/usr/lib/python2.7/dist-packages/dolfin/mesh/refinement.py is in python-dolfin 1.3.0+dfsg-2.
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# Copyright (C) 2009 Anders Logg
#
# This file is part of DOLFIN.
#
# DOLFIN 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 3 of the License, or
# (at your option) any later version.
#
# DOLFIN 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 DOLFIN. If not, see <http://www.gnu.org/licenses/>.
#
# First added: 2010-02-26
# Last changed: 2010-02-26
__all__ = ["refine"]
# Import C++ interface
import dolfin.cpp as cpp
def refine(mesh, cell_markers=None, redistribute=True):
"""
Refine given mesh and return the refined mesh.
*Arguments*
mesh
the :py:class:`Mesh <dolfin.cpp.Mesh>` to be refined.
cell_markers
an optional argument (a boolean :py:class:`MeshFunction
<dolfin.cpp.MeshFunctionBool>` over cells) may be given
to specify which cells should be refined. If no cell
markers are given, then the mesh is refined uniformly.
redistribute
an optional argument (boolean) may be given to set whether
to redistribute the mesh across processes following
refinement. The is relevant only when the mesh is
distributed across processes. In serial the argument has
no impact. Default it True.
*Examples of usage*
.. code-block:: python
mesh = refine(mesh)
To only refine cells with too large error, define a boolean
MeshFunction over the mesh and mark the cells to be refined
as True.
.. code-block:: python
cell_markers = CellFunction("bool", mesh)
cell_markers.set_all(False)
for cell in cells(mesh):
# set cell_markers[cell] = True if the cell's error
# indicator is greater than some criterion.
mesh = refine(mesh, cell_markers)
"""
# This function is necessary to avoid copying in the wrapped
# versions of the return-by-value refine functions in C++.
# Create empty mesh
refined_mesh = cpp.Mesh()
# Call C++ refinement
if cell_markers is None:
cpp.refine(refined_mesh, mesh, redistribute)
else:
cpp.refine(refined_mesh, mesh, cell_markers, redistribute)
return refined_mesh
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