Re: [matplotlib-devel] Wind Barbs Full Patch

[Michael D. <md...@st...>]

Ryan May wrote:
> 5) I added an empty circle marker for low wind speeds (vector 
> magnitudes).  Accomplishing having the unfilled circle while having 
> the barbs filled involved a bit of a "elegant hack".  Using the set of 
> vertices that draws the CirclePolygon, I add an additional copy of 
> these vertices, basically drawing the circle back the other way.  This 
> is basically tricking the drawing algorithm into drawing a really thin 
> annulus with a very small gap, but it works perfectly as far as I can 
> tell.  It's also somewhat consistent with the way the lines on the 
> barb are drawn.  It is *far* simpler than any other solution, which 
> would have required somehow mapping a color to each polygon *before* 
> calling
> draw_path_collection().  None of the backends I test had a problem, 
> including PS, PDF, and SVG (tested with Evince, Firefox, and Acroread).
Having replied before reading all my e-mail, I see you arrived at a 
similar solution to the one I suggested.  Great to hear that it worked. 

Cheers,
Mike