Re: weekend upload

[Hans Hagen <j.hagen@xs4all.nl>]

On 7/9/2021 11:33 PM, Aditya Mahajan wrote:
> 
> 
> 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?
For now just use:

\setupMPvariables[list=4]

etc (grouped)

btw, i noticed that I need to reset something between graphics

Hans

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                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
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