//-------------------------------------------------------------------------------------------------------+
// Copyright (C), 1998-2007, Beijing Tangent Software Co. Ltd.
// = FileName	:   TGPolygon2D 类
// = Version	:   ver2.0
// = Author		:   wlw
// = CreateDate	:   2002-09-09
// = Description:   TGPolygon2D 声明 多边形域
// = Maintainers: 
//                  
//-------------------------------------------------------------------------------------------------------+
#ifndef _TGPOLYGON2D_H_
#define _TGPOLYGON2D_H_

#ifndef _TGREGION2D_H_
#include "TGRegion2D.h"
#endif

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

#ifndef _TGMLINE2D_H_
#include "TGMLine2D.h"
#endif

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

class TGObject;
class TGPolygonEx2D;

class GEOAPI TGPolygon2D : public TGRegion2D
{
	DECLARE_RUN_TIME_CLASS(TGPolygon2D)
public:
	//contruct
	TGPolygon2D(long vertexNum = 0);
	TGPolygon2D(const TGMLine2D& ml,bool bCheck=true);
	virtual ~TGPolygon2D();

	//override TGRegion2D
	virtual void CutBy(const TPGeCurve2D& curve,TGObjectList& left,TGObjectList& right) const;
	virtual void SubtractBy(const TGRegion2D& face,TGObjectList& res) const;
	
	virtual TGRegion2D* Union(const TGRegion2D& face) const;
	virtual TPGeCurve2D* GetBoundary(long i) const;

	//边界有效、封闭、逆时针、不自交
	virtual bool IsValid() const;

	//分解为TGNPolygon2D
	virtual TGObject* Clone() const;

	virtual bool Inter(const TGRegion2D& face,TGObjectList& res) const;

	virtual bool Explode(TGObjectList& res) const;

	//query
	TGMLine2D&  Outline() const;
	bool IsConcave() const;
	TGPoint Center() const;

	//operate
	bool Inter(const TGPolygon2D& poly,TGObjectList& res) const;
	void SubtractBy(const TGPolygon2D& poly,TGObjectList& res) const;
	void SubtractBy(const TGPolygonEx2D* pPoly,TGObjectList& res) const;

	TGRegion2D* Union(const TGPolygon2D& poly) const;

protected:
	TGMLine2D mLine;

};
#endif