* Getting width of text to be typeset
@ 2020-05-22 9:22 context
2020-05-22 22:03 ` Hans Hagen
0 siblings, 1 reply; 6+ messages in thread
From: context @ 2020-05-22 9:22 UTC (permalink / raw)
To: ConTeXt
Hello,
is it possible to get somehow the width of the "material" (box?) of the
current line which is "ready" to be typeset?
See the case:
----
\starttext
some text
pqrs % Here I need to get width (or content) of the text from the
begin of the current line,
% i.e. width of the text "pqrs".
% (Depending of the width I will decide what to do later.)
\stoptext
----
I am too laical to know how to "inject" TeX workflow or whether to
access LuaTeX internals (nodes?) to get the desired information.
- Is it possible somehow?
Best regards,
Lukas
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Getting width of text to be typeset
2020-05-22 9:22 Getting width of text to be typeset context
@ 2020-05-22 22:03 ` Hans Hagen
2020-05-22 22:18 ` Hans Hagen
0 siblings, 1 reply; 6+ messages in thread
From: Hans Hagen @ 2020-05-22 22:03 UTC (permalink / raw)
To: mailing list for ConTeXt users
On 5/22/2020 11:22 AM, context@vivaldi.net wrote:
> Hello,
>
> is it possible to get somehow the width of the "material" (box?) of the
> current line which is "ready" to be typeset?
>
> See the case:
>
> ----
> \starttext
>
> some text
>
> pqrs % Here I need to get width (or content) of the text from the
> begin of the current line,
> % i.e. width of the text "pqrs".
> % (Depending of the width I will decide what to do later.)
>
> \stoptext
> ----
>
> I am too laical to know how to "inject" TeX workflow or whether to
> access LuaTeX internals (nodes?) to get the desired information.
>
> - Is it possible somehow?
Too easy ...
\startluacode
function document.whatever()
context(nodes.hpack(tex.getnest().head.next).width)
end
\stopluacode
\unexpanded\def\widthuptohere{\dimexpr\ctxlua{document.whatever()}sp\relax}
\starttext
\dorecurse {10} {
snippet #1\scratchdimen\widthuptohere\ has \the\scratchdimen\
width\par
}
\stoptext
but still you have to wikify it ... maybe i'll make it a low level
helper (but than you also need to wikify that because i have no clue
where to explain it)
Hans
-----------------------------------------------------------------
Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Getting width of text to be typeset
2020-05-22 22:03 ` Hans Hagen
@ 2020-05-22 22:18 ` Hans Hagen
2020-05-22 23:49 ` Rik Kabel
0 siblings, 1 reply; 6+ messages in thread
From: Hans Hagen @ 2020-05-22 22:18 UTC (permalink / raw)
To: mailing list for ConTeXt users
On 5/23/2020 12:03 AM, Hans Hagen wrote:
> On 5/22/2020 11:22 AM, context@vivaldi.net wrote:
>> Hello,
>>
>> is it possible to get somehow the width of the "material" (box?) of
>> the current line which is "ready" to be typeset?
>>
>> See the case:
>>
>> ----
>> \starttext
>>
>> some text
>>
>> pqrs % Here I need to get width (or content) of the text from the
>> begin of the current line,
>> % i.e. width of the text "pqrs".
>> % (Depending of the width I will decide what to do later.)
>>
>> \stoptext
>> ----
>>
>> I am too laical to know how to "inject" TeX workflow or whether to
>> access LuaTeX internals (nodes?) to get the desired information.
>>
>> - Is it possible somehow?
> Too easy ...
>
> \startluacode
> function document.whatever()
> context(nodes.hpack(tex.getnest().head.next).width)
> end
> \stopluacode
>
> \unexpanded\def\widthuptohere{\dimexpr\ctxlua{document.whatever()}sp\relax}
>
> \starttext
>
> \dorecurse {10} {
> snippet #1\scratchdimen\widthuptohere\ has \the\scratchdimen\
> width\par
> }
>
> \stoptext
>
> but still you have to wikify it ... maybe i'll make it a low level
> helper (but than you also need to wikify that because i have no clue
> where to explain it)
Actually, one needs to flush a bit
\startluacode
function document.whatever()
local h = nodes.hpack(tex.getnest().head.next)
local w = h.width
h.list = nil
nodes.free(h)
context(w)
end
\stopluacode
\unexpanded\def\widthuptohere{\dimexpr\ctxlua{document.whatever()}sp\relax}
\starttext
\dorecurse {10} {
snippet #1\scratchdimen\widthuptohere\ has \the\scratchdimen\
width\par
}
\stoptext
not that it matters much, because it's unlikely that you leak more than
a dozen nodes in a run.
Hans
-----------------------------------------------------------------
Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------
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___________________________________________________________________________________
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Getting width of text to be typeset
2020-05-22 22:18 ` Hans Hagen
@ 2020-05-22 23:49 ` Rik Kabel
2020-05-23 11:04 ` Gerben Wierda
2020-05-23 13:52 ` Rik Kabel
0 siblings, 2 replies; 6+ messages in thread
From: Rik Kabel @ 2020-05-22 23:49 UTC (permalink / raw)
To: ntg-context
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On 5/22/2020 18:18, Hans Hagen wrote:
> On 5/23/2020 12:03 AM, Hans Hagen wrote:
>> On 5/22/2020 11:22 AM, context@vivaldi.net wrote:
>>> Hello,
>>>
>>> is it possible to get somehow the width of the "material" (box?) of
>>> the current line which is "ready" to be typeset?
