Qt Reference Documentation

# main.cpp Example File

graphicsview/collidingmice/main.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
     ** Contact: http://www.qt-project.org/legal
     **
     ** This file is part of the examples of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:BSD$
     ** You may use this file under the terms of the BSD license as follows:
     **
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     ** modification, are permitted provided that the following conditions are
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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.setViewportUpdateMode(QGraphicsView::BoundingRectViewportUpdate);
         view.setDragMode(QGraphicsView::ScrollHandDrag);
         view.setWindowTitle(QT_TRANSLATE_NOOP(QGraphicsView, "Colliding Mice"));
     #if defined(Q_WS_S60) || defined(Q_WS_MAEMO_5) || defined(Q_WS_SIMULATOR)
         view.showMaximized();
     #else
         view.resize(400, 300);
         view.show();
     #endif

         QTimer timer;
         QObject::connect(&timer, SIGNAL(timeout()), &scene, SLOT(advance()));
         timer.start(1000 / 33);

         return app.exec();
     }