//-------------------------------------------------------------------------------------------------------+
// Copyright (C), 1998-2007, Beijing Tangent Software Co. Ltd.
// = FileName	:   TPGeArc2D 类
// = Version	:   ver2.0
// = Author		:   wlw
// = CreateDate	:   2002-09-09
// = Description:   TPGeArc2D 声明
// = Maintainers: 
//                  
//-------------------------------------------------------------------------------------------------------+
#ifndef _TPGEARC2D_H_
#define _TPGEARC2D_H_

#ifndef _TPGECURVE2D_H_
#include "TPGeCurve2D.h"
#endif

#ifndef _TPGECIRCLE2D_H_
#include "TPGeCircle2D.h"
#endif

class GEOAPI TPGeArc2D : public TPGeCurve2D
{
	DECLARE_RUN_TIME_CLASS(TPGeArc2D)

public:
	//construct
	TPGeArc2D();
	TPGeArc2D(const TGPoint&pt,double radius,double sA,double cA,bool bUnClockWise=true);
	TPGeArc2D(const TGPoint&sPt,const TGPoint&ePt,double angle);
	TPGeArc2D(const TGPoint&pt0,const TGPoint&pt1,const TGPoint&pt2);
	TPGeArc2D(const TPGeCircle2D& c);

	virtual TPGeCurve2D* GetExtendCurve() const;
	//与起始角的夹角,存在区间[0,centralAngle]
	virtual void Pa2Pt(double pa,TGPoint&pt) const;
	//返回区间[0,2PI)
	virtual void Pt2Pa(const TGPoint&pt,double&pa) const;
	virtual void GetStartPoint(TGPoint&pt) const;
	virtual void GetEndPoint(TGPoint&pt) const;
	virtual void Reverse();
	virtual void GetTangent(double pa,TPGeLine2D&line) const;
	
	virtual bool IsClosed() const;
	virtual bool IsClockwise() const;
	virtual bool Offset(double offset);

	virtual double Integration(double pa0,double pa1) const;
	virtual double Length() const;
	virtual double Area() const;
	virtual double GetMLinePrec() const;
	virtual double GetElev() const;

	virtual TGMLine2D* PLinearize(double paDist=0) const;
	virtual TPGeCurve2D* GetSubCurve(double pa0,double pa1) const;

	//override TGObject2D
	virtual void SetElev(double elev);

	//override TGObject
	virtual bool IsValid() const;
	virtual void TransformBy(const TGMatrix&matrix);
	virtual TGObject * Clone() const;
	virtual bool Intersect(const TGObject&obj,TGObjectList&res) const;
	virtual bool IsInclude(const TGObject&obj) const;

	//测试GR_IN/GR_INSIDE/GR_OUTSIDE/GR_LEFT/GR_RIGHT
	virtual GRelation HitTest(const TGPoint&pt) const;
	virtual bool GetExtend2D(TPGeExtend2D&ext) const;

	//edit
	void Init(const TGPoint&sPt,const TGPoint&ePt,double angle);
	//起点，中间点，终点
	void Init(const TGPoint&pt0,const TGPoint&pt1,const TGPoint&pt2);
	void SetStartAngle(double angle);
	
	//query
	double GetEndAngle() const;
	TGPoint GetStartPoint() const;
	TGPoint GetEndPoint() const;
	TGPoint GetMidPoint() const;


public:
	//弧继承所在圆的曲线方向
	TPGeCircle2D circle;

	//[0,2PI),正向弧度或负向弧度
	double startAngle;
	
	//(0,2PI],终止角与起始角的夹角
	double centralAngle;
	
private:
	double GetAnglePrecFromRadius(double dradius)const;
	double GetParaPrecFromLength(double dlength)const;
	bool   IsParaInSeg(double dpa,double dprec)const;
};

#endif