Hi Mike, Thanks for the suggestion - however, this doesn't change the FPS. From my experiments so far, it seems using draw_artist would be the best bet, but any ideas why it doesn't work with the MacOS X backend?
https://github.com/matplotlib/matplotlib/issues/166 Cheers, Tom On 24 June 2013 16:13, Michael Droettboom <md...@stsci.edu> wrote: > Have you tried using "draw_idle"? That will schedule the draw for the > next time the event loop is idle. > > Mike > > On 06/24/2013 07:39 AM, Thomas Robitaille wrote: >> Hi everyone, >> >> The following shows an example of a simple data viewer which includes >> a slider, a bitmap, and a scatter plot: >> >> """ >> import numpy as np >> from matplotlib import pyplot as plt >> from matplotlib.widgets import Slider >> >> fig = plt.figure() >> >> ax1 = fig.add_axes([0.1, 0.1, 0.4, 0.7]) >> image = ax1.imshow(np.random.random((512, 512)), vmin=0., vmax=1.) >> >> ax2 = fig.add_axes([0.1, 0.9, 0.85, 0.05]) >> ax2.set_xticklabels("") >> ax2.set_yticklabels("") >> slider = Slider(ax2, "", 0., 1.) >> >> def update_vmax(value): >> image.set_clim(0., value) >> fig.canvas.draw() >> >> slider.on_changed(update_vmax) >> >> ax3 = fig.add_axes([0.55, 0.1, 0.4, 0.7]) >> x = np.random.random(10000) >> y = np.random.random(10000) >> ax3.scatter(x, y) >> >> plt.show() >> """ >> >> When moving the slider, the vmax of the image changes, but I get very >> slow frame rates (~2/sec) on my computer with the MacOS X backend. I >> was wondering whether people here have any tips on speeding things up? >> >> As far as I can figure out, this is slow because both the slider and >> the callback function call ``fig.canvas.draw``. Slider calls it before >> the callback function, so I definitely need to draw things in that >> function, but I can get a factor of 2x speedup by doing >> >> slider.drawon = False >> >> which prevents ``canvas.draw()`` being called twice. However, this is >> still much too slow, so I started to look into using ``draw_artist`` >> to only update elements that need updating, but this requires >> partially re-implementing the Slider class. >> >> As a side note, using ``draw_artist`` also does not work on the MacOS X >> backend: >> >> https://github.com/matplotlib/matplotlib/issues/166 >> >> but I'm willing to have a solution that wouldn't work on this backend >> if it was the only way. >> >> Does anyone have a clean solution to increasing the frame rate of this >> example? >> >> Thanks! >> Tom >> >> ------------------------------------------------------------------------------ >> This SF.net email is sponsored by Windows: >> >> Build for Windows Store. >> >> http://p.sf.net/sfu/windows-dev2dev >> _______________________________________________ >> Matplotlib-users mailing list >> Matplotlib-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/matplotlib-users > > > ------------------------------------------------------------------------------ > This SF.net email is sponsored by Windows: > > Build for Windows Store. > > http://p.sf.net/sfu/windows-dev2dev > _______________________________________________ > Matplotlib-users mailing list > Matplotlib-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/matplotlib-users ------------------------------------------------------------------------------ This SF.net email is sponsored by Windows: Build for Windows Store. http://p.sf.net/sfu/windows-dev2dev _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
