[Matplotlib-users] duplicating a line object

Benjamin Root ben.v.root at gmail.com
Fri Oct 16 10:37:36 EDT 2015

Traitlets might be the solution here. You set up your proxy artist to have
properties that are linked to the properties of the plot object. When one
is updated, the other gets updated as well. The automatic linking of plot
objects to legend proxy artists is is one of the many benefits that would
come about with the future inclusion of traitlets in matplotlib. However, I
don't think you need to wait for us to get that aspect working. Since you
are already creating proxy artists, I think it shouldn't be that much more
effort to link their properties together with traitlets.

Unfortunately, the documentation is fairly sparse, and examples are minimal
as well. I know there was some decent examples during the SciPy tutorials,
but I can't seem to find it at the moment...

Ben Root

On Fri, Oct 16, 2015 at 10:10 AM, Slavin, Jonathan <jslavin at cfa.harvard.edu>

> Hi,
> I have a plot on which I want to plot many points as open circles.  I also
> want to include a legend.  The problem is that while a thin marker edge
> width works very nicely for the plot, it is difficult to see in the
> legend.  My solution, which does work, is to define Line2D objects as proxy
> artists and keep all the attributes the same except the mew, which I
> increase.  However, this seems error prone: if one changes attributes of
> the line, then one has to also make those same changes to the proxy artist
> line.  I thought a better solution was to create the proxy artist as a
> duplicate (copy) of the line and then change the mew via line.set_mew(n).
> However, I haven't been able to figure out how to duplicate a Line2D
> object.  I tried copy and deepcopy from the python builtin copy module, but
> those didn't work.  Any help on this (including alternative ways of
> approaching the problem) would be appreciated.
> Thanks,
> Jon
> --
> ________________________________________________________
> Jonathan D. Slavin                 Harvard-Smithsonian CfA
> jslavin at cfa.harvard.edu       60 Garden Street, MS 83
> phone: (617) 496-7981       Cambridge, MA 02138-1516
> cell: (781) 363-0035             USA
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