[Therion] Joining maps with the join command

[Tarquin Wilton-Jones]

Sorry for dragging a thread in the wrong direction, but ...

> That would indeed be helpful.


If you're looking for a nice example ... this is what happens when you
create a slope with two straight points, then accidentally add a third
point on the same position as the first one:

"
! angle(0,0) is taken as zero.
<for(0)> ...EXPR0)])-angle(thdir((path),(EXPR0))))

mod360;alw_perpendicular:=...

l_slope->...wn.lengths[i]:lengths[i]:=-1;fi;endfor

;ni:=0;pi:=0;for.i=0upto.l...
l.9329 ...(1,51.7368,24.3004),(2,51.7368,24.3004))
                                                  ;
The `angle' between two identical points is undefined.
I'm zeroing this one. Proceed, with fingers crossed.

...

error -- metapost exit code -- 2
"

That one is really not very human readable (though I can at least see it
was a "slope" at fault).


Tarquin