Qt 4.5: arrow.h Example File (graphicsview/diagramscene/arrow.h)

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

     /****************************************************************************
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     ** Contact: Qt Software Information (qt-info@nokia.com)
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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