DisplayEdge.h

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#ifndef DISPLAYEDGE_H
#define DISPLAYEDGE_H


#include <QGraphicsItem>


class DisplayNode;

class DisplayEdge : public QGraphicsItem
{
    public:
        DisplayEdge(DisplayNode * from, DisplayNode * to);
        virtual ~DisplayEdge() {}

        DisplayNode *sourceNode() const  { return source; }
        DisplayNode *destNode()   const  { return dest; }

        void adjust();

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

        void setColor(const QColor & c)  { color=c; }
        void setWidth(double width)      { penWidth=1; }

        enum PaintMode { STRAIGHT,    
                         RECTANGULAR, 
                         BEZIER_QUAD, 
                         BEZIER_CUBIC 
        };

        void setPaintMode(PaintMode m) { paintMode=m; }


        void setEdgeLabel(const QString & label);
        const QString & getEdgeLabel()  const     { return edgeLabel; }

    protected:
         void setSourceNode(DisplayNode *node) { source=node; adjust(); }
         void setDestNode  (DisplayNode *node) { dest=node;   adjust(); }



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


    private:
        bool intersectPolyWithLine(QPointF & res, const QPolygonF & poly, const QLineF & l);

        DisplayNode * source;
        DisplayNode * dest;

        QPointF sourcePoint;
        QPointF destPoint;

        PaintMode paintMode;

        QString edgeLabel;

        double arrowSize;

        double penWidth;

        QColor color;
};

#endif

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