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mouse.h Example File
graphicsview/collidingmice/mouse.h

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 #ifndef MOUSE_H
 #define MOUSE_H

 #include <QGraphicsItem>
 #include <QObject>

 class Mouse : public QObject, public QGraphicsItem
 {
     Q_OBJECT

 public:
     Mouse();

     QRectF boundingRect() const;
     QPainterPath shape() const;
     void paint(QPainter *painter, const QStyleOptionGraphicsItem *option,
                QWidget *widget);

 protected:
     void timerEvent(QTimerEvent *event);

 private:
     qreal angle;
     qreal speed;
     qreal mouseEyeDirection;
     QColor color;
 };

 #endif