Qt:Документация 4.3.2/graphicsview-elasticnodes-node-h

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[править] node.h Example File
graphicsview/elasticnodes/node.h

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 #ifndef NODE_H
 #define NODE_H
 
 #include <QGraphicsItem>
 #include <QList>
 
 class Edge;
 class GraphWidget;
 class QGraphicsSceneMouseEvent;
 
 class Node : public QGraphicsItem
 {
 public:
     Node(GraphWidget *graphWidget);
 
     void addEdge(Edge *edge);
     QList<Edge *> edges() const;
 
     enum { Type = UserType + 1 };
     int type() const { return Type; }
 
     void calculateForces();
     bool advance();
 
     QRectF boundingRect() const;
     QPainterPath shape() const;
     void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget);
 
 protected:
     QVariant itemChange(GraphicsItemChange change, const QVariant &value);
 
     void mousePressEvent(QGraphicsSceneMouseEvent *event);
     void mouseReleaseEvent(QGraphicsSceneMouseEvent *event);
 
 private:
     QList<Edge *> edgeList;
     QPointF newPos;
     GraphWidget *graph;
 };
 
 #endif

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Qt 4.3.2