On Sat, Jul 14, 2012 at 11:48 AM, John Hunter <email@example.com>
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
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?