> > A. \[-+]: The minus-plus. We should be able to dynamically generate > > this from \[+-] by reflecting the latter about a horizontal axis. If > > the glyph is flipped within its bounding box, I guess the result > > would need to be vertically shifted to align it on the baseline. > > This needs a lot of work but might get you started. > > \s+1\fB+\h'-0.55m'\v'-0.30v'\-\v'+0.30v'\fP\s-1
That would be my ansatz as well: simply assemble the glyph in groff itself. Note also that some fonts have a weirdly squished plus-minus sign, which is ugly. Building it from a real plus sign and a real minus sign ensures consistency in the shapes. Here's my solution for Times + Symbol that I came up with some time ago: .\" eqn .\" ---------------------------------------------------------------- .sp 3c .ps 72 .vs 74 .fp 1 R Times-Roman .fp 2 I Times-Italic .fp 3 S Symbol .char \(pm \v'-0.11m'\Z'+'\v'0.34m'\-\v'-0.23m' .char \(mp \v'-0.23m'\Z'\-'\v'0.34m'+\v'-0.11m' .gcolor red .EQ a +- b .EN .sp -1 .gcolor .EQ define pm % type binary font S \(pm % a pm b .EN .br .EQ define mp % type binary font S \(mp % a mp b .EN
