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

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     #ifndef DIAGRAMITEM_H
     #define DIAGRAMITEM_H

     #include <QGraphicsPixmapItem>
     #include <QList>

     class QPixmap;
     class QGraphicsItem;
     class QGraphicsScene;
     class QTextEdit;
     class QGraphicsSceneMouseEvent;
     class QMenu;
     class QGraphicsSceneContextMenuEvent;
     class QPainter;
     class QStyleOptionGraphicsItem;
     class QWidget;
     class QPolygonF;
     class Arrow;

     class DiagramItem : public QGraphicsPolygonItem
     {
     public:
         enum { Type = UserType + 15 };
         enum DiagramType { Step, Conditional, StartEnd, Io };

         DiagramItem(DiagramType diagramType, QMenu *contextMenu,
             QGraphicsItem *parent = 0, QGraphicsScene *scene = 0);

         void removeArrow(Arrow *arrow);
         void removeArrows();
         DiagramType diagramType() const
             { return myDiagramType; }
         QPolygonF polygon() const
             { return myPolygon; }
         void addArrow(Arrow *arrow);
         QPixmap image() const;
         int type() const
             { return Type;}

     protected:
         void contextMenuEvent(QGraphicsSceneContextMenuEvent *event);
         QVariant itemChange(GraphicsItemChange change, const QVariant &value);

     private:
         DiagramType myDiagramType;
         QPolygonF myPolygon;
         QMenu *myContextMenu;
         QList<Arrow *> arrows;
     };

     #endif