//-----------------------------------------------------------------------------+
// Copyright (C), 1998-2007, Beijing Tangent Software Co. Ltd.
// = FileName	:   TPGeLine3D.cpp
// = Version	:   ver2.0
// = Author		:   wlw
// = CreateDate	:   2002-09-09
// = Description:   类的定义
// = Maintainers: 
//                  
//-----------------------------------------------------------------------------+
#include "StdAfx.h"
#include "TPGeLine3D.h"
#include "TGMatrix.h"

TPGeLine3D::TPGeLine3D():a(x),b(y),c(z)
{
	
}

TPGeLine3D::TPGeLine3D(const TGVector3D& vt,const TGPoint& pt):TGVector3D(vt),basePoint(pt),a(x),b(y),c(z)
{
	
}

TPGeLine3D::TPGeLine3D(const TGPoint& pt0,const TGPoint& pt1):TGVector3D(pt0,pt1),basePoint(pt0),a(x),b(y),c(z)
{
}

TPGeLine3D::TPGeLine3D(const TPGeLine3D& line):TGVector3D(line),basePoint(line.basePoint),a(x),b(y),c(z)
{
	
}

TPGeLine3D::~TPGeLine3D()
{
	
}


TPGeLine3D& TPGeLine3D::operator = (const TPGeLine3D& line)
{
	a = line.a;
	b = line.b;
	c = line.c;
	basePoint = line.basePoint;
	return *this;
}

bool TPGeLine3D::IsValid() const
{
	return !IsNullVector();
}

void TPGeLine3D::Pa2Pt(double pa,TGPoint& pt) const
{
	pt.x = basePoint.x + a * pa;
	pt.y = basePoint.y + b * pa;
	pt.z = basePoint.z + c * pa;
}

void TPGeLine3D::Pt2Pa(const TGPoint& pt,double& pa) const
{
	if(fabs(a) > fabs(b) && fabs(a) > fabs(c))
	{
		pa = (pt.x - basePoint.x) / a;
	}
	else if(fabs(b)>fabs(c))
	{
		pa = (pt.y - basePoint.y) / b;
	}
	else
	{
		pa = (pt.z - basePoint.z) / c;
	}
}

bool TPGeLine3D::IsInSamePlane(const TPGeLine3D& line) const
{
	TGVector3D vt(basePoint,line.basePoint);
	return (vt*(*this)).IsParallel(vt*line);
}

bool TPGeLine3D::IsSameLine(const TPGeLine3D& 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;
	}
}

GRelation TPGeLine3D::HitTest(const TGPoint& pt,bool bNormalized) const
{
	TGVector3D vt1(basePoint,pt);
	if(bNormalized)
	{//vt1最多进行一次规范化
		vt1.Normalize();
	}
	if(IsParallel(vt1,bNormalized))
	{
		return GR_IN;
	}
	else
	{
		return GR_OUT;
	}
}

int TPGeLine3D::Intersect(const TPGeLine3D& line,double& pa,bool bNormalized) const
{
	if(bNormalized)
	{
		return LineInt3D(basePoint,*this,line.basePoint,line,pa);
	}
	
	TGVector3D vt1(*this),vt2(line);
	double l1 = vt1.Length();
	vt1 /= l1;
	vt2.Normalize();
	int iRet = LineInt3D(basePoint,vt1,line.basePoint,vt2,pa);
	pa /= l1;
	return iRet;
}

int TPGeLine3D::Intersect(const TPGeLine3D& line,TGPoint& pt,bool bNormalized) const
{
	double pa;
	int res;
	if(bNormalized)
	{
		res = LineInt3D(basePoint,*this,line.basePoint,line,pa);
	}
	else
	{
		TGVector3D vt1(*this),vt2(line);
		double l1 = vt1.Length();
		vt1 /= l1;
		vt2.Normalize();
		res = LineInt3D(basePoint,vt1,line.basePoint,vt2,pa);
		pa /= l1;
	}
	if(res == INT_1PT)
	{
		Pa2Pt(pa,pt);
	}
	return res;
}

int TPGeLine3D::Intersect(const TPGeLine3D& line,double& pa1,double& pa2,bool bNormalized) const
{
	TGPoint pt;
	int res = Intersect(line,pt,bNormalized);
	if(res == INT_1PT)
	{
		Pt2Pa(pt,pa1);
		line.Pt2Pa(pt,pa2);
	}
	return res;
}

void TPGeLine3D::TransformBy(const TGMatrix* pMatrix)
{
	ASSERT(pMatrix != NULL);

	pMatrix->Transform(*this);
	pMatrix->Transform3D(basePoint);
}

int TPGeLine3D::LineInt3D(const TGPoint &pt1,const TGVector3D &vt1, const TGPoint &pt2,const TGVector3D &vt2, double &pa1)const
{
	TGVector3D vt3(pt1,pt2);
	vt3.Normalize();
	
	if (!(vt1 * vt3).IsParallel(vt2 * vt3,true))
	{
		return INT_NULL;
	}
	
	double temp = (vt2.y * vt1.x - vt2.x * vt1.y);
	if (!EQUAL_ZERO(temp))
	{
		pa1 = (vt2.y * pt2.x - vt2.y * pt1.x - vt2.x * pt2.y + vt2.x * pt1.y) / temp;
		return INT_1PT;
	}
	
	temp = (vt2.z * vt1.x - vt2.x * vt1.z);
	if (!EQUAL_ZERO(temp))
	{
		pa1 = (vt2.z * pt2.x - vt2.z * pt1.x - vt2.x * pt2.z + vt2.x * pt1.z) / temp;
		return INT_1PT;
	}
	
	temp = (vt2.y * vt1.z - vt2.z * vt1.y);
	if (!EQUAL_ZERO(temp))
	{
		pa1 = (vt2.y * pt2.z - vt2.y * pt1.z - vt2.z * pt2.y + vt2.z * pt1.y) / temp;
		return INT_1PT;
	}
	
	if (vt1.IsParallel(vt3,true))
	{
		return INT_LINE;
	}
	else
	{
		return INT_NULL;
	}
}