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Zero size figure use case #17093
Description
Bug report
Bug summary
I use matplotlib + PyQt5. The figure is placed inside a QSplitter (a standard Qt widget that consists of several vertical or horizontal parts which can be resized by handles between those parts) . When a part of QSplitter shrinks to a zero size it automatically resizes the widget it contains. Matplotlib raises an error as was mentioned in #16687.
Actual outcome
ValueError: figure size must be positive finite not [17.45 0. ]
Expected outcome
A zero height figure.
Matplotlib version
- Operating system: Kubuntu 19.10
- Matplotlib version: >=3.2.0 (installed by pip)
- Matplotlib backend: Qt5Agg
- Python version: 3.6.9
- Other libraries: PyQt5
Activity
tacaswell commentedon Apr 10, 2020
Fair enough.
I guess we need some checks for 0 size to bail as quickly as possible and make sure we don't segfault libpng in 3.2.x.
anntzer commentedon Apr 11, 2020
It didn't segfault libpng (we had a RuntimeError instead, afaict) and doesn't cause any problems (well, other than a SystemError) with Pillow. (I think especially on 3.3+ we should just propagate out whatever exception Pillow generates; if people want some other exception for zero-sized figure they should just argue about that on the Pillow tracker.)
MNT: allow 0 sized figures