawPolygon</a>( a[head] );
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if ( ++tail >= maxcurves )
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tail = 0;
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<a name="x1751"></a><a name="x1750"></a> int minx=r.<a href="ntqrect.html#left">left</a>(), maxx=r.<a href="ntqrect.html#right">right</a>();
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<a name="x1755"></a><a name="x1748"></a> int miny=r.<a href="ntqrect.html#top">top</a>(), maxy=r.<a href="ntqrect.html#bottom">bottom</a>();
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int x, y;
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p = &a[head];
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if ( ++head >= maxcurves )
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head = 0;
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for ( i=0; i<maxpoints; i++ ) { // calc new curve
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p->point( i, &x, &y );
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x += xvel[i];
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y += yvel[i];
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if ( x >= maxx ) {
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x = maxx - (x - maxx + 1);
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xvel[i] = -velocity(i);
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}
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if ( x <= minx ) {
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x = minx + (minx - x + 1);
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xvel[i] = velocity(i);
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}
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if ( y >= maxy ) {
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y = maxy - (y - maxy + 1);
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yvel[i] = -velocity(i);
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}
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if ( y <= miny ) {
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y = miny + (miny - y + 1);
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yvel[i] = velocity(i);
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}
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a[head].setPoint( i, x, y );
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}
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}
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<a name="x1737"></a> paint.<a href="ntqpainter.html#end">end</a>(); // painting done
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delete[] a;
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}
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//
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// Rotate pattern on desktop.
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//
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void rotate()
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{
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int i;
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const int w = 64;
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const int h = 64;
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<a href="ntqimage.html">TQImage</a> image( w, h, 8, 128 ); // create image
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for ( i=0; i<128; i++ ) // build color table
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<a name="x1730"></a> image.<a href="ntqimage.html#setColor">setColor</a>( i, tqRgb(i,0,0) );
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for ( int y=0; y<h; y++ ) { // set image pixels
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<a name="x1729"></a> uchar *p = image.<a href="ntqimage.html#scanLine">scanLine</a>(y);
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for ( int x=0; x<w; x++ )
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*p++ = (x+y)%128;
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}
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<a href="ntqpixmap.html">TQPixmap</a> pm;
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pm = image; // convert image to pixmap
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<a name="x1745"></a> pm.<a href="ntqpixmap.html#setOptimization">setOptimization</a>( TQPixmap::BestOptim ); // rotation will be faster
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<a href="tqwidget.html">TQWidget</a> *d = TQApplication::<a href="ntqapplication.html#desktop">desktop</a>(); // w = desktop widget
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for ( i=0; i<=360; i += 2 ) {
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<a href="ntqwmatrix.html">TQWMatrix</a> m;
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<a name="x1764"></a> m.<a href="ntqwmatrix.html#rotate">rotate</a>( i ); // rotate coordinate system
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<a name="x1747"></a> <a href="ntqpixmap.html">TQPixmap</a> rpm = pm.<a href="ntqpixmap.html#xForm">xForm</a>( m ); // rpm = rotated pixmap
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<a name="x1762"></a> d-><a href="tqwidget.html#setBackgroundPixmap">setBackgroundPixmap</a>( rpm ); // set desktop pixmap
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<a name="x1763"></a> d-><a href="tqwidget.html#update">update</a>(); // repaint desktop
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}
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}
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//
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// Generates a marble-like pattern in pm.
