René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"BUG: clabel manual mode doesn't make a gap big enough in contour","articleBody":"### Bug report\r\n\r\n**Bug summary**\r\n\r\nUsing ``plt.clabel(manual=True)`` adds labels but the labels are not easily readable because only a small gap is created in the contour.\r\n\r\n**Code for reproduction**\r\n\r\nThe following works:\r\n\r\n```python\r\nplt.figure()\r\nx = np.arange(400).reshape((20,20))\r\nc = plt.contour(x)\r\nplt.clabel(c)\r\n```\r\n\r\n\u003cimg width=\"752\" alt=\"screen shot 2017-06-29 at 09 59 25\" src=\"https://user-images.githubusercontent.com/314716/27677788-242a8664-5cb3-11e7-8231-03b00d006672.png\"\u003e\r\n\r\nBut the following doesn't give as nice a result:\r\n\r\n```python\r\nplt.figure()\r\nx = np.arange(400).reshape((20,20))\r\nc = plt.contour(x)\r\nplt.clabel(c, manual=True)\r\n# click around\r\n```\r\n\r\n\u003cimg width=\"752\" alt=\"screen shot 2017-06-29 at 09 59 29\" src=\"https://user-images.githubusercontent.com/314716/27677808-3740dc6c-5cb3-11e7-9eab-0268dce8a443.png\"\u003e\r\n\r\nThis happens with both the Qt5 and MacOS X backends, and I am using a retina display.\r\n\r\n**Matplotlib version**\r\n\r\n  * Operating System: MacOS X 10.11\r\n  * Matplotlib Version: 2.0.2\r\n  * Python Version: 3.6.1\r\n","author":{"url":"https://github.com/astrofrog","@type":"Person","name":"astrofrog"},"datePublished":"2017-06-29T08:12:20.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":10},"url":"https://github.com/8819/matplotlib/issues/8819"}