//-------------------------------------------------------------------------------------------------------+
// Copyright (C), 1998-2007, Beijing Tangent Software Co. Ltd.
// = FileName	:   TPGeLine2D Àà
// = Version	:   ver2.0
// = Author		:   wlw
// = CreateDate	:   2002-09-09
// = Description:   TPGeLine2D ÉùÃ÷ ·½³Ì£ºx=basePoint.x+a*t;y=basePoint.y+b*t;TGVector2D=(a,b)
// = Maintainers: 
//                  
//-------------------------------------------------------------------------------------------------------+
#ifndef _TPGELINE2D_H_
#define _TPGELINE2D_H_

#ifndef _TGVECTOR2D_H_
#include "TGVector2D.h"
#endif

#ifndef _TGPOINT_H_
#include "TGPoint.h"
#endif

#ifndef _TWFLAG_H_
#include "TWFlag.h"
#endif

class TPGeCircle;
class TGMatrix;

class GEOAPI TPGeLine2D : public TGVector2D
{
public:
	
	TPGeLine2D();
	
	TPGeLine2D(const TPGeLine2D& line);
	
	TPGeLine2D(const TGPoint& pt0,const TGPoint& pt1);
	
	TPGeLine2D(const TGVector2D& vt,const TGPoint& pt);
	
	virtual ~TPGeLine2D();

	TPGeLine2D& operator = (const TPGeLine2D& line);

	bool IsValid()const;
	
	void Offset(double nDist);
	
	void Pt2Pa(const TGPoint& pt,double& pa) const;
	
	void Pa2Pt(double pa,TGPoint& pt) const;
	
	void GetNearestPoint(const TGPoint& pt,TGPoint& res) const;
	
	void SetPoint(const TGPoint& pt0,const TGPoint& pt1);
	
	void SetVector(const TGPoint& vt);
	
	void TransformBy(const TGMatrix* pMatrix);

	GRelation HitTest(const TGPoint& pt,bool bNormalized = false) const;

	bool IsSameLine(const TPGeLine2D& line,bool bSameDirection,bool bNormalized = false) const;

	int Intersect(const TPGeLine2D& line,double& pa,bool bNormalized = false) const;
	
	int Intersect(const TPGeLine2D& line,double& pa1,double& pa2,bool bNormalized = false) const;
	
	int Intersect(const TPGeLine2D& line,TGPoint& pt,bool bNormalized = false) const;
	
	int Intersect(const TPGeCircle* pCircle,double& pa1,double& pa2,bool bNormalized = false) const;
	
	double Integration(double pa0,double pa1) const;

public:
	
	double &a,&b,&c;

	TGPoint basePoint;
};

#endif