Adjusting parameters for a single page

Adjusting parameters for a single page

[denis.maier]

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Hi everyone,

I know it is possible to make local changes by enclosing text in \start \stop pairs to make local changes. Then, there are also commands that only affect the next/current paragraph, such as \looseness.
But is there a similar mechanism for page-layout changes? For example your penalty settings allow widows and orphans, but on one particular page you want to change the penalties. Or, you use \setupalign[height], but on one page you want to use \setupalign[bottom] instead. Is there a way to do this ?

Best,
Denis

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Re: Adjusting parameters for a single page

[Hans Hagen]

On 5/10/2021 5:15 PM, denis.maier@ub.unibe.ch wrote:
> Hi everyone,
> 
> I know it is possible to make local changes by enclosing text in \start 
> \stop pairs to make local changes. Then, there are also commands that 
> only affect the next/current paragraph, such as \looseness.
> 
> But is there a similar mechanism for page-layout changes? For example 
> your penalty settings allow widows and orphans, but on one particular 
> page you want to change the penalties. Or, you use \setupalign[height], 
> but on one page you want to use \setupalign[bottom] instead. Is there a 
> way to do this ?
it works per paragraph so then you need to adapt it for a specific 
paragraph

when the par starts, the properties are stored (in lmtx it's configured 
that way); you can change properties in the middle of a paragraph but 
then you need to explicitly freeze them, as demonstrated in the examples 
below; tracing will show you all stored properties

(default tex behaviour is that the last setting counts which can be 
somewhat unexpected)

\starttext
     \tracingoutput1 \tracingonline1
     \pretolerance9000 test \pretolerance8000 test \par
     \pretolerance9000 test \pretolerance7000 \updateparagraphproperties 
test \par
     \pretolerance9000 test \pretolerance6000 
\snapshotpar\frozentolerancecode test \par
\stoptext

the log shows ...

\par[newgraf][16=1,17=1], .... pretolerance 9000, ....
\par[newgraf][16=1,17=1], .... pretolerance 7000, ....
\par[newgraf][16=1,17=1], .... pretolerance 6000, ....

now, as you probably don't want to be persistent you can group:

\def\MyHack
   {\bgroup
    \pretolerance5000
    \snapshotpar\frozentolerancecode
    \egroup}

test \MyHack test

works ok because the snapshotting applies to the current paragraph (it's 
actually described in some manual)

so, basically, you have a lot of control, all together some 36 
parameters (pablo probably loves the somewhat secret on the fly 
adjustspacing step, stretch and shrink tweakability)

Hans

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Re: Adjusting parameters for a single page

[denis.maier]

Thanks, Hans, really interesting stuff.

> so, basically, you have a lot of control, all together some 36 parameters
> (pablo probably loves the somewhat secret on the fly adjustspacing step,
> stretch and shrink tweakability)
Any hints where I can find these 36 parameters?

Thanks for your help,
Denis
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Re: Adjusting parameters for a single page

[denis.maier]

-----Ursprüngliche Nachricht-----
> Von: Hans Hagen <j.hagen@xs4all.nl>
> Gesendet: Dienstag, 11. Mai 2021 00:13
> An: mailing list for ConTeXt users <ntg-context@ntg.nl>; Maier, Denis
> Christian (UB) <denis.maier@ub.unibe.ch>
> Betreff: Re: [NTG-context] Adjusting parameters for a single page
> 
> On 5/10/2021 5:15 PM, denis.maier@ub.unibe.ch wrote:
> > Hi everyone,
> >
> > I know it is possible to make local changes by enclosing text in
> > \start \stop pairs to make local changes. Then, there are also
> > commands that only affect the next/current paragraph, such as \looseness.
> >
> > But is there a similar mechanism for page-layout changes? For example
> > your penalty settings allow widows and orphans, but on one particular
> > page you want to change the penalties. Or, you use
> > \setupalign[height], but on one page you want to use
> > \setupalign[bottom] instead. Is there a way to do this ?
> it works per paragraph so then you need to adapt it for a specific paragraph

So, that means you cannot make changes to a page, but only to paragraph. If a paragraph goes over page boundaries, you cannot add stretch or shrink interlinespace for just one page... correct?


