Qt 5.6 | Qt Widgets | Drag and Drop Robot Example | main.cpp Example File

Qt 5.6.2 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.
      **
      ** $QT_BEGIN_LICENSE:BSD$
      ** 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:
          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();
      }