Pierre GM wrote: > > On Jun 23, 2009, at 8:27 AM, Jeff Whitaker wrote: >> >> Pierre: The reason I did it that way was so that the basemap >> instance could be created independent of any axes instances. For >> instance, you can create a basemap instance before an axes instance >> is created, or you read in a basemap instance from a pickle. If a >> axes instance is associated with a Basemap instance, you can't save >> it in a pickle. > > I understand that, I use pickled basemaps all the time. It's a great > feature, by the way, thanks a lot. > >> If I understand you correctly, you are suggesting that when the >> basemap instance is created, the "ax" attribute be set to plt.gca() >> if no axes instance is passed in through the kwarg, instead of just >> setting it to None. >> In that case, an axes instance will be created and assigned to the >> Basemap instance if one doesn't already exist. > > That's the gist of it, yes. My point is that as soon something is > drawn, the basemap should be linked to an Axes instance. The link > could be overwritten later. > >> I guess I don't see any compelling reason for that, since you can >> always assign an axes instance to the Basemap instance later (via >> "map.ax = plt.gca()". >> I'd rather have this done explicitly by the user, than have it >> happen automatically, with potentially surprising results. > > Well, talking about surprising results, the experience I was relating > in the original message: I load a basemap from a pickle, plot some > contours on it (therefore, a new Axes is created), add a colorbar (a > second Axes is created) and then draw a mapscale. I expect the > mapscale to be drawn on the axes associated with the basemap, because > I'm using one of the basemap's methods to plot the mapscale. With the > current implementation, the scale gets drawn on the colorbar. > > So yes, I could explicitly link the basemap to the first Axes myself. > I still think my suggestion would be far less confusing, but I won't > lose sleep over it. In any case, I think the snippet I put in the > latest message could simplify the code (just drop the line setting > self.ax to ax)... > > > > > > Pierre: Doing what you suggest (having Basemap.__init__ automatically set self.ax to the current axes) will break pickling, so I can't do that. I think the next best thing is just to set it manually. I know the colorbar behavior is annoying, but I think it's just something you have to live with if you use the pylab interface.
-Jeff -- Jeffrey S. Whitaker Phone : (303)497-6313 Meteorologist FAX : (303)497-6449 NOAA/OAR/PSD R/PSD1 Email : jeffrey.s.whita...@noaa.gov 325 Broadway Office : Skaggs Research Cntr 1D-113 Boulder, CO, USA 80303-3328 Web : http://tinyurl.com/5telg ------------------------------------------------------------------------------ _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
