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// glPolygon.h: interface for the glPolygon class. 
// 
////////////////////////////////////////////////////////////////////// 
 
#if !defined(AFX_GLPOLYGON_H__BE0DF9A4_4C6F_44DF_BB9B_060C57D14011__INCLUDED_) 
#define AFX_GLPOLYGON_H__BE0DF9A4_4C6F_44DF_BB9B_060C57D14011__INCLUDED_ 
 
#if _MSC_VER > 1000 
#pragma once 
#endif // _MSC_VER > 1000 
 
#include "glGraph.h" 
 
struct point//点 
{ 
	float nod[2]; 
	struct point* m_next; 
}; 
 
struct EDGE//边结构 
{ 
	int ymax; 
	float x; 
	float deltax; 
	EDGE* nextEdge; 
}; 
 
class glPolygon : public glGraph   
{ 
public: 
	void DeleteLastPoint(); 
	void InsetEdgeToAEL(int y); 
	void Fill(); 
	void DeleteET(); 
	void InsertEdgeToET(int kind,EDGE* e); 
	point* GetPointForY(float y); 
	point* GetNextPointForY(float y); 
	point* GetPrePointForY(float y); 
	void CreatET(); 
	int IsAble(); 
	void AddPoint(float x,float y,double width,double height); 
	glPolygon(); 
	virtual ~glPolygon(); 
	void Draw(); 
 
protected: 
	int num;//定点数 
	EDGE* AEL;//活化边表 
	point* head; 
	point* tail; 
	EDGE* ET;//边分类表 
	float ymin; 
	float ymax; 
}; 
 
#endif // !defined(AFX_GLPOLYGON_H__BE0DF9A4_4C6F_44DF_BB9B_060C57D14011__INCLUDED_)