Thanks for the fix - works for me on this afternoon's SVN. -Eric
On Mon, Dec 15, 2008 at 1:27 AM, Eric Firing <efir...@hawaii.edu> wrote: > Eric Bruning wrote: >> >> I think of artists as having visual properties that persist (e.g., >> filled vs. outlined, a colormap with min and max values) even as data >> associated with the artist is changed. In the edge case described >> below, this doesn't seem to hold true. >> >> I have code that animates a scatter plot by sub-selecting the data >> stored in a collection artist. In cases where some frames contain no >> data, the scatter artist's data is temporarily empty. On subsequent >> frames (once there is data again) some of the visual properties my >> filled point becomes an outlined point, as in the code below. >> >> # Filled single point with no outline >> sc = scatter([1],[1],c=[1], edgecolors='none') >> >> # Cache the data >> xy=sc.get_offsets() >> s=sc.get_array() >> >> sel=s<0 >> sc.set_offsets(xy[sel,:]) >> sc.set_array(s[sel]) >> >> # No data, so nothing shown. No problem. >> sc.figure.canvas.draw() >> >> # Now restore the original data >> sc.set_offsets(xy) >> sc.set_array(s) >> >> # Outlined single point with no fill >> sc.figure.canvas.draw() >> sc.get_edgecolors() >> sc.get_facecolors() >> sc.get_array() >> >> The fix probably has to do with Collection.update_scalarmappable. >> When set_array([ ]) happens, >> len(self._facecolors) > 0, therefore >> self._facecolors = to_rgba([ ]), >> When set_array([1]) restores data, >> len(self._facecolors) == 0, therefore >> self._edgecolors = self.to_rgba([1]) >> >> Should is_filled vs. is_stroked be preserved in this case? If so, is >> there a more elegant fix than to add is_filled and is_stroked >> properties that are checked by update_scalarmappable? > > I don't see a better way, so I implemented your suggestion. > > Eric > ------------------------------------------------------------------------------ SF.Net email is Sponsored by MIX09, March 18-20, 2009 in Las Vegas, Nevada. The future of the web can't happen without you. Join us at MIX09 to help pave the way to the Next Web now. Learn more and register at http://ad.doubleclick.net/clk;208669438;13503038;i?http://2009.visitmix.com/ _______________________________________________ Matplotlib-devel mailing list Matplotlib-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-devel
