From: Hans Hagen via ntg-context <ntg-context@ntg.nl>
To: Max Chernoff via ntg-context <ntg-context@ntg.nl>
Cc: Hans Hagen <j.hagen@freedom.nl>
Subject: Re: how to simulate \hss in luametatex?
Date: Fri, 11 Nov 2022 11:50:51 +0100 [thread overview]
Message-ID: <36ad4a3e-7221-ce94-c642-3fa5d681280c@freedom.nl> (raw)
In-Reply-To: <132865e0748c4e51a275bfba699b0b6a9b5a10d8.camel@telus.net>
On 11/11/2022 10:53 AM, Max Chernoff via ntg-context wrote:
> 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
indeed, an dafter that you can check it
box.glueorder : 2
box.glueset : 6.6683349609375
box.gluesign : 2
which will be applied (in the backend) to glues
Hans
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next prev parent reply other threads:[~2022-11-11 10:50 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
2022-11-11 10:50 ` Hans Hagen via ntg-context [this message]
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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