envi-code/SourceCode/Code2026/tg_shs/shs_geLib/TGGeTriangle.cpp

//-----------------------------------------------------------------------------+
// Copyright (C), 1998-2007, Beijing Tangent Software Co. Ltd.
// = FileName	:   TGGeTriangle 类
// = Version	:   ver2.0
// = Author		:   wlw
// = CreateDate	:   2002-09-09
// = Description:   TGGeTriangle 类定义
// = Maintainers: 
//                  
//-----------------------------------------------------------------------------+
#include "StdAfx.h"
#include "TGGeTriangle.h"
#include "TGGeLine.h"
#include "TchPrivateGlobalFunc.h"
#include "TchGlobalCurveFunc.h"
#include "TGGeCurveInline.h"

void TGGeTriangle::Ecs2Wcs(TVector3D vtEcs)
{
    vertex1 = TchPrivate::Ecs2Wcs(vertex1, vtEcs);
    vertex2 = TchPrivate::Ecs2Wcs(vertex2, vtEcs);
    vertex3 = TchPrivate::Ecs2Wcs(vertex3, vtEcs);
}

void TGGeTriangle::Wcs2Ecs(TVector3D vtEcs)
{
    vertex1 = TchPrivate::Wcs2Ecs(vertex1, vtEcs);
    vertex2 = TchPrivate::Wcs2Ecs(vertex2, vtEcs);
    vertex3 = TchPrivate::Wcs2Ecs(vertex3, vtEcs);
}

// 判断三角形是否退化为线或点
int TGGeTriangle::IsLinear()
{
	TGGeLine ln(vertex1, vertex2);
	if (ln.GetLength() < 1E-9)
	{
		return 1;
	}

	int nPrFlag = vertex3 & ln;
	if (nPrFlag != PR_OUTSIDE)
	{
		return 1;
	}

	return 0;
}

// 1~3－命中1～3点；-1~-3 －命中1~3边；0－外部；4－内部
int TGGeTriangle::HitTest2d(const TADSGePoint3d &ptTest) const
{
	//  0--错误；1－左边；2－右边；3－起始点；4－终止点；5－线内；6－起始侧延长线；7－终止侧延长线
	int nHit1 = TGGeLine(vertex1, vertex2).HitTest2d(ptTest);
    if (nHit1 == 3)
	{
		return HIT_VERTEX1; // verttex1
	}

	if (nHit1 == 4)
	{
		return HIT_VERTEX2;
	}

	if (nHit1 == 5)
	{
		return HIT_SIDE1;
	}

	int nHit2 = TGGeLine(vertex2, vertex3).HitTest2d(ptTest);
	if (nHit2 == 4)
	{
		return HIT_VERTEX3;
	}

	if (nHit2 == 5)
	{
		return HIT_SIDE2;
	}

	int nHit3 = TGGeLine(vertex3, vertex1).HitTest2d(ptTest);
	if (nHit3 == 5)
	{
		return HIT_SIDE3;
	}
	
	if (nHit1 == 1 && nHit2 == 1 && nHit3 == 1)
	{
		return HIT_INSIDE; //全部在左边，因此在内部
	}

	return HIT_OUTSIDE; //外部
}

TGGeTriangle::TGGeTriangle(const TADSGePoint3d &pt1, const TADSGePoint3d &pt2, const TADSGePoint3d &pt3, int nFlag) 
	: vertex1(pt1), vertex2(pt2), vertex3(pt3), m_nFlag(nFlag)
{

}

TGGeTriangle::~TGGeTriangle()
{

}

int TGGeTriangle::IsInvisible() 
{
	return (m_nFlag == SIDE1_INVISIBLE + SIDE2_INVISIBLE + SIDE3_INVISIBLE);
}

void TGGeTriangle::AsFace(TGGe3DFace &face) const 
{
	face.SetVertex(0, vertex1);
	face.SetVertex(3, vertex1);
	face.SetVertex(1, vertex2);
	face.SetVertex(2, vertex3);

	face.SetVisible(0, !(m_nFlag & SIDE1_INVISIBLE));
	face.SetVisible(1, !(m_nFlag & SIDE2_INVISIBLE));
	face.SetVisible(2, !(m_nFlag & SIDE3_INVISIBLE));
}