René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"urls are ignored when rendering a QuadMesh to SVG","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've passed `urls` arg in the `Axes.pcolormesh()` method to set URLs in a QuadMesh, but when I save it to SVG the URLs are missing.\r\n\r\nI traced it to the `RendererBase.draw_quad_mesh()` method which passes `[None]` as the urls argument to `self.draw_path_collection()`.\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 numpy as np\r\nimport matplotlib.pyplot as plt\r\n\r\nnan = np.nan\r\ndata = np.array([[nan, 4, nan], [2, 7, 5], [nan, 8, nan]])\r\nlinks = np.array([[nan, 'http://abc.com/', nan],\r\n                  ['http://cnn.com/', 'http://nbc.com/', 'http://cbs.com/'],\r\n                  [nan, 'http://nytimes.com',]])\r\n\r\nfig = plt.figure()\r\nax = plt.gca()\r\nmesh = ax.pcolormesh(data, urls=links)\r\nfig.savefig('/tmp/test_links.svg')\r\n```\r\n\r\n**Actual outcome**\r\n\r\n\u003c!--The output produced by the above code, which may be a screenshot, console output, etc.--\u003e\r\n\r\n```\r\n$ fgrep http /tmp/test_link.svg \r\n  \"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd\"\u003e\r\n\u003c!-- Created with matplotlib (http://matplotlib.org/) --\u003e\r\n\u003csvg height=\"288pt\" version=\"1.1\" viewBox=\"0 0 432 288\" width=\"432pt\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"\u003e\r\n```\r\n\r\n**Expected outcome**\r\n\r\n\u003c!--A description of the expected outcome from the code snippet--\u003e\r\n\u003c!--If this used to work in an earlier version of Matplotlib, please note the version it used to work on--\u003e\r\n\r\nThe URLs are inserted into the quadmesh \u003cg\u003e element like this:\r\n```\r\n\u003cg id=\"QuadMesh_1\"\u003e\r\n  \u003ca xlink:href=\"url\"\u003e \u003cpath\u003e /* the path */ \u003c/path\u003e \u003c/a\u003e\r\n  \u003ca xlink:href=\"url\"\u003e \u003cpath\u003e /* the path */ \u003c/path\u003e \u003c/a\u003e\r\n\u003c/g\u003e\r\n```\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: Linux \r\n  * Matplotlib version: 2.2.2\r\n  * Matplotlib backend (`print(matplotlib.get_backend())`): module://ipykernel.pylab.backend_inline, but SVG is what I care about\r\n  * Python version: 3.5.3\r\n  * Jupyter version (if applicable): 4.4.0\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\nmatplotlib is installed in a virtualenv with pip.","author":{"url":"https://github.com/pingyeh","@type":"Person","name":"pingyeh"},"datePublished":"2018-10-03T21:53:14.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":8},"url":"https://github.com/12392/matplotlib/issues/12392"}