//-----------------------------------------------------------------------------+
// Copyright (C), 1998-2007, Beijing Tangent Software Co. Ltd.
// = FileName	:   TPGeCurve3D.h
// = Version	:   ver2.0
// = Author		:   xlc
// = CreateDate	:   2002-09-09
// = Description:   类的声明 空间有向连续参数曲线,起点参数0,如果有终点，终点参数为1

// = Maintainers: 
//                  
//-----------------------------------------------------------------------------+
#ifndef _TPGECURVE3D_H_
#define _TPGECURVE3D_H_

#ifndef _TGOBJECT3D_H_
#include "TGObject3D.h"
#endif

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

#ifndef _TGOBJECT_H_
#include "TGObject.h"
#endif

#ifndef _TTABLE_H_
#include "TTable.h"
#endif

#ifndef _TGOBJECTLIST_H_
#include "TGObjectList.h"
#endif

class TGMLine3D;

class GEOAPI TPGeCurve3D : public TGObject3D
{
	DECLARE_RUN_TIME_CLASS(TPGeCurve3D)
		
public:
	
	virtual ~TPGeCurve3D();

	virtual void GetStartPoint(TGPoint& pt) const;
	
	virtual void GetEndPoint(TGPoint& pt) const;

	//是否封闭曲线,封闭曲线一定是有限曲线
	virtual bool IsClosed() const;

	//是否有起点或终点
	virtual bool IsFinite(bool bStart) const;

	//存在重复子集
	virtual bool IsSelfCross() const;

	//由曲线参数得到点
	virtual void Pa2Pt(double pa,TGPoint& pt) const;

	//由点得到曲线参数，适用于非自交时!
	virtual void Pt2Pa(const TGPoint& pt,double& pa) const;

	//只适用于平面封闭不自交曲线
	virtual double Area() const;

	//用于有限曲线
	virtual double Length() const;

	//反向
	virtual void Reverse();

	//有限曲线,如果paDist<=0,则使用该实体默认精度
	virtual TGMLine3D* MLinearize(double paDist = 0) const;

	//取线型化的默认精度
	virtual double GetMLinePrec() const;
	
	virtual TPGeCurve3D* GetSubCurve(double pa0,double pa1) const;
	
	//取同曲线方向的子曲线,pa0,pa1必须有效,不封闭时必须pa1>pa0,封闭时pa0==pa1表示一点切割
	virtual void Split(const TTable<double> & paTable,TGObjectList& res) const;
	
	//按参数表分解曲线,paTable为有序表,参数表中参数必须有效!允许冗余参数
	virtual TGPoint GetSamplePoint() const;

	virtual bool IsInclude(const TGObject& obj) const;
		
	void GetMidPoint(TGPoint& pt) const;
	
	//两段曲线是否可以连接,终点与seg的起点相同
	bool IsConnect(const TPGeCurve3D& seg) const;
	
	//是否有两端点
	bool IsCurveSeg() const;
	
	//有限曲线(封闭或是曲线段)
	bool IsFinite() const;
	
	//完全无限曲线
	bool IsInfinite() const;
};

#endif