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/****************************************************************************
**
** Copyright (C) 1992-2008 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 <qapplication.h>
#include <qpainter.h>
#include <qpicture.h>
#include <qpixmap.h>
#include <qwidget.h>
#include <qmessagebox.h>
#include <qfile.h>
#include <ctype.h>
void paintCar( QPainter *p ) // paint a car
{
QPointArray a;
QBrush brush( Qt::yellow, Qt::SolidPattern );
p->setBrush( brush ); // use solid, yellow brush
a.setPoints( 5, 50,50, 350,50, 450,120, 450,250, 50,250 );
p->drawPolygon( a ); // draw car body
QFont f( "courier", 12, QFont::Bold );
p->setFont( f );
QColor windowColor( 120, 120, 255 ); // a light blue color
brush.setColor( windowColor ); // set this brush color
p->setBrush( brush ); // set brush
p->drawRect( 80, 80, 250, 70 ); // car window
p->drawText( 180, 80, 150, 70, Qt::AlignCenter, "-- Qt --\nTrolltech AS" );
QPixmap pixmap;
if ( pixmap.load("flag.bmp") ) // load and draw image
p->drawPixmap( 100, 85, pixmap );
p->setBackgroundMode( Qt::OpaqueMode ); // set opaque mode
p->setBrush( Qt::DiagCrossPattern ); // black diagonal cross pattern
p->drawEllipse( 90, 210, 80, 80 ); // back wheel
p->setBrush( Qt::CrossPattern ); // black cross fill pattern
p->drawEllipse( 310, 210, 80, 80 ); // front wheel
}
class PictureDisplay : public QWidget // picture display widget
{
public:
PictureDisplay( const char *fileName );
~PictureDisplay();
protected:
void paintEvent( QPaintEvent * );
void keyPressEvent( QKeyEvent * );
private:
QPicture *pict;
QString name;
};
PictureDisplay::PictureDisplay( const char *fileName )
{
pict = new QPicture;
name = fileName;
if ( !pict->load(fileName) ) { // cannot load picture
delete pict;
pict = 0;
name.sprintf( "Not able to load picture: %s", fileName );
}
}
PictureDisplay::~PictureDisplay()
{
delete pict;
}
void PictureDisplay::paintEvent( QPaintEvent * )
{
QPainter paint( this ); // paint widget
if ( pict )
paint.drawPicture( *pict ); // draw picture
else
paint.drawText( rect(), AlignCenter, name );
}
void PictureDisplay::keyPressEvent( QKeyEvent *k )
{
switch ( tolower(k->ascii()) ) {
case 'r': // reload
pict->load( name );
update();
break;
case 'q': // quit
QApplication::exit();
break;
}
}
int main( int argc, char **argv )
{
QApplication 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) ) {
QPicture pict; // our picture
QPainter paint; // our painter
paint.begin( &pict ); // begin painting onto picture
paintCar( &paint ); // paint!
paint.end(); // painting done
pict.save( fileName ); // save picture
QMessageBox::information(0, "Qt Example - Picture", "Saved. Run me again!");
return 0;
} else {
PictureDisplay test( fileName ); // create picture display
a.setMainWidget( &test); // set main widget
test.setCaption("Qt Example - Picture");
test.show(); // show it
return a.exec(); // start event loop
}
}
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