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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