//-----------------------------------------------------------------------------+
// Copyright (C), 1998-2007, Beijing Tangent Software Co. Ltd.
// = FileName	:   TPtNode.h
// = Version	:   ver2.0
// = Author		:   xlc
// = CreateDate	:   2002-09-09
// = Description:   类的声明
// = Maintainers: 
//                  
//-----------------------------------------------------------------------------+
#ifndef _TPTNODE_H_
#define _TPTNODE_H_

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

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

#ifndef _TPDLIST_H_
#include "TPDList.h"
#endif

class TPtList;

class GEOAPI TPtNode : public TWFlag, public TGPoint
{
public:

	TPtNode();

	TPtNode(const TGPoint& pt,int flag = 0);

	virtual ~TPtNode();
	
	TPtNode* PreA()const;

	TPtNode* PreB()const;

	TPtNode* NextA()const;

	TPtNode* NextB()const;

	void CNNextA(TPtNode*p);

	void CNNextB(TPtNode*p);
	
	void SetPaA(double pa);
	
	void SetPaB(double pa);
	
	bool IsRefA()const;
	
	bool IsRefB()const;
	
	bool IsRefC()const;
	
	double PaA()const;

	double PaB()const;

	TPtNode*& RefA()const;

	TPtNode*& RefB()const;

	TPtNode*& RefC()const;
	
	void SetRefA(TPtNode** p);
	
	void SetRefB(TPtNode** p);
	
	void SetRefC(TPtNode** p);
	
	void Replace(TPtNode* p);
	
	bool IsANode()const;
	
	bool IsBNode()const;
	
	bool IsABNode()const;

	void MakeListIn(TPDList< TPtList > &res);

	void MakeListOut(TPDList< TPtList > &res);

protected:

	TPtNode* nextA;//A环的下一节点

	TPtNode* nextB;//B环的下一节点

	TPtNode* preA; //A环的上一节点

	TPtNode* preB; //B环的上一节点

	double paA;   //A环参数

	double paB;   //B环参数
	
	//引用该结点的指针表项的地址
	TPtNode** pRefA;

	TPtNode** pRefB;

	TPtNode** pRefC;
};

#endif