mpost: cutbefore/cutafter

[Marc van Dongen <dongen@cs.ucc.ie>]

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Dear metapost gurus,

There is something I don't understand about
cutbefore and cutafter. Maybe what I need is
in the metafont book which I don't have yet.

Anyway, here it goes.

Is there any way to tell mpost to cut a curve
exactly at the bpath of a boxed thingy? At the
moment I am facing the problem that for example
a cutafter of an arc goes slightly beyond (what
seems to be) the inner boundary of the bpath of
a circle.

I have attached a picture which demonstrates the
effect. In this picture the phenomenon manifests
itself with the first three circles at the bottom.
The arcs were drawn with a command that drew them
from the centres of the circles cutbefore and
cutafter the bpaths of the circles.

Ideally I would like to have control where to cut
the arcs. For example, it would be very nice if
it were possible to cut exactly at the outside of
where a circle is draw or to cut it exactly at
the inside of where a circle is drawn. Is there
any way to do this?

Any pointers/help would be greatly appreciated.

Regards,

Marc van Dongen
-- 
     Marc van Dongen, CS Dept | phone:  +353 21 4903578
University College Cork, NUIC | Fax:    +353 21 4903113
  College Road, Cork, Ireland | Email: dongen@cs.ucc.ie

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