Implement GeometryCurvePy::length

src/Mod/Part/App/GeometryCurvePy.xml

@@ -26,6 +26,12 @@
 				<UserDocu>Discretizes the curve using a given deflection or number of points and returns a list of points</UserDocu>
 			</Documentation>
 		</Methode>
+		<Methode Name="length">
+			<Documentation>
+				<UserDocu>Computes the length of a curve
+length([uMin,uMax,Tol]) -> Float</UserDocu>
+			</Documentation>
+		</Methode>
 		<Methode Name="value">
 			<Documentation>
 				<UserDocu>Computes the point of parameter u on this curve</UserDocu>

src/Mod/Part/App/GeometryCurvePyImp.cpp

@@ -28,6 +28,7 @@
 # include <gp_Vec.hxx>
 # include <gp_Pln.hxx>
 # include <GCPnts_UniformAbscissa.hxx>
+# include <GCPnts_AbscissaPoint.hxx>
 # include <Geom2dAPI_InterCurveCurve.hxx>
 # include <GeomAPI.hxx>
 # include <Geom_Geometry.hxx>
@@ -156,6 +157,31 @@ PyObject* GeometryCurvePy::discretize(PyObject *args)
     return 0;
 }
 
+PyObject* GeometryCurvePy::length(PyObject *args)
+{
+    Handle_Geom_Geometry g = getGeometryPtr()->handle();
+    Handle_Geom_Curve c = Handle_Geom_Curve::DownCast(g);
+    try {
+        if (!c.IsNull()) {
+            double u=c->FirstParameter();
+            double v=c->LastParameter();
+            double t=Precision::Confusion();
+            if (!PyArg_ParseTuple(args, "|ddd", &u,&v,&t))
+                return 0;
+            double len = GCPnts_AbscissaPoint::Length(GeomAdaptor_Curve(c),u,v,t);
+            return PyFloat_FromDouble(len);
+        }
+    }
+    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;
+}
+
 PyObject* GeometryCurvePy::value(PyObject *args)
 {
     Handle_Geom_Geometry g = getGeometryPtr()->handle();