Part.EdgePy : get access to stored Pcurves

src/Mod/Part/App/TopoShapeEdgePy.xml

@@ -528,6 +528,15 @@ coordinate system.</UserDocu>
         </Documentation>
         <Parameter Name="Continuity" Type="String"/>
     </Attribute>
+		<Methode Name="curveOnSurface" Const="true">
+			<Documentation>
+				<UserDocu>curveOnSurface(idx) -> None or tuple
+Returns the 2D curve, the surface and the parameter range of index idx.
+Returns None if index idx is out of range.
+Returns a 4-items tuple of a curve, a surface, first parameter and last parameter.
+				</UserDocu>
+			</Documentation>
+		</Methode>
         <ClassDeclarations>
 		</ClassDeclarations>
 	</PythonExport>

src/Mod/Part/App/TopoShapeEdgePyImp.cpp

@@ -44,6 +44,9 @@
 # include <Geom_BezierCurve.hxx>
 # include <Geom_BSplineCurve.hxx>
 # include <Geom_OffsetCurve.hxx>
+# include <Geom_Surface.hxx>
+# include <Geom2d_Curve.hxx>
+# include <TopLoc_Location.hxx>
 # include <gp_Circ.hxx>
 # include <gp_Elips.hxx>
 # include <gp_Hypr.hxx>
@@ -86,6 +89,7 @@
 #include <Mod/Part/App/TopoShapeEdgePy.h>
 #include <Mod/Part/App/TopoShapeEdgePy.cpp>
 
+#include "Geometry2d.h"
 #include "Geometry.h"
 #include <Mod/Part/App/GeometryPy.h>
 #include <Mod/Part/App/LinePy.h>
@@ -1045,6 +1049,42 @@ Py::Boolean TopoShapeEdgePy::getDegenerated(void) const
     return Py::Boolean(ok ? true : false);
 }
 
+PyObject* TopoShapeEdgePy::curveOnSurface(PyObject *args)
+{
+    int idx;
+    if (!PyArg_ParseTuple(args, "i", &idx))
+        return 0;
+
+    try {
+        TopoDS_Edge edge = TopoDS::Edge(getTopoShapePtr()->getShape());
+        Handle(Geom2d_Curve) curve;
+        Handle(Geom_Surface) surf;
+        TopLoc_Location loc;
+        Standard_Real first, last;
+        
+        BRep_Tool::CurveOnSurface(edge, curve, surf, loc, first, last, idx+1);
+        if (curve.IsNull())
+            Py_Return;
+        std::unique_ptr<Part::Geom2dCurve> geo2d = getCurve2dFromGeom2d(curve);
+        if (!geo2d)
+            Py_Return;
+        Part::GeomSurface* geosurf = makeFromSurface(surf);
+        if (!geosurf)
+            Py_Return;
+
+        Py::Tuple tuple(4);
+        tuple.setItem(0, Py::asObject(geo2d->getPyObject()));
+        tuple.setItem(1, Py::asObject(geosurf->getPyObject()));
+        tuple.setItem(2, Py::Float(first));
+        tuple.setItem(3, Py::Float(last));
+        return Py::new_reference_to(tuple);
+    }
+    catch (Standard_Failure& e) {
+        PyErr_SetString(PartExceptionOCCError, e.GetMessageString());
+        return 0;
+    }
+}
+
 PyObject *TopoShapeEdgePy::getCustomAttributes(const char* /*attr*/) const
 {
     return 0;