- Qt 5.5
- Qt Widgets
- Drag and Drop Robot Example
- main.cpp Example File
- Qt 5.5.1 Reference Documentation

# main.cpp Example File

graphicsview/dragdroprobot/main.cpp

    /****************************************************************************
    **
    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
    **
    ** This file is part of the examples of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:BSD$
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    #include <QtWidgets>

    #include "coloritem.h"
    #include "robot.h"

    #include <math.h>

    class GraphicsView : public QGraphicsView
    {
    public:
        GraphicsView(QGraphicsScene *scene) : QGraphicsView(scene)
        {
        }

    protected:
        virtual void resizeEvent(QResizeEvent *) Q_DECL_OVERRIDE
        {
        }
    };

    int main(int argc, char **argv)
    {
        QApplication app(argc, argv);

        qsrand(QTime(0,0,0).secsTo(QTime::currentTime()));
        QGraphicsScene scene(-200, -200, 400, 400);

        for (int i = 0; i < 10; ++i) {
            ColorItem *item = new ColorItem;
            item->setPos(::sin((i * 6.28) / 10.0) * 150,
                         ::cos((i * 6.28) / 10.0) * 150);

            scene.addItem(item);
        }

        Robot *robot = new Robot;
        robot->setTransform(QTransform::fromScale(1.2, 1.2), true);
        robot->setPos(0, -20);
        scene.addItem(robot);
        GraphicsView view(&scene);
        view.setRenderHint(QPainter::Antialiasing);
        view.setViewportUpdateMode(QGraphicsView::BoundingRectViewportUpdate);
        view.setBackgroundBrush(QColor(230, 200, 167));
        view.setWindowTitle("Drag and Drop Robot");
         view.show();

        return app.exec();
    }