René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"patches.Arc objects randomly drawing the full ellipse","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\n\u003c!--A short 1-2 sentences that succinctly describes the bug--\u003e\r\n\r\nProviding theta1 and theta2 to the Arc constructor sometimes causes the arc to be drawn as the full ellipse.\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\nfrom matplotlib.patches import Arc\r\nimport matplotlib.pyplot as plt\r\n\r\npatches = [\r\n    Arc((143954140, 374), 476, 476, theta1=0, theta2=180),\r\n    Arc((143954902, 374), 2001, 749, theta1=0, theta2=180),\r\n    Arc((143955137, 374), 2471, 749, theta1=0, theta2=180),\r\n    Arc((143955276, 374), 2748, 749, theta1=0, theta2=180),\r\n    Arc((143955362, 374), 2022, 749, theta1=0, theta2=180),\r\n    Arc((143955500, 374), 2299, 749, theta1=0, theta2=180),\r\n    Arc((143955641, 374), 488, 488, theta1=0, theta2=180),\r\n    Arc((143955650, 374), 506, 506, theta1=0, theta2=180),\r\n    Arc((143955885, 374), 976, 749, theta1=0, theta2=180),\r\n    Arc((143956128, 374), 489, 489, theta1=0, theta2=180),\r\n    Arc((143956135, 374), 467, 467, theta1=0, theta2=180),\r\n    Arc((143956137, 374), 471, 471, theta1=0, theta2=180),\r\n    Arc((143956276, 374), 748, 748, theta1=0, theta2=180),\r\n    Arc((143956515, 374), 1226, 749, theta1=0, theta2=180),\r\n    Arc((143956167, 374), 412, 412, theta1=0, theta2=180),\r\n    Arc((143956170, 374), 402, 402, theta1=0, theta2=180),\r\n    Arc((143956172, 374), 401, 401, theta1=0, theta2=180),\r\n    Arc((143956183, 374), 380, 380, theta1=0, theta2=180),\r\n    Arc((143956321, 374), 657, 657, theta1=0, theta2=180),\r\n    Arc((143956610, 374), 80, 80, theta1=0, theta2=180),\r\n    Arc((143956849, 374), 558, 558, theta1=0, theta2=180),\r\n    Arc((143956928, 374), 400, 400, theta1=0, theta2=180),\r\n    Arc((143956960, 374), 335, 335, theta1=0, theta2=180),\r\n    Arc((143956962, 374), 331, 331, theta1=0, theta2=180),\r\n    Arc((143957055, 374), 146, 146, theta1=0, theta2=180),\r\n    Arc((143957346, 374), 105, 105, theta1=0, theta2=180),\r\n    Arc((143957397, 374), 207, 207, theta1=0, theta2=180),\r\n    Arc((143957448, 374), 308, 308, theta1=0, theta2=180),\r\n    Arc((143957459, 374), 331, 331, theta1=0, theta2=180),\r\n    Arc((143957475, 374), 363, 363, theta1=0, theta2=180),\r\n    Arc((143957696, 374), 804, 749, theta1=0, theta2=180),\r\n    Arc((143958871, 374), 3154, 749, theta1=0, theta2=180),\r\n    Arc((143957954, 374), 287, 287, theta1=0, theta2=180),\r\n    Arc((143957957, 374), 292, 292, theta1=0, theta2=180),\r\n    Arc((143958125, 374), 628, 628, theta1=0, theta2=180),\r\n    Arc((143958305, 374), 268, 268, theta1=0, theta2=180),\r\n    Arc((143958313, 374), 251, 251, theta1=0, theta2=180),\r\n    Arc((143958368, 374), 142, 142, theta1=0, theta2=180),\r\n    Arc((143958369, 374), 136, 136, theta1=0, theta2=180),\r\n    Arc((143958370, 374), 138, 138, theta1=0, theta2=180),\r\n    Arc((143958905, 374), 535, 535, theta1=0, theta2=180),\r\n    Arc((143959528, 374), 1780, 749, theta1=0, theta2=180),\r\n    Arc((143959543, 374), 1810, 749, theta1=0, theta2=180),\r\n    Arc((143959544, 374), 1813, 749, theta1=0, theta2=180),\r\n    Arc((143959849, 374), 1198, 749, theta1=0, theta2=180),\r\n    Arc((143960119, 374), 658, 658, theta1=0, theta2=180),\r\n    Arc((143960678, 374), 151, 151, theta1=0, theta2=180),\r\n    Arc((143960682, 374), 158, 158, theta1=0, theta2=180),\r\n    Arc((143960682, 374), 159, 159, theta1=0, theta2=180),\r\n    Arc((143960723, 374), 241, 241, theta1=0, theta2=180),\r\n    Arc((143960797, 374), 388, 388, theta1=0, theta2=180),\r\n    Arc((143960845, 374), 484, 484, theta1=0, theta2=180),\r\n    Arc((143960809, 374), 363, 363, theta1=0, theta2=180),\r\n    Arc((143960943, 374), 95, 95, theta1=0, theta2=180),\r\n    Arc((143960945, 374), 92, 92, theta1=0, theta2=180)\r\n]\r\n\r\nplt.figure()\r\nax = plt.gca()\r\nmap(ax.add_patch, patches)\r\nplt.xlim(143953697, 143961337)\r\nplt.ylim(-150, 900)\r\nplt.show()\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![image](https://user-images.githubusercontent.com/17572426/32301746-967dedf2-bf35-11e7-8263-102883c3a99a.png)\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\nAll the arcs should be half-ellipses above the line `y = 0.5`.\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: Mac OS Sierra\r\n  * Matplotlib version: 2.1.0\r\n  * Matplotlib backend (`print(matplotlib.get_backend())`): MacOSX\r\n  * Python version: 2.7.14 (Homebrew)\r\n  * Jupyter version (if applicable):\r\n  * Other libraries: numpy 13.3.3\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\npython 2.7.14 from homebrew (`brew install python`); matplotlib from pip (`sudo -H pip install matplotlib`)\r\n","author":{"url":"https://github.com/scnorton","@type":"Person","name":"scnorton"},"datePublished":"2017-11-01T22:55:44.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/9659/matplotlib/issues/9659"}