Follow-up Comment #2, bug #67866 (group groff):
Doug replied via email. Here's the body of his message.
I only had only splines in mind for the bounding box idea, I would
place the "compass points" on the bounding box of the control points,
pic says .c lies halfway between .start and .end.
Compass points for text objects are already defined as being on the
bounding box, except the "bounding box" is defined by variables
textwid and textht, not(!) by the text content.
You suggest that for some figures, in particular circles, the compass
points would be on the intersection of the figure and rays from
somewhere (.c?) to the corners and mid-edges of the bounding box. For
ellipses that would be the same as what I called flattening or
squashing.
If version 24 has polygons, the bounding box idea might be pertinent there.
Alternatively they could lie on the edges of supporting compass half-spaces.
The existence of corners is visible in the syntax, but the meaning is not.
Doug
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