On 1/2/2022 3:12 PM, Alfredo Catalina via ntg-context wrote:
> I'm trying to use ConTeXt with Metafun to produce a map of a videogame I
> am working on. In fact I did it 9 years ago but it seems that now it
> doesn't work.
>
> I have two 32 pixels wide by 40 pixels high sprites. They are saved in
> the skysprite.png and sandsprite.png files. Since 32 = 4 x 8 and 40 = 5
> x 8, the width/height ratio is 4/5.
>
> This should produce a page with a sky sprite and a sand sprite, one
> below the other. It worked in the past. Each sprite should be 4 x 0.095
> cm = 0,38 cm wide and 5 x 0.095 cm = 0.475 cm high:
>
> \starttext
> \setupMPinstance[metafun][textstyle={\switchtobodyfont[termes,8pt]}]
> \startuseMPgraphic{mapa}
> u:=.095cm;
> draw externalfigure "./skysprite.png" xscaled 4u yscaled 5u shifted
> (0u,-0u);
> draw externalfigure "./sandsprite.png" xscaled 4u yscaled 5u shifted
> (0u,-5u);
> \stopuseMPgraphic
> \useMPgraphic{mapa}
> \stoptext
>
> But instead I got two huge sprites of 2.8 cm x 4.4 cm.
>
> Am I forgetting something?
Originally that worked because the image was always 'included' at 1 bp
and then scaled but that was (1) inaccurate and (2) a bit depending on
the image and (3) could overflow metapost.

Use xsized and ysized instead (absolute measures instead of scaling the
unknown)

Hans

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