René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"nbagg blit support","articleBody":"Hi, on the nbagg backend, blit doesn't seem to update without re-drawing. Here's a simple example:\n\n``` python\nimport matplotlib.pyplot as plt\n\nprev_artist = None\ncur_y = 0.1\n\ndef onclick_handle(event):\n  \"\"\"Should draw elevating green line on each mouse click\"\"\"\n  global ax, bg, prev_artist, cur_y\n  ax.figure.canvas.restore_region(bg)\n  if prev_artist:\n    prev_artist.remove()\n  cur_y += 0.1\n  prev_artist = ax.plot([0, 1], [cur_y, cur_y], 'g')[0]\n  ax.draw_artist(prev_artist)\n  ax.figure.canvas.blit(ax.bbox)\n  print \"Drew line\"\n\nax = plt.gca()\nax.plot([0, 1], [0, 1], 'r')\n# ax.figure.canvas.draw()\nbg = ax.figure.canvas.copy_from_bbox(ax.bbox)\nax.figure.canvas.mpl_connect('button_press_event', onclick_handle)\n```\n\nWith `%matplotlib nbagg`, clicking on the plot doesn't cause any updates until the plot is re-drawn. With other backends (say qt) the plot updates immediately on clicking.\n\nAn unrelated oddity, if I uncomment the draw command and try re-drawing the figure just disappears (edit - on 1.4.3; seems fixed on 1.5.1dev1).\n\nIf it helps, IPython version is 2.3.0 and matplotlib is 1.4.3/1.5.1dev1; occurs on both chrome and firefox. [UAT including animation example](http://nbviewer.ipython.org/github/matplotlib/matplotlib/blob/master/lib/matplotlib/backends/web_backend/nbagg_uat.ipynb) more or less run fine.\n\n(Coincidental to the other nbagg animation issue just posted. Google led to [this post also](http://matplotlib.1069221.n5.nabble.com/blit-support-in-webagg-nbagg-backends-td43879.html).)\n","author":{"url":"https://github.com/azjps","@type":"Person","name":"azjps"},"datePublished":"2015-03-27T21:22:16.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":17},"url":"https://github.com/4288/matplotlib/issues/4288"}