How to calculate the height of text of a certain width?

How to calculate the height of text of a certain width?

[Rudolf Bahr]

Hello dear All,

the following MWE works best:


\definelayer[LAY]
\starttext

\setlayerframed[LAY]
  [x=0pt,y=20pt]
  [frame=on,
   width=300pt,
   align={right,}]   % tolerant}]
  {\input ward }
 
\flushlayer[LAY]
\stoptext


Now, it could have a favourable effect on designing a page if the height of a text
of certain width could be calculated in advance, depending of the font.
Is there a way?

As I fear, TeX's means "\setbox" woun't work with aligned texts.

Best wishes, remain healthy,
Rudolf
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Re: How to calculate the height of text of a certain width?

[Wolfgang Schuster]

Rudolf Bahr schrieb am 24.03.2020 um 12:19:
> Hello dear All,
> 
> the following MWE works best:
> 
> 
> \definelayer[LAY]
> \starttext
> 
> \setlayerframed[LAY]
>    [x=0pt,y=20pt]
>    [frame=on,
>     width=300pt,
>     align={right,}]   % tolerant}]
>    {\input ward }
>   
> \flushlayer[LAY]
> \stoptext
> 
> 
> Now, it could have a favourable effect on designing a page if the height of a text
> of certain width could be calculated in advance, depending of the font.
> Is there a way?
> 
> As I fear, TeX's means "\setbox" woun't work with aligned texts.

Can you give more details, I have no idea what you mean with aligned 
texts (layers?).

Wolfgang
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Re: How to calculate the height of text of a certain width?

[Rudolf Bahr]

On Tue, Mar 24, 2020 at 03:56:18PM +0100, Wolfgang Schuster wrote:
> Rudolf Bahr schrieb am 24.03.2020 um 12:19:
> > Hello dear All,
> > 
> > the following MWE works best:
> > 
> > 
> > \definelayer[LAY]
> > \starttext
> > 
> > \setlayerframed[LAY]
> >    [x=0pt,y=20pt]
> >    [frame=on,
> >     width=300pt,
> >     align={right,}]   % tolerant}]
> >    {\input ward }
> > \flushlayer[LAY]
> > \stoptext
> > 
> > 
> > Now, it could have a favourable effect on designing a page if the height of a text
> > of certain width could be calculated in advance, depending of the font.
> > Is there a way?
> > 
> > As I fear, TeX's means "\setbox" woun't work with aligned texts.
> 
> Can you give more details, I have no idea what you mean with aligned texts
> (layers?).
> 
> Wolfgang


Hi Wolfgang,

With "aligned texts" I thought of "align={right,}]" in the above example or
text which is "flushed right":

\setbox0=\vbox{... somehow flushed text ...} wount work, i.e \wd0 or \ht0
will both result in 0. With "unflushed" text this means will work perfectly.

Sorry for the inconvinience to having been not very clear.

Rudolf
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Re: How to calculate the height of text of a certain width?

[Aditya Mahajan]

On Tue, 24 Mar 2020, Rudolf Bahr wrote:

> On Tue, Mar 24, 2020 at 03:56:18PM +0100, Wolfgang Schuster wrote:
>> Rudolf Bahr schrieb am 24.03.2020 um 12:19:
>> > Hello dear All,
>> > 
>> > the following MWE works best:
>> > 
>> > 
>> > \definelayer[LAY]
>> > \starttext
>> > 
>> > \setlayerframed[LAY]
>> >    [x=0pt,y=20pt]
>> >    [frame=on,
>> >     width=300pt,
>> >     align={right,}]   % tolerant}]
>> >    {\input ward }
>> > \flushlayer[LAY]
>> > \stoptext
>> > 
>> > 
>> > Now, it could have a favourable effect on designing a page if the height of a text
>> > of certain width could be calculated in advance, depending of the font.
>> > Is there a way?
>> > 
>> > As I fear, TeX's means "\setbox" woun't work with aligned texts.
>> 
>> Can you give more details, I have no idea what you mean with aligned texts
>> (layers?).
>> 
>> Wolfgang
>
>
> Hi Wolfgang,
>
> With "aligned texts" I thought of "align={right,}]" in the above example or
> text which is "flushed right":
>
> \setbox0=\vbox{... somehow flushed text ...} wount work, i.e \wd0 or \ht0
> will both result in 0. With "unflushed" text this means will work perfectly.

