[TD]Extent Dimensions

2019-10-22 20:28:05 -04:00
parent 25bc2af307
commit 88b07896e6
23 changed files with 3229 additions and 47 deletions
--- a/src/Mod/TechDraw/App/AppTechDraw.cpp
+++ b/src/Mod/TechDraw/App/AppTechDraw.cpp
@@ -27,6 +27,7 @@
 #include "DrawViewSection.h"
 #include "DrawViewAnnotation.h"
 #include "DrawViewDimension.h"
+#include "DrawViewDimExtent.h"
 #include "DrawProjGroupItem.h"
 #include "DrawProjGroup.h"
 #include "DrawViewSymbol.h"
@@ -86,6 +87,7 @@ PyMOD_INIT_FUNC(TechDraw)
    TechDraw::DrawViewSection     ::init();
    TechDraw::DrawViewMulti       ::init();
    TechDraw::DrawViewDimension   ::init();
+    TechDraw::DrawViewDimExtent   ::init();
    TechDraw::DrawProjGroup       ::init();
    TechDraw::DrawProjGroupItem   ::init();
    TechDraw::DrawViewDetail      ::init();
--- a/src/Mod/TechDraw/App/AppTechDrawPy.cpp
+++ b/src/Mod/TechDraw/App/AppTechDrawPy.cpp
@@ -70,7 +70,7 @@
 #include "DrawUtil.h"
 #include "DrawProjGroup.h"
 #include "DrawProjGroupItem.h"
-
+#include "DrawDimHelper.h"

 namespace TechDraw {
 //module level static C++ functions go here
@@ -113,6 +113,16 @@ public:
        add_varargs_method("findCentroid",&Module::findCentroid,
            "vector = findCentroid(shape,direction): finds geometric centroid of shape looking in direction."
        );
+        add_varargs_method("makeExtentDim",&Module::makeExtentDim,
+            "makeExtentDim(DrawViewPart, [edges], direction) -- draw horizontal or vertical extent dimension for edges (or all of DrawViewPart if edge list is empty. direction:  0 - Horizontal, 1 - Vertical."
+        );
+        add_varargs_method("makeDistanceDim",&Module::makeDistanceDim,
+            "makeDistanceDim(DrawViewPart, dimType, fromPoint, toPoint) -- draw a Length dimension between fromPoint to toPoint.  FromPoint and toPoint are unscaled 2d View points. dimType is one of ['Distance', 'DistanceX', 'DistanceY'."
+        );
+        add_varargs_method("makeDistanceDim3d",&Module::makeDistanceDim3d,
+            "makeDistanceDim(DrawViewPart, dimType, 3dFromPoint, 3dToPoint) -- draw a Length dimension between fromPoint to toPoint.  FromPoint and toPoint are unscaled 3d model points. dimType is one of ['Distance', 'DistanceX', 'DistanceY'."
+        );
+
        initialize("This is a module for making drawings"); // register with Python
    }
    virtual ~Module() {}
@@ -172,7 +182,7 @@ private:
            }
        }
        catch (Standard_Failure& e) {
-    
+
            throw Py::Exception(Part::PartExceptionOCCError, e.GetMessageString());
        }

@@ -230,7 +240,7 @@ private:
            }
        }
        catch (Standard_Failure& e) {
-    
+
            throw Py::Exception(Part::PartExceptionOCCError, e.GetMessageString());
        }

@@ -294,7 +304,7 @@ private:
            edgeList = DrawProjectSplit::getEdgesForWalker(shape,scale,dir);
        }
        catch (Standard_Failure& e) {
-    
+
            throw Py::Exception(Part::PartExceptionOCCError, e.GetMessageString());
        }

@@ -333,14 +343,14 @@ private:
        PyObject *viewObj;
        if (!PyArg_ParseTuple(args.ptr(), "O", &viewObj)) {
            throw Py::TypeError("expected (DrawViewPart)");
-        } 
+        }
        Py::String dxfReturn;

        try {
            App::DocumentObject* obj = 0;
            TechDraw::DrawViewPart* dvp = 0;
            Drawing::DXFOutput dxfOut;
-            std::string dxfText; 
+            std::string dxfText;
            std::stringstream ss;
            if (PyObject_TypeCheck(viewObj, &(TechDraw::DrawViewPartPy::Type))) {
                obj = static_cast<App::DocumentObjectPy*>(viewObj)->getDocumentObjectPtr();
@@ -388,7 +398,7 @@ private:
        PyObject *viewObj;
        if (!PyArg_ParseTuple(args.ptr(), "O", &viewObj)) {
            throw Py::TypeError("expected (DrawViewPart)");
-        } 
+        }
        Py::String svgReturn;
        std::string grpHead1 = "<g fill=\"none\" stroke=\"#000000\" stroke-opacity=\"1\" stroke-width=\"";
        std::string grpHead2 = "\" stroke-linecap=\"butt\" stroke-linejoin=\"miter\" stroke-miterlimit=\"4\">\n";
@@ -397,7 +407,7 @@ private:
            App::DocumentObject* obj = 0;
            TechDraw::DrawViewPart* dvp = 0;
            Drawing::SVGOutput svgOut;
-            std::string svgText; 
+            std::string svgText;
            std::stringstream ss;
            if (PyObject_TypeCheck(viewObj, &(TechDraw::DrawViewPartPy::Type))) {
                obj = static_cast<App::DocumentObjectPy*>(viewObj)->getDocumentObjectPtr();
@@ -488,7 +498,7 @@ private:
        gp_Trsf xLate;
        xLate.SetTranslation(gp_Vec(dvpX,dvpY,0.0));
        BRepBuilderAPI_Transform mkTrf(s, xLate);
-        s = mkTrf.Shape();                
+        s = mkTrf.Shape();
        writer.exportShape(s);
        s = TechDraw::mirrorShape(go->getVisOutline());
        mkTrf.Perform(s);
@@ -529,7 +539,7 @@ private:
            writer.exportShape(s);
        }
    }
-    
+
    Py::Object writeDXFView(const Py::Tuple& args)
    {
        PyObject *viewObj;
@@ -537,8 +547,8 @@ private:
        PyObject *alignObj = Py_True;
        if (!PyArg_ParseTuple(args.ptr(), "Oet|O", &viewObj, "utf-8",&name,&alignObj)) {
            throw Py::TypeError("expected (view,path");
-        } 
-        
+        }
+
        std::string filePath = std::string(name);
        std::string layerName = "none";
        PyMem_Free(name);
@@ -557,7 +567,7 @@ private:
            if (PyObject_TypeCheck(viewObj, &(TechDraw::DrawViewPartPy::Type))) {
                obj = static_cast<App::DocumentObjectPy*>(viewObj)->getDocumentObjectPtr();
                dvp = static_cast<TechDraw::DrawViewPart*>(obj);
-                
+
                layerName = dvp->getNameInDocument();
                writer.setLayerName(layerName);
                write1ViewDxf(writer,dvp,align);
@@ -578,7 +588,7 @@ private:
        if (!PyArg_ParseTuple(args.ptr(), "Oet", &pageObj, "utf-8",&name)) {
            throw Py::TypeError("expected (page,path");
        }
-        
+
        std::string filePath = std::string(name);
        std::string layerName = "none";
        PyMem_Free(name);
@@ -644,9 +654,9 @@ private:
                            Base::Vector3d norm(-dimLine.y,dimLine.x,0.0);
                            norm.Normalize();
                            lineLocn = lineLocn + (norm * gap);
-                            Base::Vector3d extLine1Start = Base::Vector3d(pts.first.x,-pts.first.y,0.0) + 
+                            Base::Vector3d extLine1Start = Base::Vector3d(pts.first.x,-pts.first.y,0.0) +
                                                           Base::Vector3d(parentX,parentY,0.0);
-                            Base::Vector3d extLine2Start = Base::Vector3d(pts.second.x, -pts.second.y, 0.0) + 
+                            Base::Vector3d extLine2Start = Base::Vector3d(pts.second.x, -pts.second.y, 0.0) +
                                                           Base::Vector3d(parentX,parentY,0.0);
                            writer.exportLinearDim(textLocn, lineLocn, extLine1Start, extLine2Start, dimText);
                        } else if (dvd->Type.isValue("Angle")) {
@@ -733,9 +743,118 @@ private:
        return Py::asObject(result);
    }

+    Py::Object makeExtentDim(const Py::Tuple& args)
+    {
+        PyObject* pDvp;
+        PyObject* pEdgeList;
+        int direction = 0;  //Horizontal
+        TechDraw::DrawViewPart* dvp = nullptr;
+
+        if (!PyArg_ParseTuple(args.ptr(), "OO!i", &pDvp, &(PyList_Type), &pEdgeList, &direction)) {
+            throw Py::TypeError("expected (DrawViewPart, listofedgesnames, direction");
+        }
+        if (PyObject_TypeCheck(pDvp, &(TechDraw::DrawViewPartPy::Type))) {
+            App::DocumentObject* obj = static_cast<App::DocumentObjectPy*>(pDvp)->getDocumentObjectPtr();
+            dvp = static_cast<TechDraw::DrawViewPart*>(obj);
+        }
+
+        std::vector<std::string> edgeList;
+        try {
+            Py::Sequence list(pEdgeList);
+            for (Py::Sequence::iterator it = list.begin(); it != list.end(); ++it) {
+                if (PyUnicode_Check((*it).ptr())) {
+                    std::string temp = PyUnicode_AsUTF8((*it).ptr());
+                    edgeList.push_back(temp);
+                }
+            }
+        }
+        catch (Standard_Failure& e) {
+
+            throw Py::Exception(Part::PartExceptionOCCError, e.GetMessageString());
+        }
+
+        DrawDimHelper::makeExtentDim(dvp,
+                                     edgeList,
+                                     direction);
+        return Py::None();
+    }
+
+    Py::Object makeDistanceDim(const Py::Tuple& args)
+    {
+        PyObject* pDvp;
+        PyObject* pDimType;
+        PyObject* pFrom;
+        PyObject* pTo;
+        TechDraw::DrawViewPart* dvp = nullptr;
+        std::string dimType;
+        Base::Vector3d from;
+        Base::Vector3d to;
+
+        if (!PyArg_ParseTuple(args.ptr(), "OOOO", &pDvp, &pDimType, &pFrom, &pTo)) {
+            throw Py::TypeError("expected (DrawViewPart, dimType, from, to");
+        }
+        //TODO: errors for all the type checks
+        if (PyObject_TypeCheck(pDvp, &(TechDraw::DrawViewPartPy::Type))) {
+                App::DocumentObject* obj = static_cast<App::DocumentObjectPy*>(pDvp)->getDocumentObjectPtr();
+                dvp = static_cast<TechDraw::DrawViewPart*>(obj);
+        }
+        if (PyUnicode_Check(pDimType)) {
+            dimType = PyUnicode_AsUTF8(pDimType);
+        }
+        if (PyObject_TypeCheck(pFrom, &(Base::VectorPy::Type))) {
+            from = static_cast<Base::VectorPy*>(pFrom)->value();
+        }
+        if (PyObject_TypeCheck(pTo, &(Base::VectorPy::Type))) {
+            to = static_cast<Base::VectorPy*>(pTo)->value();
+        }
+        DrawDimHelper::makeDistDim(dvp,
+                                   dimType,
+                                   from,
+                                   to);
+
+        return Py::None();
+    }
+
+    Py::Object makeDistanceDim3d(const Py::Tuple& args)
+    {
+        PyObject* pDvp;
+        PyObject* pDimType;
+        PyObject* pFrom;
+        PyObject* pTo;
+        TechDraw::DrawViewPart* dvp = nullptr;
+        std::string dimType;
+        Base::Vector3d from;
+        Base::Vector3d to;
+
+        if (!PyArg_ParseTuple(args.ptr(), "OOOO", &pDvp, &pDimType, &pFrom, &pTo)) {
+            throw Py::TypeError("expected (DrawViewPart, dimType, from, to");
+        }
+        //TODO: errors for all the type checks
+        if (PyObject_TypeCheck(pDvp, &(TechDraw::DrawViewPartPy::Type))) {
+                App::DocumentObject* obj = static_cast<App::DocumentObjectPy*>(pDvp)->getDocumentObjectPtr();
+                dvp = static_cast<TechDraw::DrawViewPart*>(obj);
+        }
+        if (PyUnicode_Check(pDimType)) {
+            dimType = PyUnicode_AsUTF8(pDimType);
+        }
+        if (PyObject_TypeCheck(pFrom, &(Base::VectorPy::Type))) {
+            from = static_cast<Base::VectorPy*>(pFrom)->value();
+        }
+        if (PyObject_TypeCheck(pTo, &(Base::VectorPy::Type))) {
+            to = static_cast<Base::VectorPy*>(pTo)->value();
+        }
+        from = DrawUtil::invertY(dvp->projectPoint(from));
+        to   = DrawUtil::invertY(dvp->projectPoint(to));
+        DrawDimHelper::makeDistDim(dvp,
+                                   dimType,
+                                   from,
+                                   to);
+
+        return Py::None();
+    }
 };

