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/***************************************************************************
*
* Copyright (C) 2005 Elad Lahav (elad_lahav@users.sourceforge.net)
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
***************************************************************************/
#ifndef GRAPHEDGE_H
#define GRAPHEDGE_H
#include <qcanvas.h>
class GraphNode;
/**
* Information used to draw arrow heads at the end of graph edges.
*/
struct ArrowInfo
{
/** The length of the arrow. */
double m_dLength;
/** The tangent of the arrow's angle from the main line. */
double m_dTan;
/** Holds the value sqrt(1 + dTan^2). */
double m_dSqrt;
};
/**
* Draws a directed edge on a canvas.
* The edge is composed of a spline, which is its body, and a polygon, which
* is its head.
* @author Elad Lahav
*/
class GraphEdge : public QCanvasPolygonalItem
{
public:
GraphEdge(QCanvas*, GraphNode*, GraphNode*);
~GraphEdge();
void setCallInfo(const QString&, const QString&, const QString&);
void setPoints(const QPointArray&, const ArrowInfo&);
QString getTip() const;
/**
* @return The coordinates of the convex hull surrounding the edge
*/
virtual QPointArray areaPoints() const { return m_arrArea; }
/**
* @return The head node of the edge
*/
GraphNode* getHead() { return m_pHead; }
/**
* @return The tail node of the edge
*/
GraphNode* getTail() { return m_pTail; }
/**
* @return The bounding rectangle of the edge's head
*/
QRect tipRect() const { return m_rcTip; }
/**
* @return The file path for this call
*/
const QString& getFile() const { return m_sFile; }
/**
* @return The line number for this call
*/
uint getLine() const { return m_sLine.toUInt(); }
/**
* @return The call's text
*/
const QString& getText() const { return m_sText; }
/** Identifies this class among other QCanvasItem classes. */
static int RTTI;
/**
* @return The class identifier
*/
virtual int rtti() const { return RTTI; }
protected:
virtual void drawShape(QPainter&);
private:
/** The edge's starting point. */
GraphNode* m_pHead;
/** The edge's end point. */
GraphNode* m_pTail;
/** The points of the polygon part of the edge. */
QPointArray m_arrPoly;
/** Control points for the spline part of the edge. */
QPointArray m_arrCurve;
QPointArray m_arrArea;
/** The bounding rectangle of the edge's head, used for displaying the
edge's tool-tip. */
QRect m_rcTip;
/** The call's source file. */
QString m_sFile;
/** The call's line number. */
QString m_sLine;
/** The call's text. */
QString m_sText;
void makeArrowhead(const ArrowInfo&);
};
#endif
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