René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Popover over plot is very slow","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\nGtk3 overlay widgets like popover is very slow when they placed over plot.\r\n\r\n\r\n**Code for reproduction**\r\n\r\n```python\r\nimport gi  # isort:skip\r\ngi.require_version('Gtk', '3.0')  # NOQA: E402\r\nfrom gi.repository import Gtk  # isort:skip\r\n\r\nimport numpy as np\r\nfrom matplotlib.backends.backend_gtk3agg import \\\r\n    FigureCanvasGTK3Agg as FigureCanvas\r\nfrom matplotlib.figure import Figure\r\n\r\nwin = Gtk.Window()\r\n\r\nbox = Gtk.Box(orientation=Gtk.Orientation.VERTICAL)\r\nbutton = Gtk.Button(label='Push me')\r\nbox.pack_start(button, False, True, 0)\r\n\r\npopover = Gtk.Popover(relative_to=button)\r\npopbox = Gtk.Box(orientation=Gtk.Orientation.VERTICAL)\r\npixbuf = Gtk.IconTheme.get_default().load_icon('gtk-about', 256, 0)\r\nicon = Gtk.Image.new_from_pixbuf(pixbuf)\r\npopbox.pack_start(icon, False, True, 0)\r\nlabel = Gtk.Label('Popover should be slow')\r\npopbox.pack_start(label, False, True, 0)\r\npopover.add(popbox)\r\npopbox.show_all()\r\npopbox.set_margin_top(16)\r\npopbox.set_margin_bottom(16)\r\npopbox.set_margin_left(16)\r\npopbox.set_margin_right(16)\r\nbutton.connect('clicked', lambda w: popover.popup())\r\n\r\nfig = Figure()\r\nax = fig.add_subplot(111)\r\ncanvas = FigureCanvas(fig)\r\ncanvas.set_size_request(640, 489)\r\nbox.pack_start(canvas, True, True, 0)\r\n\r\narr = np.random.random((2, 2000, 2000))\r\nax.scatter(arr[0][0], arr[0][1], arr[1].flatten() * 40)\r\n\r\nwin.add(box)\r\nwin.connect('destroy', Gtk.main_quit)\r\nwin.show_all()\r\nGtk.main()\r\n```\r\n\r\n**Actual outcome**\r\n\r\nClick to ``\"push me\"`` button to show popover, animation will be slow.\r\ncProfile shows that most of time python spends in redrawing entire plot during animation.\r\n\r\n```\r\n   ncalls  tottime  percall  cumtime  percall filename:lineno(function)                                                                      \r\n       43   30.353    0.706   30.359    0.706 collections.py:883(set_sizes)                                                                  \r\n        1   11.329   11.329   50.730   50.730 Gtk.py:1608(main)                                                                              \r\n       42    4.675    0.111    5.254    0.125 {method 'draw_path_collection' of 'matplotlib.backends._backend_agg.RendererAgg' objects}      \r\n        1    0.245    0.245    0.245    0.245 {method 'random_sample' of 'mtrand.RandomState' objects}                                       \r\n    90130    0.155    0.000    0.155    0.000 path.py:208(vertices)                                                                          \r\n    87356    0.155    0.000    0.155    0.000 path.py:241(simplify_threshold)                                                                \r\n35583/26326    0.155    0.000    0.295    0.000 artist.py:230(stale)                                                                         \r\n    88197    0.150    0.000    0.150    0.000 path.py:222(codes)                                                                             \r\n    88616    0.145    0.000    0.145    0.000 path.py:260(should_simplify)     \r\n```\r\n\r\n**Expected outcome**\r\n\r\nPlot should be cached somehow and won't be redrawn in this case.\r\n\r\n**Matplotlib version**\r\n\r\n\u003c!--Please specify your platform and versions of the relevant libraries you are using:--\u003e\r\n  * Operating system: Debian Sid\r\n  * Matplotlib version: 2.2.3\r\n  * Matplotlib backend: Gtk3Agg and Gtk3Cairo\r\n  * Python version: 3.6.6\r\n  * Gtk: 3.22,30\r\n\r\nMatplotlib installed in virtual environment with pip.\r\n\r\n\r\nI would like to fix this issue and make PR. Please point me any direction how this problem can be fixed.\r\n","author":{"url":"https://github.com/akhilman","@type":"Person","name":"akhilman"},"datePublished":"2018-09-04T00:17:11.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":5},"url":"https://github.com/12010/matplotlib/issues/12010"}