From: Max Chernoff via ntg-context <ntg-context@ntg.nl>
To: ntg-context@ntg.nl
Cc: Max Chernoff <mseven@telus.net>
Subject: Re: how to simulate \hss in luametatex?
Date: Fri, 11 Nov 2022 02:53:38 -0700 [thread overview]
Message-ID: <132865e0748c4e51a275bfba699b0b6a9b5a10d8.camel@telus.net> (raw)
In-Reply-To: <CAHN0TNiheAok7CEaZpk0-S=mkOB20HP-92u1FZebBaGbg16iyQ@mail.gmail.com>
Hi,
> I want to simulate \hss in lua end in ConTeXt/luametatex environment.
> For example,
>
> ```ConTeXt
> a{\raise 1.5ex\hbox to 0pt{\hss b}}c
> ```
> And in lua, I do as follows(part of my app seen in attachment):
Your code doesn't compile as is. I think that this is the same thing
though:
\starttext
\startluacode
local a = node.new"glyph"
a.char = string.byte("a")
a.font = font.current()
local b = node.new"glyph"
b.char = string.byte("b")
b.font = font.current()
local c = node.new"glyph"
c.char = string.byte("c")
c.font = font.current()
local hss = node.new("glue")
hss.stretch = 65536
hss.stretchorder = 2
hss.shrink = 65536
hss.shrinkorder = 2
hss.width = 0
b = node.insertbefore(b, b, hss)
local box = node.new("hlist", "box")
box.head = b
box.width = 0
box.shift = -tex.sp("1ex")
tex.forcehmode()
node.write(a + box + c)
\stopluacode
\stoptext
> And got 'b' on top of 'c' in pdf as follows:
>
> ```pdf
> b
> ac
> ```
The \hss isn't the problem here. The problem is actually with the box.
When you manually make the \hbox like that, I think (although I could be
wrong) that you're bypassing all of TeX's glue calculations. You should
probably use "node.hpack" instead:
\starttext
\startluacode
local a = node.new"glyph"
a.char = string.byte("a")
a.font = font.current()
local b = node.new"glyph"
b.char = string.byte("b")
b.font = font.current()
local c = node.new"glyph"
c.char = string.byte("c")
c.font = font.current()
local hss = node.new("glue")
hss.stretch = 65536
hss.stretchorder = 2
hss.shrink = 65536
hss.shrinkorder = 2
hss.width = 0
local box = node.hpack(hss + b, "exactly", 0)
box.shift = -tex.sp("1ex")
tex.forcehmode()
a.next = box
box.next = c
node.write(a)
\stopluacode
\stoptext
-- Max
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next prev parent reply other threads:[~2022-11-11 9:53 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-11 2:37 黄复雄 via ntg-context
2022-11-11 9:53 ` Max Chernoff via ntg-context [this message]
2022-11-11 10:50 ` Hans Hagen via ntg-context
2022-11-11 11:00 ` 黄复雄 via ntg-context
2022-11-11 10:53 ` 黄复雄 via ntg-context
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