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arrow.h Example File
graphicsview/diagramscene/arrow.h

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 #ifndef ARROW_H
 #define ARROW_H

 #include <QGraphicsLineItem>

 #include "diagramitem.h"

 class QGraphicsPolygonItem;
 class QGraphicsLineItem;
 class QGraphicsScene;
 class QRectF;
 class QGraphicsSceneMouseEvent;
 class QPainterPath;

 class Arrow : public QGraphicsLineItem
 {
 public:
     enum { Type = UserType + 4 };

     Arrow(DiagramItem *startItem, DiagramItem *endItem,
       QGraphicsItem *parent = 0, QGraphicsScene *scene = 0);

     int type() const
         { return Type; }
     QRectF boundingRect() const;
     QPainterPath shape() const;
     void setColor(const QColor &color)
         { myColor = color; }
     DiagramItem *startItem() const
         { return myStartItem; }
     DiagramItem *endItem() const
         { return myEndItem; }

 public slots:
     void updatePosition();

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

 private:
     DiagramItem *myStartItem;
     DiagramItem *myEndItem;
     QColor myColor;
     QPolygonF arrowHead;
 };

 #endif