Fix containment test with nonlinear transforms. #7844

anntzer · 2017-01-16T19:51:47Z

Fixes #3540; see in particular #3540 (comment).

Edit: Also fixes #7655.

@mdboom Would it be reasonable to remove the definition of Transform.__array__ and only keep Affine2D.__array__, thus forcing call sites to explicitly only pass in affine transforms to the C++ code, rather than sometimes silently dropping the nonlinear part (as in this case)?

codecov-io · 2017-01-16T23:44:46Z

Current coverage is 62.10% (diff: 60.00%)

Merging #7844 into master will increase coverage by <.01%

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  Lines         56051      56054     +3   
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+ Hits          34808      34811     +3   
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NelleV · 2017-01-28T19:46:42Z

Can you add a regression test?

anntzer · 2017-01-28T21:37:58Z

Done.

NelleV

It looks good.
Can you move the import at the top of module?

NelleV · 2017-01-28T21:40:52Z

lib/matplotlib/path.py

-        result = _path.point_in_path(point[0], point[1], radius, self,
-                                     transform)
-        return result
+        from .transforms import Affine2D


Any reason to have this here and not at the top of the module as python convention require?

Probably dates back to when I implemented this as a quickfix. Moved up.

anntzer · 2017-01-28T22:08:33Z

Actually there is a circular import between transforms.py and path.py, so I left the Affine2D import inside the function, with a note to that effect.

anntzer · 2017-01-28T22:43:08Z

Test failure is probably related to pytest migration... we can wait until it is done, as that seems close(?).

NelleV · 2017-01-29T19:14:12Z

Let's wait until the pytest migration is over.

But, can we fix the circular import in a more robust way?

anntzer · 2017-01-29T20:12:25Z

This would likely imply a small performance cost as transforms relies on passing a Path to update_path_extent to compute not only extremal points (which is just as cheap in numpy) but also minpos (and x[x > 0].min() is very likely slower than a C loop). (Fixing #7413 would probably help.)

NelleV · 2017-01-29T20:33:42Z

I would feel much more comfortable with fixing the circular import.

anntzer · 2017-01-29T20:36:55Z

There's also transform_path_affine, which currently reads

    def transform_path_affine(self, path):
        return Path(self.transform_affine(path.vertices),
                    path.codes, path._interpolation_steps)

and would have to become something like

    def transform_path_affine(self, path):
        return type(path)(self.transform_affine(path.vertices),
                    path.codes, path._interpolation_steps)

which is worse than a circular import IMO.

I don't think this should be merge with a circular import.

anntzer · 2017-02-21T00:52:48Z

What is you preferred solution other than the circular import, then? As mentioned above I can work around it by obfuscating the implementation of transform_path_affine to sneakily get a handle to the Path class without a circular import, but that's not really better IMO.

tacaswell · 2017-02-21T01:31:58Z

lib/matplotlib/path.py

+        # We need to import Affine2D here to prevent a circular import between
+        # the .path and .transforms modules.
+        from .transforms import Affine2D
+        if transform and not isinstance(transform, Affine2D):


Can't this be if not transform.is_affine: ? That seems way better that isinstance anyway.

Good catch, done.

NelleV

LGTM 👍

dstansby · 2017-03-19T19:02:42Z

lib/matplotlib/tests/test_path.py

+    polygon = ax.axvspan(1, 10)
+    assert polygon.get_path().contains_point(
+        ax.transData.transform_point((5, .5)), ax.transData)
+


May also be worth checking that the points (0.5, 0.5) and (20, 0.5) are not inside polygon

dstansby · 2017-03-19T19:06:26Z

lib/matplotlib/path.py

+        # transform the path ourselves.  If `transform` is affine, letting
+        # `point_in_path` handle the transform avoids allocating an extra
+        # buffer.
+        if transform and not transform.is_affine:


Is there a reason not to just do the transformation here even if it is an affine transformation? (thus removing the if block)

I guess you may save the creation of a large temporary (if the c++ code does the transform one point at a time), which would be relevant for very large paths.

To be honest I don't know but decided not to take any risks.

dstansby

👍 Will merge if/when tests pass

anntzer mentioned this pull request Jan 17, 2017

Event picking does not seem to work on polar bar plots #7655

Closed

NelleV previously approved these changes Jan 28, 2017

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anntzer force-pushed the nonlinear-transformed-path-containment branch from 652371f to ac133e8 Compare January 28, 2017 21:45

anntzer mentioned this pull request Jan 28, 2017

Deprecate Transform.__array__ in favor of Transform.get_affine and Affine2D.__array__ #7975

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anntzer force-pushed the nonlinear-transformed-path-containment branch from ac133e8 to 7d67293 Compare January 28, 2017 22:07

NelleV changed the title ~~Fix containment test with nonlinear transforms.~~ [MRG+1] Fix containment test with nonlinear transforms. Jan 29, 2017

NelleV changed the title ~~[MRG+1] Fix containment test with nonlinear transforms.~~ Fix containment test with nonlinear transforms. Jan 29, 2017

tacaswell reviewed Feb 21, 2017

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Fix containment test with nonlinear transforms.

15eb7e7

anntzer force-pushed the nonlinear-transformed-path-containment branch from 7d67293 to ffd60aa Compare February 21, 2017 01:46

anntzer mentioned this pull request Feb 22, 2017

Default legend location 'best' is extremely slow #8108

Open

tacaswell added this to the 2.1 (next point release) milestone Feb 23, 2017

anntzer changed the title ~~Fix containment test with nonlinear transforms.~~ [MRG] Fix containment test with nonlinear transforms. Mar 15, 2017

NelleV approved these changes Mar 19, 2017

View reviewed changes

NelleV changed the title ~~[MRG] Fix containment test with nonlinear transforms.~~ [MRG+"] Fix containment test with nonlinear transforms. Mar 19, 2017

NelleV changed the title ~~[MRG+"] Fix containment test with nonlinear transforms.~~ [MRG+1] Fix containment test with nonlinear transforms. Mar 19, 2017

dstansby reviewed Mar 19, 2017

View reviewed changes

Test path containment w/ nonlin. transforms; group containment tests.

76173e1

anntzer force-pushed the nonlinear-transformed-path-containment branch from ffd60aa to 76173e1 Compare March 19, 2017 19:11

dstansby approved these changes Mar 19, 2017

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dstansby self-assigned this Mar 19, 2017

dstansby merged commit 0611b61 into matplotlib:master Mar 19, 2017

dstansby changed the title ~~[MRG+1] Fix containment test with nonlinear transforms.~~ Fix containment test with nonlinear transforms. Mar 19, 2017

anntzer deleted the nonlinear-transformed-path-containment branch March 19, 2017 20:33

dstansby removed their assignment Apr 10, 2017

anntzer mentioned this pull request Aug 2, 2017

Patches cannot be picked when y-axis has logarithmic scaling #8979

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Fix containment test with nonlinear transforms. #7844

Fix containment test with nonlinear transforms. #7844

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Fix containment test with nonlinear transforms. #7844

Fix containment test with nonlinear transforms. #7844

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Current coverage is 62.10% (diff: 60.00%)

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