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Text rotation patch #19114

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Text rotation patch #19114

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Alex-Carter01
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PR Summary

Resolves issue #13044. Fixing calculation error of Y-offset for specific rotation mode of text. This pull also includes a proposed minimal test (based off the original bug report).

PR Checklist

  • Has pytest style unit tests (and pytest passes).
  • Is Flake 8 compliant (run flake8 on changed files to check).
  • [N/A] New features are documented, with examples if plot related.
  • [N/A] Documentation is sphinx and numpydoc compliant (the docs should build without error).
  • Conforms to Matplotlib style conventions (install flake8-docstrings and run flake8 --docstring-convention=all).
  • [N/A] New features have an entry in doc/users/next_whats_new/ (follow instructions in README.rst there).
  • [N/A] API changes documented in doc/api/next_api_changes/ (follow instructions in README.rst there).

@Alex-Carter01
add comparison image for rotation test in test_text
8a6dc24
@Alex-Carter01
patch to rotation error in anchor, center_baseline mode
7c939d9 
fix to error in calculation of Y offset in text rotation.
todo: test and test baseline
@Alex-Carter01
add corresponding test for proposed patch to text rotation
762c32e 
see baseline_images for corresponding baseline
@jklymak
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jklymak commented Dec 15, 2020

Thanks a lot for the pull request! Unfortunately this broke some existing tests in test_text.py, so this isn't compatible with the existing behaviour. So you will either have to change the old tests and argue that they were wrong, or modify this....

@story645
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story645 commented Apr 6, 2021

hey @Alex-Carter01, do you have any bandwidth to finish up this PR?

@timhoffm timhoffm mentioned this pull request Apr 7, 2021
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@jklymak jklymak marked this pull request as draft April 23, 2021 16:58
@WeatherGod
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Oh, and we should double-check with the Cairo renderer, although I suspect it might have the same bug if this is happening at a layer above AGG/Cairo?

@safdarzareef safdarzareef mentioned this pull request Apr 24, 2021
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@dstansby
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Thanks for opening this PR. Unfortunately I don't think this is the correct fix. ymax1 - baseline / 2.0 seems to be the correct logic, putting the offset halfway between the baseline and ymax, so I think subtracting ymin1 is incorrect. As such I'm going to close this PR - if I've missed something feel free to comment and I will open it up again, and thanks again for the contribution.

@dstansby dstansby closed this Dec 18, 2021
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@Alex-Carter01 @jklymak @story645 @WeatherGod @dstansby