-PyObject* initModule()
+ PyObject* initModule()
 {
    return (new Module)->module().ptr();
 }
--- a/src/Mod/TechDraw/App/CMakeLists.txt
+++ b/src/Mod/TechDraw/App/CMakeLists.txt
@@ -51,6 +51,7 @@ generate_from_xml(DrawSVGTemplatePy)
 generate_from_xml(DrawViewSymbolPy)
 generate_from_xml(DrawViewClipPy)
 generate_from_xml(DrawViewDimensionPy)
+generate_from_xml(DrawViewDimExtentPy)
 generate_from_xml(DrawHatchPy)
 generate_from_xml(DrawGeomHatchPy)
 generate_from_xml(DrawViewCollectionPy)
@@ -96,6 +97,8 @@ SET(Draw_SRCS
    DrawViewCollection.h
    DrawViewDimension.cpp
    DrawViewDimension.h
+    DrawViewDimExtent.cpp
+    DrawViewDimExtent.h
    DrawViewBalloon.cpp
    DrawViewBalloon.h
    DrawViewSection.cpp
@@ -135,6 +138,8 @@ SET(TechDraw_SRCS
    DrawUtil.h
    ShapeExtractor.cpp
    ShapeExtractor.h
+    DrawDimHelper.cpp
+    DrawDimHelper.h
    HatchLine.cpp
    HatchLine.h
    PreCompiled.cpp
@@ -183,6 +188,8 @@ SET(Python_SRCS
    DrawViewClipPyImp.cpp
    DrawViewDimensionPy.xml
    DrawViewDimensionPyImp.cpp
+    DrawViewDimExtentPy.xml
+    DrawViewDimExtentPyImp.cpp
    DrawHatchPy.xml
    DrawHatchPyImp.cpp
    DrawGeomHatchPy.xml
--- a/src/Mod/TechDraw/App/Cosmetic.cpp
+++ b/src/Mod/TechDraw/App/Cosmetic.cpp
@@ -140,22 +140,30 @@ CosmeticVertex::CosmeticVertex() : TechDraw::Vertex()
    App::Color fcColor;
    fcColor.setPackedValue(hGrp->GetUnsigned("VertexColor", 0x00000000));

+    permaPoint = Base::Vector3d(0.0, 0.0, 0.0);
    linkGeom = -1;
    color = fcColor;
    size  = 3.0;
    style = 1;
    visible = true;
+    //TODO: sort out 2x visible variables
+    Vertex::visible = true;    //yuck
+    cosmetic = true;
+    

    createNewTag();
 }

 CosmeticVertex::CosmeticVertex(const TechDraw::CosmeticVertex* cv) : TechDraw::Vertex(cv)
 {
+    permaPoint = cv->permaPoint;
    linkGeom = cv->linkGeom;
    color = cv->color;
    size  = cv->size;
    style = cv->style;
    visible = cv->visible;
+    Vertex::visible = true;    //yuck
+    cosmetic = true;

    createNewTag();
 }
@@ -167,12 +175,15 @@ CosmeticVertex::CosmeticVertex(Base::Vector3d loc) : TechDraw::Vertex(loc)
    App::Color fcColor;
    fcColor.setPackedValue(hGrp->GetUnsigned("VertexColor", 0xff000000));

+    permaPoint = loc;
    linkGeom = -1;
    color = fcColor;
    //TODO: size = hGrp->getFloat("VertexSize",30.0);
    size  = 30.0;
    style = 1;        //TODO: implement styled vertexes
    visible = true;
+    Vertex::visible = true;    //yuck
+    cosmetic = true;

    createNewTag();

@@ -181,14 +192,22 @@ CosmeticVertex::CosmeticVertex(Base::Vector3d loc) : TechDraw::Vertex(loc)
 std::string CosmeticVertex::toString(void) const
 {
    std::stringstream ss;
+    ss << permaPoint.x << "," <<
+          permaPoint.y << "," <<
+          permaPoint.z << "," <<
+          " / ";
    ss << point().x << "," <<
          point().y << "," <<
          point().z << "," <<
-
-          linkGeom << "," << 
+          " / " <<
+          linkGeom << "," <<
+          " / " <<
          color.asHexString() << ","  <<
+          " / " <<
          size << "," <<
+          " / " <<
          style << ","  <<
+          " / " <<
          visible;
    return ss.str();
 }
@@ -202,6 +221,11 @@ unsigned int CosmeticVertex::getMemSize (void) const
 void CosmeticVertex::Save(Base::Writer &writer) const
 {
    TechDraw::Vertex::Save(writer);
+    writer.Stream() << writer.ind() << "<PermaPoint "
+                << "X=\"" <<  permaPoint.x <<
+                "\" Y=\"" <<  permaPoint.y <<
+                "\" Z=\"" <<  permaPoint.z <<
+                 "\"/>" << endl;
    writer.Stream() << writer.ind() << "<LinkGeom value=\"" <<  linkGeom << "\"/>" << endl;
    writer.Stream() << writer.ind() << "<Color value=\"" <<  color.asHexString() << "\"/>" << endl;
    writer.Stream() << writer.ind() << "<Size value=\"" <<  size << "\"/>" << endl;
@@ -213,6 +237,10 @@ void CosmeticVertex::Save(Base::Writer &writer) const
 void CosmeticVertex::Restore(Base::XMLReader &reader)
 {
    TechDraw::Vertex::Restore(reader);
+    reader.readElement("PermaPoint");
+    permaPoint.x = reader.getAttributeAsFloat("X");
+    permaPoint.y = reader.getAttributeAsFloat("Y");
+    permaPoint.z = reader.getAttributeAsFloat("Z");
    reader.readElement("LinkGeom");
    linkGeom = reader.getAttributeAsInteger("value");
    reader.readElement("Color");
@@ -226,6 +254,12 @@ void CosmeticVertex::Restore(Base::XMLReader &reader)
    visible = (int)reader.getAttributeAsInteger("value")==0?false:true;
 }

+Base::Vector3d CosmeticVertex::scaled(double factor)
+{
+    pnt = permaPoint * factor;
+    return pnt;
+}    
+
 boost::uuids::uuid CosmeticVertex::getTag() const
 {
    return tag;
--- a/src/Mod/TechDraw/App/Cosmetic.h
+++ b/src/Mod/TechDraw/App/Cosmetic.h
@@ -23,7 +23,7 @@
 #ifndef TECHDRAW_COSMETIC_H
 #define TECHDRAW_COSMETIC_H

-# include <boost/uuid/uuid_io.hpp>
+#include <boost/uuid/uuid_io.hpp>

 #include <boost/uuid/uuid.hpp>
 #include <boost/uuid/uuid_generators.hpp>
@@ -77,6 +77,7 @@ public:
    std::string toString(void) const;
 /*    bool fromCSV(std::string& lineSpec);*/
    void dump(char* title);
+    Base::Vector3d scaled(double factor);

    // Persistence implementer ---------------------
    virtual unsigned int getMemSize(void) const;
@@ -87,14 +88,15 @@ public:
    CosmeticVertex* copy(void) const;
    CosmeticVertex* clone(void) const;

-    int            linkGeom;             //connection to corresponding "real" Vertex
+    Base::Vector3d permaPoint;           //permanent, unscaled value
+    int            linkGeom;             //connection to corresponding "geom" Vertex
    App::Color     color;
    double         size;
    int            style;
-    bool           visible;
+    bool           visible;              //base class vertex also has visible property

    boost::uuids::uuid getTag() const;
-    std::string getTagAsString(void) const;
+    virtual std::string getTagAsString(void) const;


