121 lines
2.5 KiB
C++
121 lines
2.5 KiB
C++
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//-----------------------------------------------------------------------------+
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// Copyright (C), 1998-2007, SH Software Co. Ltd.
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// = FileName : XTriangle 类
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// = Version : ver2.0
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// = Author : zjq
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// = CreateDate : 2002-09-09
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// = Description: XTriangle 类定义
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// = Maintainers:
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//
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//-----------------------------------------------------------------------------+
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#include "StdAfx.h"
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#include "XTriangle.h"
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#include "XLine.h"
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#include "XPrivateGlobalFunc.h"
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#include "XGlobalCurveFunc.h"
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#include "XCurveInline.h"
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void XTriangle::Ecs2Wcs(XVector3D vtEcs)
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{
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vertex1 = XPrivate::Ecs2Wcs(vertex1, vtEcs);
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vertex2 = XPrivate::Ecs2Wcs(vertex2, vtEcs);
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vertex3 = XPrivate::Ecs2Wcs(vertex3, vtEcs);
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}
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void XTriangle::Wcs2Ecs(XVector3D vtEcs)
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{
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vertex1 = XPrivate::Wcs2Ecs(vertex1, vtEcs);
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vertex2 = XPrivate::Wcs2Ecs(vertex2, vtEcs);
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vertex3 = XPrivate::Wcs2Ecs(vertex3, vtEcs);
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}
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// 判断三角形是否退化为线或点
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int XTriangle::IsLinear()
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{
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XLine ln(vertex1, vertex2);
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if (ln.GetLength() < 1E-9)
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{
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return 1;
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}
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int nPrFlag = vertex3 & ln;
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if (nPrFlag != PR_OUTSIDE)
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{
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return 1;
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}
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return 0;
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}
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// 1~3－命中1～3点；-1~-3 －命中1~3边；0－外部；4－内部
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int XTriangle::HitTest2d(const XPoint &ptTest) const
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{
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// 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
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int nHit1 = XLine(vertex1, vertex2).HitTest2d(ptTest);
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if (nHit1 == 3)
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{
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return HIT_VERTEX1; // verttex1
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}
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if (nHit1 == 4)
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{
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return HIT_VERTEX2;
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}
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if (nHit1 == 5)
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{
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return HIT_SIDE1;
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}
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int nHit2 = XLine(vertex2, vertex3).HitTest2d(ptTest);
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if (nHit2 == 4)
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{
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return HIT_VERTEX3;
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}
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if (nHit2 == 5)
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{
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return HIT_SIDE2;
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}
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int nHit3 = XLine(vertex3, vertex1).HitTest2d(ptTest);
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if (nHit3 == 5)
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{
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return HIT_SIDE3;
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}
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if (nHit1 == 1 && nHit2 == 1 && nHit3 == 1)
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{
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return HIT_INSIDE; //全部在左边，因此在内部
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}
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return HIT_OUTSIDE; //外部
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}
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XTriangle::XTriangle(const XPoint &pt1, const XPoint &pt2, const XPoint &pt3, int nFlag)
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: vertex1(pt1), vertex2(pt2), vertex3(pt3), m_nFlag(nFlag)
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{
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}
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XTriangle::~XTriangle()
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{
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}
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int XTriangle::IsInvisible()
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{
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return (m_nFlag == SIDE1_INVISIBLE + SIDE2_INVISIBLE + SIDE3_INVISIBLE);
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}
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void XTriangle::AsFace(X3DFace &face) const
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{
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face.SetVertex(0, vertex1);
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face.SetVertex(3, vertex1);
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face.SetVertex(1, vertex2);
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face.SetVertex(2, vertex3);
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face.SetVisible(0, !(m_nFlag & SIDE1_INVISIBLE));
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face.SetVisible(1, !(m_nFlag & SIDE2_INVISIBLE));
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face.SetVisible(2, !(m_nFlag & SIDE3_INVISIBLE));
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}
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