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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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Qt Toolkit - picture/picture.cpp example file
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<h1 align=center>Picture</h1><br clear="all">
This example shows how to make, store to file, and read a picture as
a set of drawing commands.
<hr>
Implementation:
<pre>/****************************************************************************
** $Id: qt/examples/picture/picture.cpp 2.3.2 edited 2001-10-18 $
**
** Copyright (C) 1992-2000 Trolltech AS. 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 name="qapplication.h"></a><a href="qapplication-h.html">qapplication.h</a>>
#include <<a name="qpainter.h"></a><a href="qpainter-h.html">qpainter.h</a>>
#include <<a name="qpicture.h"></a><a href="qpicture-h.html">qpicture.h</a>>
#include <<a name="qpixmap.h"></a><a href="qpixmap-h.html">qpixmap.h</a>>
#include <<a name="qwidget.h"></a><a href="qwidget-h.html">qwidget.h</a>>
#include <<a name="qmessagebox.h"></a><a href="qmessagebox-h.html">qmessagebox.h</a>>
#include <<a name="qfile.h"></a><a href="qfile-h.html">qfile.h</a>>
#include <ctype.h>
void paintCar( <a name="QPainter"></a><a href="qpainter.html">QPainter</a> *p ) // paint a car
{
<a name="QPointArray"></a><a href="qpointarray.html">QPointArray</a> a;
<a name="QBrush"></a><a href="qbrush.html">QBrush</a> brush( Qt::yellow, Qt::SolidPattern );
p-><a name="setBrush"></a><a href="qpainter.html#3e0cc8">setBrush</a>( brush ); // use solid, yellow brush
a.setPoints( 5, 50,50, 350,50, 450,120, 450,250, 50,250 );
p-><a name="drawPolygon"></a><a href="qpainter.html#2efe17">drawPolygon</a>( a ); // draw car body
<a name="QFont"></a><a href="qfont.html">QFont</a> f( "courier", 12, QFont::Bold );
p-><a name="setFont"></a><a href="qpainter.html#998df2">setFont</a>( f );
<a name="QColor"></a><a href="qcolor.html">QColor</a> windowColor( 120, 120, 255 ); // a light blue color
brush.<a name="setColor"></a><a href="qbrush.html#fdde27">setColor</a>( windowColor ); // set this brush color
p-><a href="qpainter.html#3e0cc8">setBrush</a>( brush ); // set brush
p-><a name="drawRect"></a><a href="qpainter.html#4c0077">drawRect</a>( 80, 80, 250, 70 ); // car window
p-><a name="drawText"></a><a href="qpainter.html#0f088f">drawText</a>( 180, 80, 150, 70, Qt::AlignCenter, "-- Qt --\nTrolltech AS" );
<a name="QPixmap"></a><a href="qpixmap.html">QPixmap</a> pixmap;
if ( pixmap.<a name="load"></a><a href="qpixmap.html#a728cf">load</a>("flag.bmp") ) // load and draw image
p-><a name="drawPixmap"></a><a href="qpainter.html#c64b89">drawPixmap</a>( 100, 85, pixmap );
p-><a name="setBackgroundMode"></a><a href="qpainter.html#10e1fd">setBackgroundMode</a>( Qt::OpaqueMode ); // set opaque mode
p-><a href="qpainter.html#3e0cc8">setBrush</a>( Qt::DiagCrossPattern ); // black diagonal cross pattern
p-><a name="drawEllipse"></a><a href="qpainter.html#f4ec3a">drawEllipse</a>( 90, 210, 80, 80 ); // back wheel
p-><a href="qpainter.html#3e0cc8">setBrush</a>( Qt::CrossPattern ); // black cross fill pattern
p-><a href="qpainter.html#f4ec3a">drawEllipse</a>( 310, 210, 80, 80 ); // front wheel
}
class PictureDisplay : public QWidget // picture display widget
{
public:
PictureDisplay( const char *fileName );
