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[ENH]: Zoom in/out on rolling the mouse wheel #28412
Description
Problem
- This seems to be a common expectation
- Various implementations can be found online to add this capability
- It might be nice if it came with matplotlib out-of-the-box automatically
Proposed solution
Implementations with various levels of sophistication can be found on the web, e.g.,
- https://gist.github.com/tacaswell/3144287
- https://mpl-interactions.readthedocs.io/en/stable/examples/zoom-factory.html
- https://gist.github.com/t20100/e5a9ba1196101e618883
- https://stackoverflow.com/questions/11551049/matplotlib-plot-zooming-with-scroll-wheel
- https://discuss.wxpython.org/t/scroll-wheel-map-zoom/36016/10
Activity
timhoffm commentedon Jun 18, 2024
See #20317 as a proof of concept.
What needs to be done:
Help is welcome.
MischaMegens2 commentedon Jun 18, 2024
And there is also #18159.
MischaMegens2 commentedon Jun 18, 2024
As for requirements:
I don't think removing the toolbar Zoom and Pan buttons altogether is opportune:
So I'd suggest we limit the changes to:
in combination with ctrl, or with shift: zoom only horizontally, or only vertically
timhoffm commentedon Jun 19, 2024
Are these standard combinations? If not, we should carefully consider which modifiers should which operations.
MischaMegens2 commentedon Jun 19, 2024
It seems there are no standard modifiers. (It seems there is even disagreement as to which way of rolling the wheel zooms 'in' vs. 'out'). rcParams are in order. But the use of modifiers generalizes nicely for 3d plots ('alt' for only zooming x axis, 'ctrl' for y, 'shift' for z'; 'ctrl+shift' for zooming in x and y while leaving z fixed, etc.)
Alternatively, when the mouse pointer is over an axis, we could zoom in the corresponding direction only.
Or both functionalities could be provided.
timhoffm commentedon Jul 17, 2024
Minimal proposal: Scroll up/down without modifiers = zoom in/out to the cursor, keeping aspect ratio.
Direction: Consistent with zooming in maps, and browsers (while they additionally need a modifier, the up=magnification relation matches)
Modifiers can be discussed and added later.
MischaMegens2 commentedon Jul 17, 2024
?
timhoffm commentedon Jul 17, 2024
Typo. Both cases interpret scroll-up as magnification