[metapost] reverse clip operation

[Andreas Matthias]

lfinsto1 at gwdg.de wrote:

> The point I'm trying to make involves a distinction between placing items
> onto a `picture' and drawing, i.e., placing items onto `currentpicture'
> for output in a figure. 

[...]

> It seems to me that you could get the result you want by creating your
> pictures without putting them onto `currentpicture', calculating your
> points, drawing your lines, and then adding your pictures to
> `currentpicture'.

Yes, I think I have to reconsider my design. I'll keep on pondering.
Thanks.

Ciao
Andreas