On Tue, Feb 2, 2010 at 7:47 AM, Luc Gervais <luc.g...@gmail.com> wrote:
> Hello all,
>
> I am creating radar plots in matplolib and I cannot get transparent polygons.
>
> I have run the examples from the gallery:
> http://matplotlib.sourceforge.net/examples/api/radar_chart.html
> http://matplotlib.sourceforge.net/examples/pylab_examples/polar_bar.html
>
> The colours show differently on my computer and the polygons are opaque. I 
> have changed
> ax.set_alpha(0-1)
> ax.fill(theta, d, facecolor=color, alpha=0-1)
> plt.Polygon(verts, closed=True, edgecolor='k', alpha=0-1)

You are writing "0-1" which is -1 which is not a valid alpha value.
This should probably raise an exception, but apparently it doesn't.
Valid alphas are in the range 0 to 1 Try 0.1 rather than 0-1.  Note
alpha is not supported in postscript output, but does work in raster
displays, PNG, PDF and SVG.

JDH

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