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++ // Copyright (C) 2016 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
++
++ #include <QtMath>
++ #include <QtWidgets>
++
++ #include "mouse.h"
++
++ static constexpr int MouseCount = 7;
++
++ //! [0]
++ int main(int argc, char **argv)
++ {
++ QApplication app(argc, argv);
++ //! [0]
++
++ //! [1]
++ QGraphicsScene scene;
++ scene.setSceneRect(-300, -300, 600, 600);
++ //! [1] //! [2]
++ scene.setItemIndexMethod(QGraphicsScene::NoIndex);
++ //! [2]
++
++ //! [3]
++ 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);
++ }
++ //! [3]
++
++ //! [4]
++ QGraphicsView view(&scene);
++ view.setRenderHint(QPainter::Antialiasing);
++ view.setBackgroundBrush(QPixmap(":/images/cheese.jpg"));
++ //! [4] //! [5]
++ view.setCacheMode(QGraphicsView::CacheBackground);
++ view.setViewportUpdateMode(QGraphicsView::BoundingRectViewportUpdate);
++ view.setDragMode(QGraphicsView::ScrollHandDrag);
++ //! [5] //! [6]
++ view.setWindowTitle(QT_TRANSLATE_NOOP(QGraphicsView, "Colliding Mice"));
++ view.resize(400, 300);
++ view.show();
++
++ QTimer timer;
++ QObject::connect(&timer, &QTimer::timeout, &scene, &QGraphicsScene::advance);
++ timer.start(1000 / 33);
++
++ return app.exec();
++ }
++ //! [6]