René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[ENH]: Multi hatching in `ax.stackplot()`","articleBody":"### Problem\n\n`ax.stackplot()` is used for conveniently plotting stacked area plot.\r\n\r\nThe documentation says that any `**kwargs` is passed on to `ax.fill_between`.\r\n\r\nSo, it all works fine if I work with colours, but not so much with hatching pattern.\r\n\r\nIf I want to add hatching, this is what I get by default:\r\n```python\r\nimport matplotlib.pyplot as plt\r\nimport numpy as np\r\n\r\n# Data\r\ncols = 10\r\nrows = 4\r\n\r\ndata = (\r\n    np.reshape(np.arange(0, cols, 1), (1, -1)) ** 2\r\n    + np.reshape(np.arange(0, rows), (-1, 1))\r\n    + np.random.random((rows, cols))*5\r\n)\r\n\r\n# Plot\r\nfig, ax = plt.subplots(\r\n    figsize=(10,6),\r\n    facecolor=\"white\",\r\n    layout=\"constrained\"\r\n)\r\nfig.suptitle(\r\n    \"with hatching\",\r\n    fontsize=25,\r\n    weight=\"bold\"\r\n)\r\n\r\nx = range(data.shape[1])\r\nax.stackplot(\r\n    x, data,\r\n    hatch=\"x\"\r\n)\r\n\r\nax.set_xlim(0, 9)\r\nax.set_ylim(0, 350)\r\n```\r\n\r\nThe outcome:\r\n![image](https://github.com/matplotlib/matplotlib/assets/8880777/7b767630-2e72-4039-93b9-6d5cb6f53c8c)\r\n\r\nBut I would be more interested in getting something like this:\r\n![image](https://github.com/matplotlib/matplotlib/assets/8880777/feb3e55c-ba6f-4faf-b725-3d5934721a0a)\r\n\r\n\n\n### Proposed solution\n\nThe calling signature would be the same as before with exception that the `hatch` parameter would accept e.g. a list with `hatching` styles you want to use.\r\n\r\nExample:\r\n```python\r\nax.stackplot(\r\n    x, data,\r\n    hatch=[\"x\", \"\\\\\", \".\", \"-\"]\r\n)\r\n```\r\n\r\nThe example I've used above in the problem was create using the code below and in this case it varies the hatching by the density:\r\n```python\r\nfig, ax = plt.subplots(\r\n    figsize=(10,6),\r\n    facecolor=\"white\",\r\n    layout=\"constrained\"\r\n)\r\nfig.suptitle(\r\n    \"with individual hatching\",\r\n    fontsize=25,\r\n    weight=\"bold\"\r\n)\r\n\r\nx = range(data.shape[1])\r\nstack_baseline = np.zeros((data.shape[1]))\r\nfor i, y in enumerate(data):\r\n    ax.fill_between(\r\n        x, stack_baseline, y+stack_baseline,\r\n        facecolor=(1, 1, 1, 0),\r\n        hatch=\"x\"*(data.shape[0]-i)\r\n    )\r\n    stack_baseline += y\r\n\r\nax.set_xlim(0, 9)\r\nax.set_ylim(0, 350)\r\n```\r\n\r\n","author":{"url":"https://github.com/pawjast","@type":"Person","name":"pawjast"},"datePublished":"2023-10-19T14:04:49.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":6},"url":"https://github.com/27146/matplotlib/issues/27146"}