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//
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void generateStone( <a href="ntqpixmap.html">TQPixmap</a> *pm,
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const <a href="ntqcolor.html">TQColor</a> &c1, const <a href="ntqcolor.html">TQColor</a> &c2, const <a href="ntqcolor.html">TQColor</a> &c3 )
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{
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<a href="ntqpainter.html">TQPainter</a> p;
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<a href="ntqpen.html">TQPen</a> p1 ( c1, 0 );
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<a href="ntqpen.html">TQPen</a> p2 ( c2, 0 );
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<a href="ntqpen.html">TQPen</a> p3 ( c3, 0 );
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p.<a href="ntqpainter.html#begin">begin</a>( pm );
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<a name="x1746"></a> for( int i = 0 ; i < pm-><a href="ntqpixmap.html#width">width</a>() ; i++ )
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<a name="x1743"></a> for( int j = 0 ; j < pm-><a href="ntqpixmap.html#height">height</a>() ; j++ ) {
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int r = kindaRand();
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if ( r < KINDA_RAND_MAX / 3 )
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<a name="x1741"></a> p.<a href="ntqpainter.html#setPen">setPen</a>( p1 );
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else if ( r < KINDA_RAND_MAX / 3 * 2 )
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p.<a href="ntqpainter.html#setPen">setPen</a>( p2 );
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else
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p.<a href="ntqpainter.html#setPen">setPen</a>( p3 );
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<a name="x1734"></a> p.<a href="ntqpainter.html#drawPoint">drawPoint</a>( i,j );
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}
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p.<a href="ntqpainter.html#end">end</a>();
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}
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void drawShadeText( <a href="ntqpainter.html">TQPainter</a> *p, int x, int y, const char *text,
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const <a href="ntqcolor.html">TQColor</a> &topColor, const <a href="ntqcolor.html">TQColor</a> &bottomColor,
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int sw = 2 )
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{
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<a name="x1739"></a> if ( !p-><a href="ntqpainter.html#isActive">isActive</a>() )
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return;
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p-><a href="ntqpainter.html#setPen">setPen</a>( bottomColor );
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<a name="x1736"></a> p-><a href="ntqpainter.html#drawText">drawText</a>( x+sw, y+sw, text );
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p-><a href="ntqpainter.html#setPen">setPen</a>( topColor );
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p-><a href="ntqpainter.html#drawText">drawText</a>( x, y, text );
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}
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// NOTE: desktop drag/drop is experimental
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class DesktopWidget : public <a href="tqwidget.html">TQWidget</a>, private TQDropSite
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{
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public:
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DesktopWidget( const char *s, TQWidget *parent=0, const char *name=0 );
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~DesktopWidget();
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void paintEvent( <a href="qpaintevent.html">TQPaintEvent</a> * );
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void dragEnterEvent( <a href="qdragenterevent.html">TQDragEnterEvent</a> *e )
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{
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<a name="x1731"></a> if ( TQImageDrag::<a href="qimagedrag.html#canDecode">canDecode</a>(e) )
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<a name="x1727"></a> e-><a href="qdragmoveevent.html#accept">accept</a>();
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}
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void dragLeaveEvent( <a href="qdragleaveevent.html">TQDragLeaveEvent</a> * )
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{
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}
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void dragMoveEvent( <a href="qdragmoveevent.html">TQDragMoveEvent</a> *e )
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{
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e-><a href="qdragmoveevent.html#accept">accept</a>();
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}
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void dropEvent( <a href="qdropevent.html">TQDropEvent</a> * e )
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{
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<a href="ntqpixmap.html">TQPixmap</a> pmp;
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<a name="x1732"></a> if ( TQImageDrag::<a href="qimagedrag.html#decode">decode</a>( e, pmp ) ) {
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<a href="tqwidget.html#setBackgroundPixmap">setBackgroundPixmap</a>( pmp );
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<a href="tqwidget.html#update">update</a>();
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}
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}
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private:
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<a href="ntqpixmap.html">TQPixmap</a> *pm;
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<a href="ntqstring.html">TQString</a> text;
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};
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<a name="f483"></a>DesktopWidget::DesktopWidget( const char *s, TQWidget *parent, const char *name )
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: <a href="tqwidget.html">TQWidget</a>( parent, name, WType_Desktop | WPaintDesktop),
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TQDropSite(this)
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{
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text = s;
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pm = 0;
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}
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DesktopWidget::~DesktopWidget()
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{
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delete pm;
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}
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void DesktopWidget::<a href="tqwidget.html#paintEvent">paintEvent</a>( <a href="qpaintevent.html">TQPaintEvent</a> * )
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{
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<a href="ntqcolor.html">TQColor</a> c1 = <a href="tqwidget.html#backgroundColor">backgroundColor</a>();
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<a name="x1726"></a> <a href="ntqcolor.html">TQColor</a> c2 = c1.<a href="ntqcolor.html#light">light</a>(104);
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<a name="x1725"></a> <a href="ntqcolor.html">TQColor</a> c3 = c1.<a href="ntqcolor.html#dark">dark</a>(106);
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if ( !pm ) {
