#ifndef _SEGMENT_H_
#define _SEGMENT_H_

#include "global.h"

/*
 * Segment Class
 *
 * This class holds a particular line segment. It also provides functionality
 * such as determining whether, and where, two line segments intersect.
 *
 */

class Vertex;

class Segment {

public:
  Segment();
  Segment(Vertex *v1, Vertex *v2);
  Segment(Vertex *v1, Vertex *v2, Polygon *p);
  ~Segment();

  void do_copy(Segment *s_copy);

  void SetVertex(Vertex *v, int num);
  Vertex *GetVertex(int num);

  void Flip();

  int Equals(Segment *other);

  Vertex *Intersection(Segment *other, int bounds);
  int IsIntersection(Segment *other, int bounds);
  int Contains(Vertex *v);
  int VertexOnSegment(Vertex *v);

  void print();

  fixedpt slope;
  int slope_inf;
  fixedpt y_intercept;  

  fixedpt line_x, line_y, line_w;

  Polygon *neighbor;

private:
  void compute_slope();
  int compute_intersection(Segment *other, int bounds,
			   fixedpt *hit_x, fixedpt *hit_y);

  Vertex *verts[2];

};

#endif  /* _SEGMENT_H_ */