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50
51#include <QtMath>
52#include <QtWidgets>
53
54#include "mouse.h"
55
56static constexpr int MouseCount = 7;
57
58//! [0]
59int main(int argc, char **argv)
60{
61#ifdef Q_OS_ANDROID
62 QApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
63#endif
64 QApplication app(argc, argv);
65//! [0]
66
67//! [1]
68 QGraphicsScene scene;
69 scene.setSceneRect(x: -300, y: -300, w: 600, h: 600);
70//! [1] //! [2]
71 scene.setItemIndexMethod(QGraphicsScene::NoIndex);
72//! [2]
73
74//! [3]
75 for (int i = 0; i < MouseCount; ++i) {
76 Mouse *mouse = new Mouse;
77 mouse->setPos(ax: ::sin(x: (i * 6.28) / MouseCount) * 200,
78 ay: ::cos(x: (i * 6.28) / MouseCount) * 200);
79 scene.addItem(item: mouse);
80 }
81//! [3]
82
83//! [4]
84 QGraphicsView view(&scene);
85 view.setRenderHint(hint: QPainter::Antialiasing);
86 view.setBackgroundBrush(QPixmap(":/images/cheese.jpg"));
87//! [4] //! [5]
88 view.setCacheMode(QGraphicsView::CacheBackground);
89 view.setViewportUpdateMode(QGraphicsView::BoundingRectViewportUpdate);
90 view.setDragMode(QGraphicsView::ScrollHandDrag);
91//! [5] //! [6]
92 view.setWindowTitle(QT_TRANSLATE_NOOP(QGraphicsView, "Colliding Mice"));
93 view.resize(w: 400, h: 300);
94 view.show();
95
96 QTimer timer;
97 QObject::connect(sender: &timer, signal: &QTimer::timeout, receiver: &scene, slot: &QGraphicsScene::advance);
98 timer.start(msec: 1000 / 33);
99
100 return app.exec();
101}
102//! [6]
103

source code of qtbase/examples/widgets/graphicsview/collidingmice/main.cpp