//-----------------------------------------------------------------------------+
// Copyright (C), 1998-2007, Beijing Tangent Software Co. Ltd.
// = FileName	:   TPGeLine2D.cpp
// = Version	:   ver2.0
// = Author		:   wlw
// = CreateDate	:   2002-09-09
// = Description:   类的定义
// = Maintainers: 
//                  
//-----------------------------------------------------------------------------+
#include "StdAfx.h"
#include "TPGeLine2D.h"
#include "TPGeCircle.h"
#include "TGMatrix.h"

TPGeLine2D::TPGeLine2D():a(x),b(y),c(z)
{
}

TPGeLine2D::TPGeLine2D(const TGVector2D&vt,const TGPoint&pt) : TGVector2D(vt),basePoint(pt),a(x),b(y),c(z)
{
}

TPGeLine2D::TPGeLine2D(const TGPoint&pt0,const TGPoint&pt1) : TGVector2D(pt0,pt1),basePoint(pt0),a(x),b(y),c(z)
{
}

TPGeLine2D::TPGeLine2D(const TPGeLine2D&line) : TGVector2D(line),basePoint(line.basePoint),a(x),b(y),c(z)
{
}

TPGeLine2D::~TPGeLine2D()
{
	
}


TPGeLine2D& TPGeLine2D::operator = (const TPGeLine2D&line)
{
	a = line.a;
	b = line.b;
	c = line.z;
	basePoint = line.basePoint;
	return *this;
}

void TPGeLine2D::SetVector(const TGPoint&vt)
{
	a = vt.x;
	b = vt.y;
	c = vt.z;
}

bool TPGeLine2D::IsValid()const
{
	return !IsNullVector();
}

bool TPGeLine2D::IsSameLine(const TPGeLine2D&line,bool bSameDirection,bool bNormalized)const
{
	bool r = IsParallel(line,bNormalized) && HitTest(line.basePoint,bNormalized).Is(GR_IN);
	if(bSameDirection)
	{
		return r && IsSameDirection(line,bNormalized);
	}
	else
	{
		return r;
	}
}

double TPGeLine2D::Integration(double pa0,double pa1)const
{
	return LineIntegration2D(basePoint,*this,pa0,pa1);
}

void TPGeLine2D::SetPoint(const TGPoint&pt0,const TGPoint&pt1)
{
	a = pt1.x - pt0.x;
	b = pt1.y - pt0.y;
	basePoint = pt0;
}

void TPGeLine2D::Pa2Pt(double pa,TGPoint&pt)const
{
	pt.x = basePoint.x + a * pa;
	pt.y = basePoint.y + b *  pa;
	pt.z = basePoint.z;
}

void TPGeLine2D::Pt2Pa(const TGPoint&pt,double&pa)const
{
	pa = fabs(a) > fabs(b) ? (pt.x - basePoint.x) / a : (pt.y - basePoint.y) / b;
}

GRelation TPGeLine2D::HitTest(const TGPoint&pt,bool bNormalized)const
{
	//强制执行距离精度　
	TGPoint ptNear;
	GetNearestPoint(pt,ptNear);
	if(DOWNEQUAL_ZEROD(Distance2D(pt,ptNear)))
	{
		return GR_IN;
	}

	TGVector2D vt1(basePoint,pt);
	vt1.Normalize();

	double dn;
	if(bNormalized)
	{
		dn = (*this) * vt1;
	}
	else
	{
		TGVector2D vt0(*this);
		vt0.Normalize();
		dn = vt0 * vt1;
	}

	if(dn > 0)
	{
		return GR_LEFT;
	}
	else if(dn < 0)
	{
		return GR_RIGHT;
	}
	else
	{
		return GR_IN;
	}
}

int TPGeLine2D::Intersect(const TPGeLine2D&line,double&pa,bool bNormalized)const
{
	if(bNormalized)
	{
		return LineInt2D(basePoint,*this,line.basePoint,line,pa);
	}
	TGVector2D vt1(*this),vt2(line);
	double l1 = vt1.Length();
	vt1 /= l1;
	vt2.Normalize();
	int iRet = LineInt2D(basePoint,vt1,line.basePoint,vt2,pa);
	pa /= l1;
	return iRet;
}

int TPGeLine2D::Intersect(const TPGeLine2D&line,double&pa1,double&pa2,bool bNormalized)const
{
	if(bNormalized)
	{
		return LineInt2D(basePoint,*this,line.basePoint,line,pa1,pa2);
	}

	TGVector2D vt1(*this),vt2(line);
	double l1 = vt1.Length(),l2 = vt2.Length();
	vt1 /= l1;
	vt2 /= l2;

	int iRet = LineInt2D(basePoint,vt1,line.basePoint,vt2,pa1,pa2);
	pa1 /= l1;
	pa2 /= l2;
	return iRet;
}

int TPGeLine2D::Intersect(const TPGeLine2D&line,TGPoint&pt,bool bNormalized)const
{
	double pa;
	int ret = Intersect(line,pa,bNormalized);
	if(ret==INT_1PT)
	{
		Pa2Pt(pa,pt);
	}
	return ret;
}

void TPGeLine2D::GetNearestPoint(const TGPoint&pt,TGPoint&res)const
{
	TPGeLine2D line;
	GetLVertVector(line);
	line.basePoint = pt;
	Intersect(line,res);
}

void TPGeLine2D::Offset(double nDist)
{
	TGVector2D vt;
	GetRVertVector(vt);
	vt.SetLength(nDist);
	basePoint += vt;
}

int TPGeLine2D::Intersect(const TPGeCircle *pCircle,double&pa1,double&pa2,bool bNormalized)const
{
	ASSERT(pCircle != NULL);

	if(bNormalized)
	{
		return LineCirInt2D(pCircle->center,pCircle->r,basePoint,*this,pa1,pa2);
	}

	TGVector2D vt(*this);
	double len = vt.Length();
	vt /= len;

	int iRet= LineCirInt2D(pCircle->center,pCircle->r,basePoint,vt,pa1,pa2);
	pa1 /= len;
	pa2 /= len;

	return iRet;
}

void TPGeLine2D::TransformBy(const TGMatrix* pMatrix)
{
	ASSERT(pMatrix != NULL);

	pMatrix->Transform(*this);
	pMatrix->Transform2D(basePoint);
}