FEM: constant vacuum permittivity, add object to overwrite constant

src/Mod/Fem/femobjects/constant_vacuumpermittivity.py

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+# ***************************************************************************
+# *   Copyright (c) 2020 Bernd Hahnebach <bernd@bimstatik.org>              *
+# *                                                                         *
+# *   This file is part of the FreeCAD CAx development system.              *
+# *                                                                         *
+# *   This program is free software; you can redistribute it and/or modify  *
+# *   it under the terms of the GNU Lesser General Public License (LGPL)    *
+# *   as published by the Free Software Foundation; either version 2 of     *
+# *   the License, or (at your option) any later version.                   *
+# *   for detail see the LICENCE text file.                                 *
+# *                                                                         *
+# *   This program is distributed in the hope that it will be useful,       *
+# *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+# *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+# *   GNU Library General Public License for more details.                  *
+# *                                                                         *
+# *   You should have received a copy of the GNU Library General Public     *
+# *   License along with this program; if not, write to the Free Software   *
+# *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  *
+# *   USA                                                                   *
+# *                                                                         *
+# ***************************************************************************
+
+__title__ = "FreeCAD FEM constant vacuum permittivity object"
+__author__ = "Bernd Hahnebach"
+__url__ = "http://www.freecadweb.org"
+
+## @package constant_vacuumpermittivity
+#  \ingroup FEM
+#  \brief FreeCAD FEM constant vacuum permittivity object
+
+from FreeCAD import Units
+
+from femtools import constants
+from . import base_fempythonobject
+
+
+class ConstantVacuumPermittivity(base_fempythonobject.BaseFemPythonObject):
+
+    Type = "Fem::ConstantVacuumPermittivity"
+
+    def __init__(self, obj):
+        super(ConstantVacuumPermittivity, self).__init__(obj)
+        obj.addProperty(
+            "App::PropertyVacuumPermittivity",
+            "VacuumPermittivity",
+            "Constants",
+            "Set the permittivity of vacuum"
+        )
+        obj.VacuumPermittivity = Units.Quantity(constants.vacuum_permittivity())