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

#ifndef _TGGECIRCLE_H_
#include "TGGeCircle.h"
#endif

#ifndef _TGGESECTOR_H_
#include "TGGeSector.h"
#endif

#ifndef _TADSGEPOINT3D_H_
#include "TADSGePoint3d.h"
#endif


class TEntitySet;
class GEOAPI TGGeArc : public TGGeCircle, public TGGeSector
{
public :
	TGGeArc();
	TGGeArc(const TGGeArc &src);
	TGGeArc(const TEntitySet &aCircle);
	TGGeArc(const TEntitySet &aArc, ads_matrix mat);
	TGGeArc(const TADSGePoint3d &spt, const TADSGePoint3d &ept, ads_real dang);
	TGGeArc(const TADSGePoint3d &ptStart, const TADSGePoint3d &pt2, const TADSGePoint3d &ptEnd);
	TGGeArc(ads_point ptcenter, double dradius, double ptstartAngle, double ptendAngle);
	virtual ~TGGeArc();

	virtual	bool IsKindOf(TEntityId entType) const;
	virtual	TEntityId Type() const;
	virtual void CopyFrom(const TGGeEntity* pImpSrc);

	virtual int Make(const TCHAR *szlay = NULL) const;
	virtual int Modify(const TEntitySet* pEnt) const;
	virtual int GetExtend(ads_point lowPt, ads_point upPt) const;
	virtual int MakeEntity(const TEntitySet* pEnt) const;
	virtual int GetSubArc(const TADSGePoint3d &ptloc, ads_real dchordLen, TGGeArc &arcRes) const;
	//图形长度，周长
	virtual ads_real GetLength() const;
	
	TGGeArc& operator = (const TGGeSector &src);
	TGGeArc& operator = (const TGGeArc &src);
	bool  operator == (const TGGeArc &src) const;
	int   operator ! () const;
	
	virtual	int HitTest2d(const TADSGePoint3d &ptTest) const;
	virtual	int OSnap(int nMode, TADSGePoint3d &ptPick) const;
	
	bool Set(const TADSGePoint3d &spt, const TADSGePoint3d &ept, ads_real dang);
	bool Set(const TADSGePoint3d &ptStart, const TADSGePoint3d &ptOn, const TADSGePoint3d &ptEnd);
	void SetAngleByPoints(const TADSGePoint3d &ptStart, const TADSGePoint3d &ptEnd);
	
	void GetStartPoint(TADSGePoint3d &ptStart) const;
	void GetEndPoint(TADSGePoint3d &ptEnd) const;

	void MidPoint(TADSGePoint3d &ptres) const;
	TADSGePoint3d MidPoint() const;

	//求弦长
	ads_real ChordLength() const;
	// 扇形面积
	ads_real Area() const;
	//起点到终点的积分面积
	ads_real PathArea() const;
	
	TGGeArc Offset(ads_real dist) const;
	
	virtual void TransUCS(ads_matrix mat);
	
	//上华direction
	ads_real  IDirection(int pt) const;
	ads_real  ODirection(int pt) const;
	
	virtual	int  Intersection(const TGGeLine* pLine, ads_point ptRp1 = NULL, ads_point ptRp2 = NULL) const;
	virtual	int  Intersection(const TGGeArc* pArc, ads_point ptRp1 = NULL, ads_point ptRp2 = NULL) const;
	virtual	int  Intersection(const TGGeCircle* pCir, ads_point ptRp1 = NULL, ads_point ptRp2 = NULL) const;
	
	ads_real * SelectNear(ads_point pt1, ads_point pt2) const;
	int PtOnArc(const TADSGePoint3d &pt) const;
};


inline TGGeArc& TGGeArc::operator = (const TGGeSector &src)
{
	m_dstartAngle = src.m_dstartAngle;
	m_dendAngle = src.m_dendAngle;
	return *this;
}

inline TGGeArc& TGGeArc::operator = (const TGGeArc &src)
{
	if (this != &src)
	{
		m_dstartAngle = src.m_dstartAngle;
		m_dendAngle = src.m_dendAngle;
		m_ptCenter = src.m_ptCenter;
		m_dRadius = src.m_dRadius;
	}
	return *this;
}

inline int TGGeArc::operator ! () const
{
	return (TGGeCircle::operator !() || GetLength() < TchGeLib::_DIST_SNAP);
}

inline bool TGGeArc::operator == (const TGGeArc &src) const
{
	return (TGGeCircle::operator == (src) && TGGeSector::operator == (src));
}

inline TGGeArc TGGeArc::Offset(ads_real dist) const
{ 
	ads_real r = m_dRadius + dist;
	if (r < TchGeLib::_DIST_SNAP) 
	{
		r = 0;
	}
	return TGGeArc(m_ptCenter, r, m_dstartAngle, m_dendAngle);
}

inline ads_real TGGeArc::GetLength() const
{
	return Bulge() * m_dRadius;
}

inline ads_real TGGeArc::ChordLength() const
{
	return fabs(2.0 * m_dRadius * sin(Bulge() / 2.0));
}

inline void TGGeArc::MidPoint(TADSGePoint3d &ptres) const
{
	ads_polar(m_ptCenter, MidAngle(), m_dRadius, ptres);
}

inline TADSGePoint3d TGGeArc::MidPoint() const
{
	TADSGePoint3d ptres;
	ads_polar(m_ptCenter, MidAngle(), m_dRadius, ptres);
	return ptres;
}

#endif