Hi Bjarni, At 2023-06-13T16:53:50+0000, Bjarni Ingi Gislason wrote: > How does \D't ...' influence the height of the text baseline as it > is just changing the "graphic pen" and moving it horizontally (in > the air) to its next position?
I don't think the \D't' command has any impact on vertical positioning. Consider the following input. .nf \D't 1p'\[ru]A \D't 2p'\[ru]A \D't 4p'\[ru]A \D't 12p'\[ru]A I'm attaching the "grout" output "groff -Tps -Z", but one can see from the "V" commands that the "A" glyphs are regularly spaced vertically, at multiples of 12,000 basic units, which is consistent with an invariant 12 point vertical spacing. > The general interpretation of \D'c x' is to do 'c' and end at > position x from the starting point. Yes. When one is changing the fill color with \D'F', how should the drawing position be updated? (One answer is: "don't use the \D'F' drawing command; that's what \M is for". But, I would ask that people humor me and answer the question anyway, since \D'F' is documented in groff 1.22.4 and earlier versions.) > How does "tbl" handle its lines' thickness? Good question! It draws lines with the \D'l' drawing command, which is not a surprise. It manages their thickness by storing the type size in a register. The "linesize" region option overrides this size. It then changes the type size, using that register, before drawing a line, then restores it afterward. For other reasons, I suspect GNU tbl to have been one of the first pieces of groff that Clark wrote. If I'm right, that might explain why it uses this method instead of groff's \D't' extension. If we change \D't' to stop implying motion, we could simplify the groff input that tbl generates in this respect. Regards, Branden
x T ps x res 72000 1 1 x init p1 V12000 H72000 md DFd s10000 Dt 1000 0 Dl 5000 0 x font 5 TR f5 tA n12000 0 V24000 H72000 Dt 2000 0 Dl 5000 0 tA n12000 0 V36000 H72000 Dt 4000 0 Dl 5000 0 tA n12000 0 V48000 H72000 Dt 12000 0 Dl 5000 0 tA n12000 0 x trailer V792000 x stop
.TS box; L. foo .TE .sp .TS box linesize(5); L. foo .TE
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