qt5base-lts/examples/widgets/graphicsview/dragdroprobot/main.cpp

/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
**   * Redistributions of source code must retain the above copyright
**     notice, this list of conditions and the following disclaimer.
**   * Redistributions in binary form must reproduce the above copyright
**     notice, this list of conditions and the following disclaimer in
**     the documentation and/or other materials provided with the
**     distribution.
**   * Neither the name of The Qt Company Ltd nor the names of its
**     contributors may be used to endorse or promote products derived
**     from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include <QtWidgets>

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

#include <math.h>

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

protected:
    void resizeEvent(QResizeEvent *) override
    {
    }
};

//! [0]
int main(int argc, char **argv)
{
    QApplication app(argc, argv);

//! [0]
//! [1]
    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);
//! [1]
//! [2]
    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();
}
//! [2]