~PictureDisplay();
protected:
void paintEvent( <a name="QPaintEvent"></a><a href="qpaintevent.html">QPaintEvent</a> * );
void keyPressEvent( <a name="QKeyEvent"></a><a href="qkeyevent.html">QKeyEvent</a> * );
private:
<a name="QPicture"></a><a href="qpicture.html">QPicture</a> *pict;
<a name="QString"></a><a href="qstring.html">QString</a> name;
};
PictureDisplay::PictureDisplay( const char *fileName )
{
pict = new <a href="qpicture.html">QPicture</a>;
name = fileName;
if ( !pict-><a name="load"></a><a href="qpicture.html#f0cc08">load</a>(fileName) ) { // cannot load picture
delete pict;
pict = 0;
name.<a name="sprintf"></a><a href="qstring.html#926f67">sprintf</a>( "Not able to load picture: %s", fileName );
}
}
PictureDisplay::~PictureDisplay()
{
delete pict;
}
void <a name="369"></a>PictureDisplay::paintEvent( <a href="qpaintevent.html">QPaintEvent</a> * )
{
<a href="qpainter.html">QPainter</a> paint( this ); // paint widget
if ( pict )
paint.<a name="drawPicture"></a><a href="qpainter.html#de93a0">drawPicture</a>( *pict ); // draw picture
else
paint.<a href="qpainter.html#0f088f">drawText</a>( <a name="rect"></a><a href="qwidget.html#75ae71">rect</a>(), AlignCenter, name );
}
void <a name="370"></a>PictureDisplay::keyPressEvent( <a href="qkeyevent.html">QKeyEvent</a> *k )
{
switch ( tolower(k-><a name="ascii"></a><a href="qkeyevent.html#f0af69">ascii</a>()) ) {
case 'r': // reload
pict-><a href="qpicture.html#f0cc08">load</a>( name );
<a name="update"></a><a href="qwidget.html#a66a88">update</a>();
break;
case 'q': // quit
<a name="QApplication::exit"></a><a href="qapplication.html#7328f6">QApplication::exit</a>();
break;
}
}
int main( int argc, char **argv )
{
<a name="QApplication"></a><a href="qapplication.html">QApplication</a> a( argc, argv ); // QApplication required!
const char *fileName = "car.pic"; // default picture file name
if ( argc == 2 ) // use argument as file name
fileName = argv[1];
if ( !QFile::exists(fileName) ) {
<a href="qpicture.html">QPicture</a> pict; // our picture
<a href="qpainter.html">QPainter</a> paint; // our painter
paint.<a name="begin"></a><a href="qpainter.html#02ed5d">begin</a>( &pict ); // begin painting onto picture
paintCar( &paint ); // paint!
paint.<a name="end"></a><a href="qpainter.html#365784">end</a>(); // painting done
pict.<a name="save"></a><a href="qpicture.html#2d7ded">save</a>( fileName ); // save picture
<a name="QMessageBox::information"></a><a href="qmessagebox.html#66b7c8">QMessageBox::information</a>(0, "Qt picture example", "Saved. Run me again!");
return 0;
} else {
PictureDisplay test( fileName ); // create picture display
a.<a name="setMainWidget"></a><a href="qapplication.html#7ad759">setMainWidget</a>( &test); // set main widget
test.<a name="setCaption"></a><a href="qwidget.html#d6a291">setCaption</a>("Qt Example - Picture");
test.<a name="show"></a><a href="qwidget.html#200ee5">show</a>(); // show it
return a.<a name="exec"></a><a href="qapplication.html#84c7bf">exec</a>(); // start event loop
}
}
</pre>
<p><address><hr><div align="center">
<table width="100%" cellspacing="0" border="0"><tr>
<td>Copyright 2001 Trolltech<td><a href="http://www.trolltech.com/trademarks.html">Trademarks</a>
<td align="right"><div align="right">Qt version 2.3.2</div>
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