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diagramitem.h Example File
tools/undoframework/diagramitem.h

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 #ifndef DIAGRAMITEM_H
 #define DIAGRAMITEM_H

 #include <QGraphicsPolygonItem>

 class QGraphicsItem;
 class QGraphicsScene;
 class QGraphicsSceneMouseEvent;
 class QPointF;

 class DiagramItem : public QGraphicsPolygonItem
 {
 public:
     enum { Type = UserType + 1 };
     enum DiagramType { Box, Triangle };

     DiagramItem(DiagramType diagramType, QGraphicsItem *item = 0,
             QGraphicsScene *scene = 0);

     DiagramType diagramType() const {
         return polygon() == boxPolygon ? Box : Triangle;
     }
     int type() const { return Type; }

 private:
     QPolygonF boxPolygon;
     QPolygonF trianglePolygon;
 };

 #endif