Am 08.02.2014 um 12:22 schrieb Jan Tosovsky <j.tosov...@email.cz>:

> On 2014-02-08 Wolfgang Schuster wrote:
>> 
>>> I haven't find any better way to extend the caption width than that
>>> negative value for narrowed text. It works, but that empty space above 
>>> looks weird
>> 
>> You have to force a certain width for your images because the width
>> of the text space depends on the width of the images. You can use
>> \framed (instead of loffset/roffset you can also set a fixed width) or
>> \simplealignedbox to set the width of the images.
>> 
>> \setupexternalfigures[location=default]
>> 
>> \defineframed[CombinationBox][frame=off,offset=none,loffset=3cm,roffset
>> =3cm]
>> 
>> \starttext
>> 
>> \startplacefigure[location={force,none}]
>>  \startcombination[nx=1,ny=2,align={last,hz,hanging},style=\itx]
>>    % first image
>>    \startcontent
>> 
>> %\simplealignedbox{11cm}{middle}{\externalfigure[cow][width=5cm]}
>>        \CombinationBox{\externalfigure[cow][width=5cm]}
>>      \stopcontent
>>      \startcaption
>>        \input{ward}
>>      \stopcaption
>>      % second image
>>    \startcontent
>> 
>> %\simplealignedbox{11cm}{middle}{\externalfigure[cow][width=5cm]}
>>        \CombinationBox{\externalfigure[cow][width=5cm]}
>>      \stopcontent
>>      \startcaption
>>        \input{ward}
>>      \stopcaption
>>  \stopcombination
>> \stopplacefigure
>> 
>> \stoptext
> 
> Thanks a lot, it is much simpler! I also like that \start \stop structure
> which makes the code more clear.
> 
> Just for future reference: CombinationBox extends the current image width
> with the fixed value. When different image widths are used in your document,
> the caption width varies as well. To keep the consistency within the
> document I've chosen that simplealignedbox instead. 

When you want a fixed width for \CombinationBox you have to change the 
definition to

  \defineframed[CombinationBox][frame=off,offset=none,width=11cm]

Wolfgang
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