Hello!
TikZ provides very nice looking "circular drop shadow". Unfortunately,
it's only looks nice with circular nodes. However, it seems to be a
common demand to be able to use a shadow with fuzzy edges for other
node shapes, for example rectangular frames.
Here is one implementation of shadows for rectangular boxes featuring
real transparency and fuzziness:
http://www.texample.net/tikz/examples/transparent-shadows/I've implemented a slightly more general thing, which:
1) features real transparency and fuzziness,
2) plays nicely with convex polygons, not only rectangular boxes,
3) for user, is very similar to other shadows from TikZ library (does
not require special syntax).
However, I've faced the following problems (I'm not a TeX-ninja):
1) I have not found a way to add several preactions ("pretty drop
shadow layers" in my case) in a loop (\foreach).
2) I wanted to use existing options shadow xshift/shadow yshift, but
didn't succeed with evaluating veclen (I need to pass it to my
decoration; now I'm just passing shadow shift directly).
I'd be happy if my contribution is included in TikZ.
Your help appreciated,
Andrey Paramonov
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tikzlibraryprettyshadow.code.tex (4K) 