Re: [Groff] Converting basic units to inches in PostScript

[Ted Harding]

Regarding your "72000", this will refer to 72000 "millipoints".
In current standard orthograhy, 1 point is 1/72 of an inch,
amd what I call a "millipoint" is of course 1/1000 of a point.
It is ths standard unit (groff "u") for PostScript output
("devps" output device). So "72000" in \n[.o] denotes a page-offset
of 1 inch in devps.

Other output devices may use different dimensions for "u".
These can be found as "res" (resolution) in the "DESC" file
for the output device'. Thus:
.../font/devps/DESC : "res 72000"
.../font/devascii/DESC : "res 240"
.../font/devdvi/DESC : "res 57816"
and so on (the last, devdvi -- as used by TeX -- can in
the politest terms be described as "inconvenient").

Hoping this helps,
Ted.

On 03-Aug-2016 13:50:41 John Gardner wrote:
> Hey guys,
> 
> Hrm, well, adding the `u` suffix to `.in` *did* change the indentation, but
> it's suddenly too small.
> 
> If you're curious, the code may be found here
> <https://github.com/Alhadis/AddressPrinter>. Be aware this was written
> strictly as a personal challenge; no macros or GNU extensions were used (I
> enjoy flagellating myself with difficult tasks for some reason...). You can
> test its output with `make template && make all`.
> 
> Is there any way to gauge the dimensions of the output from within troff?
> The \n[.o] register is only giving me 72000, which isn't very helpful (I'm
> assuming that's supposed to reflect the page's horizontal dimensions...)
> 
> On 3 August 2016 at 22:14, Ralph Corderoy <address@hidden> wrote:
> 
>> Hi John,
>>
>> Carsten wrote:
>> > If you use .in with a register value you have to set the unit to u,
>> > e.g.:
>> >     .in \n(dlu
>> > else the default unit of .in is multiplied with the dl register value.
>>
>> Also, see the Notes column for .in on page 4 of CSTR 54,
>> http://troff.org/54.pdf, and sections 1.3 and 1.4.
>>
>> Cheers, Ralph.
>>
>>

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E-Mail: (Ted Harding) <address@hidden>
Date: 03-Aug-2016  Time: 15:29:20
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