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# node.h Example File
graphicsview/elasticnodes/node.h

     /****************************************************************************
     **
     ** Copyright (C) 2006-$THISYEAR$ $TROLLTECH$. All rights reserved.
     **
     ** This file is part of the $MODULE$ of the Qt Toolkit.
     **
     ** $TROLLTECH_DUAL_LICENSE$
     **
     ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
     ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
     **
     ****************************************************************************/

     #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