You can do:


\definelayer[LAY]

\starttext

\setbox\scratchbox=\vbox{\framed[width=300pt, align=flushleft]{\input 
ward\relax}}
The height of the box is \the\ht\scratchbox; the width is 
\the\wd\scratchbox.
\unvbox\scratchbox

\setlayerframed[LAY][x=0pt, y=20pt][width=300pt, align=flushleft]{\input 
ward\relax}
\flushlayer[LAY]

\stoptext

Aditya
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Re: How to calculate the height of text of a certain width?

[Wolfgang Schuster]

Rudolf Bahr schrieb am 24.03.2020 um 16:29:
> On Tue, Mar 24, 2020 at 03:56:18PM +0100, Wolfgang Schuster wrote:
>> Rudolf Bahr schrieb am 24.03.2020 um 12:19:
>>> Hello dear All,
>>>
>>> the following MWE works best:
>>>
>>>
>>> \definelayer[LAY]
>>> \starttext
>>>
>>> \setlayerframed[LAY]
>>>     [x=0pt,y=20pt]
>>>     [frame=on,
>>>      width=300pt,
>>>      align={right,}]   % tolerant}]
>>>     {\input ward }
>>> \flushlayer[LAY]
>>> \stoptext
>>>
>>>
>>> Now, it could have a favourable effect on designing a page if the height of a text
>>> of certain width could be calculated in advance, depending of the font.
>>> Is there a way?
>>>
>>> As I fear, TeX's means "\setbox" woun't work with aligned texts.
>>
>> Can you give more details, I have no idea what you mean with aligned texts
>> (layers?).
>>
>> Wolfgang
> 
> 
> Hi Wolfgang,
> 
> With "aligned texts" I thought of "align={right,}]" in the above example or
> text which is "flushed right":
> 
> \setbox0=\vbox{... somehow flushed text ...} wount work, i.e \wd0 or \ht0
> will both result in 0. With "unflushed" text this means will work perfectly.

I have no idea where you get 0 (0pt?).

\starttexdefinition NextboxDimension
   \starttabulate
   \NC Width  \EQ \the\nextboxwd \NC\NR
   \NC Height \NC \the\nextboxht \NC\NR
   \stoptabulate
\stoptexdefinition

\starttext

\dowithnextboxcs
   \NextboxDimension
   \vbox
     {\samplefile{ward}}

\dowithnextboxcs
   \NextboxDimension
   \vbox
     {\setupalign[flushright]
      \samplefile{ward}}

\dowithnextboxcs
   \NextboxDimension
   \vbox
     {\hsize=200pt
      \samplefile{ward}}

\dowithnextboxcs
   \NextboxDimension
   \vbox
     {\hsize=200pt
      \setupalign[flushright]
      \samplefile{ward}}

\stoptext

Wolfgang
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Re: How to calculate the height of text of a certain width?

[Rudolf Bahr]

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On Tue, Mar 24, 2020 at 04:43:17PM +0100, Wolfgang Schuster wrote:
> > \setbox0=\vbox{... somehow flushed text ...} wount work, i.e \wd0 or \ht0
> > will both result in 0. With "unflushed" text this means will work perfectly.
> 
> I have no idea where you get 0 (0pt?).

