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.
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