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main.cpp Example File
graphicsview/collidingmice/main.cpp

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 #include "mouse.h"

 #include <QtGui>

 #include <math.h>

 static const int MouseCount = 7;

 int main(int argc, char **argv)
 {
     QApplication app(argc, argv);
     qsrand(QTime(0,0,0).secsTo(QTime::currentTime()));

     QGraphicsScene scene;
     scene.setSceneRect(-300, -300, 600, 600);
     scene.setItemIndexMethod(QGraphicsScene::NoIndex);

     for (int i = 0; i < MouseCount; ++i) {
         Mouse *mouse = new Mouse;
         mouse->setPos(::sin((i * 6.28) / MouseCount) * 200,
                       ::cos((i * 6.28) / MouseCount) * 200);
         scene.addItem(mouse);
     }

     QGraphicsView view(&scene);
     view.setRenderHint(QPainter::Antialiasing);
     view.setBackgroundBrush(QPixmap(":/images/cheese.jpg"));
     view.setCacheMode(QGraphicsView::CacheBackground);
     view.setDragMode(QGraphicsView::ScrollHandDrag);
     view.setWindowTitle(QT_TRANSLATE_NOOP(QGraphicsView, "Colliding Mice"));
     view.resize(400, 300);
     view.show();

     return app.exec();
 }


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Qt 4.3.5