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# ***************************************************************************
# * Copyright (c) 2025 Mario Passaglia <mpassaglia[at]cbc.uba.ar> *
# * *
# * This file is part of FreeCAD. *
# * *
# * FreeCAD is free software: you can redistribute it and/or modify it *
# * under the terms of the GNU Lesser General Public License as *
# * published by the Free Software Foundation, either version 2.1 of the *
# * License, or (at your option) any later version. *
# * *
# * FreeCAD 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 *
# * Lesser General Public License for more details. *
# * *
# * You should have received a copy of the GNU Lesser General Public *
# * License along with FreeCAD. If not, see *
# * <https://www.gnu.org/licenses/>. *
# * *
# ***************************************************************************
__title__ = "FreeCAD FEM constraint electric charge density document object"
__author__ = "Mario Passaglia"
__url__ = "https://www.freecad.org"
## @package constraint_electricchargedensity
# \ingroup FEM
# \brief constraint electric charge density object
from FreeCAD import Units
from FreeCAD import Base
from . import base_fempythonobject
_PropHelper = base_fempythonobject._PropHelper
class ConstraintElectricChargeDensity(base_fempythonobject.BaseFemPythonObject):
Type = "Fem::ConstraintElectricChargeDensity"
def __init__(self, obj):
super().__init__(obj)
for prop in self._get_properties():
prop.add_to_object(obj)
def _get_properties(self):
prop = []
prop.append(
_PropHelper(
type="App::PropertyVolumeChargeDensity",
name="SourceChargeDensity",
group="Electric Charge Density",
doc="Free electric charge per unit volume at the sources",
value="0 C/mm^3",
)
)
prop.append(
_PropHelper(
type="App::PropertySurfaceChargeDensity",
name="InterfaceChargeDensity",
group="Electric Charge Density",
doc="Free electric charge per unit surface at the boundaries",
value="0 C/mm^2",
)
)
prop.append(
_PropHelper(
type="App::PropertyElectricCharge",
name="TotalCharge",
group="Electric Charge Density",
doc="Total free electric charge",
value="0 C",
)
)
prop.append(
_PropHelper(
type="App::PropertyBool",
name="Concentrated",
group="Electric Charge Density",
doc="Use concentrated charges at the nodes",
value=False,
)
)
prop.append(
_PropHelper(
type="App::PropertyEnumeration",
name="Mode",
group="Electric Charge Density",
doc="Switch quantity input mode",
value=["Interface", "Source", "Total Interface", "Total Source"],
)
)
return prop
def onDocumentRestored(self, obj):
print("restored", obj.Name)
# update old project with new properties
for prop in self._get_properties():
try:
obj.getPropertyByName(prop.name)
except Base.PropertyError:
prop.add_to_object(obj)
def onChanged(self, obj, prop):
print("change", prop)
if prop == "Mode":
if obj.Mode == "Total Source":
obj.setPropertyStatus("Concentrated", "-ReadOnly")
else:
obj.setPropertyStatus("Concentrated", "ReadOnly")
def get_total_source_density(self, obj):
"""
Calculate density for `Total Source` mode.
"""
size = 0
items = []
for feat, sub_elem in obj.References:
for name in sub_elem:
sub = feat.getSubObject(name)
if sub.ShapeType == "Solid":
size += sub.Volume
items.append(name)
elif sub.ShapeType == "Face":
size += sub.Area
items.append(name)
if items:
vol = Units.Quantity(f"{size} mm^3")
return obj.TotalCharge / vol
def get_total_interface_density(self, obj):
"""
Calculate density for `Total Interface` mode.
"""
size = 0
items = []
for feat, sub_elem in obj.References:
for name in sub_elem:
sub = feat.getSubObject(name)
if sub.ShapeType == "Face":
size += sub.Area
items.append(name)
elif sub.ShapeType == "Edge":
size += sub.Length
items.append(name)
if items:
area = Units.Quantity(f"{size} mm^2")
return obj.TotalCharge / area
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