一些概念

尺寸标注倾斜度
相对于水平X轴而言
尺寸标注样式字段
40 DIMSCALE 设置应用于标注变量（可指定大小、距离或偏移量）的全局比例因子
41 DIMASZ 控制尺寸线、引线箭头的大小
42 DIMEXO 指定尺寸界线偏离原点的距离
44 DIMEXE 指定尺寸线超出尺寸界线的距离
140 DIMTXT 指定标注文字的高度（除非当前文字样式具有固定的高度）
箭头
箭头大小为长度，高度则为0.2*箭头大小，若放不下，增加的引线长也为箭头长度即可。
文字倾斜角度
在文字样式中增加了倾斜角度
尺寸标注箭头太大时，autocad的处理方式
标注样式替代

代码实现

代码只是用来演示绘制思路，依赖其他一些代码，故不可直接运行。

总体思路

 //标注点auto pDimPointGeom = DrawDimPoints();if (pDimPointGeom) pRtOsgGeode->addDrawable(pDimPointGeom);//绘制尺寸标注线auto pDimLineGeom = DrawDimLine();if (pDimLineGeom) pRtOsgGeode->addDrawable(pDimLineGeom);//绘制两根尺寸界线auto pDimBorderLineGeom = DrawDimBorderLine();if (pDimBorderLineGeom) pRtOsgGeode->addDrawable(pDimBorderLineGeom);//绘制箭头auto pArrowGeom = DrawArrow();if (pArrowGeom) pRtOsgGeode->addDrawable(pArrowGeom);//绘制文字DrawDimText(nModelFlag, pRtOsgGeode);

