Propagate minpos from Collections to Axes.datalim #18642
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jklymak
reviewed
Oct 3, 2020
| @@ -274,11 +274,11 @@ def get_datalim(self, transData): | |||
| # can properly have the axes limits set by their shape + | |||
| # offset. LineCollections that have no offsets can | |||
| # also use this algorithm (like streamplot). | |||
| result = mpath.get_path_collection_extents( | |||
| transform.get_affine(), paths, self.get_transforms(), | |||
| return mpath.get_path_collection_extents( | |||
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again, this could get some more explanation, given that there is a comment above, but this is clearly different. I'm not even sure I understand why you can change this like this.
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The first argument is the master transform; instead of doing one transform when finding extents, and a second one after on the result, this does a combined transform from the get-go. This ensures that whatever is calculated for minpos is in the final coordinate space.
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tacaswell
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Oct 9, 2020
tacaswell
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Oct 9, 2020
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jklymak
reviewed
Oct 10, 2020
This is already calculated by the internal C++ code, but discarded at the end of the Python function.
This ensures that autoscaling on log scales is correct.
This test is a distilled out of matplotlib#16552.
This is mostly for the sake of third-party `Collection` subclasses that might have overridden `get_datalim`.
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PR Summary
This is an attempt to fix #16552. I'm not sure if it's the best change, API-wise, but seems to work without breaking anything. Possibly could do with an API change note.
Essentially, we have the right information to do log auto-scaling correct, but that's thrown away at the
Collection.get_datalim/Axes.add_collectioninterface. This propagates that information onto theBboxthat's passed between those two functions, and uses it when updatingAxes.dataLim.PR Checklist
pytestpasses).flake8on changed files to check).flake8-docstringsandpydocstyle<4and runflake8 --docstring-convention=all).doc/users/next_whats_new/(follow instructions in README.rst there).doc/api/next_api_changes/(follow instructions in README.rst there).