hsize changes unexpectedly

hsize changes unexpectedly

[Rik Kabel]

Why does \hsize revert to \textwidth after a page and a paragraph?

  \starttext
    \hsize200pt
    \dorecurse{60}{\recurselevel: \the\hsize\ \the\textwidth\par}
  \stoptext

-- 
Rik

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Re: hsize changes unexpectedly

[Hans Hagen]

On 11/20/2016 2:47 AM, Rik Kabel wrote:
> Why does \hsize revert to \textwidth after a page and a paragraph?
>
>  \starttext
>    \hsize200pt
>    \dorecurse{60}{\recurselevel: \the\hsize\ \the\textwidth\par}
>  \stoptext

because the main text flow width and height settings are synchronized 
... \hsize and \vsize are for local use

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                                           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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Re: hsize changes unexpectedly

[Rik Kabel]

On 2016-11-20 05:53, Hans Hagen wrote:
> On 11/20/2016 2:47 AM, Rik Kabel wrote:
>> Why does \hsize revert to \textwidth after a page and a paragraph?
>>
>>  \starttext
>>    \hsize200pt
>>    \dorecurse{60}{\recurselevel: \the\hsize\ \the\textwidth\par}
>>  \stoptext
>
> because the main text flow width and height settings are synchronized 
> ... \hsize and \vsize are for local use
Okay.

What is the scope of local use? It is different from grouping (as 
demonstrated by placing the middle two lines above in braces).

-- 
Rik
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Re: hsize changes unexpectedly

[Wolfgang Schuster]

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> Rik Kabel <mailto:context@rik.users.panix.com>
> 20. November 2016 um 17:49
>
> Okay.
>
> What is the scope of local use?
It’s used to change the width of a \vbox.

\starttext

\ruledvbox\bgroup
     \input ward
\egroup

\ruledvbox\bgroup
     \hsize.5\textwidth
     \input ward
\egroup

\stoptext

> It is different from grouping (as demonstrated by placing the middle 
> two lines above in braces).
Which example?

Wolfgang

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Re: hsize changes unexpectedly

[Rik]

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On 2016-11-20 12:16, Wolfgang Schuster wrote:
>> Rik Kabel <mailto:context@rik.users.panix.com>
>> 20. November 2016 um 17:49
>>
>> Okay.
>>
>> What is the scope of local use?
> It’s used to change the width of a \vbox.
>
> \starttext
>
> \ruledvbox\bgroup
>     \input ward
> \egroup
>
> \ruledvbox\bgroup
>     \hsize.5\textwidth
>     \input ward
> \egroup
>
> \stoptext
>
>> It is different from grouping (as demonstrated by placing the middle 
>> two lines above in braces).
> Which example?
>
> Wolfgang

Sorry, the example at the head of the thread. Originally:

    \starttext

        \hsize200pt

        \dorecurse{60}{\recurselevel: \the\hsize\ \the\textwidth\par}

      \stoptext

And with the \hsize in a group :

    \starttext

        {\hsize200pt

        \dorecurse{60}{\recurselevel: \the\hsize\ \the\textwidth\par}}

      \stoptext

I did not expect it to change the result, and it does not. So I was 
asking just what Hans meant by “local use.”

-- 
Rik


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Re: hsize changes unexpectedly

[Hans Hagen]

On 11/20/2016 5:49 PM, Rik Kabel wrote:
> On 2016-11-20 05:53, Hans Hagen wrote:
>> On 11/20/2016 2:47 AM, Rik Kabel wrote:
>>> Why does \hsize revert to \textwidth after a page and a paragraph?
>>>
>>>  \starttext
>>>    \hsize200pt
>>>    \dorecurse{60}{\recurselevel: \the\hsize\ \the\textwidth\par}
>>>  \stoptext
>>
>> because the main text flow width and height settings are synchronized
>> ... \hsize and \vsize are for local use
> Okay.
>
> What is the scope of local use? It is different from grouping (as
> demonstrated by placing the middle two lines above in braces).

\vbox { \hsize ... }

-----------------------------------------------------------------
                                           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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___________________________________________________________________________________

Re: hsize changes unexpectedly

[Hans Hagen]

On 11/20/2016 6:37 PM, Rik wrote:
> On 2016-11-20 12:16, Wolfgang Schuster wrote:
>>> Rik Kabel <mailto:context@rik.users.panix.com>
>>> 20. November 2016 um 17:49
>>>
>>> Okay.
>>>
>>> What is the scope of local use?
>> It’s used to change the width of a \vbox.
>>
>> \starttext
>>
>> \ruledvbox\bgroup
>>     \input ward
>> \egroup
>>
>> \ruledvbox\bgroup
>>     \hsize.5\textwidth
>>     \input ward
>> \egroup
>>
>> \stoptext
>>
>>> It is different from grouping (as demonstrated by placing the middle
>>> two lines above in braces).
>> Which example?
>>
>> Wolfgang
>
> Sorry, the example at the head of the thread. Originally:
>
>     \starttext
>
>        \hsize200pt
>
>        \dorecurse{60}{\recurselevel: \the\hsize\ \the\textwidth\par}
>
>      \stoptext
>
> And with the \hsize in a group :
>
>     \starttext
>
>        {\hsize200pt
>
>        \dorecurse{60}{\recurselevel: \the\hsize\ \the\textwidth\par}}
>
>      \stoptext
>
> I did not expect it to change the result, and it does not. So I was
> asking just what Hans meant by “local use.”

when you add stuff to the page it happens globally till (normally) tex 
splits off the content that fits to the pagegoal (which is taken from 
vsize) .. in principle we could leave hsize untouched but for 
consistency and predictability we use textwidth etc .. this has always 
been the case



-- 

-----------------------------------------------------------------
                                           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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___________________________________________________________________________________