8000 Refactor mechanism for saving files. by pwuertz · Pull Request #2588 · matplotlib/matplotlib · GitHub
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Refactor mechanism for saving files. #2588

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Nov 27, 2013
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Refactor mechanism for saving files. #2588

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8159c81
Refactor mechanism for saving files.
pwuertz Nov 9, 2013
522fbe7
Better documentation for print_figure refactoring.
pwuertz Nov 26, 2013
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Better documentation for print_figure refactoring.
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@pwuertz
pwuertz committed Nov 26, 2013
commit 522fbe78c75e01b5ec34613efd81cd638a8a235d
8 changes: 6 additions & 2 deletions lib/matplotlib/backend_bases.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2018,7 +2018,11 @@ def get_supported_filetypes_grouped(cls):
groupings[name].sort()
return groupings

def _get_print_canvas(self, format):
def _get_output_canvas(self, format):
"""Return a canvas that is suitable for saving figures to a specified
file format. If necessary, this function will switch to a registered
backend that supports the format.
"""
method_name = 'print_%s' % format

# check if this canvas supports the requested format
Expand Down Expand Up @@ -2092,7 +2096,7 @@ def print_figure(self, filename, dpi=None, facecolor='w', edgecolor='w',
format = format.lower()

# get canvas object and print method for format
canvas = self._get_print_canvas(format)
canvas = self._get_output_canvas(format)
print_method = getattr(canvas, 'print_%s' % format)

if dpi is None:
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10 changes: 9 additions & 1 deletion lib/matplotlib/backends/backend_template.py
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Expand Up @@ -31,11 +31,19 @@
import matplotlib
matplotlib.use('module://my_backend')

where my_backend.py is your module name. Thus syntax is also
where my_backend.py is your module name. This syntax is also
recognized in the rc file and in the -d argument in pylab, eg::

python simple_plot.py -dmodule://my_backend

If your backend implements support for saving figures (i.e. has a print_xyz()
method) you can register it as the default handler for a given file type

from matplotlib.backend_bases import register_backend
register_backend('xyz', 'my_backend', 'XYZ File Format')
...
plt.savefig("figure.xyz")

The files that are most relevant to backend_writers are

matplotlib/backends/backend_your_backend.py
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