vispoly.h

source code to compute the visibility polygon of a point in a polygon.

/* Brian O'Connor
 * 
 * vispoly.h: functions & data structures for creating a visibility
 * polygon
 */

#ifndef VISPOLY_H
#define VISPOLY_H

#include "input.h"
#include "line.h"

#define CALCPOLY_PTS      40

class EdgeInfo;

class VPEdge: public Line {
public:

  VPEdge(Point *p1, Point *p2) : Line(p1, p2) 
    { bGap = FALSE; bMark = FALSE; fullEdge = NULL;}


  Line *fullEdge;
  int bGap;
  int bMark;

};

class VPoly {
public:
  int nEdges;
  VPEdge **edges;
};

int MakeVisPoly(EdgeInfo *eInfo, Point *p, VPoly *vpoly);
void ExtendGapEdge(Point *p1, Point *p2, EdgeInfo *e, EdgeInfo *vEdges,
		   Obstacle *o2);

#endif /*VISPOLY_H*/