I committed the original example into the svn, and I admit that I was
not careful with the code. I agree that the arguments should be float
(the doc does say that set_alpha takes float).
The example is now updated to use floats (svn r7300).
Regards,
-JJ
On Mon, Jul 27, 2009 at 9:15 AM, Michiel de Hoon<mjldeh...@yahoo.com> wrote:
>
> Hi everybody,
>
> Should the set_alpha method of a graphics context accept a string (instead of
> a number) as an argument? Currently, some backends (agg, ps, pdf) accept
> strings such as "0.2", whereas others (svg, cairo, Mac OS X) do not. Usually
> that is not a problem, since in almost all cases set_alpha is called with a
> number as the argument. However, the example axes_zoom_effect.py, which was
> recently added to examples/pylab_examples, has these lines:
>
> prop_patches["alpha"]="0.2"
>
> which causes a call to gc.set_alpha of the form gc.set_alpha("0.2"). Backends
> that do not allow strings choke on that.
>
> Whereas in general it may perhaps be useful to allow such strings, it adds
> complexity to the code, and I don't see a good use case for it.
>
> --Michiel.
>
>
>
>
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