main.cpp Example File

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

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

      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();
  }