On 8/10/2017 2:07 PM, Schmitz Thomas A. wrote:
Hi all,
this one is for all the metapos/metafun experts out there (Alan, are you
there?). For a counter in one of my slide backgrounds, I have to calculate an
intersectionpoint, given in percentage of the difference between current page
and last page. I have always had some difficulties on the first run, when the
value of the last page isn’t known yet and hence not written to the tuc file,
but the error
! The paths don't intersect.
<to be read again>
used to disappear in subsequent runs. Now, ConTeXt doesn’t compile the file at
all and stops on this error. There is an error message I haven’t seen before:
intersectionpoint->...The paths don't intersect");
origin.else:0.5[point.x_.o...
<to be read again>
;
<*> ... ;z13 = (z11 -- z12) intersectionpoint qw ;
draw z13 withcolor (0.1,0....
This error message was generated by an `errmessage'
command, so I can't give any explicit help.
Pretend that you're Miss Marple: Examine all clues,
and deduce the truth by inspired guesses.
Is there a way to make this conditional, such as (pseudocode)
p intersection_point q
(also sets intersection_found)
if q intersects p:
z = q intersectionpoint p ;
else:
z = (0,0) ;
fi ;
I hope that this would allow ConTeXt to proceed and calculate the point
correctly on the second run.
Thanks, and all best
Thomas
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