On 20-Aug-10 08:30:33, Andre Majorel wrote:
> On 2010-08-20 09:37 +0200, Werner LEMBERG wrote:
>>
>> > I'd like to include a simple diagram in a man page, something
>> > like this :
>> >
>> > _____ _____ _____
>> > | | A | | C | |
>> > | X |---->| Y |----->| Z |
>> > | |<----| |<-----| |
>> > |_____| B |_____| D |_____|
>> >
>> > I suppose I could use tbl or switch to a fixed-spacing font and
>> > use .nf. What would you recommend ?
>>
>> The advantage of tbl is that you get a real graphics with non-TTy
>> output devices.
>
> But for the boxes, not for the arrows, if I'm not mistaken.
>
>> > It must work both in print and in a terminal and not depend on
>> > Groff.
>>
>> `Must not depend on groff'? What does this mean?
>
> Simply that it must work with any nroff & troff, not just Groff.
> --
> André Majorel http://www.teaser.fr/~amajorel/
I almost never have occasion to use groff for "terminal" ouput,
so was not aware of the apparent problems I note below.
First, however, the following will produce terminal output
similar to what André wants -- EXCEPT that I cannot get it to
put ">" or "<" at the ends of the lines to make them into arrows.
1. File "picboxes.tr"
=====================
.LP
I'd like to include a simple diagram in a man page,
.br
something like this :
.sp
.PS
bwd=0.75 # Width of each box
bht=1.0 # Height of each box
bsp=0.75 # Spacing between boxes
lsp=0.2 # Half of spacing between "arrows"
box wid bwd ht bht 1 "X"
define border {
line from last box.sw to last box.se \
to last box.ne to last box.nw to last box.sw
}
border
line -> right bsp from last box.e + (0,lsp) "A" " "
box wid bwd ht bht with .w at last box.e + (bsp,0) "Y"
border
line -> right bsp from last box.e + (0,lsp) "C" " "
line -> left bsp from last box.w - (0,lsp) " " "B"
box wid bwd ht bht with .w at last box.e + (bsp,0) "Z"
border
line -> left bsp from last box.w - (0,lsp) " " "D"
.PE
.sp
I suppose I could use tbl or switch to a fixed-spacing
.br
font and use .nf. What would you recommend ?
2. groff command (in terminal):
===============================
groff -Tlatin1 -p -ms picboxes.tr | less
3. What you see when you run the above:
=======================================
I'd like to include a simple diagram in a man page,
something like this :
+------+ +------+ +------+
| | A | | C | |
| +-------| +-------| |
| X | | Y | | Z |
| |-------+ |-------+ |
| | B | | D | |
+------+ +------+ +------+
I suppose I could use tbl or switch to a fixed-spacing
font and use .nf. What would you recommend ?
COMMENTS:
=========
Note that the lines, while they have their starting points
indicated ("+"), do not have ">" or "<" at the ends for arrows,
despite being coded as "line ->" or "line <-" which certainly
work for PostScript output.
ALSO, note the presence in the pic code of "define border {...}",
followed by invocations of the macro "border" subsequent to each box.
I had to put this in because, with "-Tascii" or "-Tlatin1",
the 'box' command on its own draws no lines, so you don't see
the boxes. Hence I put in the macro "border" to draw the borders
of the boxes using explicit "line" commands.
These problems would not arise with PostScript output, but I am
puzzled as to why they should occur with ASCII otuput to a terminal.
Ted.
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E-Mail: (Ted Harding) <ted.hard...@manchester.ac.uk>
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Date: 20-Aug-10 Time: 10:24:07
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