//-----------------------------------------------------------------------------+
// Copyright (C), 1998-2007, SH Software Co. Ltd.
// = FileName	:   XTriangle类
// = Version	:   ver2.0
// = Author		:   zjq
// = CreateDate	:   2002-09-09
// = Description:   XTriangle类声明
// = Maintainers: 
//                  
//-----------------------------------------------------------------------------+
#ifndef _XTRIANGLE_H_
#define _XTRIANGLE_H_

#ifndef _XPOINT_H_
#include "XPoint.h"
#endif

#ifndef _X3DFACE_H_
#include "X3DFace.h"
#endif

#define SIDE1_INVISIBLE 0x01
#define SIDE2_INVISIBLE 0x02
#define SIDE3_INVISIBLE 0x04

// 用三角形拼多边形
class GEOAPI XTriangle 
{
public:
	
	XTriangle(const XPoint &pt1, const XPoint &pt2, const XPoint &pt3, int nFlag=0);
	virtual ~XTriangle();
	
	void Ecs2Wcs(XVector3D vtEcs);
	void Wcs2Ecs(XVector3D vtEcs);

	void AsFace(X3DFace &face) const;
	
	int IsLinear();
	int IsInvisible();
	
	// 1~3－命中1～3点；-1~-3 －命中1~3边；0－外部；4－内部
	int HitTest2d(const XPoint &ptTest) const;
	
	enum HitType
	{
		HIT_SIDE1 = -1,				//边1
		HIT_SIDE2 = -2,				//边2
		HIT_SIDE3 = -3,				//边3
		
		HIT_OUTSIDE = 0,			//外部
		
		HIT_VERTEX1 = 1,			//顶点1
		HIT_VERTEX2 = 2,			//顶点2
		HIT_VERTEX3 = 3,			//顶点3
		
		HIT_INSIDE = 4				//内部
	};
	
public:
	
	int m_nFlag; 
	
	XPoint vertex1, vertex2, vertex3;
};
#endif