sweep_context.h

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 * Poly2Tri Copyright (c) 2009-2010, Poly2Tri Contributors
 * http://code.google.com/p/poly2tri/
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#ifndef SWEEP_CONTEXT_H
#define SWEEP_CONTEXT_H
 
#include <list>
#include <vector>
#include <cstddef>
 
namespace p2t {
 
// Inital triangle factor, seed triangle will extend 30% of
// PointSet width to both left and right.
const double kAlpha = 0.3;
 
struct Point;
class Triangle;
struct Node;
struct Edge;
class AdvancingFront;
 
class SweepContext {
public:

explicit SweepContext(const std::vector<Point*> &polyline);
~SweepContext();
 
void set_head(Point* p1);
 
Point* head();
 
void set_tail(Point* p1);
 
Point* tail();
 
int point_count();
 
Node& LocateNode(Point& point);
 
void RemoveNode(Node* node);
 
void CreateAdvancingFront(std::vector<Node*> nodes);

void MapTriangleToNodes(Triangle& t);
 
void AddToMap(Triangle* triangle);
 
Point* GetPoint(const int& index);
 
Point* GetPoints();
 
void RemoveFromMap(Triangle* triangle);
 
void AddHole(const std::vector<Point*> &polyline);
 
void AddPoint(Point* point);
 
AdvancingFront* front();
 
void MeshClean(Triangle& triangle);
 
std::vector<Triangle*> GetTriangles();
std::list<Triangle*> GetMap();
 
std::vector<Edge*> edge_list;
 
struct Basin {
  Node* left_node;
  Node* bottom_node;
  Node* right_node;
  double width;
  bool left_highest;
 
  Basin() : left_node(nullptr), bottom_node(nullptr), right_node(nullptr), width(0.0), left_highest(false)
  {
  }
 
  void Clear()
  {
    left_node = nullptr;
    bottom_node = nullptr;
    right_node = nullptr;
    width = 0.0;
    left_highest = false;
  }
};
 
struct EdgeEvent {
  Edge* constrained_edge;
  bool right;
 
  EdgeEvent() : constrained_edge(nullptr), right(false)
  {
  }
};
 
Basin basin;
EdgeEvent edge_event;
 
private:
 
friend class Sweep;
 
std::vector<Triangle*> triangles_;
std::list<Triangle*> map_;
std::vector<Point*> points_;
 
// Advancing front
AdvancingFront* front_;
// head point used with advancing front
Point* head_;
// tail point used with advancing front
Point* tail_;
 
Node *af_head_, *af_middle_, *af_tail_;
 
void InitTriangulation();
void InitEdges(std::vector<Point*> polyline);
 
};
 
inline AdvancingFront* SweepContext::front()
{
  return front_;
}
 
inline int SweepContext::point_count()
{
  return points_.size();
}
 
inline void SweepContext::set_head(Point* p1)
{
  head_ = p1;
}
 
inline Point* SweepContext::head()
{
  return head_;
}
 
inline void SweepContext::set_tail(Point* p1)
{
  tail_ = p1;
}
 
inline Point* SweepContext::tail()
{
  return tail_;
}
 
}
 
#endif