//-------------------------------------------------------------------------------------------------------+
// Copyright (C), 1998-2007, Beijing Tangent Software Co. Ltd.
// = FileName	:   TPGeEllipse Àà
// = Version	:   ver2.0
// = Author		:   wlw
// = CreateDate	:   2002-09-09
// = Description:   TPGeEllipse ÉùÃ÷ ·½³Ì:x=center.x+aRadius*cos(t);y=center.y+bRadius*sin(t)
// = Maintainers: 
//                  
//-------------------------------------------------------------------------------------------------------+
#ifndef _TPGEELLIPSE_H_
#define _TPGEELLIPSE_H_

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

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

class GEOAPI TPGeEllipse
{
public:
	
	TPGeEllipse();
	
	TPGeEllipse(const TGPoint& pt,double aRadius,double bRadius);
	
	virtual ~TPGeEllipse();

	bool operator == (const TPGeEllipse& e) const;

	bool operator != (const TPGeEllipse& e) const;

	bool IsValid() const;
	
	bool IsCircle() const;
	
	GRelation HitTest(const TGPoint& pt) const;

	void Pt2Pa(const TGPoint& pt,double& pa) const;
	
	void Pa2Pt(double pa,TGPoint& pt) const;

public:

	TGPoint center;
	
	double a,b;
};

#endif