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

    /****************************************************************************
    **
    ** Copyright (C) 2006-2006 Trolltech ASA. All rights reserved.
    **
    ** This file is part of the example classes of the Qt Toolkit.
    **
    ** Licensees holding valid Qt Preview licenses may use this file in
    ** accordance with the Qt Preview License Agreement provided with the
    ** Software.
    **
    ** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
    ** information about Qt Commercial License Agreements.
    **
    ** Contact info@trolltech.com if any conditions of this licensing are
    ** not clear to you.
    **
    ** 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