+ Method to convert any curve into B-Spline

src/Mod/Part/App/GeometryCurvePy.xml

@@ -58,6 +58,14 @@ length([uMin,uMax,Tol]) -> Float</UserDocu>
 of the nearest orthogonal projection of the point.</UserDocu>
 			</Documentation>
 		</Methode>
+		<Methode Name="toBSpline">
+			<Documentation>
+				<UserDocu>
+					Converts a curve of any type (only part from First to Last)
+					toBSpline([Float=First, Float=Last]) -> B-Spline curve
+				</UserDocu>
+			</Documentation>
+		</Methode>
 		<Attribute Name="FirstParameter" ReadOnly="true">
 			<Documentation>
 				<UserDocu>

src/Mod/Part/App/GeometryCurvePyImp.cpp

@@ -43,6 +43,7 @@
 # include <Precision.hxx>
 # include <GeomAPI_ProjectPointOnCurve.hxx>
 # include <Standard_Failure.hxx>
+# include <ShapeConstruct_Curve.hxx>
 #endif
 
 #include <Base/GeometryPyCXX.h>
@@ -54,6 +55,7 @@
 #include "RectangularTrimmedSurfacePy.h"
 #include "BSplineSurfacePy.h"
 #include "PlanePy.h"
+#include "BSplineCurvePy.h"
 
 #include "TopoShape.h"
 #include "TopoShapePy.h"
@@ -339,6 +341,32 @@ PyObject* GeometryCurvePy::intersect2d(PyObject *args)
     }
 }
 
+PyObject* GeometryCurvePy::toBSpline(PyObject * args)
+{
+    Handle_Geom_Geometry g = getGeometryPtr()->handle();
+    Handle_Geom_Curve c = Handle_Geom_Curve::DownCast(g);
+    try {
+        if (!c.IsNull()) {
+            double u,v;
+            u=c->FirstParameter();
+            v=c->LastParameter();
+            if (!PyArg_ParseTuple(args, "|dd", &u,&v))
+                return 0;
+            ShapeConstruct_Curve scc;
+            Handle_Geom_BSplineCurve spline = scc.ConvertToBSpline(c, u, v, Precision::Confusion());
+            return new BSplineCurvePy(new GeomBSplineCurve(spline));
+        }
+    }
+    catch (Standard_Failure) {
+        Handle_Standard_Failure e = Standard_Failure::Caught();
+        PyErr_SetString(PyExc_Exception, e->GetMessageString());
+        return 0;
+    }
+
+    PyErr_SetString(PyExc_Exception, "Geometry is not a curve");
+    return 0;
+}
+
 Py::Float GeometryCurvePy::getFirstParameter(void) const
 {
     return Py::Float(Handle_Geom_Curve::DownCast