Am 01.01.2013 um 04:50 schrieb Jeong Dal <hak...@me.com>:
> Dear Wolfgang,
>
> Thank you for the explanation, and your sample works nicely.
>
> I enclosed \processMPbuffer using \startframe and \stopframe as following.
> Then I got a 'undefined control sequence' error.
> If I use '\framed[]' instead of '\startframe … \stopframe', then it gave all
> 7 circles of different radius in two pages without error.
> If I add "\startanimation … \stopanimation", the only change is the
> appearance of menu at the bottom of the last circle.(no animation)
>
> What is wrong in the code?
1. The \frame and \startframe commands are only available *in* the animation
environment where they are locally defined.
2. Although \framed sound similar to \frame there is no relation between both
commands.
3. You have to expand the loop value *before* it is passed to metapost, see
below.
\usemodule[animation]
\setupinteraction[state=start]
\startuseMPgraphic{circles}{counter}
path p;
numeric n, u;
u := 1cm;
n:=\MPvar{counter}*u;
p := fullcircle scaled n;
draw p;
\stopuseMPgraphic
\starttext
\startanimation[menu=yes]
\dorecurse{7}{%
\startframe
\useMPgraphic{circles}{counter=#1}%
\stopframe}
\stopanimation
\stoptext
4. You can also include the metapost code in the frame but you have to expand
the \recurselevel value with the \expanded command (I have to upload a new
version of the module first because \startframe isn’t expandable yet).
\usemodule[animation]
\setupinteraction[state=start]
\starttext
\startanimation[menu=yes]
\dorecurse{7}{\expanded
{\startframe
\startMPcode
path p;
numeric n, u;
u := 1cm;
n:=\recurselevel*u;
p := fullcircle scaled n;
draw p;
\stopMPcode
\stopframe}}
\stopanimation
\stoptext
5. Use a PDF viewer with javascript support (e.g. Adobe Reader) to view the
animation.
Kind regards and a happy new year,
Wolfgang
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