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

Marco
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