[bug #63119] [pic] arc chop fails to chop

[G. Branden Robinson]

URL:
  <https://savannah.gnu.org/bugs/?63119>

                 Summary: [pic] arc chop fails to chop
                 Project: GNU troff
               Submitter: gbranden
               Submitted: Wed 28 Sep 2022 01:27:24 AM UTC
                Category: Preprocessor pic
                Severity: 3 - Normal
              Item Group: Incorrect behaviour
                  Status: Confirmed
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None


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Follow-up Comments:


-------------------------------------------------------
Date: Wed 28 Sep 2022 01:27:24 AM UTC By: G. Branden Robinson <gbranden>
Romina Czyborra reported to the Debian Project
<https://bugs.debian.org/988669>:


$ groff -p -ms -P -bg -P red -X <<.
.PS
SW: circle "SW"
S:  circle "S"  at SW+(2,0)
SE: circle "SE" at SW+(4,0)
N:  circle "N"  at SW+(2,3.464)
NW: circle "NW" at SW+(1,1.732)
NE: circle "NE" at SW+(3,1.732)
C:  circle "C"  at SW+(2,1.155)
arc chop -> radius 1.155 cw from NW to NE
arc chop -> radius 1.155 cw from NE to S
arc chop -> radius 1.155 cw from S to NW
line chop -> from C to S
.PE
.

has gpic's line beautifully chop outside of the circles but not arc!

My educated guess would be that 2020's gpic is simply lacking code to
calculate the circles' intersection points.








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