 protected:
--- a/src/Mod/TechDraw/App/DrawDimHelper.cpp
+++ b/src/Mod/TechDraw/App/DrawDimHelper.cpp
@@ -0,0 +1,381 @@
+/***************************************************************************
+ *   Copyright (c) 2019 WandererFan <wandererfan@gmail.com>                *
+ *                                                                         *
+ *   This file is part of the FreeCAD CAx development system.              *
+ *                                                                         *
+ *   This library is free software; you can redistribute it and/or         *
+ *   modify it under the terms of the GNU Library General Public           *
+ *   License as published by the Free Software Foundation; either          *
+ *   version 2 of the License, or (at your option) any later version.      *
+ *                                                                         *
+ *   This library  is distributed in the hope that it will be useful,      *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU Library General Public License for more details.                  *
+ *                                                                         *
+ *   You should have received a copy of the GNU Library General Public     *
+ *   License along with this library; see the file COPYING.LIB. If not,    *
+ *   write to the Free Software Foundation, Inc., 59 Temple Place,         *
+ *   Suite 330, Boston, MA  02111-1307, USA                                *
+ *                                                                         *
+ ***************************************************************************/
+
+#include "PreCompiled.h"
+
+#ifndef _PreComp_
+# include <sstream>
+# include <cstring>
+# include <cstdlib>
+#include <cmath>
+#include <float.h>
+#include <string>
+# include <exception>
+
+#include <Precision.hxx>
+#include <Bnd_Box2d.hxx>
+#include <BndLib_Add2dCurve.hxx>
+#include <Extrema_ExtCC2d.hxx>
+#include <Geom2dAdaptor_Curve.hxx>
+#include <Geom2d_Curve.hxx>
+#include <Geom2d_Line.hxx>
+#include <Geom2dAPI_ProjectPointOnCurve.hxx>
+#include <GeomAPI.hxx>
+#include <Geom_Curve.hxx>
+#include <Geom_TrimmedCurve.hxx>
+#include <gp_Pnt2d.hxx>
+#include <gp_Pln.hxx>
+#include <TopoDS_Edge.hxx>
+#endif
+
+#include <App/Application.h>
+#include <App/Document.h>
+#include <App/DocumentObject.h>
+
+#include <Base/BoundBox.h>
+#include <Base/Console.h>
+#include <Base/Interpreter.h>
+#include <Base/Parameter.h>
+#include <Base/Vector3D.h>
+
+#include "Geometry.h"
+#include "DrawUtil.h"
+#include "Cosmetic.h"
+#include "DrawPage.h"
+#include "DrawViewPart.h"
+#include "DrawViewDimension.h"
+#include "DrawViewDimExtent.h"
+
+#include "DrawDimHelper.h"
+
+#define HORIZONTAL 0
+#define VERTICAL 1
+#define LENGTH 2
+
+using namespace TechDraw;
+
+hTrimCurve::hTrimCurve(Handle(Geom2d_Curve) hCurveIn,
+                        double parm1,
+                        double parm2) :
+    hCurve(hCurveIn),
+    first(parm1),
+    last(parm2)
+{
+    //just a convenient struct for now.
+}
+
+//All this occ math is being done on on edges(&vertices) that have been through the center/scale/mirror process.
+
+//TODO: this needs to be exposed to Python
+void DrawDimHelper::makeExtentDim(DrawViewPart* dvp,
+                                  std::vector<std::string> edgeNames,
+                                  int direction)
+{
+//    Base::Console().Message("DDH::makeExtentDim() - dvp: %s edgeNames: %d\n", 
+//                            dvp->Label.getValue(), edgeNames.size());
+    if (dvp == nullptr) {
+//        Base::Console().Message("DDH::makeExtentDim - dvp: %X\n", dvp);
+        return;
+    }
+
+    std::string dimType = "DistanceX";
+    int dimNum = 0;
+    if (direction == VERTICAL) {
+        dimType = "DistanceY";
+        dimNum = 1;
+    }
+
+    std::pair<Base::Vector3d, Base::Vector3d> endPoints = minMax(dvp,
+                                                                 edgeNames,
+                                                                 direction);
+    Base::Vector3d refMin = endPoints.first;
+    Base::Vector3d refMax = endPoints.second;
+
+    //pause recomputes
+    dvp->getDocument()->setStatus(App::Document::Status::SkipRecompute, true);
+
+    DrawViewDimension* distDim = makeDistDim(dvp, dimType, refMin, refMax, true);
+    std::string dimName = distDim->getNameInDocument();
+    Base::Interpreter().runStringArg("App.activeDocument().%s.DirExtent = %d",
+                                     dimName.c_str(), dimNum);
+    DrawViewDimExtent* extDim = dynamic_cast<DrawViewDimExtent*>(distDim);
+    extDim->Source.setValue(dvp, edgeNames);
+
+    //continue recomputes
+    dvp->getDocument()->setStatus(App::Document::Status::SkipRecompute, false);
+    extDim->recomputeFeature();
+}
+
+std::pair<Base::Vector3d, Base::Vector3d> DrawDimHelper::minMax(DrawViewPart* dvp,
+                                  std::vector<std::string> edgeNames,
+                                  int direction)
+{
+//    Base::Console().Message("DDH::minMax()\n");
+    std::pair<Base::Vector3d, Base::Vector3d> result;
+    Base::Vector3d refMin;
+    Base::Vector3d refMax;
+
+    gp_Pnt stdOrg(0.0, 0.0, 0.0);
+    gp_Dir stdZ(0.0, 0.0, 1.0);
+    gp_Dir stdX(1.0, 0.0, 0.0);
+    gp_Ax3 projAx3(stdOrg, stdZ, stdX);
+    gp_Pln projPlane(projAx3);                     // OZX
+
+    std::vector<BaseGeom*> bgList;
+    if (!edgeNames.empty()) {
+        for (auto& n: edgeNames) {
+            if (!n.empty()) {
+                std::string geomType = DrawUtil::getGeomTypeFromName(n);
+                if (!n.empty() && (geomType == "Edge")) {
+                    int i = DrawUtil::getIndexFromName(n);
+                    BaseGeom* bg = dvp->getGeomByIndex(i);
+                    if (bg != nullptr) {
+                        bgList.push_back(bg);
+                    }
+                }
+            }
+        }
+    }
+
+    std::vector<BaseGeom*> selEdges = bgList;
+    if (selEdges.empty()) {
+        selEdges = dvp->getEdgeGeometry();                  //do the whole View
+    }
+
+    std::vector<Handle(Geom_Curve)> selCurves;
+    std::vector<hTrimCurve> hTCurve2dList;
+    for (auto& bg: selEdges) {
+        TopoDS_Edge e = bg->occEdge;
+        double first = 0.0;
+        double last = 0.0;
+        Handle(Geom_Curve) hCurve = BRep_Tool::Curve(e, first, last);
+        Handle(Geom2d_Curve) hCurve2 = GeomAPI::To2d (hCurve, projPlane);
+        hTrimCurve temp(hCurve2, first, last);
+        hTCurve2dList.push_back(temp);
+    }
+
+    //can't use Bnd_Box2d here as BndLib_Add2dCurve::Add adds the poles of splines to the box.
+    //poles are not neccessarily on the curve!  3d Bnd_Box does it properly. FC bbx3 is already calculated
+    //bbx3 is scaled??
+//    double scale = dvp->getScale();
+    
+    Base::BoundBox3d bbx3 = dvp->getBoundingBox();
+
+    double xMid = (bbx3.MaxX + bbx3.MinX) / 2.0;
+    double yMid = (bbx3.MaxY + bbx3.MinY) / 2.0;
+    
+    gp_Pnt2d rightMid(bbx3.MaxX, yMid);
+    gp_Pnt2d leftMid(bbx3.MinX, yMid);
+    gp_Pnt2d topMid(xMid, bbx3.MaxY);
+    gp_Pnt2d bottomMid(xMid, bbx3.MinY);
+    gp_Dir2d xDir(1.0, 0.0);
+    gp_Dir2d yDir(0.0, 1.0);
+
+    if (direction == HORIZONTAL) {
+        Handle(Geom2d_Line) boundaryLeft  = new Geom2d_Line(leftMid, yDir);
+        gp_Pnt2d leftPoint = findClosestPoint(hTCurve2dList,
+                                              boundaryLeft);
+        Handle(Geom2d_Line) boundaryRight  = new Geom2d_Line(rightMid, yDir);
+        gp_Pnt2d rightPoint = findClosestPoint(hTCurve2dList,
+                                               boundaryRight);
+
+        refMin = Base::Vector3d(leftPoint.X(), leftPoint.Y(), 0.0);
+        refMax = Base::Vector3d(rightPoint.X(), rightPoint.Y(), 0.0);
+
+    } else if (direction == VERTICAL) {
+        Handle(Geom2d_Line) boundaryBottom = new Geom2d_Line(bottomMid, xDir);
+        gp_Pnt2d bottomPoint = findClosestPoint(hTCurve2dList,
+                                                boundaryBottom);
+        Handle(Geom2d_Line) boundaryTop = new Geom2d_Line(topMid, xDir);
+        gp_Pnt2d topPoint = findClosestPoint(hTCurve2dList,
+                                             boundaryTop);
+        refMin = Base::Vector3d(bottomPoint.X(),bottomPoint.Y(), 0.0);
+        refMax = Base::Vector3d(topPoint.X(), topPoint.Y(), 0.0);
+    }
+
+    result.first = refMin;
+    result.second = refMax;
+    return result;
+}
+
+//given list of curves, find the closest point from any curve to a boundary
+//computation intensive for a cosmetic result.
+gp_Pnt2d DrawDimHelper::findClosestPoint(std::vector<hTrimCurve> hTCurve2dList,
+                                         Handle(Geom2d_Curve) boundary)
+{
+//    Base::Console().Message("DDH::findClosestPoint() - curves: %d\n", hTCurve2dList.size());
+//
+//find an extent point that is actually on one of the curves
+    gp_Pnt2d result(-1.0, -1.0);
+    Geom2dAdaptor_Curve aBoundary(boundary);
+
+    double globalNearDist = FLT_MAX;
+    gp_Pnt2d globalNearPoint;
+    bool found = false;
+    for (auto& hCurve2d : hTCurve2dList) {
+        Geom2dAdaptor_Curve aCurve(hCurve2d.hCurve,
+                                   hCurve2d.first,
+                                   hCurve2d.last);
+        Extrema_ExtCC2d mkExtr(aBoundary, aCurve);
+        if (mkExtr.IsDone()) {
+            double nearDist = FLT_MAX;
+            int nearIdx = 0;
+            gp_Pnt2d nearPoint;
+            if (mkExtr.NbExt() > 0) {
+                int stop = mkExtr.NbExt();
+                int i = 1;                      //this is OCC start (1) not conventional start (0)
+                for ( ; i <= stop; i++) {
+                    double dist = mkExtr.SquareDistance(i);
+                    if (dist < nearDist) {
+                        found = true;
+                        nearDist = dist;
+                        nearIdx = i;
+                        Extrema_POnCurv2d p1, p2;
+                        mkExtr.Points(nearIdx, p1, p2);
+                        nearPoint = p2.Value();
+                    }
+                }
+            } else {                             //no extrema? - might be a line parallel to boundary
+                if (mkExtr.IsParallel()) {
+                    //get midpoint of aCurve
+                    double mid   = (hCurve2d.first + hCurve2d.last) / 2.0;
+                    gp_Pnt2d midPoint = hCurve2d.hCurve->Value(mid);
+                    //get distance midpoint to boundary => nearDist
+                    Geom2dAPI_ProjectPointOnCurve mkProj(midPoint, boundary);
+                    double dist = mkProj.LowerDistance() * mkProj.LowerDistance();
+                    if (dist < nearDist) {
+                        found = true;
+                        nearDist = dist;
+                        nearPoint = mkProj.NearestPoint();
+                    }
+                } else {  //skew and no extrema?
+                    gp_Pnt2d pFirst = hCurve2d.hCurve->Value(hCurve2d.first);
+                    Geom2dAPI_ProjectPointOnCurve mkFirst(pFirst, boundary);
+                    double dist1 = mkFirst.LowerDistance() * mkFirst.LowerDistance();
+                    gp_Pnt2d pLast  = hCurve2d.hCurve->Value(hCurve2d.last);
+                    Geom2dAPI_ProjectPointOnCurve mkLast(pLast, boundary);
+                    double dist2 = mkLast.LowerDistance() * mkLast.LowerDistance();
+                    if (dist1 < dist2) {
+                        if (dist1 < nearDist) {
+                            found = true;
+                            nearDist = dist1;
+                            nearPoint = mkFirst.NearestPoint();
+                        }
+                    } else {
+                        if (dist2 < nearDist) {
+                            found = true;
+                            nearDist = dist2;
+                            nearPoint = mkLast.NearestPoint();
+                        }
+                    }
+                }
+            }
+            if (nearDist < globalNearDist) {
+                globalNearDist = nearDist;
+                globalNearPoint = nearPoint;
+            }
+        }
+    }
+    if (found) {
+        result = globalNearPoint;
+    }
+
+    return result;
+}
+
+//TODO: this needs to be exposed to Python
+DrawViewDimension* DrawDimHelper::makeDistDim(DrawViewPart* dvp,
+                                              std::string dimType,
+                                              Base::Vector3d inMin,
+                                              Base::Vector3d inMax,
+                                              bool extent)
+{
+//    Base::Console().Message("DDH::makeDistDim() - inMin: %s inMax: %s\n",
+//                            DrawUtil::formatVector(inMin).c_str(),
+//                            DrawUtil::formatVector(inMax).c_str());
+    TechDraw::DrawPage* page = dvp->findParentPage();
+    std::string pageName = page->getNameInDocument();
+
+    double scale = dvp->getScale();
+
+    TechDraw::DrawViewDimension *dim = 0;
+    App::Document* doc = dvp->getDocument();
+    std::string dimName = doc->getUniqueObjectName("Dimension");
+    if (extent) {
+        dimName = doc->getUniqueObjectName("DimExtent");
+    }
+
+    Base::Vector3d cleanMin = DrawUtil::invertY(inMin) / scale;
+    int idx1 = dvp->addCosmeticVertex(cleanMin);   //CV index
+    dvp->add1CVToGV(idx1);
+    Base::Vector3d cleanMax = DrawUtil::invertY(inMax) / scale;
+    int idx2 = dvp->addCosmeticVertex(cleanMax);
+    dvp->add1CVToGV(idx2);
+
+    CosmeticVertex* cv1 = dvp->getCosmeticVertexByIndex(idx1);
+    CosmeticVertex* cv2 = dvp->getCosmeticVertexByIndex(idx2);
+    int iGV1 = cv1->linkGeom;
+    int iGV2 = cv2->linkGeom;
+
+    std::vector<App::DocumentObject *> objs;
+    std::vector<std::string> subs;
+
+    std::stringstream ss;
+    ss << "Vertex" << iGV1;
+    std::string vertexName = ss.str();
+    subs.push_back(vertexName);
+    objs.push_back(dvp);
+
+    ss.clear();
+    ss.str("");
+    ss << "Vertex" << iGV2;
+    vertexName = ss.str();
+    subs.push_back(vertexName);
+    objs.push_back(dvp);
+
+    if (extent) {
+        Base::Interpreter().runStringArg("App.activeDocument().addObject('TechDraw::DrawViewDimExtent','%s')",
+                                         dimName.c_str());
+    } else {
+
+        Base::Interpreter().runStringArg("App.activeDocument().addObject('TechDraw::DrawViewDimension','%s')",
+                                         dimName.c_str());
+    }
+    Base::Interpreter().runStringArg("App.activeDocument().%s.Type = '%s'",
+                                     dimName.c_str(), dimType.c_str());
+    Base::Interpreter().runStringArg("App.activeDocument().%s.addView(App.activeDocument().%s)",
+                                     pageName.c_str(),dimName.c_str());
+
+
+    dim = dynamic_cast<TechDraw::DrawViewDimension *>(doc->getObject(dimName.c_str()));
+    if (!dim) {
+        throw Base::TypeError("DDH::makeDistDim - dim not found\n");
+    }
+    
+    dim->References2D.setValues(objs, subs);
+
+    dvp->requestPaint();
+    dim->recomputeFeature();
+
+    return dim;
+}
+
--- a/src/Mod/TechDraw/App/DrawDimHelper.h
+++ b/src/Mod/TechDraw/App/DrawDimHelper.h
@@ -0,0 +1,73 @@
+/***************************************************************************
+ *   Copyright (c) 2019 WandererFan <wandererfan@gmail.com>                *
+ *                                                                         *
+ *   This file is part of the FreeCAD CAx development system.              *
+ *                                                                         *
+ *   This library is free software; you can redistribute it and/or         *
+ *   modify it under the terms of the GNU Library General Public           *
+ *   License as published by the Free Software Foundation; either          *
+ *   version 2 of the License, or (at your option) any later version.      *
+ *                                                                         *
+ *   This library  is distributed in the hope that it will be useful,      *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU Library General Public License for more details.                  *
+ *                                                                         *
+ *   You should have received a copy of the GNU Library General Public     *
+ *   License along with this library; see the file COPYING.LIB. If not,    *
+ *   write to the Free Software Foundation, Inc., 59 Temple Place,         *
+ *   Suite 330, Boston, MA  02111-1307, USA                                *
+ *                                                                         *
+ ***************************************************************************/
+
+#ifndef _DrawDimHelper_h_
+#define _DrawDimHelper_h_
+
+#include <Standard_Handle.hxx>
+
+#include <string>
+#include <Base/Vector3D.h>
+
+class gp_Pnt2d;
+class Geom2d_Curve;
+
+namespace TechDraw
+{
+class BaseGeom;
+class DrawViewPart;
+
+class TechDrawExport hTrimCurve {
+    public:
+    hTrimCurve() {}
+    hTrimCurve(Handle(Geom2d_Curve) hCurveIn,
+               double parm1,
+               double parm2);
+    ~hTrimCurve() {}
+
+    Handle(Geom2d_Curve) hCurve;
+    double first;
+    double last;
+};
+
+
+/// Additional functions for working with Dimensions
+class TechDrawExport DrawDimHelper {
+    public:
+    static void makeExtentDim(DrawViewPart* dvp,
+//                              std::vector<TechDraw::BaseGeom*> selEdges,
+                              std::vector<std::string> edgeNames,
+                              int direction);
+    static gp_Pnt2d findClosestPoint(std::vector<hTrimCurve> hCurve2dList,
+                                   Handle(Geom2d_Curve) boundary);
+    static TechDraw::DrawViewDimension* makeDistDim(DrawViewPart* dvp,
+                                                    std::string dimType,
+                                                    Base::Vector3d refMin,
+                                                    Base::Vector3d refMax,
+                                                    bool extent = false);
+    static std::pair<Base::Vector3d, Base::Vector3d> minMax(DrawViewPart* dvp,
+                                                            std::vector<std::string> edgeNames,
+                                                            int direction);
+};
+
+} //end namespace TechDraw
+#endif
--- a/src/Mod/TechDraw/App/DrawUtil.cpp
+++ b/src/Mod/TechDraw/App/DrawUtil.cpp
@@ -309,6 +309,15 @@ std::string DrawUtil::formatVector(const gp_Dir& v)
    return result;
 }

