On 11/14/2021 4:33 AM, Aditya Mahajan via ntg-context wrote:
Hi,
There is a bug in lmt_arrow. If given a "non-cycle" path, lmt_arrow completes
the cycle.
\starttext
\startMPcode
newpath p;
ahfactor := 5;
p := origin .. (1cm, 1cm) .. (2cm, 0);
draw lmt_arrow
[
path = p,
location = "percentage",
percentage = 50,
alternative = "curved",
]
withpen pencircle scaled 1bp;
\stopMPcode
\stoptext
With 2021.11.11, I get the attached file. Note that lmt_arrow has drawn the
"cycle" version of the path, even though p does not have a cycle.
I have looked at the code and cannot figure out why this is happening.
it happens in the 'direct' variant (metapost.registerdirect) where a
boolean is passed as signal and that boolean then is also picked up by
the (shared) path injector as (old school) signal that a path is closed
while it should instead consutl the closed field in a path table (sounds
more complex than it is)
so in the end it is a nasty side effect of the fast inject code path
(shared function with different stack values; i'll probably have to
ditch a "low level backward compatibility feature no one uses anyway"
some day)
i uploaded a fix that you can test when the bins are compiled at
https://build.contextgarden.net/#/waterfall?tags=c.luametatex
new bins then in:
https://dl.contextgarden.net/build/luametatex/
(fyi: in the mp code you see that the path p is 'get' from the lua end
where it got passed to by parameter)
(interesting that it didn't show up sooner, maybe most users have closed
paths and/or most lmt_ features used closed paths)
Hans
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Hans Hagen | PRAGMA ADE
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