[MetaPost] How to fill a closed path with a hatching?

Hello,

i hope this is the right place to ask but according to what i have read
MetaPost question are "allowed" here too :-)

I have a closed path between two paths which was build with the
'buildcycle' command and which i can fill with color using 'fill' etc...
But now i want to use a easy hatching to fill this path, just vertical
lines would be perfect at the moment. I found the 'mpattern' package but
it looks a bit overscaled for my purpose and i was asking myself if
there is a easier way to do it.

What do the professionals suggest?

Regards from Germany,
Martin

--=20
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