+std::string DrawUtil::formatVector(const gp_Dir2d& v)
+{
+    std::string result;
+    std::stringstream builder;
+    builder << std::fixed << std::setprecision(3) ;
+    builder << " (" << v.X()  << "," << v.Y() <<  ") ";
+    result = builder.str();
+    return result;
+}
 std::string DrawUtil::formatVector(const gp_Vec& v)
 {
    std::string result;
@@ -329,6 +338,16 @@ std::string DrawUtil::formatVector(const gp_Pnt& v)
    return result;
 }

+std::string DrawUtil::formatVector(const gp_Pnt2d& v)
+{
+    std::string result;
+    std::stringstream builder;
+    builder << std::fixed << std::setprecision(3) ;
+    builder << " (" << v.X()  << "," << v.Y() << ") ";
+    result = builder.str();
+    return result;
+}
+
 std::string DrawUtil::formatVector(const QPointF& v)
 {
    std::string result;
--- a/src/Mod/TechDraw/App/DrawUtil.h
+++ b/src/Mod/TechDraw/App/DrawUtil.h
@@ -31,7 +31,9 @@

 #include <gp_Ax2.hxx>
 #include <gp_Dir.hxx>
+#include <gp_Dir2d.hxx>
 #include <gp_Pnt.hxx>
+#include <gp_Pnt2d.hxx>
 #include <gp_Vec.hxx>
 #include <TopoDS.hxx>
 #include <TopoDS_Vertex.hxx>
@@ -80,8 +82,10 @@ class TechDrawExport DrawUtil {
        static Base::Vector3d vertex2Vector(const TopoDS_Vertex& v);
        static std::string formatVector(const Base::Vector3d& v);
        static std::string formatVector(const gp_Dir& v);
+        static std::string formatVector(const gp_Dir2d& v);
        static std::string formatVector(const gp_Vec& v);
        static std::string formatVector(const gp_Pnt& v);
+        static std::string formatVector(const gp_Pnt2d& v);
        static std::string formatVector(const QPointF& v);

