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

     /****************************************************************************
     **
     ** Copyright (C) 2006-2007 Trolltech ASA. All rights reserved.
     **
     ** This file is part of the example classes of the Qt Toolkit.
     **
     ** This file may be used under the terms of the GNU General Public
     ** License version 2.0 as published by the Free Software Foundation
     ** and appearing in the file LICENSE.GPL included in the packaging of
     ** this file.  Please review the following information to ensure GNU
     ** General Public Licensing requirements will be met:
     ** http://www.trolltech.com/products/qt/opensource.html
     **
     ** If you are unsure which license is appropriate for your use, please
     ** review the following information:
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     **
     ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
     ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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     ****************************************************************************/

     #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