[NTG-context] fitting a picture to the available space

[Thomas A. Schmitz]

On Sep 12, 2008, at 9:14 AM, Wolfgang Schuster wrote:

> You should close the box before you want to get it's dimensions.

:-) That seems like a reasonable suggestion... I had been copy-pasting  
and adapting my code.

>
>
> \unprotect
>
> \def\????bf{@@@@bf}
>
> \presetlocalframed[\????bf]
>
> \def\boxfigure[#1][#2]%
>  {\bgroup
>   \setbox\scratchbox\hbox{\externalfigure[#1]}%
>   \!!dimena\wd\scratchbox
>   \!!dimenb\ht\scratchbox
>   \localframed
>     [\????bf]
>     [\c!strut=\v!no,
>      \c!width=8cm,
>      \c!height=6cm,
>      #2]
>     \bgroup
>     \!!dimena\dimexpr\hsize/\!!dimena\relax
>     \!!dimenb\dimexpr\vsize/\!!dimenb\relax
>     \ifdim\!!dimena>\!!dimenb
>       \externalfigure[mill][height=\vsize]
>     \else
>       \externalfigure[mill][width=\hsize]
>     \fi
>     \egroup
>   \egroup}
>
> \protect
>
> \starttext
>
> \boxfigure[mill][width=8cm,height=2cm]
>
> \boxfigure[mill][width=2cm,height=8cm]
>
> \stoptext
>
> Wolfgang

Wow, that looks good! I could adapt this to my circumstances, and it  
seems to do exactly what I want! Hans: could something like this be  
added to the core? The keywords "max fit broad" for the "factor"  
option are already taken, so what about "fill"? But I guess it only  
makes sense if we can test and adapt to the current vbox (not  
necessarily the page).

Anyway: Wolfgang, thanks a lot, this does exactly what I want!

All best

Thomas