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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<title>Picture</title>
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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>Picture</h1>
<p>
This example shows how to make a picture, store it to a file, and read it as
a set of drawing commands.
<p> <hr>
<p> Implementation:
<p> <pre>/****************************************************************************
** $Id: qt/picture.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="qapplication-h.html">qapplication.h</a>>
#include <<a href="qpainter-h.html">qpainter.h</a>>
#include <<a href="qpicture-h.html">qpicture.h</a>>
#include <<a href="qpixmap-h.html">qpixmap.h</a>>
#include <<a href="qwidget-h.html">qwidget.h</a>>
#include <<a href="qmessagebox-h.html">qmessagebox.h</a>>
#include <<a href="qfile-h.html">qfile.h</a>>
#include <ctype.h>
void paintCar( <a href="qpainter.html">QPainter</a> *p ) // paint a car
{
<a href="qpointarray.html">QPointArray</a> a;
<a href="qbrush.html">QBrush</a> brush( Qt::yellow, Qt::SolidPattern );
<a name="x120"></a> p-><a href="qpainter.html#setBrush">setBrush</a>( brush ); // use solid, yellow brush
<a name="x125"></a> a.setPoints( 5, 50,50, 350,50, 450,120, 450,250, 50,250 );
<a name="x115"></a> p-><a href="qpainter.html#drawPolygon">drawPolygon</a>( a ); // draw car body
<a href="qfont.html">QFont</a> f( "courier", 12, QFont::Bold );
<a name="x121"></a> p-><a href="qpainter.html#setFont">setFont</a>( f );
<a href="qcolor.html">QColor</a> windowColor( 120, 120, 255 ); // a light blue color
<a name="x108"></a> brush.<a href="qbrush.html#setColor">setColor</a>( windowColor ); // set this brush color
p-><a href="qpainter.html#setBrush">setBrush</a>( brush ); // set brush
<a name="x116"></a> p-><a href="qpainter.html#drawRect">drawRect</a>( 80, 80, 250, 70 ); // car window
<a name="x117"></a> p-><a href="qpainter.html#drawText">drawText</a>( 180, 80, 150, 70, Qt::AlignCenter, "-- Qt --\nTrolltech AS" );
<a href="qpixmap.html">QPixmap</a> pixmap;
<a name="x124"></a> if ( pixmap.<a href="qpixmap.html#load">load</a>("flag.bmp") ) // load and draw image
<a name="x114"></a> p-><a href="qpainter.html#drawPixmap">drawPixmap</a>( 100, 85, pixmap );
<a name="x119"></a> p-><a href="qpainter.html#setBackgroundMode">setBackgroundMode</a>( Qt::OpaqueMode ); // set opaque mode
p-><a href="qpainter.html#setBrush">setBrush</a>( Qt::DiagCrossPattern ); // black diagonal cross pattern
<a name="x112"></a> p-><a href="qpainter.html#drawEllipse">drawEllipse</a>( 90, 210, 80, 80 ); // back wheel
p-><a href="qpainter.html#setBrush">setBrush</a>( Qt::CrossPattern ); // black cross fill pattern
p-><a href="qpainter.html#drawEllipse">drawEllipse</a>( 310, 210, 80, 80 ); // front wheel
}
class PictureDisplay : public <a href="qwidget.html">QWidget</a> // picture display widget
{
public:
PictureDisplay( const char *fileName );
~PictureDisplay();
protected:
void paintEvent( <a href="qpaintevent.html">QPaintEvent</a> * );
void keyPressEvent( <a href="qkeyevent.html">QKeyEvent</a> * );
private:
<a href="qpicture.html">QPicture</a> *pict;
<a href="qstring.html">QString</a> name;
};
<a name="f207"></a>PictureDisplay::PictureDisplay( const char *fileName )
{
pict = new <a href="qpicture.html">QPicture</a>;
name = fileName;
<a name="x122"></a> if ( !pict-><a href="qpicture.html#load">load</a>(fileName) ) { // cannot load picture
delete pict;
pict = 0;
name.<a href="qstring.html#sprintf">sprintf</a>( "Not able to load picture: %s", fileName );
}
}
PictureDisplay::~PictureDisplay()
{
delete pict;
}
void PictureDisplay::<a href="qwidget.html#paintEvent">paintEvent</a>( <a href="qpaintevent.html">QPaintEvent</a> * )
{
<a href="qpainter.html">QPainter</a> paint( this ); // paint widget
if ( pict )
<a name="x113"></a> paint.<a href="qpainter.html#drawPicture">drawPicture</a>( *pict ); // draw picture
else
paint.<a href="qpainter.html#drawText">drawText</a>( <a href="qwidget.html#rect">rect</a>(), AlignCenter, name );
}
<a name="x127"></a>void PictureDisplay::<a href="qwidget.html#keyPressEvent">keyPressEvent</a>( <a href="qkeyevent.html">QKeyEvent</a> *k )
{
<a name="x109"></a> switch ( tolower(k-><a href="qkeyevent.html#ascii">ascii</a>()) ) {
case 'r': // reload
pict-><a href="qpicture.html#load">load</a>( name );
<a href="qwidget.html#update">update</a>();
break;
case 'q': // quit
<a name="x106"></a> QApplication::<a href="qapplication.html#exit">exit</a>();
break;
}
}
int main( int argc, char **argv )
{
<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
<a name="x111"></a> paint.<a href="qpainter.html#begin">begin</a>( &pict ); // begin painting onto picture
paintCar( &paint ); // paint!
<a name="x118"></a> paint.<a href="qpainter.html#end">end</a>(); // painting done
<a name="x123"></a> pict.<a href="qpicture.html#save">save</a>( fileName ); // save picture
<a name="x110"></a> QMessageBox::<a href="qmessagebox.html#information">information</a>(0, "Qt Example - Picture", "Saved. Run me again!");
return 0;
} else {
PictureDisplay test( fileName ); // create picture display
a.<a href="qapplication.html#setMainWidget">setMainWidget</a>( &test); // set main widget
test.<a href="qwidget.html#setCaption">setCaption</a>("Qt Example - Picture");
test.<a href="qwidget.html#show">show</a>(); // show it
return a.<a href="qapplication.html#exec">exec</a>(); // start event loop
}
}
</pre>
<p>See also <a href="examples.html">Examples</a>.
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