C++/Qt/QGraphicsView

QGraphicsView, QGraphicsItem and QGraphicsScene

<source lang="cpp"> Foundations of Qt Development\Chapter07\graphicsview\opengl\main.cpp /*

* Copyright (c) 2006-2007, Johan Thelin
* 
* All rights reserved.
* 
* Redistribution and use in source and binary forms, with or without modification, 
* are permitted provided that the following conditions are met:
* 
*     * Redistributions of source code must retain the above copyright notice, 
*       this list of conditions and the following disclaimer.
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*/

1. include <QApplication>
2. include <QGraphicsScene>
3. include <QGraphicsView>
4. include <QGraphicsRectItem>
5. include <QGLWidget>

QGraphicsItem *createItem( int x, QGraphicsScene *scene ) {

 QGraphicsRectItem *rectItem = new QGraphicsRectItem( QRect( x+40, 40, 120, 120 ), 0, scene );
 rectItem->setPen( QPen(Qt::black) );
 rectItem->setBrush( Qt::gray );
   
 QGraphicsRectItem *innerRectItem = new QGraphicsRectItem( QRect( x+50, 50, 45, 100 ), rectItem, scene );
 innerRectItem->setPen( QPen(Qt::black) );
 innerRectItem->setBrush( Qt::white );
 
 QGraphicsEllipseItem *ellipseItem = new QGraphicsEllipseItem( QRect( x+105, 50, 45, 100 ), rectItem, scene );
 ellipseItem->setPen( QPen(Qt::black) );
 ellipseItem->setBrush( Qt::white );
 return rectItem;

} int main( int argc, char **argv ) {

 QApplication app( argc, argv );
 
 QGraphicsScene scene( QRect( 0, 00, 1000, 200 ) );
 
 QGraphicsItem *item1 = createItem( 0, &scene );
 
 QGraphicsItem *item2 = createItem( 200, &scene );
 item2->translate( 300, 100 );
 item2->rotate( 30 );
 item2->translate( -300, -100 );
 
 QGraphicsItem *item3 = createItem( 400, &scene );
 item3->translate( 500, 100 );
 item3->scale( 0.5, 0.7 );
 item3->translate( -500, -100 );
 
 QGraphicsItem *item4 = createItem( 600, &scene );
 item4->translate( 700, 100 );
 item4->shear( 0.1, 0.3 );
 item4->translate( -700, -100 );
 
 QGraphicsItem *item5 = createItem( 800, &scene );
 item5->translate( 900, 100 );
 item5->scale( 0.5, 0.7 );
 item5->rotate( 30 );
 item5->shear( 0.1, 0.3 );
 item5->translate( -900, -100 );
 QGraphicsView view;
 view.setScene( &scene );
 view.setViewport( new QGLWidget() );
 view.show();
 
 return app.exec();

}

 </source>