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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(static_cast<int>(qrand()) % 256,
         static_cast<int>(qrand()) % 256, static_cast<int>(qrand()) % 256);
     QBrush brush(color);
     setBrush(brush);
     setFlag(QGraphicsItem::ItemIsSelectable);
     setFlag(QGraphicsItem::ItemIsMovable);
 }


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Qt 4.3.5