From 1fc5dea14c7977060a1f4c73b688fa8197e4894b Mon Sep 17 00:00:00 2001
From: Pieter Hijma <pieterhijma@users.noreply.github.com>
Date: Tue, 19 Sep 2023 08:18:45 +0200
Subject: [PATCH] TechDraw: Expose two functions for SVG export

---
 src/Mod/TechDraw/App/AppTechDrawPy.cpp   | 36 ++++++++++++++++++++++++
 src/Mod/TechDraw/App/ProjectionAlgos.cpp | 22 ++++++++-------
 src/Mod/TechDraw/App/ProjectionAlgos.h   |  2 ++
 3 files changed, 50 insertions(+), 10 deletions(-)

diff --git a/src/Mod/TechDraw/App/AppTechDrawPy.cpp b/src/Mod/TechDraw/App/AppTechDrawPy.cpp
index 9fb36bb843..f24f71a5d3 100644
--- a/src/Mod/TechDraw/App/AppTechDrawPy.cpp
+++ b/src/Mod/TechDraw/App/AppTechDrawPy.cpp
@@ -180,6 +180,13 @@ public:
             "string = removeSvgTags(string) -- Removes the opening and closing svg tags\n"
             "and other metatags from a svg code, making it embeddable"
         );
+        add_varargs_method("exportSVGEdges", &Module::exportSVGEdges,
+            "string = exportSVGEdges(TopoShape) -- export an SVG string of the shape\n"
+        );
+        add_varargs_method("build3dCurves", &Module::build3dCurves,
+            "TopoShape = build3dCurves(TopoShape) -- convert the edges to a 3D curve\n"
+	    "which is useful for shapes obtained Part.HLRBRep.Algo"
+        );
         initialize("This is a module for making drawings"); // register with Python
     }
     ~Module() override {}
@@ -1224,6 +1231,35 @@ private:
         return result;
     }
 
+    Py::Object exportSVGEdges(const Py::Tuple& args)
+    {
+        PyObject *pcObjShape(nullptr);
+
+        if (!PyArg_ParseTuple(args.ptr(), "O!",
+			      &(TopoShapePy::Type), &pcObjShape))
+            throw Py::Exception();
+
+        TopoShapePy* pShape = static_cast<TopoShapePy*>(pcObjShape);
+	SVGOutput output;
+	Py::String result(output.exportEdges(pShape->getTopoShapePtr()->getShape()));
+
+	return result;
+    }
+
+    Py::Object build3dCurves(const Py::Tuple& args)
+    {
+        PyObject *pcObjShape(nullptr);
+
+        if (!PyArg_ParseTuple(args.ptr(), "O!",
+			      &(TopoShapePy::Type), &pcObjShape))
+            throw Py::Exception();
+
+        TopoShapePy* pShape = static_cast<TopoShapePy*>(pcObjShape);
+	const TopoShape& nShape =
+	    TechDraw::build3dCurves(pShape->getTopoShapePtr()->getShape());
+	
+	return Py::Object(new TopoShapePy(new TopoShape(nShape)));
+    }
  };
 
  PyObject* initModule()
diff --git a/src/Mod/TechDraw/App/ProjectionAlgos.cpp b/src/Mod/TechDraw/App/ProjectionAlgos.cpp
index 2a6842dc86..cd88254d11 100644
--- a/src/Mod/TechDraw/App/ProjectionAlgos.cpp
+++ b/src/Mod/TechDraw/App/ProjectionAlgos.cpp
@@ -50,6 +50,18 @@ using namespace std;
 // ProjectionAlgos
 //===========================================================================
 
+namespace TechDraw {
+  //added by tanderson. aka blobfish.
+  //projection algorithms build a 2d curve(pcurve) but no 3d curve.
+  //this causes problems with meshing algorithms after save and load.
+  const TopoDS_Shape& build3dCurves(const TopoDS_Shape &shape)
+  {
+    TopExp_Explorer it;
+    for (it.Init(shape, TopAbs_EDGE); it.More(); it.Next())
+      BRepLib::BuildCurve3d(TopoDS::Edge(it.Current()));
+    return shape;
+  }
+}
 
 ProjectionAlgos::ProjectionAlgos(const TopoDS_Shape &Input, const Base::Vector3d &Dir)
   : Input(Input), Direction(Dir)
@@ -61,16 +73,6 @@ ProjectionAlgos::~ProjectionAlgos()
 {
 }
 
-//added by tanderson. aka blobfish.
-//projection algorithms build a 2d curve(pcurve) but no 3d curve.
-//this causes problems with meshing algorithms after save and load.
-static const TopoDS_Shape& build3dCurves(const TopoDS_Shape &shape)
-{
-  TopExp_Explorer it;
-  for (it.Init(shape, TopAbs_EDGE); it.More(); it.Next())
-    BRepLib::BuildCurve3d(TopoDS::Edge(it.Current()));
-  return shape;
-}
 
 void ProjectionAlgos::execute()
 {
diff --git a/src/Mod/TechDraw/App/ProjectionAlgos.h b/src/Mod/TechDraw/App/ProjectionAlgos.h
index f4e8199fe1..771661e0c8 100644
--- a/src/Mod/TechDraw/App/ProjectionAlgos.h
+++ b/src/Mod/TechDraw/App/ProjectionAlgos.h
@@ -38,6 +38,8 @@ class BRepAdaptor_Curve;
 namespace TechDraw
 {
 
+  const TopoDS_Shape& build3dCurves(const TopoDS_Shape& shape);
+  
 /** Algo class for projecting shapes and creating SVG output of it
  */
 class TechDrawExport ProjectionAlgos