>>>
>>> See the case:
>>>
>>> ----
>>> \starttext
>>>
>>> some text
>>>
>>> pqrs % Here I need to get width (or content) of the text from the
>>> begin of the current line,
>>> % i.e. width of the text "pqrs".
>>> % (Depending of the width I will decide what to do later.)
>>>
>>> \stoptext
>>> ----
>>>
>>> I am too laical to know how to "inject" TeX workflow or whether to
>>> access LuaTeX internals (nodes?) to get the desired information.
>>>
>>> - Is it possible somehow?
>> Too easy ...
>>
>> \startluacode
>> function document.whatever()
>> context(nodes.hpack(tex.getnest().head.next).width)
>> end
>> \stopluacode
>>
>> \unexpanded\def\widthuptohere{\dimexpr\ctxlua{document.whatever()}sp\relax}
>>
>>
>> \starttext
>>
>> \dorecurse {10} {
>> snippet #1\scratchdimen\widthuptohere\ has
>> \the\scratchdimen\ width\par
>> }
>>
>> \stoptext
>>
>> but still you have to wikify it ... maybe i'll make it a low level
>> helper (but than you also need to wikify that because i have no clue
>> where to explain it)
> Actually, one needs to flush a bit
>
> \startluacode
> function document.whatever()
> local h = nodes.hpack(tex.getnest().head.next)
> local w = h.width
> h.list = nil
> nodes.free(h)
> context(w)
> end
> \stopluacode
>
> \unexpanded\def\widthuptohere{\dimexpr\ctxlua{document.whatever()}sp\relax}
>
>
> \starttext
>
> \dorecurse {10} {
> snippet #1\scratchdimen\widthuptohere\ has \the\scratchdimen\
> width\par
> }
>
> \stoptext
>
> not that it matters much, because it's unlikely that you leak more
> than a dozen nodes in a run.
>
> Hans
>
If the OP simply wants the width of a string, one can use
\setwidthof#1\to#2.
\define\String{pqrs}
\setwidthof{\String}\to\Wdth
\String\ is \Wdth\ wide.
\setwidthof{{\tfb\em\String}}\to\Wdth
{\tfb\em\String} is \Wdth\ wide.
I do not know if that is different from the width of the same string
unboxed from the paragraph. There may be some adjustments made in
justification, expansion, and such that are not treated.
--
Rik
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___________________________________________________________________________________
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maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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___________________________________________________________________________________
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Getting width of text to be typeset
2020-05-22 23:49 ` Rik Kabel
@ 2020-05-23 11:04 ` Gerben Wierda
2020-05-23 13:52 ` Rik Kabel
1 sibling, 0 replies; 6+ messages in thread
From: Gerben Wierda @ 2020-05-23 11:04 UTC (permalink / raw)
To: mailing list for ConTeXt users
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> On 23 May 2020, at 01:49, Rik Kabel <ConTeXt@rik.users.panix.com> wrote:
>
> If the OP simply wants the width of a string, one can use \setwidthof#1\to#2.
>
> \define\String{pqrs}
> \setwidthof{\String}\to\Wdth
> \String\ is \Wdth\ wide.
>
> \setwidthof{{\tfb\em\String}}\to\Wdth
> {\tfb\em\String} is \Wdth\ wide.
>
> I do not know if that is different from the width of the same string unboxed from the paragraph. There may be some adjustments made in justification, expansion, and such that are not treated.
Additionally: suppose I am in lua. Would it be possible to get the width (and height) of a string back in lua as a value?
So, in lua something like this:
width = tex.widthofstring(“I have a string with some $\frac{1}2{}$ (math) in it")
G
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___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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___________________________________________________________________________________
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Getting width of text to be typeset
2020-05-22 23:49 ` Rik Kabel
2020-05-23 11:04 ` Gerben Wierda
@ 2020-05-23 13:52 ` Rik Kabel
1 sibling, 0 replies; 6+ messages in thread
From: Rik Kabel @ 2020-05-23 13:52 UTC (permalink / raw)
To: ntg-context
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On 5/22/2020 19:49, Rik Kabel wrote:
>
> If the OP simply wants the width of a string, one can use
> \setwidthof#1\to#2.
>
> \define\String{pqrs}
> \setwidthof{\String}\to\Wdth
> \String\ is \Wdth\ wide.
>
> \setwidthof{{\tfb\em\String}}\to\Wdth
> {\tfb\em\String} is \Wdth\ wide.
>
> I do not know if that is different from the width of the same string
> unboxed from the paragraph. There may be some adjustments made in
> justification, expansion, and such that are not treated.
>
>
Correcting my post (thank you, Floris), the format is a bit different
than I had written. The following works:
\starttext
\define\String{pqrs}
\setwidthof\String\to\WdthA
{\String} is \WdthA\ wide.
\define\String{\tfx\em pqrs}
\setwidthof\String\to\WdthB
{\String} is \WdthB\ wide.
\define\String{\ss pqrs}
\setwidthof\String\to\WdthC
{\String} is \WdthC\ wide.
\stoptext
Giving:
--
Rik
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2020-05-22 9:22 Getting width of text to be typeset context
2020-05-22 22:03 ` Hans Hagen
2020-05-22 22:18 ` Hans Hagen
2020-05-22 23:49 ` Rik Kabel
2020-05-23 11:04 ` Gerben Wierda
2020-05-23 13:52 ` Rik Kabel
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