Thanks for the reminder. It wasn't propagating the "non-affine"
invalidation correctly. I think I have a fix in r6465, but please let
me know if you see anything else funny.
Cheers,
Mike
Eric Firing wrote:
> Mike,
>
> This is a gentle check--I suspect my original message, below, may have
> slipped under the radar.
>
> Eric
>
> Eric Firing wrote:
>> Mike (or other transforms afficionados),
>>
>> The thread "[Matplotlib-users] Bug saving semilogy plots with a
>> axvline" started by [EMAIL PROTECTED] pointed to a bug that appears to
>> be deep in the transforms code. My head is spinning. The problem
>> seems to be related to the propagation of the _invalid attribute in
>> transforms, in the case of a mixed data/axes transform such as
>> ashline uses. The following one-line change in TransformNode, second
>> line from the bottom, works:
>>
>> def invalidate(self):
>> """
>> Invalidate this :class:`TransformNode` and all of its
>> ancestors. Should be called any time the transform changes.
>> """
>> # If we are an affine transform being changed, we can set the
>> # flag to INVALID_AFFINE_ONLY
>> value = (self.is_affine) and self.INVALID_AFFINE or
>> self.INVALID
>>
>> # Shortcut: If self is already invalid, that means its parents
>> # are as well, so we don't need to do anything.
>> if self._invalid == value:
>> return
>>
>> if not len(self._parents):
>> self._invalid = value
>> return
>>
>> # Invalidate all ancestors of self using pseudo-recursion.
>> parent = None
>> stack = [self]
>> while len(stack):
>> root = stack.pop()
>> # Stop at subtrees that have already been invalidated
>> if root._invalid != value or root.pass_through:
>> root._invalid = self.INVALID # value <===========
>> stack.extend(root._parents.keys())
>>
>> Now, I know this is the wrong solution, because it defeats all the
>> cleverness with the _invalid values; but perhaps it will save you a
>> few minutes in finding the right solution.
>>
>> To reproduce the problem, do this in ipython -pylab:
>>
>> axhline(5)
>> yscale('log')
>> ylim(0.5,30)
>>
>> Eric
>>
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--
Michael Droettboom
Science Software Branch
Operations and Engineering Division
Space Telescope Science Institute
Operated by AURA for NASA
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