[NTG-context] metafun- how to pass array as an argument

Peter Rolf indiego at gmx.net
Mon Jan 24 13:50:02 CET 2011


Am 24.01.2011 13:18, schrieb dalyoung:
> \startbuffer[a]
> path p;
> numeric bwidth, u, lastpoint; 
> u :=1cm; 
> p := fullcircle scaled .3u;
> lastpoint := 0;
> 
> def draw_balls = %(expr s)
def draw_balls(text s) =

>   draw (0,0) -- (0, u);
>   for i=3,5,0,2,1,7:
    for i=s:

> 	for j = 1 upto i:
> 	draw p shifted (lastpoint+.32*j*u,.3u);
> 	endfor;
>   bwidth := .32i*u+.5u;
>   draw (lastpoint,0) -- (lastpoint +bwidth,0) -- (lastpoint +bwidth,u);
>   lastpoint := lastpoint+bwidth;
>   endfor;
> enddef;
> 
> draw_balls;
> 
> \stopbuffer
> 
> \starttext
> \processMPbuffer[a]
> \stoptext

works in mkii, but fails in mkiv. i use an outdated version (31.12.2010)
here.


! LuaTeX error <main ctx instance>:1: attempt to call field 'feedback'
(a nil value)
stack traceback:
	<main ctx instance>:1: in main chunk.
<argument> ....feedback("\currentMPgraphicname ")}

\processMPgraphic ...ntMPgraphicformat ", \!!bs #1
                                                  ;\!!es , \!!bs
\currentMPi...
<argument> ...feedback("\currentMPgraphicname ")}}
                                                  \endMPgraphicgroup
\secondoftwoarguments #1#2->#2

l.25 \processMPbuffer[a]

?


best wishes,  Peter


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