Re: fitting a picture to the available space

["Wolfgang Schuster" <schuster.wolfgang@googlemail.com>]

On Thu, Sep 11, 2008 at 3:28 PM, Thomas A. Schmitz
<thomas.schmitz@uni-bonn.de> wrote:
>
> On Sep 11, 2008, at 10:04 AM, Thomas A. Schmitz wrote:
>
>>
>> On Sep 11, 2008, at 9:28 AM, Hans Hagen wrote:
>>
>>> \starttext
>>>
>>> \framed[width=5cm,height4cm]{\externalfigure[mill.png]
>>> [maxwidth=3cm,maxheight=4cm,width=10cm]}
>>>
>>> \stoptext
>>>
>>> seems to work
>>
>> Ah of course! I could set the width to an absurdly high number and so
>> make sure that it will always reach the maxheight/maxwidth, no matter
>> what the ratio! This seems to work, thanks a lot!
>>
>
> Alas, I spake too soon. Here is an example:
>
> \starttext
>
> \framed[frame=on,strut=no,width=8cm,height=2cm]
>  {\externalfigure[mill.png][maxwidth=8cm,maxheight=2cm,width=10cm]}
>
> \stoptext
>
> I would expect the picture to stay within the maxheight, but it doesn't.

You could write your own macros and comapre the width/height ration of the
picture with the reation of the box, is simple example is shown below.

\starttext

\start

\setbox\scratchbox\vbox{\externalfigure[mill]}

\dimen0=\wd\scratchbox
\dimen2=\ht\scratchbox

\framed[frame=on,strut=no,width=8cm,height=2cm]
  {\dimen1=\hsize \divide\dimen1 by \dimen0
   \dimen3=\vsize \divide\dimen3 by \dimen2
   \ifdim\dimen1>\dimen3
     \externalfigure[mill][height=\vsize]
   \else
     \externalfigure[mill][width=\hsize]
   \fi}

\framed[frame=on,strut=no,width=2cm,height=8cm]
  {\dimen1=\hsize \divide\dimen1 by \dimen0
   \dimen3=\vsize \divide\dimen3 by \dimen2
   \ifdim\dimen1>\dimen3
     \externalfigure[mill][height=\vsize]
   \else
     \externalfigure[mill][width=\hsize]
   \fi}

\stop

\stoptext

Wolfgang
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