        static bool vectorLess(const Base::Vector3d& v1, const Base::Vector3d& v2);
--- a/src/Mod/TechDraw/App/DrawViewDimExtent.cpp
+++ b/src/Mod/TechDraw/App/DrawViewDimExtent.cpp
@@ -0,0 +1,218 @@
+/***************************************************************************
+ *   Copyright (c) 2019 Wandererfan <wandererfan@gmail.com>                *
+ *                                                                         *
+ *   This file is part of the FreeCAD CAx development system.              *
+ *                                                                         *
+ *   This library is free software; you can redistribute it and/or         *
+ *   modify it under the terms of the GNU Library General Public           *
+ *   License as published by the Free Software Foundation; either          *
+ *   version 2 of the License, or (at your option) any later version.      *
+ *                                                                         *
+ *   This library  is distributed in the hope that it will be useful,      *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU Library General Public License for more details.                  *
+ *                                                                         *
+ *   You should have received a copy of the GNU Library General Public     *
+ *   License along with this library; see the file COPYING.LIB. If not,    *
+ *   write to the Free Software Foundation, Inc., 59 Temple Place,         *
+ *   Suite 330, Boston, MA  02111-1307, USA                                *
+ *                                                                         *
+ ***************************************************************************/
+
+#include "PreCompiled.h"
+
+#ifndef _PreComp_
+# include <sstream>
+# include <cstring>
+# include <cstdlib>
+# include <exception>
+# include <QString>
+# include <QStringList>
+# include <QRegExp>
+
+#endif
+
+#include <QLocale>
+
+#include <App/Application.h>
+#include <App/Document.h>
+#include <Base/Console.h>
+#include <Base/Exception.h>
+#include <Base/Parameter.h>
+#include <Base/Quantity.h>
+#include <Base/Tools.h>
+#include <Base/UnitsApi.h>
+
+
+#include "Geometry.h"
+#include "DrawViewPart.h"
+#include "DrawViewDimExtent.h"
+#include "DrawDimHelper.h"
+#include "DrawUtil.h"
+#include "LineGroup.h"
+
+#include <Mod/TechDraw/App/DrawViewDimExtentPy.h>  // generated from DrawViewDimExtentPy.xml
+
+using namespace TechDraw;
+
+//===========================================================================
+// DrawViewDimExtent
+//===========================================================================
+
+PROPERTY_SOURCE(TechDraw::DrawViewDimExtent, TechDraw::DrawViewDimension)
+
+DrawViewDimExtent::DrawViewDimExtent(void)
+{
+    App::PropertyLinkSubList       Source;                       //DrawViewPart & SubElements(Edges)
+                                                                 //Cosmetic End points are stored in DVD::References2d
+    App::PropertyLinkSubList       Source3d;                     //Part::Feature & SubElements  TBI
+
+    ADD_PROPERTY_TYPE(Source,(0,0),"",(App::PropertyType)(App::Prop_Output),"View (Edges) to dimension");
+    Source.setScope(App::LinkScope::Global);
+    ADD_PROPERTY_TYPE(Source3d,(0,0),"",(App::PropertyType)(App::Prop_Output),"View (Edges) to dimension");   //TBI
+    Source3d.setScope(App::LinkScope::Global);
+    ADD_PROPERTY_TYPE(DirExtent ,(0),"",App::Prop_Output,"Horizontal / Vertical");
+
+    //hide the properties the user can't edit in the property editor
+    Source3d.setStatus(App::Property::Hidden,true);   //TBI
+
+}
+
+DrawViewDimExtent::~DrawViewDimExtent()
+{
+}
+
+void DrawViewDimExtent::onChanged(const App::Property* prop)
+{
+    if (!isRestoring()) {
+        if (prop == &Source) {
+//            Base::Console().Message("DVDE::onChanged - Source: %X\n", Source.getValue());
+            //recalculate the points?
+        }
+    }
+    DrawViewDimension::onChanged(prop);
+}
+
+short DrawViewDimExtent::mustExecute() const
+{
+    return DrawViewDimension::mustExecute();
+}
+
+App::DocumentObjectExecReturn *DrawViewDimExtent::execute(void)
+{
+//    Base::Console().Message("DVDE::execute() - %s\n", getNameInDocument());
+    if (!keepUpdated()) {
+        return App::DocumentObject::StdReturn;
+    }
+
+    App::DocumentObject* docObj = Source.getValue();
+    if (docObj == nullptr) {
+        return App::DocumentObject::StdReturn;
+    }
+    DrawViewPart* dvp = dynamic_cast<DrawViewPart*>(docObj);
+     if (dvp == nullptr) {
+        return App::DocumentObject::StdReturn;
+    }
+
+    double tolerance = 0.00001;
+    std::vector<std::string> edgeNames = getSubNames();
+    int direction = DirExtent.getValue();
+
+    std::pair<Base::Vector3d, Base::Vector3d> endPoints = 
+                                        DrawDimHelper::minMax(dvp,
+                                                              edgeNames,
+                                                              direction);
+    Base::Vector3d refMin = endPoints.first;
+    Base::Vector3d refMax = endPoints.second;
+
+    TechDraw::Vertex* v0 = nullptr;
+    TechDraw::Vertex* v1 = nullptr;
+    const std::vector<std::string> &subElements = References2D.getSubValues();
+    if (subElements.size() > 1) {
+        int idx0 = DrawUtil::getIndexFromName(subElements[0]);
+        int idx1 = DrawUtil::getIndexFromName(subElements[1]);
+        v0 = getViewPart()->getProjVertexByIndex(idx0);
+        v1 = getViewPart()->getProjVertexByIndex(idx1);
+
+        double length00 = (v0->pnt - refMin).Length();
+        double length11 = (v1->pnt - refMax).Length();
+        double length01 = (v0->pnt - refMax).Length();
+        double length10 = (v1->pnt - refMin).Length();
+        if (  ((length00 < tolerance) &&
+               (length11 < tolerance))  ||
+              ((length01 < tolerance) &&
+               (length10 < tolerance))  ) {
+        } else {
+            //update GV
+            v0->pnt = refMin;
+            v1->pnt = refMax;
+    //        v0->occVertex = ???
+    //        v1->occVertex = ???
+            //update CV
+            double scale = dvp->getScale();
+            int cv0 = v0->cosmeticLink;
+            CosmeticVertex* cvTemp = dvp->getCosmeticVertexByIndex(cv0);
+            cvTemp->permaPoint = refMin / scale;
+            int cv1 = v1->cosmeticLink;
+            cvTemp = dvp->getCosmeticVertexByIndex(cv1);
+            cvTemp->permaPoint = refMax / scale; 
+        }
+    }
+
+    return DrawViewDimension::execute();
+}
+
+//getSubValues returns a garbage 1st entry if there are no subelements.
+std::vector<std::string> DrawViewDimExtent::getSubNames(void)
+{
+    std::vector<std::string> result;
+    std::vector<std::string> edgeNames = Source.getSubValues();
+    if (!edgeNames.empty() && 
+         (edgeNames[0].size() == 0)) {
+         //garbage first entry - nop
+    } else {
+        result = edgeNames;
+    }
+    return result;
+}
+
+void DrawViewDimExtent::unsetupObject()
+{
+    //CV's need to be deleted, but deleting messes up all the indices to other CV's!
+//    TechDraw::DrawViewPart* dvp = getViewPart();
+//    std::vector<TechDraw::CosmeticVertex*> cVerts = dvp->CosmeticVertexes.getValues();
+//    Base::Console().Message("DVDE::unsetupObject() - cVerts: %d\n", cVerts.size());
+//    TechDraw::Vertex* v0 = nullptr;
+//    TechDraw::Vertex* v1 = nullptr;
+//    const std::vector<std::string> &subElements = References2D.getSubValues();
+//    if (subElements.size() > 1) {
+//        Base::Console().Message("DVDE::unsetupObject - more than 1 subElement\n");
+//        int idx1 = DrawUtil::getIndexFromName(subElements[1]);
+//        v1 = dvp->getProjVertexByIndex(idx1);
+//        if (v1 != nullptr) {
+//            int cv1 = v1->cosmeticLink;
+//            dvp->removeCosmeticVertex(cv1);
+//        }
+
+//        int idx0 = DrawUtil::getIndexFromName(subElements[0]);
+//        v0 = dvp->getProjVertexByIndex(idx0);
+//        if (v0 != nullptr) {
+//            int cv0 = v0->cosmeticLink;
+//            dvp->removeCosmeticVertex(cv0);
+//        }
+//    }
+//    cVerts = dvp->CosmeticVertexes.getValues();
+//    Base::Console().Message("DVDE::unsetupObject - exit - cVerts: %d\n", cVerts.size());
+    DrawViewDimension::unsetupObject();
+//    App::DocumentObject::unsetUpObject();
+}
+
+PyObject *DrawViewDimExtent::getPyObject(void)
+{
+    if (PythonObject.is(Py::_None())) {
+        // ref counter is set to 1
+        PythonObject = Py::Object(new DrawViewDimExtentPy(this),true);
+    }
+    return Py::new_reference_to(PythonObject);
+}
--- a/src/Mod/TechDraw/App/DrawViewDimExtent.h
+++ b/src/Mod/TechDraw/App/DrawViewDimExtent.h
@@ -0,0 +1,65 @@
+/***************************************************************************
+ *   Copyright (c) 2019 Wandererfan <wandererfan@gmail.com>                *
+ *                                                                         *
+ *   This file is part of the FreeCAD CAx development system.              *
+ *                                                                         *
+ *   This library is free software; you can redistribute it and/or         *
+ *   modify it under the terms of the GNU Library General Public           *
+ *   License as published by the Free Software Foundation; either          *
+ *   version 2 of the License, or (at your option) any later version.      *
+ *                                                                         *
+ *   This library  is distributed in the hope that it will be useful,      *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU Library General Public License for more details.                  *
+ *                                                                         *
+ *   You should have received a copy of the GNU Library General Public     *
+ *   License along with this library; see the file COPYING.LIB. If not,    *
+ *   write to the Free Software Foundation, Inc., 59 Temple Place,         *
+ *   Suite 330, Boston, MA  02111-1307, USA                                *
+ *                                                                         *
+ ***************************************************************************/
+
+#ifndef _TechDraw_DrawViewDimExtent_h_
+#define _TechDraw_DrawViewDimExtent_h_
+#include <tuple>
+
+# include <App/DocumentObject.h>
+# include <App/FeaturePython.h>
+# include <App/PropertyLinks.h>
+
+#include "DrawViewDimension.h"
+
+namespace TechDraw {
+
+class TechDrawExport DrawViewDimExtent : public TechDraw::DrawViewDimension
+{
+    PROPERTY_HEADER(TechDraw::DrawViewDimExtent);
+
+public:
+    /// Constructor
+    DrawViewDimExtent();
+    virtual ~DrawViewDimExtent();
+
+    App::PropertyLinkSubList       Source;                       //DrawViewPart & SubElements(Edges)
+                                                                 //Cosmetic End points are stored in DVD::References2d
+    App::PropertyLinkSubList       Source3d;                     //Part::Feature & SubElements  TBI
+    App::PropertyInteger           DirExtent;                    //Horizontal, Vertical, TBD
+
+    virtual App::DocumentObjectExecReturn *execute(void);
+    virtual short mustExecute() const;
+    virtual void unsetupObject();
+
+    //return PyObject as DrawViewDimExtentPy
+    virtual PyObject *getPyObject(void);
+
+
+protected:
+    void onChanged(const App::Property* prop);
+    std::vector<std::string> getSubNames(void);
+
+private:
+};
+
+} //namespace TechDraw
+#endif
--- a/src/Mod/TechDraw/App/DrawViewDimExtentPy.xml
+++ b/src/Mod/TechDraw/App/DrawViewDimExtentPy.xml
@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<GenerateModel xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="generateMetaModel_Module.xsd">
+  <PythonExport
+    Father="DrawViewDimensionPy"
+    Name="DrawViewDimExtentPy"
+    Twin="DrawViewDimExtent"
+    TwinPointer="DrawViewDimExtent"
+    Include="Mod/TechDraw/App/DrawViewDimExtent.h"
+    Namespace="TechDraw"
+    FatherInclude="Mod/TechDraw/App/DrawViewDimensionPy.h"
+    FatherNamespace="TechDraw">
+    <Documentation>
+      <Author Licence="LGPL" Name="WandererFan" EMail="wandererfan@gmail.com" />
+      <UserDocu>Feature for creating and manipulating Technical Drawing DimExtents</UserDocu>
+    </Documentation>
+    <Methode Name="tbd">
+      <Documentation>
+        <UserDocu>tbd() - returns tbd.</UserDocu>
+      </Documentation>
+    </Methode>
+    <CustomAttributes />
+  </PythonExport>
+</GenerateModel>
--- a/src/Mod/TechDraw/App/DrawViewDimExtentPyImp.cpp
+++ b/src/Mod/TechDraw/App/DrawViewDimExtentPyImp.cpp
@@ -0,0 +1,62 @@
+/***************************************************************************
+ *   Copyright (c) WandererFan            (wandererfan@gmail.com) 2019     *
+ *                                                                         *
+ *   This file is part of the FreeCAD CAx development system.              *
+ *                                                                         *
+ *   This library is free software; you can redistribute it and/or         *
+ *   modify it under the terms of the GNU Library General Public           *
+ *   License as published by the Free Software Foundation; either          *
+ *   version 2 of the License, or (at your option) any later version.      *
+ *                                                                         *
+ *   This library  is distributed in the hope that it will be useful,      *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU Library General Public License for more details.                  *
+ *                                                                         *
+ *   You should have received a copy of the GNU Library General Public     *
+ *   License along with this library; see the file COPYING.LIB. If not,    *
+ *   write to the Free Software Foundation, Inc., 59 Temple Place,         *
+ *   Suite 330, Boston, MA  02111-1307, USA                                *
+ *                                                                         *
+ ***************************************************************************/
+
+#include "PreCompiled.h"
+#ifndef _PreComp_
+#endif
+
+#include <Base/Console.h>
+#include <Base/PyObjectBase.h>
+#include <Base/Vector3D.h>
+
+#include "DrawViewDimExtent.h"
+
+// inclusion of the generated files (generated out of DrawViewDimExtentPy.xml)
+#include <Base/VectorPy.h>
+#include <Mod/TechDraw/App/DrawViewDimExtentPy.h>
+#include <Mod/TechDraw/App/DrawViewDimExtentPy.cpp>
+
+using namespace TechDraw;
+
+// returns a string which represents the object e.g. when printed in python
+std::string DrawViewDimExtentPy::representation(void) const
+{
+    return std::string("<DrawViewDimExtent object>");
+}
+PyObject* DrawViewDimExtentPy::tbd(PyObject* args)
+{
+    (void) args;
+    PyObject *pyText = nullptr;
+    return pyText;
+}
+
+
+
+PyObject *DrawViewDimExtentPy::getCustomAttributes(const char* /*attr*/) const
+{
+    return 0;
+}
+
+int DrawViewDimExtentPy::setCustomAttributes(const char* /*attr*/, PyObject* /*obj*/)
+{
+    return 0;
+}
--- a/src/Mod/TechDraw/App/DrawViewPart.cpp
+++ b/src/Mod/TechDraw/App/DrawViewPart.cpp
@@ -68,6 +68,7 @@
 #include <TopoDS_Shape.hxx>
 #include <TopoDS_Vertex.hxx>
 #include <TopoDS_Wire.hxx>
+
 #include <TopTools_IndexedMapOfShape.hxx>

