> Apart from implementing this natively in matplotlib, I was thinking if
> I could work around this limitation for our purposes in the following
> way: My objects to draw will always sit in a Collection. I could derive
> my own Collection class with a draw() method that changes the
> linewidth of the collections, taking into account the current
> axes.transData and figure.dpi. Using that I should be able to
> achieve my goal, right? (given that I restrict myself to plots with
> the same scaling in all directions)
>
>
Not to plug one of my own answers, but there's an example of using a
callback to keep linewidths in data coordinates here:
http://stackoverflow.com/a/15673254/325565
Have a look at the second example in the answer for the callback approach.
Using something like ``shapely`` to buffer your lines as the first example
does is also an option.
Hope that helps a bit anyway,
-Joe
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