//-------------------------------------------------------------------------------------------------------+
// Copyright (C), 1998-2007, Beijing Tangent Software Co. Ltd.
// = FileName	:   TGVector2D 类
// = Version	:   ver2.0
// = Author		:   wlw
// = CreateDate	:   2002-09-09
// = Description:   TGVector2D 声明
// = Maintainers: 
//                  
//-------------------------------------------------------------------------------------------------------+
#ifndef _TGVECTOR2D_H_
#define _TGVECTOR2D_H_

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

class GEOAPI TGVector2D : public TGPoint
{
public:
	//construct
	TGVector2D(double x = 0,double y = 0,double z = 0);
	TGVector2D(double*p);
	TGVector2D(float*p);
	TGVector2D(const TGPoint& pt);
	TGVector2D(const TGPoint& fromPt,const TGPoint& toPt);
	~TGVector2D();

	void Polar(double angle);

	double Length() const;

	bool IsValid() const;
 	bool IsNullVector() const;
	bool IsNormalized() const;

	bool Normalize();
	void SetVector(double x,double y);
	void SetLength(double len);
	void Reverse();

	TGVector2D operator -() const;
	TGVector2D operator +(const TGPoint& vt) const;
	TGVector2D operator -(const TGPoint& vt) const;
	TGVector2D operator *(double rate) const;
	TGVector2D operator /(double rate) const;
	void  operator +=  (const TGPoint& vt);
	void  operator -=  (const TGPoint& vt);
	void  operator *=  (double rate);
	void  operator /=  (double rate);
	double operator & (const TGPoint& vt) const;
	double operator * (const TGPoint& vt) const;

	bool operator == (const TGPoint& pt) const;
	bool operator != (const TGPoint& pt) const;

	bool IsParallel(const TGPoint& vt,bool bNormalized = false) const;
	
	bool IsVectorLeft(const TGPoint& vt,bool bNormalized = false) const;
	bool IsVectorRight(const TGPoint& vt,bool bNormalized = false) const;

	bool IsVert(const TGPoint& vt,bool bNormalized = false) const;
	
	//夹角小于90度
	bool IsSameDirection(const TGPoint& vt,bool bNormalized = false) const;
	
	//夹角大于90度
	bool IsReverseDirection(const TGPoint& vt,bool bNormalized = false) const;

	//from vt to this [0,PI*2)
	double GetAngleWith(const TGPoint& vt,bool bNormalized = false) const;

	//from X axis to this,[0,PI*2)
	double GetAngle() const;

	void GetLVertVector(TGPoint& vt) const;
	void GetRVertVector(TGPoint& vt) const;
};
#endif