 #endif
@@ -119,7 +120,7 @@ using namespace std;

 PROPERTY_SOURCE(TechDraw::DrawViewPart, TechDraw::DrawView)

-DrawViewPart::DrawViewPart(void) : 
+DrawViewPart::DrawViewPart(void) :
    geometryObject(0)
 {
    static const char *group = "Projection";
@@ -204,6 +205,7 @@ TopoDS_Shape DrawViewPart::getSourceShapeFused(void) const
    return result;
 }

+
 App::DocumentObjectExecReturn *DrawViewPart::execute(void)
 {
 //    Base::Console().Message("DVP::execute() - %s\n", Label.getValue());
@@ -239,10 +241,11 @@ App::DocumentObjectExecReturn *DrawViewPart::execute(void)

    gp_Pnt inputCenter;
    Base::Vector3d stdOrg(0.0,0.0,0.0);
-    
+
    inputCenter = TechDraw::findCentroid(shape,
                                         getViewAxis(stdOrg,Direction.getValue()));
                                                 
+
    shapeCentroid = Base::Vector3d(inputCenter.X(),inputCenter.Y(),inputCenter.Z());
    TopoDS_Shape mirroredShape;
    mirroredShape = TechDraw::mirrorShape(shape,
@@ -646,7 +649,7 @@ std::vector<TopoDS_Wire> DrawViewPart::getWireForFace(int idx) const
        TopoDS_Wire occwire = EdgeWalker::makeCleanWire(edges);
        result.push_back(occwire);
    }
- 
+
    return result;
 }

@@ -722,7 +725,7 @@ gp_Ax2 DrawViewPart::getViewAxis(const Base::Vector3d& pt,
                                 const bool flip)  const
 {
    gp_Ax2 viewAxis = TechDraw::getViewAxis(pt,axis,flip);
-     
+
    return viewAxis;
 }

@@ -799,7 +802,7 @@ bool DrawViewPart::showSectionEdges(void)
 }

 //! remove features that are useless without this DVP
-//! hatches, geomhatches, dimensions,... 
+//! hatches, geomhatches, dimensions,...
 void DrawViewPart::unsetupObject()
 {
    nowUnsetting = true;
@@ -814,7 +817,7 @@ void DrawViewPart::unsetupObject()
        Base::Interpreter().runStringArg("App.getDocument(\"%s\").removeObject(\"%s\")",
                                          docName.c_str(), viewName.c_str());
    }
-    
+
    // Remove the View's GeomHatches from document
    std::vector<TechDraw::DrawGeomHatch*> gHatches = getGeomHatches();
    std::vector<TechDraw::DrawGeomHatch*>::iterator it2 = gHatches.begin();
@@ -872,7 +875,7 @@ bool DrawViewPart::isIso(void) const
 //********
 //* Cosmetics
 //********
-void DrawViewPart::clearCosmeticVertexes(void) 
+void DrawViewPart::clearCosmeticVertexes(void)
 {
    std::vector<CosmeticVertex*> noVerts;
    CosmeticVertexes.setValues(noVerts);
@@ -881,8 +884,8 @@ void DrawViewPart::clearCosmeticVertexes(void)
 //CosmeticVertex x,y are stored as unscaled, but mirrored values.
 //if you are creating a CV based on calculations of scaled geometry, you need to 
 //unscale x,y before creation.
-//if you are creating a CV based on calculations of mirrored geometry, you need to 
-//mirror again before creation. 
+//if you are creating a CV based on calculations of mirrored geometry, you need to
+//mirror again before creation.

 //returns CosmeticVertex index! not geomVertexNumber!
 int DrawViewPart::addCosmeticVertex(Base::Vector3d pos)
@@ -1000,18 +1003,44 @@ TechDraw::CosmeticVertex* DrawViewPart::getCosmeticVertexByGeom(int idx) const
 //add the cosmetic verts to geometry vertex list
 void DrawViewPart::addCosmeticVertexesToGeom(void)
 {
-    int i = 0;
-    const std::vector<TechDraw::CosmeticVertex*> verts = CosmeticVertexes.getValues();
-    int stop = (int) verts.size();
-    for ( ; i < stop; i++) {
-        int idx = geometryObject->addCosmeticVertex((verts.at(i)->point()) * getScale(), i);
-        verts.at(i)->linkGeom = idx;
+//    Base::Console().Message("DVP::addCosmeticVertexesToGeom()\n");
+    int iCV = 0;
+    const std::vector<TechDraw::CosmeticVertex*> cVerts = CosmeticVertexes.getValues();
+    const std::vector<TechDraw::Vertex *> gVerts = getVertexGeometry();
+    int stop = (int) cVerts.size();
+    for ( ; iCV < stop; iCV++) {
+        int iGV = geometryObject->addCosmeticVertex(cVerts.at(iCV)->scaled(getScale()), iCV);
+        cVerts.at(iCV)->linkGeom = iGV;
    }
 }

+int DrawViewPart::add1CVToGV(int iCV)
+{
+//    Base::Console().Message("DVP::add1CVToGV(%d)\n", iCV);
+    TechDraw::CosmeticVertex* cv = getCosmeticVertexByIndex(iCV);
+    int iGV = geometryObject->addCosmeticVertex(cv->scaled(getScale()), iCV);
+    cv->linkGeom = iGV;
+    return iGV;
+}
+
+//given a CosmeticVertex's index, return the corresponding geometry vertex's index
+int DrawViewPart::convertCosmeticVertexIndex(int iCV)
+{
+//    Base::Console().Message("DVP::convertCosmeticVertexIndex(%d)\n",iCV);
+    int result = -1;
+    if (geometryObject != nullptr) {
+        std::vector<TechDraw::CosmeticVertex*> cVerts = CosmeticVertexes.getValues();
+        TechDraw::CosmeticVertex* cv = cVerts.at(iCV);
+        int temp = cv->linkGeom;
+        result = temp;
+        //could double check with tag comparison
+    }
+    return result;
+}
+
 //CosmeticEdges -------------------------------------------------------------------

-void DrawViewPart::clearCosmeticEdges(void) 
+void DrawViewPart::clearCosmeticEdges(void)
 {
    std::vector<CosmeticEdge*> noEdges;
    std::vector<CosmeticEdge*> edges = CosmeticEdges.getValues();
@@ -1152,17 +1181,17 @@ void DrawViewPart::addCosmeticEdgesToGeom(void)
    int stop = (int) edges.size();
    for ( ; i < stop; i++) {
        TechDraw::BaseGeom* scaledGeom = edges.at(i)->scaledGeometry(getScale());
-        if (scaledGeom == nullptr) { 
+        if (scaledGeom == nullptr) {
            Base::Console().Error("DVP::addCosmeticEdgesToGeom - scaledGeometry is null\n");
            continue;
        }
-//        int idx = 
+//        int idx =
        (void) geometryObject->addCosmeticEdge(scaledGeom, 1, i);
    }
 }

 // CenterLines -----------------------------------------------------------------
-void DrawViewPart::clearCenterLines(void) 
+void DrawViewPart::clearCenterLines(void)
 {
    std::vector<CenterLine*> noLines;
    std::vector<CenterLine*> lines = CenterLines.getValues();
@@ -1257,18 +1286,18 @@ void DrawViewPart::addCenterLinesToGeom(void)
    int stop = (int) lines.size();
    for ( ; i < stop; i++) {
        TechDraw::BaseGeom* scaledGeom = lines.at(i)->scaledGeometry(this);
-        if (scaledGeom == nullptr) { 
+        if (scaledGeom == nullptr) {
            Base::Console().Error("DVP::addCenterLinesToGeom - scaledGeometry is null\n");
            continue;
        }
-//        int idx = 
+//        int idx =
        (void) geometryObject->addCenterLine(scaledGeom, 2, i);
    }
 }

 // GeomFormats -----------------------------------------------------------------

-void DrawViewPart::clearGeomFormats(void) 
+void DrawViewPart::clearGeomFormats(void)
 {
    std::vector<GeomFormat*> noFormats;
    std::vector<GeomFormat*> fmts = GeomFormats.getValues();
@@ -1323,6 +1352,22 @@ TechDraw::GeomFormat* DrawViewPart::getGeomFormatByGeom(int idx) const
    return result;
 }

