On Sat, 7 Jul 2018 20:58:40 +0200
Marco Patzer <li...@homerow.info> wrote:
> Hi!
>
> How to scale an image in MetaPost, maintaining the aspect ratio
> (without specifying the height explicitly)?
>
> Example:
>
> \setupexternalfigures [location=default]
> \starttext
> \externalfigure [cow][width=5cm]
>
> \startMPcode
> draw externalfigure "cow" scaled 5cm;
> \stopMPcode
> \stoptext
For "historic" reasons,
draw externalfigure "cow" scaled 5cm ;
normalizes the figure to a square. This will not be changed as it is a
very old feature of MetaFun.
The solution is
draw rawtextext("\externalfigure[cow]") xsized 5cm ;
where one can use xsized, ysized or xysized (taking a pair).
Alan
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