René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Setting alpha on legend handle changes patch color","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\n\r\nI occasionally want the alpha value of the patch in a histogram's legend to be different than the alpha value used to plot the legend.  However, when I call `set_alpha` on a legend handle, the color of the patch in the legend changes.\r\n\r\n**Code for reproduction**\r\n\r\n\u003c!--A minimum code snippet required to reproduce the bug, also minimizing the number of dependencies required--\u003e\r\n\r\n```python\r\nimport matplotlib.pyplot as plt\r\n\r\nplt.hist([1, 2, 3], alpha = 0.25, label = 'data', color = 'red')\r\nlegend = plt.legend()\r\nfor lh in legend.legendHandles:\r\n    lh.set_alpha(1.0)\r\n```\r\n\r\n**Actual outcome**\r\n\r\n![image](https://user-images.githubusercontent.com/2431900/42916377-e3e2c770-8ad2-11e8-9a9d-77f0db02e7a2.png)\r\n\r\n**Work-around**\r\n\r\nI can get the result I desire if I call `set_edgecolor()` and `set_facecolor()`:\r\n\r\n```python\r\nplt.hist([1, 2, 3], alpha = 0.25, label = 'data', color = 'red')\r\nlegend = plt.legend()\r\nfor lh in legend.legendHandles:\r\n    lh.set_facecolor(lh.get_facecolor())\r\n    lh.set_edgecolor(lh.get_edgecolor())\r\n    lh.set_alpha(1.0)\r\n```\r\n\r\n**Expected outcome**\r\n\r\n![image](https://user-images.githubusercontent.com/2431900/42916427-26b11bd8-8ad3-11e8-8a68-d6fc1a08efeb.png)\r\n\r\n**Matplotlib version**\r\n- Matplotlib v2.2.2\r\n- Installed from Anaconda (default channel)\r\n- Backend: module://ipykernel.pylab.backend_inline\r\n- Jupyter version: 5.5.0\r\n\r\n\r\n","author":{"url":"https://github.com/bpteague","@type":"Person","name":"bpteague"},"datePublished":"2018-07-19T01:41:59.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":11},"url":"https://github.com/11702/matplotlib/issues/11702"}