Problem inserting image within MP

Problem inserting image within MP

[context]

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Hello,

this is a probably basic question, but the following code doesn't 
compile:

----
\setupbackgrounds[page][background={Bkg}]

\defineoverlay[Bkg][\useMPgraphic{Bkg}]

\startuseMPgraphic{Bkg}
   externalfigure "hacker.png";
\stopuseMPgraphic

\starttext
   Ahoj
\stoptext
----

with:

"
>> picture
! Isolated expression.
<to be read again>
;
<*>  externalfigure "hacker.png";
;
I couldn't find an `=' or `:=' after the
expression that is shown above this error message,
so I guess I'll just ignore it and carry on.
"

I just want to insert a picture from within MP code. What am I doing 
wrong?

Best regards,

Lukas

[-- Attachment #2: t.log --]
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open source     > level 1, order 1, name 'd:/Ctx-Beta/tex/texmf-context/tex/context/base/mkiv/cont-yes.mkiv'
system          > 
system          > ConTeXt  ver: 2019.04.16 08:54 MKIV beta  fmt: 2019.4.24  int: english/english
system          > 
system          > 'cont-new.mkiv' loaded
open source     > level 2, order 2, name 'd:/Ctx-Beta/tex/texmf-context/tex/context/base/mkiv/cont-new.mkiv'
system          > beware: some patches loaded from cont-new.mkiv
close source    > level 2, order 2, name 'd:/Ctx-Beta/tex/texmf-context/tex/context/base/mkiv/cont-new.mkiv'

system          > jobfiles > using path: d:\\Lukas\\ConTeXt\\Styles
system          > files > jobname 't', input 'D:\\Lukas\\Jobs\\_Px\\Present\\Px-2019\\_\\t.mkiv', result 't'
fonts           > latin modern fonts are not preloaded
languages       > language 'en' is active
open source     > level 2, order 3, name 'D://Lukas/Jobs/_Px/Present/Px-2019/_/t.mkiv'
fonts           > preloading latin modern fonts (second stage)
fonts           > 'fallback modern-designsize rm 12pt' is loaded
metapost        > initializing instance 'metafun:1' using format 'metafun' and method 'default'
metapost        > loading 'metafun' as 'd:/Ctx-Beta/tex/texmf-context/metapost/context/base/mpiv/metafun.mpiv' using method 'default'
metapost        > initializing number mode 'scaled'

tex error       > mp error on line 1 in file D://Lukas/Jobs/_Px/Present/Px-2019/_/t.mkiv:

>> picture
! Isolated expression.
<to be read again>
;
<*>  externalfigure "hacker.png";
;
I couldn't find an `=' or `:=' after the
expression that is shown above this error message,
so I guess I'll just ignore it and carry on.

[1]

 1 >>  \setupbackgrounds[page][background={Bkg}]
 2     
 3     \defineoverlay[Bkg][\useMPgraphic{Bkg}]
 4     
 5     \startuseMPgraphic{Bkg}
 6       externalfigure "hacker.png";
 7     \stopuseMPgraphic
 8     
 9     \starttext
10       Ahoj
11     \stoptext


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\setupbackgrounds[page][background={Bkg}]

\defineoverlay[Bkg][\useMPgraphic{Bkg}]

\startuseMPgraphic{Bkg}
  externalfigure "hacker.png";
\stopuseMPgraphic

\starttext
  Ahoj
\stoptext

[-- Attachment #4: Type: text/plain, Size: 493 bytes --]

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Re: Problem inserting image within MP

[Taco Hoekwater]

> On 10 Oct 2019, at 13:23, context@vivaldi.net wrote:
> 
> Hello,
> 
> this is a probably basic question, but the following code doesn't compile:
> 
> ----
> \setupbackgrounds[page][background={Bkg}]
> 
> \defineoverlay[Bkg][\useMPgraphic{Bkg}]
> 
> \startuseMPgraphic{Bkg}
>  externalfigure "hacker.png”;

Use

  draw externalfigure “hacker.png”;

Best wishes,
Taco

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___________________________________________________________________________________

Re: Problem inserting image within MP

[Aditya Mahajan]

On Thu, 10 Oct 2019, context@vivaldi.net wrote:

> Hello,
>
> this is a probably basic question, but the following code doesn't compile:
>
> ----
> \setupbackgrounds[page][background={Bkg}]
>
> \defineoverlay[Bkg][\useMPgraphic{Bkg}]
>
> \startuseMPgraphic{Bkg}
>  externalfigure "hacker.png";
> \stopuseMPgraphic
>
> \starttext
>  Ahoj
> \stoptext

Taco has already answered the question, but if you just want to insert the 
image as a background, there is no need to do so via MP. The following 
also works:

\setupexternalfigures[location={local,global,default}]
\setupbackgrounds[page][background={Bkg}]

\defineoverlay[Bkg][{\externalfigure[hacker.png][width=\overlaywidth,
height=\overlayheight]}]

\starttext
   Ahoj
\stoptext

Aditya
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maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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___________________________________________________________________________________