On Wed, Sep 23, 2009 at 12:56 PM, Andrew Straw <straw...@astraw.com> wrote:
> John Hunter wrote:
>> On Wed, Sep 23, 2009 at 12:42 PM, Andrew Straw <straw...@astraw.com> wrote:
>>
>>
>>> Sorry, I should have been more clear. I was thinking that the
>>> image_compare() decorator would call the test function multiple times,
>>> having switched the backend between invocations. Thus, the call to
>>> savefig() would continue not to explicitly set the extension. I've
>>> quickly modified the source to reflect my idea, but I haven't had a
>>> chance to flesh it out or test it. It should show the idea, though. See
>>> attached.
>>>
>>
>> Why not have the decorator pass the extension in to the test funcs --
>> agg can print to pdf, ps, svg and png
>>
> I'm not sure what you're suggesting. Presumably if we're driving agg OK
> to draw .png, it will also draw .pdf OK (or does it have a pdf vector
> backend independent of the MPL pdf backend that we want to test separately?)
No, it doesn't have a separate backend, but the backend_agg figure
canvas savefig method knows how to create FigureCanvasPDF etc to use
that backend to write the file w/o having to switch the default
backend with all the attendant hassles. So if you are using *Agg, and
do
savefig(somefile.pdf)
agg will load the native pdf backend and use it. So I was envisioning
def test_something(ext):
make_plot
fig.savefig('myfile.%s'%ext)
and having the decorator pass in the extensions it wants one-by-one
JDH
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