Tony wrote a nice summary of the various coordinate system used in MPL, but it seems that it didn't make into the official documentation yet. Here is the link. This will give you some idea about the MPL's coordinate system.
http://article.gmane.org/gmane.comp.python.matplotlib.general/14008 -JJ On Wed, Mar 25, 2009 at 9:06 PM, Jae-Joon Lee <lee.j.j...@gmail.com> wrote: > As I said in my previous email, the _loc attribute of the legend need > to be in the normalized axes coordinate, i.e., the lower left corner > of the axes being (0,0) and the upper-right corner being (1,1). Thus, > it needs to be something like below. > > loc_in_canvas = self.legend_x + mouse_diff_x, self.legend_y + mouse_diff_y > loc_in_norm_axes = > self.legend.transAxes.inverted().transform_point(loc_in_canvas) > self.legend._loc = loc_in_norm_axes > > Note that it assumes that the parent of the legend is an Axes > instance, which I think is your case. > IHTH, > > -JJ > > > On Wed, Mar 25, 2009 at 8:26 PM, C M <cmpyt...@gmail.com> wrote: >> Ok, getting there. When I print the various coordinates to stdout, it >> SHOULD be working, but my legend is simply disappearing. This >> is the stdout on one pixel move with the mouse in the x: >> >> mouse x position at pick time 489 >> mouse y position at pick time 349.0 >> Legend x position at pick time = 445.878125 >> Legend y position at pick time= 339.8 >> motion_event.x = 488 >> motion_event.y = 349.0 >> mouse moved x = 1 >> mouse moved y = 0.0 >> new legend location on move = (446.87812499999995, 339.80000000000001) >> release >> >> But what instead happens is the legend poofs out of existence. >> >> At the end of the motion event, I am calling this: >> >> self.canvas.draw() >> self.parent.Refresh() >> >> And wonder if I should be using some other way to redraw the legend? >> Is it just not being redrawn this way? I thought I should use self.draw(), >> which is a method in my class which draws the line and the legend, >> but using that does nothing at all. >> >> Very stuck here. Any help appreciated. >> C >> >> ------------------------------------------------------------------------------ >> _______________________________________________ >> Matplotlib-users mailing list >> Matplotlib-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/matplotlib-users >> > ------------------------------------------------------------------------------ _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