部分代码

osg::ref_ptr<osg::Drawable> DrawerGMAlignedDimension::DrawDimPoints()
{osg::Geometry* pDimPointGeom = new osg::Geometry();osg::Vec3dArray* pVertexArray = new osg::Vec3dArray();pVertexArray->push_back(osg::Vec3d(m_ptDimPoint1.x,m_ptDimPoint1.y, m_ptDimPoint1.z));pVertexArray->push_back(osg::Vec3d(m_ptDimPoint2.x,m_ptDimPoint2.y, m_ptDimPoint2.z));pDimPointGeom->setVertexArray(pVertexArray);pDimPointGeom->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::POINTS,0, pVertexArray->size()));return pDimPointGeom;
}osg::ref_ptr<osg::Drawable> DrawerGMAlignedDimension::DrawDimLine()
{AcGeVector3d vDimPtToDimLineOffset = m_ptDimLinePoint - m_ptDimPoint2;//标注点到标注线的偏移向量AcGePoint3d ptDimLineStart = m_ptDimPoint1 + vDimPtToDimLineOffset;//标注线起点AcGePoint3d ptDimLineEnd = m_ptDimPoint2 + vDimPtToDimLineOffset;//标注线末点osg::Geometry* pDimLineGeom = new osg::Geometry();osg::Vec3dArray* pVertexArray = new osg::Vec3dArray();pVertexArray->push_back(osg::Vec3d(ptDimLineStart.x,ptDimLineStart.y, ptDimLineStart.z));pVertexArray->push_back(osg::Vec3d(ptDimLineEnd.x,ptDimLineEnd.y, ptDimLineEnd.z));pDimLineGeom->setVertexArray(pVertexArray);pDimLineGeom->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::LINES,0, pVertexArray->size()));return pDimLineGeom;
}osg::ref_ptr<osg::Drawable> DrawerGMAlignedDimension::DrawDimBorderLine()
{//标注点到标注线的偏移向量AcGeVector3d vDimPtToDimLineOffset = m_ptDimLinePoint - m_ptDimPoint2;//dxf文档中说标注点在第二根线上，不能由倾斜度纠正出标注点，//因为autocad带倾斜的标注就没导出这个倾斜度AcGeVector3d vBorderDir = m_ptDimLinePoint - m_ptDimPoint2;vBorderDir.normalize();//第一根界线AcGePoint3d ptBorder1Start = m_ptDimPoint1 + vBorderDir * (m_dDIMSCALE*m_dDIMEXO);AcGePoint3d ptBorder1End = m_ptDimPoint1 + vDimPtToDimLineOffset + vBorderDir *m_dDIMSCALE * m_dDIMEXE;//第二根界线AcGePoint3d ptBorder2Start = m_ptDimPoint2 + vBorderDir * (m_dDIMSCALE*m_dDIMEXO);AcGePoint3d ptBorder2End = m_ptDimPoint2 + vDimPtToDimLineOffset + vBorderDir *m_dDIMSCALE * m_dDIMEXE;osg::Geometry* pBorderLineGeom = new osg::Geometry();osg::Vec3dArray* pVertexArray = new osg::Vec3dArray();pVertexArray->push_back(osg::Vec3d(ptBorder1Start.x,ptBorder1Start.y, ptBorder1Start.z));pVertexArray->push_back(osg::Vec3d(ptBorder1End.x,ptBorder1End.y, ptBorder1End.z));pVertexArray->push_back(osg::Vec3d(ptBorder2Start.x,ptBorder2Start.y, ptBorder2Start.z));pVertexArray->push_back(osg::Vec3d(ptBorder2End.x,ptBorder2End.y, ptBorder2End.z));pBorderLineGeom->setVertexArray(pVertexArray);pBorderLineGeom->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::LINES,0, pVertexArray->size()));return pBorderLineGeom;
}osg::ref_ptr<osg::Drawable> DrawerGMAlignedDimension::DrawArrow()
{AcGeVector3d vDimPtToDimLineOffset = m_ptDimLinePoint - m_ptDimPoint2;标注点到标注线的偏移向量//获取箭头大小//箭头大小为长度，高度的一半为0.2*大小，若放不下，增加的引线长也为箭头长度即可。double dArrowSize = m_dDIMASZ * m_dDIMSCALE;//计算箭头水平、垂直方向需要的偏移向量AcGeVector3d vDimLineDir = m_ptDimPoint2 - m_ptDimPoint1;//标注线方向 AcGeVector3d vArrowHOffset = vDimLineDir; //箭头水平方向 AcGeVector3d vArrowVOffset = vDimLineDir; //箭头垂直方向vArrowVOffset.rotateBy(PI / 2.0, AcGeVector3d::kZAxis);vArrowHOffset.normalize();vArrowVOffset.normalize();vArrowHOffset = vArrowHOffset * dArrowSize; //箭头水平偏移向量vArrowVOffset = vArrowVOffset * dArrowSize * 0.2; //箭头垂直方向偏移向量osg::Geometry* pArrowGeom = new osg::Geometry();osg::Vec3dArray* pVertexArray = new osg::Vec3dArray();//起点箭头{AcGePoint3d ptDimLineStart = m_ptDimPoint1 + vDimPtToDimLineOffset;//标注线起点AcGePoint3d ptFirst, ptSencond, ptThird;ptFirst = (ptDimLineStart + vArrowHOffset) + vArrowVOffset;ptSencond = (ptDimLineStart + vArrowHOffset) - vArrowVOffset;ptThird = ptDimLineStart;pVertexArray->push_back( osg::Vec3d(ptFirst.x, ptFirst.y, ptFirst.z)); //start