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# diagramitem.cpp Example File
tools/undoframework/diagramitem.cpp

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     #include <QtGui>

     #include "diagramitem.h"

     DiagramItem::DiagramItem(DiagramType diagramType, QGraphicsItem *item,
                              QGraphicsScene *scene)
         : QGraphicsPolygonItem(item, scene)
     {
         if (diagramType == Box) {
             boxPolygon << QPointF(0, 0) << QPointF(0, 30) << QPointF(30, 30)
                        << QPointF(30, 0) << QPointF(0, 0);
             setPolygon(boxPolygon);
         } else {
             trianglePolygon << QPointF(15, 0) << QPointF(30, 30) << QPointF(0, 30)
                             << QPointF(15, 0);
             setPolygon(trianglePolygon);
         }

         QColor color(qrand() % 256, qrand() % 256, qrand() % 256);
         QBrush brush(color);
         setBrush(brush);
         setFlag(QGraphicsItem::ItemIsSelectable);
         setFlag(QGraphicsItem::ItemIsMovable);
     }