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50
51#include <QApplication>
52#include <QGraphicsScene>
53#include <QGraphicsView>
54
55#include "coloritem.h"
56#include "robot.h"
57
58#include <cmath>
59
60
61class GraphicsView : public QGraphicsView
62{
63public:
64 using QGraphicsView::QGraphicsView;
65
66protected:
67 void resizeEvent(QResizeEvent *) override
68 {
69 }
70};
71
72//! [0]
73int main(int argc, char **argv)
74{
75 QApplication app(argc, argv);
76
77//! [0]
78//! [1]
79 QGraphicsScene scene(-200, -200, 400, 400);
80
81 for (int i = 0; i < 10; ++i) {
82 ColorItem *item = new ColorItem;
83 item->setPos(ax: ::sin(x: (i * 6.28) / 10.0) * 150,
84 ay: ::cos(x: (i * 6.28) / 10.0) * 150);
85
86 scene.addItem(item);
87 }
88
89 Robot *robot = new Robot;
90 robot->setTransform(matrix: QTransform::fromScale(dx: 1.2, dy: 1.2), combine: true);
91 robot->setPos(ax: 0, ay: -20);
92 scene.addItem(item: robot);
93//! [1]
94//! [2]
95 GraphicsView view(&scene);
96 view.setRenderHint(hint: QPainter::Antialiasing);
97 view.setViewportUpdateMode(QGraphicsView::BoundingRectViewportUpdate);
98 view.setBackgroundBrush(QColor(230, 200, 167));
99 view.setWindowTitle("Drag and Drop Robot");
100 view.show();
101
102 return app.exec();
103}
104//! [2]
105

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