pointpVertexArray->push_back(osg::Vec3d(ptSencond.x, ptSencond.y, ptSencond.z)); //same as start pointpVertexArray->push_back(osg::Vec3d(ptThird.x, ptThird.y, ptThird.z));}//末点箭头{AcGePoint3d ptDimLineEnd = m_ptDimPoint2 + vDimPtToDimLineOffset;//标注线末点AcGePoint3d ptFirst, ptSencond, ptThird;ptFirst = (ptDimLineEnd - vArrowHOffset) + vArrowVOffset;ptSencond = (ptDimLineEnd - vArrowHOffset) - vArrowVOffset;ptThird = ptDimLineEnd;pVertexArray->push_back(osg::Vec3d(ptFirst.x, ptFirst.y, ptFirst.z)); //start pointpVertexArray->push_back(osg::Vec3d(ptSencond.x, ptSencond.y, ptSencond.z)); //same as start pointpVertexArray->push_back(osg::Vec3d(ptThird.x, ptThird.y, ptThird.z));}pArrowGeom->setVertexArray(pVertexArray);pArrowGeom->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::TRIANGLES, 0, pVertexArray->size()));return pArrowGeom;
}void DrawerGMAlignedDimension::DrawDimText(INT nModelFlag,osg::ref_ptr<osg::Geode>& pRtOsgGeode)
{if (!m_pGRSolidFactoryImp){return;}////暂只实现了文字居中、放置上标注线上方的逻辑////标注文字值，要处理使用测量值的情况CString strDimText = m_strDimText;if (strDimText.IsEmpty())//文字替换为空，则使用测量值{double dDistance = m_ptDimPoint1.distanceTo(m_ptDimPoint2);switch (m_nDIMDEC){case 0:strDimText.Format(_T("%.0f"), dDistance);break;case 1:strDimText.Format(_T("%.1f"), dDistance);break;case 2:strDimText.Format(_T("%.2f"), dDistance);break;case 3:strDimText.Format(_T("%.3f"), dDistance);break;case 4:strDimText.Format(_T("%.4f"), dDistance);break;case 5:strDimText.Format(_T("%.5f"), dDistance);break;case 6:strDimText.Format(_T("%.6f"), dDistance);break;default:strDimText.Format(_T("%.0f"), dDistance);}RemoveBackZero(strDimText);}//文字标注方向AcGeVector3d vDimTextDir = (m_ptDimPoint2 - m_ptDimPoint1).normal();//实现居中、上方的文字位置 shanql 2022.7.25//文字延着标注线垂直方向向上偏移指定距离。//标注线方向的确定： 标注方向 = 标注第二点 - 标注第一点//1、使用点积判断//若标注方向与x轴正向平行，标注方向取+x;//否则，若标注方向与x轴垂直，标注方向取+y;//否则，若标注方向与x轴点积 < 0, 则标注方向取反//否则标注方向不变////2、使用angleTo求出两向量[0-pi]的夹角//若为0或pi，则表示与x轴平行，标注方向取+x//否则若为pi/2, 则表示与x轴垂直，标注方向取+y;//否则若>pi/2, 则标注方向取反//否则标注方向不变//ptTextPosTemp = ptDimMid + (m_dDIMGAP + m_dDIMTXT / 2.0) * m_dDIMSCALE * vecTextOffsetDir;if (vDimTextDir.isCodirectionalTo(AcGeVector3d::kXAxis)){//平行x轴vDimTextDir = AcGeVector3d::kXAxis;}else if (vDimTextDir.isPerpendicularTo(AcGeVector3d::kXAxis)){//垂直x轴vDimTextDir = AcGeVector3d::kYAxis;}else{if (vDimTextDir.angleTo(AcGeVector3d::kXAxis) > PI / 2.0){vDimTextDir = -vDimTextDir;}}std::shared_ptr<GMText> pGMText = std::make_shared<GMText>(strDimText);pGMText->SetExtendDir(vDimTextDir);pGMText->SetNormal(AcGeVector3d::kZAxis);AcGePoint3d ptTextPosTemp = m_ptTextPos;if (ptTextPosTemp.isEqualTo(AcGePoint3d::kOrigin)){AcGeVector3d vecTextOffsetDir = vDimTextDir;vecTextOffsetDir.rotateBy(PI / 2.0, AcGeVector3d::kZAxis);//求出标注中点AcGeVector3d vDimPtToDimLineOffset = m_ptDimLinePoint - m_ptDimPoint2;//标注点到标注线的偏移向量AcGePoint3d ptDimLineStart = m_ptDimPoint1 + vDimPtToDimLineOffset;//标注线起点AcGePoint3d ptDimLineEnd = m_ptDimPoint2 + vDimPtToDimLineOffset;//标注线末点AcGePoint3d ptDimMid = (ptDimLineStart + ptDimLineEnd.asVector()) / 2.0;//求出文字位置ptTextPosTemp = ptDimMid + (m_dDIMGAP + m_dDIMTXT / 2.0) * m_dDIMSCALE * vecTextOffsetDir;}pGMText->SetPosition(ptTextPosTemp);//文字位置 pGMText->SetAttachment(GMText::AttachmentType::MiddleCenter);double dTextHeight = m_dDIMTXT * m_dDIMSCALE;pGMText->SetHeight(dTextHeight);//文字高度pGMText->SetWidth(dTextHeight*1.0);m_pGRSolidFactoryImp->Create(pGMText, nModelFlag, pRtOsgGeode);
}

运行截图

与autocad的对比图

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DXF笔记：对齐尺寸标注的绘制

一些概念

代码实现

运行截图

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