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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[MNT]: Remove origin and extents parameters from tricontour[f]()","articleBody":"### Summary\r\n\r\nfrom: https://github.com/matplotlib/matplotlib/pull/23995#discussion_r979445788\r\n\r\n`tricontour[f]` documents and accepts parameters `origin` and `extent`, but interestingly, they are not used :astonished:. They are only used in `contour[f]`, where one can leave out X and Y, in which case `origin` and `extent` define where to place the data in the Axes. When one thinks about it, this concept does obviously does not apply to triangular grids. One always has to specify x and y, either directly or via a `Triangulation.\r\n\r\nIt's a bit hard to see that `origin` and `extent` are unused, because they are passed through multiple levels of kwargs and are added as attributes to `ContourSet`, which is the common base class of `TriContourSet` and `QuadContourSet`. But `TriContourSet` does not use them. One can also check this by removing the validation checks on these values and then passing in nonsense values: The plot does not care. It seems this docstring part was copied from `contour[f]` without thinking about it.\r\n\r\n\r\n\r\n### Proposed fix\r\n\r\n*Goal*: Remove `origin` and `extents` parameters from `tricontour[f]()`\r\n\r\nThings to do:\r\n- Find out the how to properly handle `origin` and `extent`  in  the `ContourSet` class hierarchy. Likely move to `QuadContourSet`. But it might be that we have leave it in `ContourSet` but warn/error when used in `TriContourSet`.\r\n- Based on that determine the proper place to deprecate them.\r\n- Change the `tricontour[f]` docstring accordingly (deprecation statement and mention that they don't have any effect).\r\n- When the deprecation expires, clean up.\r\n\r\nNote: Nobody has complained that these parameters don't have any effect, so I assume nobody uses them intentionally. But since they are documented, I think we still have to jump the deprecation hoops.","author":{"url":"https://github.com/timhoffm","@type":"Person","name":"timhoffm"},"datePublished":"2022-09-25T19:20:46.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/24006/matplotlib/issues/24006"}