Re: MetaPost/Fun question

[Hans Hagen <pragma@wxs.nl>]

At 09:59 PM 3/22/2003 +0100, you wrote:
>Hello,
>
>I would like to know if it is possible in MetaPost (in particular
>MetaFun) to get all the possible intersection points of the paths,
>with some kind of simple command, with a syntax like, say:
>
>A[] := path1 intersections path2
>
>(where the resulting list could be either a list of points or a
>list of time pairs, like for intersectiontimes).
>
>Another possible syntax could be
>
>path3 := path1 intersections path2
>
>which would give a path for which times 0, 1, 2, 3, ... give the
>first, second, third, fourth, ... intersection point.
>
>Anything like this?

not that i know, but assuming that those path have some distance, i can 
imagine dividing a path in parts and determining the intersectionpoints iof 
the pieces;

delta := .25 ;

for i=0 step delta upto length(p)-delta :
   if intersection_found(1,subpath(i,i+.1) of p) :
     store point
   fi ;
endfor ;

.....


Hans
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                                   Hans Hagen | PRAGMA ADE | pragma@wxs.nl
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