FEM: input writer, constraint force, move the refshape type code into fem tools

src/Mod/Fem/FemInputWriter.py

@@ -118,16 +118,6 @@ class FemInputWriter():
         # check shape type of reference shape
         for femobj in self.force_objects:  # femobj --> dict, FreeCAD document object is femobj['Object']
             frc_obj = femobj['Object']
-            # in GUI defined frc_obj all ref_shape have the same shape type
-            # TODO in FemTools: check if all RefShapes really have the same type an write type to dictionary
-            femobj['RefShapeType'] = ''
-            if frc_obj.References:
-                first_ref_obj = frc_obj.References[0]
-                first_ref_shape = first_ref_obj[0].Shape.getElement(first_ref_obj[1][0])
-                femobj['RefShapeType'] = first_ref_shape.ShapeType
-            else:
-                # frc_obj.References could be empty ! # TODO in FemTools: check
-                FreeCAD.Console.PrintError('At least one Force Object has empty References!\n')
             if femobj['RefShapeType'] == 'Vertex':
                 # print("load on vertices --> we do not need the femelement_table and femnodes_mesh for node load calculation")
                 pass

src/Mod/Fem/FemTools.py

@@ -269,6 +269,7 @@ class FemTools(QtCore.QRunnable, QtCore.QObject):
             elif m.isDerivedFrom("Fem::ConstraintForce"):
                 force_constraint_dict = {}
                 force_constraint_dict['Object'] = m
+                force_constraint_dict['RefShapeType'] = get_refshape_type(m)
                 self.force_constraints.append(force_constraint_dict)
             elif m.isDerivedFrom("Fem::ConstraintPressure"):
                 PressureObjectDict = {}
@@ -577,4 +578,25 @@ class FemTools(QtCore.QRunnable, QtCore.QObject):
                 stats = match[result_type]
         return stats
 
+
+# helper
+def get_refshape_type(fem_doc_object):
+    # returns the reference shape type
+    # for force object:
+    # in GUI defined frc_obj all frc_obj have at leas one ref_shape and ref_shape have all the same shape type
+    # for material object:
+    # in GUI defined material_obj could have no RefShape and RefShapes could be different type
+    # we gone need the RefShapes to be the same type inside one fem_doc_object
+    # TODO here: check if all RefShapes inside the object really have the same type
+    import FemMeshTools
+    if hasattr(fem_doc_object, 'References') and fem_doc_object.References:
+        first_ref_obj = fem_doc_object.References[0]
+        first_ref_shape = FemMeshTools.get_element(first_ref_obj[0], first_ref_obj[1][0])
+        st = first_ref_shape.ShapeType
+        print(fem_doc_object.Name + ' has ' + st + ' reference shapes.')
+        return st
+    else:
+        print(fem_doc_object.Name + ' has empty References.')
+        return ''
+
 ##  @}