Nor do I, in the meantime. Sorry for my noise, I don't know what sort of
mistakes I did to get "0.0pt".
Corona? :-)

This is my test, which is essentially the same what Aditya suggests:
-----------------------------------------
\starttext

\setbox0=\vbox{\hsize=300pt\input ward }
\copy0

wd0=\the\wd0, ht0=\the\ht0

\vskip12pt

\startalign[flushleft]
\setbox1=\vbox{\hsize=300pt\input ward }
\stopalign
\copy1

wd1=\the\wd1, ht1=\the\ht1

\stoptext
-----------------------------------------
The .pdf-file is appended


Now to your proposal, Wolfgang:
> 
> \starttexdefinition NextboxDimension
>   \starttabulate
>   \NC Width  \EQ \the\nextboxwd \NC\NR
>   \NC Height \NC \the\nextboxht \NC\NR
>   \stoptabulate
> \stoptexdefinition
> 
> \starttext
> 
> \dowithnextboxcs
>   \NextboxDimension
>   \vbox
>     {\samplefile{ward}}
> 
> \dowithnextboxcs
>   \NextboxDimension
>   \vbox
>     {\setupalign[flushright]
>      \samplefile{ward}}
> 
> \dowithnextboxcs
>   \NextboxDimension
>   \vbox
>     {\hsize=200pt
>      \samplefile{ward}}
> 
> \dowithnextboxcs
>   \NextboxDimension
>   \vbox
>     {\hsize=200pt
>      \setupalign[flushright]
>      \samplefile{ward}}
> 
> \stoptext

Up to now I cannot say anything about it, because there are some
commands which are new to me. I have to study them first.
Thank you for your effort!

Rudolf

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Re: How to calculate the height of text of a certain width?

[Wolfgang Schuster]

Rudolf Bahr schrieb am 24.03.2020 um 19:04:
> On Tue, Mar 24, 2020 at 04:43:17PM +0100, Wolfgang Schuster wrote:
>>> \setbox0=\vbox{... somehow flushed text ...} wount work, i.e \wd0 or \ht0
>>> will both result in 0. With "unflushed" text this means will work perfectly.
>>
>> I have no idea where you get 0 (0pt?).
> 
> Nor do I, in the meantime. Sorry for my noise, I don't know what sort of
> mistakes I did to get "0.0pt".
> Corona? :-)
> 
> This is my test, which is essentially the same what Aditya suggests:
> -----------------------------------------
> \starttext
> 
> \setbox0=\vbox{\hsize=300pt\input ward }
> \copy0
> 
> wd0=\the\wd0, ht0=\the\ht0
> 
> \vskip12pt
> 
> \startalign[flushleft]
> \setbox1=\vbox{\hsize=300pt\input ward }
> \stopalign
> \copy1
> 
> wd1=\the\wd1, ht1=\the\ht1
> 
> \stoptext
> -----------------------------------------
> The .pdf-file is appended

When you need the height for the layer offset you can use \dowithnextbox 
because it hides \setbox etc.

\definelayer[TextBox]

\showframe[text][text]

\starttext

\dowithnextbox
   {\setlayer
      [TextBox]
      [x=\the\dimexpr(\textwidth -\nextboxwd)/3\relax,
       y=\the\dimexpr(\textheight-\nextboxht)/3\relax]
      {\flushnextbox}}
   \hbox{\framed[width=300pt,align=normal]{\samplefile{ward}}}

\flushlayer[TextBox]

\stoptext

> Now to your proposal, Wolfgang:
>>
>> \starttexdefinition NextboxDimension
>>    \starttabulate
>>    \NC Width  \EQ \the\nextboxwd \NC\NR
>>    \NC Height \NC \the\nextboxht \NC\NR
>>    \stoptabulate
>> \stoptexdefinition
>>
>> \starttext
>>
>> \dowithnextboxcs
>>    \NextboxDimension
>>    \vbox
>>      {\samplefile{ward}}
>>
>> \dowithnextboxcs
>>    \NextboxDimension
>>    \vbox
>>      {\setupalign[flushright]
>>       \samplefile{ward}}
>>
>> \dowithnextboxcs
>>    \NextboxDimension
>>    \vbox
>>      {\hsize=200pt
>>       \samplefile{ward}}
>>
>> \dowithnextboxcs
>>    \NextboxDimension
>>    \vbox
>>      {\hsize=200pt
>>       \setupalign[flushright]
>>       \samplefile{ward}}
>>
>> \stoptext
> 
> Up to now I cannot say anything about it, because there are some
> commands which are new to me. I have to study them first.

The \dowithnextbox command stores the passed argument in the named box 
\nextbox and performs the content of the first argument (or the command 
when you use \dowithnextbox*cs*).