+//------------------------------------------------------------------------------
+
+void DrawViewPart::dumpVerts(std::string text)
+{
+    if (geometryObject == nullptr) {
+        Base::Console().Message("no verts to dump yet\n");
+        return;
+    }
+    std::vector<TechDraw::Vertex *> gVerts = getVertexGeometry();
+    Base::Console().Message("%s - dumping %d vertGeoms\n",
+                            text.c_str(), gVerts.size());
+    for (auto& gv: gVerts) {
+        gv->dump();
+    }
+}
+
 void DrawViewPart::onDocumentRestored()
 {
 //    requestPaint();
--- a/src/Mod/TechDraw/App/DrawViewPart.h
+++ b/src/Mod/TechDraw/App/DrawViewPart.h
@@ -179,6 +179,10 @@ public:
    TechDraw::CosmeticVertex* getCosmeticVertexByGeom(int idx) const;
    void clearCosmeticVertexes(void); 
    void addCosmeticVertexesToGeom(void);
+    void add1CosmeticVertexToGeom(int iCV);
+    int convertCosmeticVertexIndex(int idx);
+    int add1CVToGV(int iCV);
+

    virtual int addCosmeticEdge(Base::Vector3d start, Base::Vector3d end);
    virtual int addCosmeticEdge(TopoDS_Edge e);
@@ -209,6 +213,8 @@ public:
    TechDraw::GeomFormat* getGeomFormatByGeom(int idx) const;
    void clearGeomFormats(void);

+    void dumpVerts(std::string text);
+
 protected:
    TechDraw::GeometryObject *geometryObject;
    Base::BoundBox3d bbox;
--- a/src/Mod/TechDraw/App/Geometry.cpp
+++ b/src/Mod/TechDraw/App/Geometry.cpp
@@ -353,6 +353,7 @@ std::string BaseGeom::dump()
    std::stringstream ss;
    ss << "BaseGeom: s:(" << start.x << "," << start.y << ") e:(" << end.x << "," << end.y << ") ";
    ss << "type: " << geomType << " class: " << classOfEdge << " viz: " << visible << " rev: " << reversed;
+    ss << "cosmetic: " << cosmetic << " source: " << source() << " iSource: " << sourceIndex();
    return ss.str();
 }

@@ -1336,6 +1337,13 @@ Vertex::Vertex(double x, double y)
    cosmeticLink = -1;
 }

+Vertex::Vertex(Base::Vector3d v) : Vertex(v.x,v.y)
+{
+//    Base::Console().Message("V::V(%s)\n",
+//                            DrawUtil::formatVector(v).c_str());
+}
+
+
 bool Vertex::isEqual(Vertex* v, double tol)
 {
    bool result = false;
@@ -1389,6 +1397,12 @@ void Vertex::Restore(Base::XMLReader &reader)
    occVertex = mkVert.Vertex();
 }

+void Vertex::dump()
+{
+    Base::Console().Message("TD::Vertex point: %s vis: %d cosmetic: %d  cosLink: %d\n",
+                            DrawUtil::formatVector(pnt).c_str(), visible, cosmetic, cosmeticLink);
+}
+

 /*static*/
 BaseGeomPtrVector GeometryUtils::chainGeoms(BaseGeomPtrVector geoms)
--- a/src/Mod/TechDraw/App/Geometry.h
+++ b/src/Mod/TechDraw/App/Geometry.h
@@ -23,6 +23,8 @@
 #ifndef TECHDRAW_GEOMETRY_H
 #define TECHDRAW_GEOMETRY_H

+#include <boost/uuid/uuid.hpp>
+
 #include <Base/Tools2D.h>
 #include <Base/Vector3D.h>
 #include <Base/Reader.h>
@@ -281,11 +283,13 @@ class TechDrawExport Vertex
        Vertex();
        Vertex(const Vertex* v);
        Vertex(double x, double y);
-        Vertex(Base::Vector3d v) : Vertex(v.x,v.y) {}
+        Vertex(Base::Vector3d v);
        virtual ~Vertex() {}

        virtual void Save(Base::Writer &/*writer*/) const;
        virtual void Restore(Base::XMLReader &/*reader*/);
+        virtual std::string getTagAsString() const { return std::string(); }
+        virtual void dump();

        Base::Vector3d pnt;
        ExtractionType extractType;       //obs?
@@ -298,6 +302,8 @@ class TechDrawExport Vertex
        void point(Base::Vector3d v){ pnt = Base::Vector3d(v.x, v.y); }
        bool cosmetic;
        int cosmeticLink;
+        boost::uuids::uuid cosmeticTag;
+

        double x() {return pnt.x;}
        double y() {return pnt.y;}
--- a/src/Mod/TechDraw/App/GeometryObject.cpp
+++ b/src/Mod/TechDraw/App/GeometryObject.cpp
@@ -474,11 +474,13 @@ void GeometryObject::addGeomFromCompound(TopoDS_Shape edgeCompound, edgeClass ca
    }  //end TopExp
 }

+//adds a new GeomVert to list for cv[link]
 int GeometryObject::addCosmeticVertex(Base::Vector3d pos, int link)
 {
    TechDraw::Vertex* v = new TechDraw::Vertex(pos.x, pos.y);
    v->cosmetic = true;
    v->cosmeticLink = link;
+    v->visible = true;
    int idx = vertexGeom.size();
    vertexGeom.push_back(v);
    return idx;
@@ -573,6 +575,7 @@ bool GeometryObject::isWithinArc(double theta, double first,
    }
 }

+//note bbx is scaled
 Base::BoundBox3d GeometryObject::calcBoundingBox() const
 {
 //    Base::Console().Message("GO::calcBoundingBox() - edges: %d\n", edgeGeom.size());
--- a/src/Mod/TechDraw/Gui/CommandCreateDims.cpp
+++ b/src/Mod/TechDraw/Gui/CommandCreateDims.cpp
@@ -53,6 +53,7 @@
 # include <Mod/TechDraw/App/DrawProjGroupItem.h>
 # include <Mod/TechDraw/App/DrawProjGroup.h>
 # include <Mod/TechDraw/App/DrawViewDimension.h>
+# include <Mod/TechDraw/App/DrawDimHelper.h>
 # include <Mod/TechDraw/App/DrawPage.h>
 # include <Mod/TechDraw/App/DrawUtil.h>
 # include <Mod/TechDraw/App/Geometry.h>
@@ -66,6 +67,7 @@
 #include "TaskLinkDim.h"

 using namespace TechDrawGui;
+using namespace TechDraw;
 using namespace std;


@@ -99,6 +101,9 @@ bool _isValidVertexToEdge(Gui::Command* cmd);
 char* _edgeTypeToText(int e);
 //bool _checkActive(Gui::Command* cmd, Base::Type classType, bool needSubs);

+void execHExtent(Gui::Command* cmd);
+void execVExtent(Gui::Command* cmd);
+

 //NOTE: this is not shown in toolbar and doesn't always work right in the menu.
 //      should be removed.
@@ -1070,6 +1075,270 @@ bool CmdTechDrawLinkDimension::isActive(void)
    return (havePage && haveView && !taskInProgress);
 }

