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# edge.h Example File
graphicsview/elasticnodes/edge.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 EDGE_H
        #define EDGE_H

        #include <QGraphicsItem>

        class Node;

        class Edge : public QGraphicsItem
        {
        public:
            Edge(Node *sourceNode, Node *destNode);
            ~Edge();

            Node *sourceNode() const;
            void setSourceNode(Node *node);

            Node *destNode() const;
            void setDestNode(Node *node);

            void adjust();

            enum { Type = UserType + 2 };
            int type() const { return Type; }

        protected:
            QRectF boundingRect() const;
            void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget);

        private:
            Node *source, *dest;

            QPointF sourcePoint;
            QPointF destPoint;
            qreal arrowSize;
        };

        #endif