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Re: Adjusting parameters for a single page

[luigi scarso]

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On Tue, May 11, 2021 at 10:29 AM <denis.maier@ub.unibe.ch> wrote:

> -----Ursprüngliche Nachricht-----
> > Von: Hans Hagen <j.hagen@xs4all.nl>
> > Gesendet: Dienstag, 11. Mai 2021 00:13
> > An: mailing list for ConTeXt users <ntg-context@ntg.nl>; Maier, Denis
> > Christian (UB) <denis.maier@ub.unibe.ch>
> > Betreff: Re: [NTG-context] Adjusting parameters for a single page
> >
> > On 5/10/2021 5:15 PM, denis.maier@ub.unibe.ch wrote:
> > > Hi everyone,
> > >
> > > I know it is possible to make local changes by enclosing text in
> > > \start \stop pairs to make local changes. Then, there are also
> > > commands that only affect the next/current paragraph, such as
> \looseness.
> > >
> > > But is there a similar mechanism for page-layout changes? For example
> > > your penalty settings allow widows and orphans, but on one particular
> > > page you want to change the penalties. Or, you use
> > > \setupalign[height], but on one page you want to use
> > > \setupalign[bottom] instead. Is there a way to do this ?
> > it works per paragraph so then you need to adapt it for a specific
> paragraph
>
> So, that means you cannot make changes to a page, but only to paragraph.
> If a paragraph goes over page boundaries, you cannot add stretch or shrink
> interlinespace for just one page... correct?
>

this looks more a otr technique, e.g.
 https://www.tug.org/TUGboat/tb11-1/tb27salomon.pdf
(or grep the context code for otr)


-- 
luigi

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Re: Adjusting parameters for a single page

[denis.maier]

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Von: ntg-context <ntg-context-bounces@ntg.nl> Im Auftrag von luigi scarso
Gesendet: Dienstag, 11. Mai 2021 10:41
An: mailing list for ConTeXt users <ntg-context@ntg.nl>
Betreff: Re: [NTG-context] Adjusting parameters for a single page



On Tue, May 11, 2021 at 10:29 AM <denis.maier@ub.unibe.ch<mailto:denis.maier@ub.unibe.ch>> wrote:
-----Ursprüngliche Nachricht-----
> Von: Hans Hagen <j.hagen@xs4all.nl<mailto:j.hagen@xs4all.nl>>
> Gesendet: Dienstag, 11. Mai 2021 00:13
> An: mailing list for ConTeXt users <ntg-context@ntg.nl<mailto:ntg-context@ntg.nl>>; Maier, Denis
> Christian (UB) <denis.maier@ub.unibe.ch<mailto:denis.maier@ub.unibe.ch>>
> Betreff: Re: [NTG-context] Adjusting parameters for a single page
>
> On 5/10/2021 5:15 PM, denis.maier@ub.unibe.ch<mailto:denis.maier@ub.unibe.ch> wrote:
> > Hi everyone,
> >
> > I know it is possible to make local changes by enclosing text in
> > \start \stop pairs to make local changes. Then, there are also
> > commands that only affect the next/current paragraph, such as \looseness.
> >
> > But is there a similar mechanism for page-layout changes? For example
> > your penalty settings allow widows and orphans, but on one particular
> > page you want to change the penalties. Or, you use
> > \setupalign[height], but on one page you want to use
> > \setupalign[bottom] instead. Is there a way to do this ?
> it works per paragraph so then you need to adapt it for a specific paragraph

So, that means you cannot make changes to a page, but only to paragraph. If a paragraph goes over page boundaries, you cannot add stretch or shrink interlinespace for just one page... correct?

this looks more a otr technique, e.g.
 https://www.tug.org/TUGboat/tb11-1/tb27salomon.pdf
(or grep the context code for otr)


Thanks for the hint. I have TeX by Topic open at the moment :-)

Denis

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maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
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