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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: Missing backcompat for backends not supporting hatchcolors in draw_quad_mesh","articleBody":"### Bug summary\n\n#29044 added a hatchcolors kwarg to backends' draw_path_collection and draw_quad_mesh; this includes an backcompat/escape hatch in draw_path_collection for third-party backends (e.g., mplcairo) that don't support for that kwarg (see discussion around https://github.com/matplotlib/matplotlib/pull/29044#issuecomment-2749198407 for why I think this should be in matplotlib and not in mplcairo); unfortunately the same escape hatch is also needed for draw_quad_mesh and is missing there.\n\n### Code for reproduction\n\n```Python\n# using mplcairo.qt, for example\nfrom pylab import *; hist2d(rand(10), rand(10))\n```\n\n### Actual outcome\n\ntraceback with\n```\n[...]\nTypeError: draw_quad_mesh(): incompatible function arguments. The following argument types are supported:\n    1. (self: mplcairo._mplcairo.GraphicsContextRendererCairo, arg0: mplcairo._mplcairo.GraphicsContextRendererCairo, arg1: object, arg2: int, arg3: int, arg4: numpy.ndarray[numpy.float64], arg5: numpy.ndarray[numpy.float64], arg6: object, arg7: numpy.ndarray[numpy.float64], arg8: object, arg9: numpy.ndarray[numpy.float64]) -\u003e None\n\nInvoked with:\n[...] kwargs: hatchcolors=[...]\n```\n\n### Expected outcome\n\nno error\n\n### Additional information\n\n_No response_\n\n### Operating system\n\nany\n\n### Matplotlib Version\n\n3.11.0.dev612+g77993d5536\n\n### Matplotlib Backend\n\nmodule://mplcairo.qt\n\n### Python version\n\n3.13\n\n### Jupyter version\n\nno\n\n### Installation\n\ngit checkout","author":{"url":"https://github.com/anntzer","@type":"Person","name":"anntzer"},"datePublished":"2025-04-07T16:42:31.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/29883/matplotlib/issues/29883"}