/usr/lib/python2.7/dist-packages/dolfin/mesh/meshes.py is in python-dolfin 1.3.0+dfsg-2.
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# Copyright (C) 2012 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/>.
#
# Modified by Marie E. Rognes (meg@simula.no)
#
# First added: 2012-01-12
# Last changed: 2013-03-11
__all__ = []
# Import SWIG-generated extension module (DOLFIN C++)
import dolfin.cpp as cpp
# Replacement constructor for Mesh class. We cannot create a Python
# subclass of cpp.Mesh since then isinstance(UnitSquare, Mesh) would
# not be true.
def __init__(self, *args, **kwargs):
"""Create a mesh from a filename or a geometry.
A mesh may be created from a given filename, which should contain
mesh data stored in DOLFIN XML format:
.. code-block:: python
mesh = Mesh("mesh.xml")
An empty mesh may be created as follows:
.. code-block:: python
mesh = Mesh()
A copy of a mesh may be created as follows:
.. code-block:: python
mesh_copy = Mesh(mesh)
A mesh may also be created from a CSG geometry and a resolution:
.. code-block:: python
mesh = Mesh(geometry, resolution)
"""
# Reuse C++ doc-string too
__doc__ = cpp.Mesh.__doc__
# Initialize base class
cpp.Mesh.__cppinit__(self, *args, **kwargs)
# Change mesh constructor
cpp.Mesh.__cppinit__ = cpp.Mesh.__init__
cpp.Mesh.__init__ = __init__
# Attach ipython notebook svg rendering function for 1D and 2D meshes
def mesh2svg(mesh):
c = mesh.cells()
# TODO: Abort if c.shape[0] is too large?
x = mesh.coordinates()
d = x.shape[1]
cellname = mesh.ufl_cell().cellname()
assert (cellname == "triangle" and d == 2 and c.shape[1] == 3)
mesh_origin = [x[:,k].min() for k in range(d)]
x_min= [x[:,k].min() for k in range(d)]
x_max= [x[:,k].max() for k in range(d)]
mesh_width = x_max[0]-x_min[0]
mesh_height = x_max[1]-x_min[1]
display_width = 600.0
scale = float(display_width / mesh_width)
polyline = '<polyline points="%s" style="fill:none;stroke:black;stroke-width:2" />'
polygons = []
nv = c.shape[1]
p = [None]*(nv+1)
for i in range(c.shape[0]):
for j in range(nv):
x0, x1 = x[c[i,j],:]
x0 = x0 - x_min[0]
x1 = x_max[1] - x1
p[j] = "%d,%d" % (int(scale*x0), int(scale*x1))
p[nv] = p[0]
polygons.append(polyline % " ".join(p))
return '<svg xmlns="http://www.w3.org/2000/svg" version="1.1">\n%s\n</svg>' % '\n'.join(polygons)
cpp.Mesh._repr_svg_ = mesh2svg
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