From: Wolfgang Schuster <schuster.wolfgang@gmail.com>
To: Hans Hagen <pragma@wxs.nl>
Cc: mailing list for ConTeXt users <ntg-context@ntg.nl>
Subject: Re: calculating with dimension unit
Date: Mon, 22 Apr 2013 12:43:19 +0200 [thread overview]
Message-ID: <769A9D3F-2491-455E-A538-897E45917E75@gmail.com> (raw)
In-Reply-To: <5174F151.8090303@wxs.nl>
Am 22.04.2013 um 10:14 schrieb Hans Hagen <pragma@wxs.nl>:
> On 4/22/2013 8:48 AM, Wolfgang Schuster wrote:
>>
>> Am 22.04.2013 um 01:13 schrieb Jan Heinen <JaHeinen@gmx.de>:
>>
>>> In a book I produced with ConTeXt last year, I did a lot of calculation to be able to change the layout dynamicaly.
>>>
>>> With the actual version of ConTeXt I can't compile the book. I have tried a lot of things today ... without success.
>>> I hope my minimal-example helps you to understand, what I want to do - and what I am doing wrong:
>>>
>>>
>>> \starttext
>>> \setupexternalfigures[location={local,global,default}]
>>>
>>> \defineexpandable\ColumnA {30mm}
>>> \defineexpandable\ColumnB {40mm}
>>> \defineexpandable\ColumnABi {\dimexpr(\ColumnA + \ColumnB)}
>>> \defineexpandable\ColumnABii {\ctxlua{context(\ColumnA + \ColumnB)}}
>>> \newdimen\ColumnABiii \ColumnABiii = \dimexpr(\ColumnA + \ColumnB)
>>
>> \definemeasure[ColumnA][30mm]
>> \definemeasure[ColumnB][40mm]
>> \definemeasure[ColumnBi][\the\dimexpr(\measure{ColumnA}+\measure{ColumnB})]
>
> FYI: \the\dimexpr... will look ahead till there's something nonexpandable, and contrary to what one expects
>
> \dimexpr(...)
>
> will not stop at the ) so, although with measures it normally goes okay, personally I always use \relax as terminator; the \relax will be eaten up so there is no interference but it guarantees to stop scanning.
AFAIR the etex already mentions it.
> (I've been wondering if we should make measured \the\dimexpr..\relax internally which can save dimexpr at the user end.)
+1
Wolfgang
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next prev parent reply other threads:[~2013-04-22 10:43 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-21 23:13 Jan Heinen
2013-04-21 23:59 ` luigi scarso
2013-04-22 6:48 ` Wolfgang Schuster
2013-04-22 8:14 ` Hans Hagen
2013-04-22 10:43 ` Wolfgang Schuster [this message]
2013-04-22 14:00 ` Aditya Mahajan
2013-04-22 8:23 ` Hans Hagen
2013-04-22 11:31 Jan Heinen
2013-04-22 13:58 ` Aditya Mahajan
2013-04-22 14:51 ` luigi scarso
2013-04-22 21:28 Jan Heinen
2013-04-22 21:34 ` Wolfgang Schuster
2013-04-23 18:18 Jan Heinen
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