+//===========================================================================
+// ExtentGroup
+//===========================================================================
+
+DEF_STD_CMD_ACL(CmdTechDrawExtentGrp)
+
+CmdTechDrawExtentGrp::CmdTechDrawExtentGrp()
+  : Command("TechDraw_ExtentGrp")
+{
+    sAppModule      = "TechDraw";
+    sGroup          = QT_TR_NOOP("TechDraw");
+    sMenuText       = QT_TR_NOOP("Insert Extent Dimension");
+    sToolTipText    = QT_TR_NOOP("Insert Extent Dimension");
+    sWhatsThis      = "TechDraw_ExtentGrp";
+    sStatusTip      = sToolTipText;
+//    eType           = ForEdit;
+}
+
+void CmdTechDrawExtentGrp::activated(int iMsg)
+{
+//    Base::Console().Message("CMD::ExtentGrp - activated(%d)\n", iMsg);
+    Gui::TaskView::TaskDialog *dlg = Gui::Control().activeDialog();
+    if (dlg != nullptr) {
+        QMessageBox::warning(Gui::getMainWindow(), QObject::tr("Task In Progress"),
+            QObject::tr("Close active task dialog and try again."));
+        return;
+    }
+
+    Gui::ActionGroup* pcAction = qobject_cast<Gui::ActionGroup*>(_pcAction);
+    pcAction->setIcon(pcAction->actions().at(iMsg)->icon());
+    switch(iMsg) {
+        case 0:
+            execHExtent(this);
+            break;
+        case 1:
+            execVExtent(this);
+            break;
+        default:
+            Base::Console().Message("CMD::ExtGrp - invalid iMsg: %d\n",iMsg);
+    };
+}
+
+Gui::Action * CmdTechDrawExtentGrp::createAction(void)
+{
+    Gui::ActionGroup* pcAction = new Gui::ActionGroup(this, Gui::getMainWindow());
+    pcAction->setDropDownMenu(true);
+    applyCommandData(this->className(), pcAction);
+
+    QAction* p1 = pcAction->addAction(QString());
+    p1->setIcon(Gui::BitmapFactory().iconFromTheme("TechDraw_Dimension_HExtent"));
+    p1->setObjectName(QString::fromLatin1("TechDraw_HorizontalExtent"));
+    p1->setWhatsThis(QString::fromLatin1("TechDraw_HorizontalExtent"));
+    QAction* p2 = pcAction->addAction(QString());
+    p2->setIcon(Gui::BitmapFactory().iconFromTheme("TechDraw_Dimension_VExtent"));
+    p2->setObjectName(QString::fromLatin1("TechDraw_VerticalExtent"));
+    p2->setWhatsThis(QString::fromLatin1("TechDraw_VerticalExtent"));
+
+    _pcAction = pcAction;
+    languageChange();
+
+    pcAction->setIcon(p1->icon());
+    int defaultId = 0;
+    pcAction->setProperty("defaultAction", QVariant(defaultId));
+
+    return pcAction;
+}
+
+void CmdTechDrawExtentGrp::languageChange()
+{
+    Command::languageChange();
+
+    if (!_pcAction)
+        return;
+    Gui::ActionGroup* pcAction = qobject_cast<Gui::ActionGroup*>(_pcAction);
+    QList<QAction*> a = pcAction->actions();
+
+    QAction* arc1 = a[0];
+    arc1->setText(QApplication::translate("CmdTechDrawExtentGrp","Horizontal Extent"));
+    arc1->setToolTip(QApplication::translate("TechDraw_HorizontalExtent","Insert a Horizontal Extent dimension"));
+    arc1->setStatusTip(arc1->toolTip());
+    QAction* arc2 = a[1];
+    arc2->setText(QApplication::translate("CmdTechDrawExtentGrp","Vertical Extent"));
+    arc2->setToolTip(QApplication::translate("TechDraw_VerticalExtent","Insert a Vertical Extent dimension"));
+    arc2->setStatusTip(arc2->toolTip());
+}
+
+bool CmdTechDrawExtentGrp::isActive(void)
+{
+    bool havePage = DrawGuiUtil::needPage(this);
+    bool haveView = DrawGuiUtil::needView(this, false);
+    return (havePage && haveView);
+}
+
+//===========================================================================
+// TechDraw_HorizontalExtent
+//===========================================================================
+
+DEF_STD_CMD_A(CmdTechDrawHorizontalExtent)
+
+CmdTechDrawHorizontalExtent::CmdTechDrawHorizontalExtent()
+  : Command("TechDraw_HorizontalExtent")
+{
+    sAppModule      = "TechDraw";
+    sGroup          = QT_TR_NOOP("TechDraw");
+    sMenuText       = QT_TR_NOOP("Add a Horizontal Extent dimension");
+    sToolTipText    = QT_TR_NOOP("Add a Horizontal Extent dimension");
+    sWhatsThis      = "TechDraw_HorizontalExtent";
+    sStatusTip      = sToolTipText;
+    sPixmap         = "TechDraw_Dimension_HExtent";
+}
+
+void CmdTechDrawHorizontalExtent::activated(int iMsg)
+{
+    Q_UNUSED(iMsg);
+
+    Gui::TaskView::TaskDialog *dlg = Gui::Control().activeDialog();
+    if (dlg != nullptr) {
+        QMessageBox::warning(Gui::getMainWindow(), QObject::tr("Task In Progress"),
+            QObject::tr("Close active task dialog and try again."));
+        return;
+    }
+
+    execHExtent(this);
+}
+
+bool CmdTechDrawHorizontalExtent::isActive(void)
+{
+    bool havePage = DrawGuiUtil::needPage(this);
+    bool haveView = DrawGuiUtil::needView(this, false);
+    return (havePage && haveView);
+}
+
+void execHExtent(Gui::Command* cmd)
+{
+    TechDraw::DrawPage* page = DrawGuiUtil::findPage(cmd);
+    if (!page) {
+        return;
+    }
+
+    std::vector<Gui::SelectionObject> selection = cmd->getSelection().getSelectionEx();
+    TechDraw::DrawViewPart* baseFeat = nullptr;
+    if (!selection.empty()) {
+        baseFeat =  dynamic_cast<TechDraw::DrawViewPart *>(selection[0].getObject());
+        if( baseFeat == nullptr ) {
+            QMessageBox::warning(Gui::getMainWindow(), QObject::tr("Selection Error"),
+                                 QObject::tr("No base View in Selection."));
+            return;
+        }
+    } else {
+            QMessageBox::warning(Gui::getMainWindow(), QObject::tr("Selection Error"),
+                                 QObject::tr("Please select a View [and Edges]."));
+            return;
+    }
+
+    std::vector<std::string> SubNames;
+
+    std::vector<Gui::SelectionObject>::iterator itSel = selection.begin();
+    for (; itSel != selection.end(); itSel++)  {
+        if ((*itSel).getObject()->isDerivedFrom(TechDraw::DrawViewPart::getClassTypeId())) {
+ //           baseFeat = static_cast<TechDraw::DrawViewPart*> ((*itSel).getObject());
+            SubNames = (*itSel).getSubNames();
+            if (SubNames.empty() || SubNames[0].empty()) {
+                SubNames.clear();
+            }
+        }
+    }
+
+    std::vector<std::string> edgeNames;
+    for (auto& s: SubNames) {
+        std::string geomType = DrawUtil::getGeomTypeFromName(s);
+        if (geomType == "Edge") {
+            edgeNames.push_back(s);
+        }
+    }
+
+    DrawDimHelper::makeExtentDim(baseFeat,
+                                 edgeNames,
+                                 0);
+}
+
+//===========================================================================
+// TechDraw_VerticalExtent
+//===========================================================================
+
+DEF_STD_CMD_A(CmdTechDrawVerticalExtent)
+
+CmdTechDrawVerticalExtent::CmdTechDrawVerticalExtent()
+  : Command("TechDraw_VerticalExtent")
+{
+    sAppModule      = "TechDraw";
+    sGroup          = QT_TR_NOOP("TechDraw");
+    sMenuText       = QT_TR_NOOP("Add a Vertical Extent dimension");
+    sToolTipText    = QT_TR_NOOP("Add a Vertical Extent dimension");
+    sWhatsThis      = "TechDraw_VerticalExtent";
+    sStatusTip      = sToolTipText;
+    sPixmap         = "TechDraw_Dimension_VExtent";
+}
+
+void CmdTechDrawVerticalExtent::activated(int iMsg)
+{
+    Q_UNUSED(iMsg);
+
+    Gui::TaskView::TaskDialog *dlg = Gui::Control().activeDialog();
+    if (dlg != nullptr) {
+        QMessageBox::warning(Gui::getMainWindow(), QObject::tr("Task In Progress"),
+            QObject::tr("Close active task dialog and try again."));
+        return;
+    }
+
+    execVExtent(this);
+}
+
+bool CmdTechDrawVerticalExtent::isActive(void)
+{
+    bool havePage = DrawGuiUtil::needPage(this);
+    bool haveView = DrawGuiUtil::needView(this, false);
+    return (havePage && haveView);
+}
+
+void execVExtent(Gui::Command* cmd)
+{
+    TechDraw::DrawPage* page = DrawGuiUtil::findPage(cmd);
+    if (!page) {
+        return;
+    }
+
+    std::vector<Gui::SelectionObject> selection = cmd->getSelection().getSelectionEx();
+    TechDraw::DrawViewPart* baseFeat = nullptr;
+    if (!selection.empty()) {
+        baseFeat =  dynamic_cast<TechDraw::DrawViewPart *>(selection[0].getObject());
+        if( baseFeat == nullptr ) {
+            QMessageBox::warning(Gui::getMainWindow(), QObject::tr("Selection Error"),
+                                 QObject::tr("No base View in Selection."));
+            return;
+        }
+    } else {
+            QMessageBox::warning(Gui::getMainWindow(), QObject::tr("Selection Error"),
+                                 QObject::tr("Please select a View [and Edges]."));
+            return;
+    }
+
+    std::vector<std::string> SubNames;
+
+    std::vector<Gui::SelectionObject>::iterator itSel = selection.begin();
+    for (; itSel != selection.end(); itSel++)  {
+        if ((*itSel).getObject()->isDerivedFrom(TechDraw::DrawViewPart::getClassTypeId())) {
+            baseFeat = static_cast<TechDraw::DrawViewPart*> ((*itSel).getObject());
+            SubNames = (*itSel).getSubNames();
+        }
+    }
+    std::vector<std::string> edgeNames;
+    for (auto& s: SubNames) {
+        std::string geomType = DrawUtil::getGeomTypeFromName(s);
+        if (geomType == "Edge") {
+            edgeNames.push_back(s);
+        }
+    }
+
+    DrawDimHelper::makeExtentDim(baseFeat,
+                                 edgeNames,
+                                 1);
+}
+
+//------------------------------------------------------------------------------
 void CreateTechDrawCommandsDims(void)
 {
    Gui::CommandManager &rcCmdMgr = Gui::Application::Instance->commandManager();
@@ -1082,6 +1351,9 @@ void CreateTechDrawCommandsDims(void)
    rcCmdMgr.addCommand(new CmdTechDrawNewDistanceYDimension());
    rcCmdMgr.addCommand(new CmdTechDrawNewAngleDimension());
    rcCmdMgr.addCommand(new CmdTechDrawNewAngle3PtDimension());
+    rcCmdMgr.addCommand(new CmdTechDrawExtentGrp());
+    rcCmdMgr.addCommand(new CmdTechDrawVerticalExtent());
+    rcCmdMgr.addCommand(new CmdTechDrawHorizontalExtent());
    rcCmdMgr.addCommand(new CmdTechDrawLinkDimension());
 }

--- a/src/Mod/TechDraw/Gui/Resources/TechDraw.qrc
+++ b/src/Mod/TechDraw/Gui/Resources/TechDraw.qrc
@@ -33,6 +33,8 @@
        <file>icons/TechDraw_Balloon.svg</file>
        <file>icons/TechDraw_Dimension_Vertical.svg</file>
        <file>icons/TechDraw_Dimension_Link.svg</file>
+        <file>icons/TechDraw_Dimension_HExtent.svg</file>
+        <file>icons/TechDraw_Dimension_VExtent.svg</file>
        <file>icons/preferences-techdraw.svg</file>
        <file>icons/arrowdot.svg</file>
        <file>icons/arrowopendot.svg</file>
--- a/src/Mod/TechDraw/Gui/Resources/icons/TechDraw_Dimension_HExtent.svg
+++ b/src/Mod/TechDraw/Gui/Resources/icons/TechDraw_Dimension_HExtent.svg
@@ -0,0 +1,909 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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+
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+   xmlns:dc="http://purl.org/dc/elements/1.1/"
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+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:xlink="http://www.w3.org/1999/xlink"
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--- a/src/Mod/TechDraw/Gui/Workbench.cpp
+++ b/src/Mod/TechDraw/Gui/Workbench.cpp
@@ -76,7 +76,8 @@ Gui::MenuItem* Workbench::setupMenuBar() const
    *draw << "TechDraw_NewRadiusDimension";
    *draw << "TechDraw_NewDiameterDimension";
    *draw << "TechDraw_NewAngleDimension";
-    *draw << "TechDraw_NewAngle3PtDimension";
+    *draw << "TechDraw_HorizontalExtent";
+    *draw << "TechDraw_VerticalExtent";
    *draw << "TechDraw_LinkDimension";
    *draw << "TechDraw_NewBalloon";
    *draw << "Separator";
@@ -141,6 +142,9 @@ Gui::ToolBarItem* Workbench::setupToolBars() const
    *dims << "TechDraw_NewDiameterDimension";
    *dims << "TechDraw_NewAngleDimension";
    *dims << "TechDraw_NewAngle3PtDimension";
+    *dims << "TechDraw_ExtentGrp";
+//    *dims << "TechDraw_HorizontalExtent";
+//    *dims << "TechDraw_VerticalExtent";
    *dims << "TechDraw_LinkDimension";
    *dims << "TechDraw_NewBalloon";
 //    *dims << "TechDraw_NewDimension"
@@ -210,6 +214,9 @@ Gui::ToolBarItem* Workbench::setupCommandBars() const
    *dims << "TechDraw_NewDiameterDimension";
    *dims << "TechDraw_NewAngleDimension";
    *dims << "TechDraw_NewAngle3PtDimension";
+    *dims << "TechDraw_ExtentGrp";
+//    *dims << "TechDraw_HorizontalExtent";
+//    *dims << "TechDraw_VerticalExtent";
    *dims << "TechDraw_LinkDimension";
    *dims << "TechDraw_NewBalloon";
 //    *dims << "TechDraw_NewDimension";