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183 lines
8.2 KiB
183 lines
8.2 KiB
14 years ago
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<!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/picture/picture.doc:4 -->
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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>Picture</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>Picture</h1>
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<p>
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This example shows how to make a picture, store it to a file, and read it as
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a set of drawing commands.
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<p> <hr>
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<p> Implementation:
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<p> <pre>/****************************************************************************
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** $Id: qt/picture.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 Qt. 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="qapplication-h.html">qapplication.h</a>>
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#include <<a href="qpainter-h.html">qpainter.h</a>>
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#include <<a href="qpicture-h.html">qpicture.h</a>>
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#include <<a href="qpixmap-h.html">qpixmap.h</a>>
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#include <<a href="qwidget-h.html">qwidget.h</a>>
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#include <<a href="qmessagebox-h.html">qmessagebox.h</a>>
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#include <<a href="qfile-h.html">qfile.h</a>>
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#include <ctype.h>
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void paintCar( <a href="qpainter.html">QPainter</a> *p ) // paint a car
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{
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<a href="qpointarray.html">QPointArray</a> a;
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<a href="qbrush.html">QBrush</a> brush( Qt::yellow, Qt::SolidPattern );
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<a name="x120"></a> p-><a href="qpainter.html#setBrush">setBrush</a>( brush ); // use solid, yellow brush
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<a name="x125"></a> a.setPoints( 5, 50,50, 350,50, 450,120, 450,250, 50,250 );
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<a name="x115"></a> p-><a href="qpainter.html#drawPolygon">drawPolygon</a>( a ); // draw car body
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<a href="qfont.html">QFont</a> f( "courier", 12, QFont::Bold );
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<a name="x121"></a> p-><a href="qpainter.html#setFont">setFont</a>( f );
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<a href="qcolor.html">QColor</a> windowColor( 120, 120, 255 ); // a light blue color
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<a name="x108"></a> brush.<a href="qbrush.html#setColor">setColor</a>( windowColor ); // set this brush color
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p-><a href="qpainter.html#setBrush">setBrush</a>( brush ); // set brush
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<a name="x116"></a> p-><a href="qpainter.html#drawRect">drawRect</a>( 80, 80, 250, 70 ); // car window
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<a name="x117"></a> p-><a href="qpainter.html#drawText">drawText</a>( 180, 80, 150, 70, Qt::AlignCenter, "-- Qt --\nTrolltech AS" );
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<a href="qpixmap.html">QPixmap</a> pixmap;
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<a name="x124"></a> if ( pixmap.<a href="qpixmap.html#load">load</a>("flag.bmp") ) // load and draw image
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<a name="x114"></a> p-><a href="qpainter.html#drawPixmap">drawPixmap</a>( 100, 85, pixmap );
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<a name="x119"></a> p-><a href="qpainter.html#setBackgroundMode">setBackgroundMode</a>( Qt::OpaqueMode ); // set opaque mode
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p-><a href="qpainter.html#setBrush">setBrush</a>( Qt::DiagCrossPattern ); // black diagonal cross pattern
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<a name="x112"></a> p-><a href="qpainter.html#drawEllipse">drawEllipse</a>( 90, 210, 80, 80 ); // back wheel
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p-><a href="qpainter.html#setBrush">setBrush</a>( Qt::CrossPattern ); // black cross fill pattern
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p-><a href="qpainter.html#drawEllipse">drawEllipse</a>( 310, 210, 80, 80 ); // front wheel
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}
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class PictureDisplay : public <a href="qwidget.html">QWidget</a> // picture display widget
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{
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public:
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PictureDisplay( const char *fileName );
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~PictureDisplay();
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protected:
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void paintEvent( <a href="qpaintevent.html">QPaintEvent</a> * );
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void keyPressEvent( <a href="qkeyevent.html">QKeyEvent</a> * );
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private:
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<a href="qpicture.html">QPicture</a> *pict;
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<a href="qstring.html">QString</a> name;
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};
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<a name="f207"></a>PictureDisplay::PictureDisplay( const char *fileName )
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{
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pict = new <a href="qpicture.html">QPicture</a>;
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name = fileName;
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<a name="x122"></a> if ( !pict-><a href="qpicture.html#load">load</a>(fileName) ) { // cannot load picture
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delete pict;
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pict = 0;
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name.<a href="qstring.html#sprintf">sprintf</a>( "Not able to load picture: %s", fileName );
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}
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}
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PictureDisplay::~PictureDisplay()
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{
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delete pict;
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}
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void PictureDisplay::<a href="qwidget.html#paintEvent">paintEvent</a>( <a href="qpaintevent.html">QPaintEvent</a> * )
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{
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<a href="qpainter.html">QPainter</a> paint( this ); // paint widget
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if ( pict )
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<a name="x113"></a> paint.<a href="qpainter.html#drawPicture">drawPicture</a>( *pict ); // draw picture
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else
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paint.<a href="qpainter.html#drawText">drawText</a>( <a href="qwidget.html#rect">rect</a>(), AlignCenter, name );
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}
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<a name="x127"></a>void PictureDisplay::<a href="qwidget.html#keyPressEvent">keyPressEvent</a>( <a href="qkeyevent.html">QKeyEvent</a> *k )
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{
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<a name="x109"></a> switch ( tolower(k-><a href="qkeyevent.html#ascii">ascii</a>()) ) {
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case 'r': // reload
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pict-><a href="qpicture.html#load">load</a>( name );
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<a href="qwidget.html#update">update</a>();
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break;
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case 'q': // quit
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<a name="x106"></a> QApplication::<a href="qapplication.html#exit">exit</a>();
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break;
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}
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}
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int main( int argc, char **argv )
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{
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<a href="qapplication.html">QApplication</a> a( argc, argv ); // QApplication required!
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const char *fileName = "car.pic"; // default picture file name
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if ( argc == 2 ) // use argument as file name
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fileName = argv[1];
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if ( !QFile::exists(fileName) ) {
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<a href="qpicture.html">QPicture</a> pict; // our picture
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<a href="qpainter.html">QPainter</a> paint; // our painter
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<a name="x111"></a> paint.<a href="qpainter.html#begin">begin</a>( &pict ); // begin painting onto picture
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paintCar( &paint ); // paint!
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<a name="x118"></a> paint.<a href="qpainter.html#end">end</a>(); // painting done
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<a name="x123"></a> pict.<a href="qpicture.html#save">save</a>( fileName ); // save picture
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<a name="x110"></a> QMessageBox::<a href="qmessagebox.html#information">information</a>(0, "Qt Example - Picture", "Saved. Run me again!");
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return 0;
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} else {
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PictureDisplay test( fileName ); // create picture display
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a.<a href="qapplication.html#setMainWidget">setMainWidget</a>( &test); // set main widget
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test.<a href="qwidget.html#setCaption">setCaption</a>("Qt Example - Picture");
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test.<a href="qwidget.html#show">show</a>(); // show it
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return a.<a href="qapplication.html#exec">exec</a>(); // start event loop
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}
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}
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</pre>
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<p>See also <a href="examples.html">Examples</a>.
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<!-- eof -->
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<p><address><hr><div align=center>
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<table width=100% cellspacing=0 border=0><tr>
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<td>Copyright © 2007
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<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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<td align=right><div align=right>Qt 3.3.8</div>
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</table></div></address></body>
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</html>
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