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pm = new <a href="ntqpixmap.html">TQPixmap</a>( 64, 64 );
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generateStone( pm, c1, c2, c3 );
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<a href="tqwidget.html#setBackgroundPixmap">setBackgroundPixmap</a>( *pm );
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<a href="tqwidget.html#update">update</a>();
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}
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<a href="ntqrect.html">TQRect</a> br = <a href="tqwidget.html#fontMetrics">fontMetrics</a>().boundingRect( text );
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<a href="ntqpixmap.html">TQPixmap</a> offscreen( br.<a href="ntqrect.html#width">width</a>(), br.<a href="ntqrect.html#height">height</a>() );
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int x = <a href="tqwidget.html#width">width</a>()/2 - br.<a href="ntqrect.html#width">width</a>()/2;
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int y = <a href="tqwidget.html#height">height</a>()/2 - br.<a href="ntqrect.html#height">height</a>()/2;
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<a name="x1742"></a> offscreen.<a href="ntqpixmap.html#fill">fill</a>( this, x, y );
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<a href="ntqpainter.html">TQPainter</a> p;
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p.<a href="ntqpainter.html#begin">begin</a>( &offscreen );
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<a name="x1758"></a><a name="x1757"></a> drawShadeText( &p, -br.<a href="ntqrect.html#x">x</a>(), -br.<a href="ntqrect.html#y">y</a>(), text, c2, c3, 3 );
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p.<a href="ntqpainter.html#end">end</a>();
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<a href="ntqimage.html#bitBlt">bitBlt</a>( this, x, y, &offscreen );
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}
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void desktopWidget( const char *s = "Trolltech" )
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{
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DesktopWidget *t = new DesktopWidget(s);
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t-><a href="tqwidget.html#update">update</a>();
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tqApp-><a href="ntqapplication.html#exec">exec</a>();
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delete t;
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}
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void desktopText( const char *s = "Trolltech" )
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{
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const int border = 20;
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<a name="x1723"></a> <a href="ntqcolor.html">TQColor</a> c1 = tqApp-><a href="ntqapplication.html#palette">palette</a>().inactive().background();
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<a href="ntqcolor.html">TQColor</a> c2 = c1.<a href="ntqcolor.html#light">light</a>(104);
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<a href="ntqcolor.html">TQColor</a> c3 = c1.<a href="ntqcolor.html#dark">dark</a>(106);
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<a href="ntqpixmap.html">TQPixmap</a> pm(10,10);
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<a href="ntqpainter.html">TQPainter</a> p;
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p.<a href="ntqpainter.html#begin">begin</a>( &pm );
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<a name="x1738"></a> <a href="ntqrect.html">TQRect</a> r = p.<a href="ntqpainter.html#fontMetrics">fontMetrics</a>().boundingRect( s );
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p.<a href="ntqpainter.html#end">end</a>();
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int appWidth = tqApp-><a href="ntqapplication.html#desktop">desktop</a>()->width();
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int appHeight = tqApp-><a href="ntqapplication.html#desktop">desktop</a>()->height();
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if ( r.<a href="ntqrect.html#width">width</a>() > appWidth - border*2 )
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<a name="x1753"></a> r.<a href="ntqrect.html#setWidth">setWidth</a>( appWidth - border*2 );
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if ( r.<a href="ntqrect.html#height">height</a>() > appHeight - border*2 )
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<a name="x1752"></a> r.<a href="ntqrect.html#setHeight">setHeight</a>( appHeight - border*2 );
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<a name="x1754"></a><a name="x1744"></a> pm.<a href="ntqpixmap.html#resize">resize</a>( r.<a href="ntqrect.html#size">size</a>() + TQSize( border*2, border*2 ) );
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generateStone( &pm, c1, c2, c3 );
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p.<a href="ntqpainter.html#begin">begin</a>( &pm );
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drawShadeText( &p, -r.<a href="ntqrect.html#x">x</a>() + border, -r.<a href="ntqrect.html#y">y</a>() + border, s, c2, c3 );
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p.<a href="ntqpainter.html#end">end</a>();
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tqApp-><a href="ntqapplication.html#desktop">desktop</a>()->setBackgroundPixmap( pm );
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}
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//
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// The program starts here.
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//
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int main( int argc, char **argv )
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{
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<a href="ntqapplication.html">TQApplication</a> app( argc, argv );
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if ( argc > 1 ) {
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<a href="ntqfont.html">TQFont</a> f( "charter", 96, TQFont::Black );
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<a name="x1728"></a> f.<a href="ntqfont.html#setStyleHint">setStyleHint</a>( TQFont::Times );
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<a name="x1724"></a> app.<a href="ntqapplication.html#setFont">setFont</a>( f );
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}
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bool validOptions = FALSE;
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if ( argc == 2 ) {
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validOptions = TRUE;
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if ( strcmp(argv[1],"-poly") == 0 )
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poly();
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else if ( strcmp(argv[1],"-rotate") == 0 )
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rotate();
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else if ( strcmp(argv[1],"-troll") == 0 )
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desktopText();
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else if ( strcmp(argv[1],"-trollwidget") == 0 )
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desktopWidget();
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else
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validOptions = FALSE;
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}
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if ( argc == 3 ) {
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validOptions = TRUE;
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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>TQt 3.3.8</div>
|
|
</table></div></address></body>
|
|
</html>
|