Re: [matplotlib-devel] pylab.imshow() does not handle clip_path properly

[Gellule Xg <gel...@fr...>]

>> This is a bug report for matplotlib version 0.99.1.1
>>
>> The clip_path keyword of imshow() does not work when setting it to 
>> (Path, Transform) for two reasons:
> 
> Hi, Thanks for the report. Do you have a simple test script that we can
> use to see the problem and then fix it? We will then use this as the
> basis to create a test function to make sure the issue never "crops" up
> again.
> 
> -Andrew

Hi Andrew,
Please try the following. It's a script that clips an NxN image based on 
its contour.
Thanks,
-Julien


import numpy
import pylab

#Create a NxN image
N=100
(x,y) = numpy.indices((N,N))
x -= N/2
y -= N/2
r = numpy.sqrt(x**2+y**2-x*y)

#Create a contour plot at N/4 and extract both the clip path and transform
c=pylab.contour(r,[N/4])
clipPath = c.collections[0].get_paths()[0]
clipTransform = c.collections[0].get_transform()

#Plot the image clipped by the contour
pylab.imshow(r, clip_path=(clipPath,clipTransform))
pylab.show()