\definemeasure / \dimexpr

\definemeasure / \dimexpr

[Henning Hraban Ramm via ntg-context]

I’m constantly struggling with dimension calculations. Is there anything 
I can read about the possibilities and limitations?

e.g. with
\definemeasure[PageWidth][132mm]
none of the following works:
\definemeasure[FlapWidth][0.8 * \measure{PageWidth}]
\definemeasure[FlapWidth][.8\measure{PageWidth}]
\definemeasure[FlapWidth][\measure{PageWidth} * 0.8]
\definemeasure[FlapWidth][\measure{PageWidth}*8/10]
\definemeasure[FlapWidth][8\measure{PageWidth}/10]

Hraban
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Re: \definemeasure / \dimexpr

[Hans Hagen via ntg-context]

On 11/3/2022 9:32 PM, Henning Hraban Ramm via ntg-context wrote:
> I’m constantly struggling with dimension calculations. Is there anything 
> I can read about the possibilities and limitations?
> 
> e.g. with
> \definemeasure[PageWidth][132mm]
> none of the following works:
> \definemeasure[FlapWidth][0.8 * \measure{PageWidth}]

use \measured (with a "d" to get a dimension)

> \definemeasure[FlapWidth][.8\measure{PageWidth}]
> \definemeasure[FlapWidth][\measure{PageWidth} * 0.8]
> \definemeasure[FlapWidth][\measure{PageWidth}*8/10]
> \definemeasure[FlapWidth][8\measure{PageWidth}/10]
> 
> Hraban
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry 
> to the Wiki!
> 
> maillist : ntg-context@ntg.nl / 
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> ___________________________________________________________________________________

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Re: \definemeasure / \dimexpr

[Henning Hraban Ramm via ntg-context]

Am 03.11.22 um 21:51 schrieb Hans Hagen via ntg-context:
> On 11/3/2022 9:32 PM, Henning Hraban Ramm via ntg-context wrote:
>> I’m constantly struggling with dimension calculations. Is there 
>> anything I can read about the possibilities and limitations?
>>
>> e.g. with
>> \definemeasure[PageWidth][132mm]
>> none of the following works:
>> \definemeasure[FlapWidth][0.8 * \measure{PageWidth}]
> 
> use \measured (with a "d" to get a dimension)

Only in expressions like that or always?

In https://source.contextgarden.net/syst-aux.mkiv
it looks like \measured returns a dimension, while \measure returns a 
string (\the\measured), is this right?

So I should use \measure{} in setup keyvals, and \measured in dim 
expressions?

Now, when I use calculated measures for a page size, I get:
"""
You can't use '\dimexpr' in horizontal mode
"""

Hraban
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Re: \definemeasure / \dimexpr

[Henning Hraban Ramm via ntg-context]

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Am 03.11.22 um 22:43 schrieb Henning Hraban Ramm via ntg-context:
> Am 03.11.22 um 21:51 schrieb Hans Hagen via ntg-context:
>> On 11/3/2022 9:32 PM, Henning Hraban Ramm via ntg-context wrote:
>>> I’m constantly struggling with dimension calculations. Is there 
>>> anything I can read about the possibilities and limitations?
>>>
>>> e.g. with
>>> \definemeasure[PageWidth][132mm]
>>> none of the following works:
>>> \definemeasure[FlapWidth][0.8 * \measure{PageWidth}]
>>
>> use \measured (with a "d" to get a dimension)
> 
> Only in expressions like that or always?
> 
> In https://source.contextgarden.net/syst-aux.mkiv
> it looks like \measured returns a dimension, while \measure returns a 
> string (\the\measured), is this right?
> 
> So I should use \measure{} in setup keyvals, and \measured in dim 
> expressions?
> 
> Now, when I use calculated measures for a page size, I get:
> """
> You can't use '\dimexpr' in horizontal mode
> """

Here’s my MWE:
"""
\definemeasure[PageWidth][132mm]

\definemeasure[FlapWidth][\measured{PageWidth} * 0.8]

\starttext

FlapWidth: \measure{FlapWidth}

\stoptext
"""

Results in:

FlapWidth: 0.0pt.8


Longer example attached.


Hraban

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Re: \definemeasure / \dimexpr

[Herbert Voss via ntg-context]

Am 04.11.22 um 11:37 schrieb Henning Hraban Ramm via ntg-context:
> Am 03.11.22 um 22:43 schrieb Henning Hraban Ramm via ntg-context:
>> Am 03.11.22 um 21:51 schrieb Hans Hagen via ntg-context:
>>> On 11/3/2022 9:32 PM, Henning Hraban Ramm via ntg-context wrote:
>>>> I’m constantly struggling with dimension calculations. Is there 
>>>> anything I can read about the possibilities and limitations?
>>>>
>>>> e.g. with
>>>> \definemeasure[PageWidth][132mm]
>>>> none of the following works:
>>>> \definemeasure[FlapWidth][0.8 * \measure{PageWidth}]
>>>
>>> use \measured (with a "d" to get a dimension)
>>
>> Only in expressions like that or always?
>>
>> In https://source.contextgarden.net/syst-aux.mkiv
>> it looks like \measured returns a dimension, while \measure returns a 
>> string (\the\measured), is this right?
>>
>> So I should use \measure{} in setup keyvals, and \measured in dim 
>> expressions?
>>
>> Now, when I use calculated measures for a page size, I get:
>> """
>> You can't use '\dimexpr' in horizontal mode
>> """
>
> Here’s my MWE:
> """
> \definemeasure[PageWidth][132mm]
>
> \definemeasure[FlapWidth][\measured{PageWidth} * 0.8]
>

