Hi Jon, I'm sorry I didn't mean 0-1. I meant from 0 to 1. I have tried with 
values like 0.15, 0.55, 0.95 and 1. The polygons stay opaque with the same 
colour in all cases.

Luc


On 2010-02-02, at 2:59 PM, John Hunter wrote:

> 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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