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Re: pic doesn't center when i use a macro
From: |
Holger Herrlich |
Subject: |
Re: pic doesn't center when i use a macro |
Date: |
Thu, 4 Nov 2021 07:22:32 +0100 |
.PS
define label_for {[
if $1 == 0 then { "Entête Ethernet" } else {
if $1 == 1 then { "Entête IP" } else {
if $1 == 2 then { "Entête TCP" } else {
if $1 == 3 then { "Donnees applicatives" } else {
} } } }
]}
w = 3 ; h = 2; margin = .2 ; tr = 2 * margin
for layer = 0 to 3 do {
s = layer * margin
box width w height h with .sw at (s,s)
box width w height margin with .nw at last box .nw dashed
label_for(layer) at last box.c
w = w - tr
h = h - tr
}
.PE
On Mon, 1 Nov 2021 19:57:15 +0100
Marc Chantreux <eiro@phear.org> wrote:
> hello groffers,
>
> I wrote the following code to illustrate the DOD model encapsulation.
>
> sadly: the label of the layers are not centred. it seems to be
> relative to the fact i use a function as it works fine when i replace
> label_for(layer) by a simple string
>
> like
>
> box width w height margin \
> with .nw at last box .nw dashed \
> "" label_for(layer) ""
>
> by
>
> box width w height margin \
> with .nw at last box .nw dashed \
> "" "eat the road, jack" ""
>
> I can do something more manual but i really would like to take
> advantage of the expressivity of pic. Any other comment is also
> warmly welcome.
>
> regards,
> marc
>
> # compiled with
> # scan.ps: scan.ms ${deps} ; groff -skp -ms -mfr $< > $@
>
> .PS
>
> define label_for {
> if $1 == 0 then { "Entête Ethernet" } else {
> if $1 == 1 then { "Entête IP" } else {
> if $1 == 2 then { "Entête TCP" } else {
> if $1 == 3 then { "Donnees applicatives" } else {
> } } } }
> }
>
> w = 3 ; h = 2; margin = .2 ; tr = 2 * margin
> for layer = 0 to 3 do {
> s = layer * margin
> box width w height h with .sw at (s,s)
> box width w height margin with .nw at last box .nw dashed ""
> label_for(layer) "" w = w - tr
> h = h - tr
> }
> .PE
>
>