\definemeasure[FlapWidth][0.8\measured{PageWidth}]


works

Herbert


> \starttext
>
> FlapWidth: \measure{FlapWidth}
>
> \stoptext
> """
>
> Results in:
>
> FlapWidth: 0.0pt.8
>
>
> Longer example attached.
>
>
> Hraban
>
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to the Wiki!
>
> maillist : ntg-context@ntg.nl / https://www.ntg.nl/mailman/listinfo/ntg-context
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> archive  : https://bitbucket.org/phg/context-mirror/commits/
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> ___________________________________________________________________________________

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Re: \definemeasure / \dimexpr

[Henning Hraban Ramm via ntg-context]

Am 04.11.22 um 11:52 schrieb Herbert Voss via ntg-context:

>> \definemeasure[FlapWidth][\measured{PageWidth} * 0.8]
> 
> \definemeasure[FlapWidth][0.8\measured{PageWidth}]
> works

Yes, thank you!

That’s why I asked for the basics in my first post – which operators can 
I use how, in which order?

In my "real work" layout, the above approach was not always possible.

I looked into “TeX by topic”, but Eijkhout shows only how to use 
\multiply and \advance. (Tried that, worked only partly.)

I was also thinking about doing the whole thing in Lua (CLD), but it’s 
mostly setups, and those are usually easier in TeX. (And I’m not sure 
how to handle dimensions in Lua.)

Hraban
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Re: \definemeasure / \dimexpr

[Henning Hraban Ramm via ntg-context]

One problem left with dimensions that I can’t reproduce in a minimal 
example:

I want to calculate the spine width of the cover from the number of 
content pages:

\useexternalfigure[CONTENT][book.pdf]
\getfiguredimensions[CONTENT]
\definemeasure[SpineWidth][2mm + (0.135mm * \noffigurepages/2)]

That works so far, if I output \measure{SpineWidth} it shows the right 
size (~42pt).

But if I use this measure in
\setlayer[width=\measure{SpineWidth}]{...}
it’s very small.
I guess \noffigurepages is 1 at that point (from another image) and I’d 
need to expand it first.

Am I right that the expansion happens only at the “execution” of 
\measure? How would I do that? \expanded\noffigurepages doesn’t work.


Another issue:

0.135mm is the paper thickness of 90 g/m² (= 0.09mm per sheet) with 1.5 
bulk. But
\definemeasure[SpineWidth][2mm + (0.09mm * 1.5 * 90)]
doesn’t work:

"""
Missing ) inserted for expression

<to be read again>

     .
<macro> \commalistcommand
     2mm + (0.09mm * 1.
     5 * \noffigurepages /2)
<macro> \measured
     #1->\dimexpr \ifcsname \??measure #1\endcsname \lastnamedcs
     \else \zeropoint \fi \relax
...
"""

I also tried 1.5sp since sp should be 1, but it didn’t help.


Hraban
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Re: \definemeasure / \dimexpr

[Wolfgang Schuster via ntg-context]

Henning Hraban Ramm via ntg-context schrieb am 13.11.2022 um 11:37:
> One problem left with dimensions that I can’t reproduce in a minimal 
> example:
>
> I want to calculate the spine width of the cover from the number of 
> content pages:
>
> \useexternalfigure[CONTENT][book.pdf]
> \getfiguredimensions[CONTENT]
> \definemeasure[SpineWidth][2mm + (0.135mm * \noffigurepages/2)]

You can try

     \expanded{\definemeasure[SpineWidth][...]}

> That works so far, if I output \measure{SpineWidth} it shows the right 
> size (~42pt).
>
> But if I use this measure in
> \setlayer[width=\measure{SpineWidth}]{...}
> it’s very small.
> I guess \noffigurepages is 1 at that point (from another image) and 
> I’d need to expand it first.
>
> Am I right that the expansion happens only at the “execution” of 
> \measure? How would I do that? \expanded\noffigurepages doesn’t work.
>
>
> Another issue:
>
> 0.135mm is the paper thickness of 90 g/m² (= 0.09mm per sheet) with 
> 1.5 bulk. But
> \definemeasure[SpineWidth][2mm + (0.09mm * 1.5 * 90)]
> doesn’t work:

You can use integers to multiply or divide a length, a float is only allowed
before a length. e.g. 1.5\scratchdimen or 1.5\dimexpr ...\relax

In your case you have to use

     \definemeasure[SpineWidth][2mm + (0.09mm * 3 * 90 / 2)]

or

     \definemeasure[SpineWidth][2mm + (0.09mm * 135)]


Wolfgang

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Re: \definemeasure / \dimexpr

[Henning Hraban Ramm via ntg-context]

Yes! Finally! Thank you, Wolfgang!

Am 13.11.22 um 13:17 schrieb Wolfgang Schuster via ntg-context:
> Henning Hraban Ramm via ntg-context schrieb am 13.11.2022 um 11:37:
>> \definemeasure[SpineWidth][2mm + (0.135mm * \noffigurepages/2)]
> 
> You can try
>      \expanded{\definemeasure[SpineWidth][...]}

Yes, that works. I could have thought of that myself.

>> \definemeasure[SpineWidth][2mm + (0.09mm * 1.5 * 90)]
>> doesn’t work:
> 
> You can use integers to multiply or divide a length, a float is only 
> allowed
> before a length. e.g. 1.5\scratchdimen or 1.5\dimexpr ...\relax
> 
> In your case you have to use
> 
>      \definemeasure[SpineWidth][2mm + (0.09mm * 3 * 90 / 2)]
> 
> or
> 
>      \definemeasure[SpineWidth][2mm + (0.09mm * 135)]

Ah, the float/int usage was the missing link.

Now I can document my calculated cover for wiki, CG journal, my book, DTK...

Hraban
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