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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