On Sat, 7 Jul 2018 14:27:38 -0600 Alan Braslau wrote:

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).

That works indeed. Thanks. Marco

On Sun, 8 Jul 2018 10:39:52 +0200 Hans Hagen wrote:

On 7/8/2018 1:45 AM, Marco Patzer wrote:

...

On Sat, 7 Jul 2018 14:27:38 -0600 Alan Braslau wrote:

...

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).

That works indeed. Thanks. draw figure "...." ...

That's what I was looking for. Thanks. Marco

On Sun, 8 Jul 2018 11:21:55 +0200 Hans Hagen wrote:

the "externalfigure" variant is an old one that had to deal with dimensions in a way that avoids overflows

in a future context (read luatex 1.09+) we go one-pass-mp so we can have a different approach (i never wanted to add a ton of code for images) so there externalfigure will scale proportionally too

ConTeXt running on the luatex experimental branch under development indeed works with one-pass-MP calculations as opposed to the two-pass mechanism that is standard today. For documents with extensive and complicated MP graphics, this yields a huge gain. Hans is at present working out all side-effects (such as recursive MP/TeX/lua calls) and is cleaning up some old ways of doing things that date from mkii. This might seem somewhat minor but is really exciting for those who use a lot of graphics and MetaPost effects. Alan

On Sat, 7 Jul 2018 22:27:51 +0200 Hans Hagen wrote:

On 7/7/2018 8:58 PM, Marco Patzer 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 it's all in the metafun manual

No doubts about that. It's more a matter of knowing what to search for.

xsized 5cm

I tried it, same result - square image: draw externalfigure "cow" xsized 5cm; As Alan mentioned including the image with textext() works. Not as elegant, but it gets the job done. Marco