Re: weekend upload

[Aditya Mahajan <adityam@umich.edu>]

On Fri, 9 Jul 2021, Hans Hagen wrote:

> Hi,
> 
> This weekend upload has something new for metapost animation lovers:
> 
> \starttext
> 
> \startuseMPgraphic{demo}
>      stacking := 6;
>      fill fullcircle scaled 10cm
>          withcolor "red" ;
>    % stacking := 3;
>      stacking := 9;
>      fill fullcircle scaled 10cm shifted (3cm,0)
>          withcolor "green" ;
>      interim stacking := 4;
>      fill fullcircle scaled 10cm shifted (3cm,3cm)
>          withcolor "blue" ;
>      for i=1 upto 10 :
>          draw fullcircle scaled (i*cm)
>              withstacking 8
>              withpen      pencircle scaled 1mm
>              withcolor    "gray" ;
>      endfor ;
>      for i=1 upto 20 :
>          draw fullcircle scaled (i*cm/2)
>              withstacking (if odd(i) : i else : 5 fi)
>              withpen      pencircle scaled 2mm ;
>      endfor ;
>      draw boundingbox currentpicture
>          withpen      pencircle scaled 1pt
>          withstacking 0 ;
>      currentpicture := currentpicture xsized 15mm;
> \stopuseMPgraphic
> 
> \setupMPvariables[demo]
> 
> \startTEXpage
>      \vskip1ex
>      \hbox{\space\dorecurse{10}{\useMPgraphic{demo}{list={0,#1}}\space}}
>      \vskip1ex \nointerlineskip
>      \hbox{\space\dorecurse{10}{\useMPgraphic{demo}{list={0,1-#1}}\space}}
>      \vskip1ex
> \stopTEXpage
> 
> \stoptext
> 
> I have some more ideas but want to approach it stepwise. It bpils down 
> to the fact that one can put stuff on different 'layers' and optionally 
> flush these (by default all are flushed but the stackling order is 
> honored). An advantage is that one doesn't have to set up a graphic in 
> order (read: save pictures, flush them later on) and it is actually a 
> rather cheap extension in terms of runtime and overhead. Although I 
> could emulate it in mkiv, it is currently an LMTX only feature.
> 
> The (optional) list accepts the usual {1,2,5,7-9} kind of specification.

Very interesting. What will be the syntax to use this with \processMPbuffer and \startMPcode?

Aditya
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