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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 &lt;<a href="qapplication-h.html">qapplication.h</a>&gt;
#include &lt;<a href="qpainter-h.html">qpainter.h</a>&gt;
#include &lt;<a href="qpicture-h.html">qpicture.h</a>&gt;
#include &lt;<a href="qpixmap-h.html">qpixmap.h</a>&gt;
#include &lt;<a href="qwidget-h.html">qwidget.h</a>&gt;
#include &lt;<a href="qmessagebox-h.html">qmessagebox.h</a>&gt;
#include &lt;<a href="qfile-h.html">qfile.h</a>&gt;
#include &lt;ctype.h&gt;


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-&gt;<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-&gt;<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-&gt;<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-&gt;<a href="qpainter.html#setBrush">setBrush</a>( brush );                       // set brush
<a name="x116"></a>    p-&gt;<a href="qpainter.html#drawRect">drawRect</a>( 80, 80, 250, 70 );             // car window
<a name="x117"></a>    p-&gt;<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-&gt;<a href="qpainter.html#drawPixmap">drawPixmap</a>( 100, 85, pixmap );

<a name="x119"></a>    p-&gt;<a href="qpainter.html#setBackgroundMode">setBackgroundMode</a>( Qt::OpaqueMode );     // set opaque mode
    p-&gt;<a href="qpainter.html#setBrush">setBrush</a>( Qt::DiagCrossPattern );        // black diagonal cross pattern
<a name="x112"></a>    p-&gt;<a href="qpainter.html#drawEllipse">drawEllipse</a>( 90, 210, 80, 80 );          // back wheel
    p-&gt;<a href="qpainter.html#setBrush">setBrush</a>( Qt::CrossPattern );            // black cross fill pattern
    p-&gt;<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-&gt;<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-&gt;<a href="qkeyevent.html#ascii">ascii</a>()) ) {
        case 'r':                               // reload
            pict-&gt;<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>( &amp;pict );                   // begin painting onto picture
        paintCar( &amp;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>( &amp;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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