[metapost] Color of a point

[Boguslaw Jackowski]

Luigi Scarso:
> Sorry, again .
> Maybe a silly question:
> given a point, how can I know the background color of this point ?

Taco Hoekwater:
> All in all: not simple at all.

Would be much easier if we could operate on bitmaps in METAPOST
(yes, yes, it's my olden golden dream ;-) -- then, at least within
some accuracy, we might have check the colour of a given point...

Note that checking whether two B\'zier intersect, or are tangent, or
are just very close to each other is not at all robust operations anyway.

Cheers -- Jacko

-- 
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  Bogus\l{}aw Jackowski: B_Jackowski at GUST.ORG.PL
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