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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: Horizontal colorbars drawn incorrectly with hatches","articleBody":"### Bug summary\n\nWhen specifying hatches for `contourf,` the colorbar is drawn correctly for vertical colorbars but not for horizontal ones. The Hatches and colorfill only fill the lower diagonal of the colorbar boxes.\n\n### Code for reproduction\n\n```python\nimport matplotlib.pyplot as plt\r\nimport numpy as np\r\n\r\nimport matplotlib.pyplot as plt\r\nimport numpy as np\r\n\r\n# invent some numbers, turning the x and y arrays into simple\r\n# 2d arrays, which make combining them together easier.\r\nx = np.linspace(-3, 5, 150).reshape(1, -1)\r\ny = np.linspace(-3, 5, 120).reshape(-1, 1)\r\nz = np.cos(x) + np.sin(y)\r\n\r\n# we no longer need x and y to be 2 dimensional, so flatten them.\r\nx, y = x.flatten(), y.flatten()\r\n\r\nfig1, ax1 = plt.subplots()\r\ncs = ax1.contourf(x, y, z, hatches=['-', '/', '\\\\', '//'],\r\n                  cmap='gray', extend='both', alpha=0.5)\r\n\r\nfig1.colorbar(cs, orientation='horizontal')\r\nplt.show()\n```\n\n\n### Actual outcome\n\n![actual_colobar](https://user-images.githubusercontent.com/42781301/180038311-1100fca9-bbaa-4baa-93fb-97ccc56d8260.png)\r\n\n\n### Expected outcome\n\n![expected_colorbar](https://user-images.githubusercontent.com/42781301/180038758-eb0177ff-52c8-49cf-9fd4-d927fc4170b6.png)\r\n\n\n### Additional information\n\nThe bug occurs when the colorbar is horizontal and the `contourf` call uses hatches. Changing the kwargs `extend`, `cmap`, `colors`, `alpha`, etc when calling `contourf` does *not* resolve the bug. \r\n\r\nThe bug does *not* occur when the colorbar is vertical with hatches nor when the colorbar is horizontal and no hatches are used.\r\n\r\n*Potential Solution*:\r\nIn colorbar.py, change line 637 to the following:\r\n`xy = np.array([[X[i, 0], Y[i, 1]],`\r\n\r\nThis doesn't cause issues when hatches are not used. It also doesn't cause problems with vertical colorbars.\n\n### Operating system\n\nmacOS Big Sur Version 11.3.1 with Intel Silicon\n\n### Matplotlib Version\n\n3.5.2\n\n### Matplotlib Backend\n\nmodule://backend_interagg\n\n### Python version\n\n3.10.5\n\n### Jupyter version\n\n_No response_\n\n### Installation\n\nconda","author":{"url":"https://github.com/hCraker","@type":"Person","name":"hCraker"},"datePublished":"2022-07-20T20:41:26.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":8},"url":"https://github.com/23456/matplotlib/issues/23456"}