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# * Copyright (c) 2016 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 Python Mesh reader and writer"
__author__ = "Bernd Hahnebach"
__url__ = "https://www.freecad.org"
## @package importPyMesh
# \ingroup FEM
# \brief FreeCAD Python Mesh reader and writer for FEM workbench
import FreeCAD
from femmesh import meshtools
from builtins import open as pyopen
# ************************************************************************************************
# ********* generic FreeCAD import and export methods ********************************************
# names are fix given from FreeCAD, these methods are called from FreeCAD
# they are set in FEM modules Init.py
# export mesh to python
def export(objectslist, filename):
"called when freecad exports a file"
if len(objectslist) != 1:
FreeCAD.Console.PrintError("This exporter can only export one object.\n")
return
obj = objectslist[0]
if not obj.isDerivedFrom("Fem::FemMeshObject"):
FreeCAD.Console.PrintError("No FEM mesh object selected.\n")
return
femnodes_mesh = obj.FemMesh.Nodes
femelement_table = meshtools.get_femelement_table(obj.FemMesh)
if meshtools.is_solid_femmesh(obj.FemMesh):
fem_mesh_type = "Solid"
elif meshtools.is_face_femmesh(obj.FemMesh):
fem_mesh_type = "Face"
elif meshtools.is_edge_femmesh(obj.FemMesh):
fem_mesh_type = "Edge"
else:
FreeCAD.Console.PrintError("Export of this FEM mesh to Python not supported.\n")
return
f = pyopen(filename, "w")
write_python_mesh_to_file(femnodes_mesh, femelement_table, fem_mesh_type, f)
f.close()
# ************************************************************************************************
# ********* module specific methods **************************************************************
# writer:
# - a method directly writes a FemMesh to the mesh file
# - a method takes a file handle, mesh data and writes to the file handle
# ********* writer *******************************************************************************
def write(fem_mesh, filename):
"""directly write a FemMesh to a Python mesh file
fem_mesh: a FemMesh"""
if not fem_mesh.isDerivedFrom("Fem::FemMesh"):
FreeCAD.Console.PrintError("Not a FemMesh was given as parameter.\n")
return
femnodes_mesh = fem_mesh.Nodes
femelement_table = meshtools.get_femelement_table(fem_mesh)
if meshtools.is_solid_femmesh(fem_mesh):
fem_mesh_type = "Solid"
elif meshtools.is_face_femmesh(fem_mesh):
fem_mesh_type = "Face"
elif meshtools.is_edge_femmesh(fem_mesh):
fem_mesh_type = "Edge"
else:
FreeCAD.Console.PrintError("Export of this FEM mesh to Python not supported.\n")
return
f = pyopen(filename, "w")
write_python_mesh_to_file(femnodes_mesh, femelement_table, fem_mesh_type, f)
f.close()
def write_python_mesh_to_file(femnodes_mesh, femelement_table, fem_mesh_type, f):
mesh_name = "femmesh"
# nodes
f.write("def create_nodes(femmesh):\n")
f.write(" # nodes\n")
for node in femnodes_mesh:
# print(node, ' --> ', femnodes_mesh[node])
vec = femnodes_mesh[node]
f.write(f" {mesh_name}.addNode({vec.x}, {vec.y}, {vec.z}, {node})\n")
f.write(" return True\n")
f.write("\n\n")
# elements
f.write("def create_elements(femmesh):\n")
f.write(" # elements\n")
for element in femelement_table:
# print(element, ' --> ', femelement_table[element])
if fem_mesh_type == "Solid":
f.write(
" {}.addVolume({}, {})\n".format(
mesh_name, list(femelement_table[element]), element
)
)
elif fem_mesh_type == "Face":
f.write(
" {}.addFace({}, {})\n".format(
mesh_name, list(femelement_table[element]), element
)
)
elif fem_mesh_type == "Edge":
f.write(
" {}.addEdge({}, {})\n".format(
mesh_name, list(femelement_table[element]), element
)
)
f.write(" return True\n")
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