The get the width and height of the box you can use \wd\nextbox or the 
wrapper \nextboxwd. The content of the box can be flushed with 
\flushnextbox but when you need only a copy of it you have to use 
\copy\nextbox.

Wolfgang

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Re: How to calculate the height of text of a certain width?

[Rudolf Bahr]

On Tue, Mar 24, 2020 at 11:36:30AM -0400, Aditya Mahajan wrote:
> 
> You can do:
> 
> 
> \definelayer[LAY]
> 
> \starttext
> 
> \setbox\scratchbox=\vbox{\framed[width=300pt, align=flushleft]{\input
> ward\relax}}
> The height of the box is \the\ht\scratchbox; the width is
> \the\wd\scratchbox.
> \unvbox\scratchbox
> 
> \setlayerframed[LAY][x=0pt, y=20pt][width=300pt, align=flushleft]{\input
> ward\relax}
> \flushlayer[LAY]
> 
> \stoptext
> 
> Aditya

Yes, that's essentially the same method I used, but I must have done a
mistake with serious consequences concerning flushleft align text. And so
I wrote to the list with my question.

Thank you for your effort, Aditya!

Rudolf
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Re: How to calculate the height of text of a certain width?

[Rudolf Bahr]

On Tue, Mar 24, 2020 at 07:29:26PM +0100, Wolfgang Schuster wrote:
> 
> When you need the height for the layer offset you can use \dowithnextbox
> because it hides \setbox etc.
> 
> \definelayer[TextBox]
> 
> \showframe[text][text]
> 
> \starttext
> 
> \dowithnextbox
>   {\setlayer
>      [TextBox]
>      [x=\the\dimexpr(\textwidth -\nextboxwd)/3\relax,
>       y=\the\dimexpr(\textheight-\nextboxht)/3\relax]
>      {\flushnextbox}}
>   \hbox{\framed[width=300pt,align=normal]{\samplefile{ward}}}
> 
> \flushlayer[TextBox]
> 
> \stoptext


Thank you! I played with the example a bit, all works well with one exception:
When I replace "align=normal" by "align=left" the frame gets too wide at it's
left edge. I append this pdf-file. But "align=right" works well and that's what
I'm using most. Your Example is well suited to be used in page design!


> > > 
> > > \starttexdefinition NextboxDimension
> > >    \starttabulate
> > >    \NC Width  \EQ \the\nextboxwd \NC\NR
> > >    \NC Height \NC \the\nextboxht \NC\NR
> > >    \stoptabulate
> > > \stoptexdefinition
> > > 
> > > \starttext
> > > 
> > > \dowithnextboxcs
> > >    \NextboxDimension
> > >    \vbox
> > >      {\samplefile{ward}}
> > > 
> > > \dowithnextboxcs
> > >    \NextboxDimension
> > >    \vbox
> > >      {\setupalign[flushright]
> > >       \samplefile{ward}}
> > > 
> > > \dowithnextboxcs
> > >    \NextboxDimension
> > >    \vbox
> > >      {\hsize=200pt
> > >       \samplefile{ward}}
> > > 
> > > \dowithnextboxcs
> > >    \NextboxDimension
> > >    \vbox
> > >      {\hsize=200pt
> > >       \setupalign[flushright]
> > >       \samplefile{ward}}
> > > 
> > > \stoptext
> >

> The \dowithnextbox command stores the passed argument in the named box
> \nextbox and performs the content of the first argument (or the command when
> you use \dowithnextbox*cs*).
> 
> The get the width and height of the box you can use \wd\nextbox or the
> wrapper \nextboxwd. The content of the box can be flushed with \flushnextbox
> but when you need only a copy of it you have to use \copy\nextbox.
> 
> Wolfgang
> 

Thank you very much for the example and the explanation therefore! It should
be well suitable to evaluate width and height of boxes and to pass them to
luacode programs by 'tokens.getters.macro("...")' for instance.
Thank you again!

Rudolf

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Re: How to calculate the height of text of a certain width?

[Rudolf Bahr]

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Sorry, I forgot the mentioned pdf-file.

Rudolf

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