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car.h Example File
dbus/remotecontrolledcar/car/car.h

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 #ifndef CAR_H
 #define CAR_H

 #include <QGraphicsItem>
 #include <QObject>
 #include <QBrush>

 class Car : public QObject, public QGraphicsItem
 {
     Q_OBJECT

 public:
     Car();
     QRectF boundingRect() const;

 public Q_SLOTS:
     void accelerate();
     void decelerate();
     void turnLeft();
     void turnRight();

 Q_SIGNALS:
     void crashed();

 protected:
     void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = 0);
     void timerEvent(QTimerEvent *event);

 private:
     QBrush color;
     qreal wheelsAngle; // used when applying rotation
     qreal speed; // delta movement along the body axis
 };

 #endif // CAR_H