/usr/share/pyshared/dolfin/common/plotting.py is in python-dolfin 1.0.0-7.
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# Copyright (C) 2008 Joachim B. Haga
#
# 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 Martin Sandve Alnaes, 2008.
# Modified by Anders Logg, 2008-2010.
#
# First added: 2008-03-05
# Last changed: 2010-12-08
import os
import dolfin.cpp as cpp
from donothing import DoNothing
from dolfin.functions.function import Function
import ufl
__all__ = ['Viper', 'plot', 'update', 'interactive', 'save_plot', 'figure']
def make_viper_object(object, mesh=None):
for plottype,classes in viper_dolfin.plottable:
if isinstance(object, classes):
return object
if isinstance(object, cpp.DirichletBC):
bc = object
V = bc.function_space()
v = Function(V)
bc.apply(v.vector())
return v
# Try projecting function or expression
from dolfin.fem.projection import project
try:
u = project(object, mesh=mesh)
cpp.info("Object cannot be plotted directly, projecting to piecewise linears.")
return u
except:
raise RuntimeError, ("Don't know how to plot given object and projection failed: " + str(object))
# Intelligent plot command that handles projections and different objects
# (aliased as 'plot')
def dolfin_plot(object, *args, **kwargs):
"""
Plot given object using Viper.
*Arguments*
object
a :py:class:`Mesh <dolfin.cpp.Mesh>`, a :py:class:`MeshFunction
<dolfin.cpp.MeshFunction>`, a :py:class:`Function
<dolfin.functions.function.Function>` or a
:py:class:`FiniteElement <ufl.FiniteElement>`.
*Examples of usage*
In the simplest case, to plot only e.g. a mesh, simply use
.. code-block:: python
mesh = UnitSquare(4,4)
plot(mesh)
Use the ``title`` argument to specify title of the plot
.. code-block:: python
plot(mesh, tite="Finite element mesh")
Specify the mesh when plotting a Function
.. code-block:: python
plot(v, mesh=mesh, title="My Function")
It is also possible to plot an element
.. code-block:: python
element = FiniteElement("BDM", tetrahedron, 3)
plot(element)
A more advanced example
.. code-block:: python
plot(u,
mode = "displacement",
mesh = mesh,
wireframe = True,
interactive = True, # hold plot on screen
axes = True, # include axes
basename = "displacement", # default plotfile name
rescale = False)
"""
# Plot element
if isinstance(object, ufl.FiniteElementBase):
import ffc
return ffc.plot(object, *args, **kwargs)
# Check expression
if isinstance(object, cpp.Expression) and "mesh" not in kwargs:
raise TypeError, "expected a mesh when plotting an expression."
mesh = kwargs.get('mesh')
return viper_dolfin.plot(make_viper_object(object, mesh=mesh), *args, **kwargs)
# Check DOLFIN_NOPLOT
do_nothing = False
if os.environ.has_key('DOLFIN_NOPLOT'):
cpp.info("DOLFIN_NOPLOT set, plotting disabled.")
do_nothing = True
else:
# Check for Viper
try:
from viper import viper_dolfin
for x in __all__:
exec ('from viper.viper_dolfin import %s' % x)
plot = dolfin_plot
except ImportError, details:
cpp.warning(str(details))
cpp.warning("Unable to import Viper, plotting disabled.")
do_nothing= True
# Ignore all plot calls
if do_nothing:
for x in __all__:
exec('%s = DoNothing' % x)
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