Re: [Matplotlib-users] path effects question

[John H. <jd...@gm...>]

On Sat, Jul 14, 2012 at 11:48 AM, John Hunter <jd...@gm...> wrote:

> I do not understand why in the following example, if I set
> patch_alpha=1.0, I do not see the shadow effect.  I would expect to see it
> for the the rightmost four bars, where the original bars do not entirely
> occlude the shadow, so even if alpha is 1.0, there are parts of the shadow
> that are not behind the original bars and should still be visible.
>
>
>

I now see that this line explains the behavior

https://github.com/matplotlib/matplotlib/blob/master/lib/matplotlib/patheffects.py#L183

 gc0.set_alpha(1.-self._patch_alpha)

so maybe I should amend my question: is this desirable that the shadow
alpha is 1-patch_alpha, since an alpha of 1 on the patch does not imply
that there is no visible shadow?