René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"incorrect cbar minor ticks for extend regions when x/ytick.minor.visible is True","articleBody":"\u003c!--To help us understand and resolve your issue, please fill out the form to the best of your ability.--\u003e\r\n\u003c!--You can feel free to delete the sections that do not apply.--\u003e\r\n\r\n### Bug report\r\n\r\n**Bug summary**\r\nColorbars have their own `minorticks_on/off` methods to address the issue of minorticks extending into the \"extend\" regions (see #11584).\r\n\r\nSince colorbar axes are instances of normal axes, setting `rcParams['y/xtick.minor.visible'] = True`\r\nresults in minorticks being drawn on the colorbar axes using the axes methods (which don't take into account the \"extend\" regions). \r\n\r\n\r\n\r\n**Code for reproduction**\r\n```python\r\nimport matplotlib.pyplot as plt\r\nimport numpy as np\r\n\r\n# Making yticks longer in length to highlight the issue\r\nplt.rcParams['ytick.major.size'] = 10\r\nplt.rcParams['ytick.minor.size'] = 4\r\nplt.rcParams['ytick.minor.visible'] = True\r\n# Similar issue with plt.rcParams['xtick.minor.visible'] = True and horizontal colorbar\r\n\r\nnp.random.seed(seed=12345)\r\nx = np.random.randn(20, 20)\r\nfig, ax = plt.subplots(figsize=(4, 3), constrained_layout=True)\r\nim = ax.pcolormesh(x)\r\n\r\ncbar = fig.colorbar(im, extend='both', orientation='vertical')\r\n# Similar issue with plt.rcParams['xtick.minor.visible'] = True and horizontal colorbar\r\nfig.savefig('cbar_minorticks_issue.png')\r\n```\r\n\u003c!--A minimum code snippet required to reproduce the bug.\r\nPlease make sure to minimize the number of dependencies required, and provide\r\nany necessary plotted data.\r\nAvoid using threads, as Matplotlib is (explicitly) not thread-safe.--\u003e\r\n\r\n\r\n**Actual outcome**\r\n![cbar_minorticks_issue](https://user-images.githubusercontent.com/15175620/74202311-173e6280-4c3a-11ea-9712-98889fe758b5.png)\r\n \r\n**Expected outcome**\r\n![cbar_minorticks_fixed](https://user-images.githubusercontent.com/15175620/74202333-27564200-4c3a-11ea-9441-51a78a04c2dc.png) \r\n\r\n**Matplotlib version**\r\n\u003c!--Please specify your platform and versions of the relevant libraries you are using:--\u003e\r\n  * Operating system:\r\n  * Matplotlib version: \r\n  * Matplotlib backend (`print(matplotlib.get_backend())`):\r\n  * Python version:\r\n  * Jupyter version (if applicable):\r\n  * Other libraries: \r\n\r\n\u003c!--Please tell us how you installed matplotlib and python e.g., from source, pip, conda--\u003e\r\n\u003c!--If you installed from conda, please specify which channel you used if not the default--\u003e\r\n\r\n","author":{"url":"https://github.com/pharshalp","@type":"Person","name":"pharshalp"},"datePublished":"2020-02-11T00:21:29.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/16468/matplotlib/issues/16468"}