[metapost] Another Question

Walt Burkhard burkhard at cs.ucsd.edu
Sun May 7 21:57:45 CEST 2017

Hello All,

I have a metapost program that begins as below ---

mpost -numbersystem=double displayMP.mp
This is MetaPost, version 1.9991 (TeX Live 2016) (kpathsea version 6.2.2)
Preloading the plain mem file, version 1.005) ) (./displayMP.mp (./SCHEMA0)
data file: fourObjects
>> left
>> pen
! Not implemented: penoffset(unknown numeric)of(pen).
<to be read again>

<to be read again>

l.702 ^^IdrawVisible
The mpLineWidth variable is properly set before the pickup pencircle
statement is interpreted.

Then if an r is typed ...  I end up with the following ...

! Internal quantity `pen_bot' must receive a known numeric value.
<to be read again>
<to be read again>

l.722 ^^IdrawVisible
[4] )
(see the transcript file for additional information)
4 output files written: fourObjects.1 .. fourObjects.4
Transcript written on displayMP.log.

But now if I use the four files   fourObjects.1 ... fourObjects.4  the line
width drawn is what I asked for.

Why is there all these extra statements by metapost?   I  do not have a
small example of this behavior.

Many thanks in advance for your comments.
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