Re: MetaPost Animations

[Wolfgang Schuster <wolfgang.schuster@gmail.com>]

Am 30.12.2012 um 14:19 schrieb Jeong Dal <haksan@me.com>:

> Dear Troy,
> 
> The animations are impressive and thank you for sharing the code.
> 
> In the creation of many pdf for animation, it changes the recurselevel only.
> I wonder if there is a way to make such kind of animation in ConTeXt using Wolfgang's animation module.
> Then we can include the animation in PDF output directly.
> 
> Here is my trial.
> 
> I modified it as following and got an animation. But it is only good for a few step animation.
> 
> […]
> 
> I also tried to simplify the code as following, but it just draw 10 figures not an animation.
> Is there a way to combine them as an animation?

You can use a loop to create the frames, the only thing you have to be aware is
how to access the counter loop iteration. In most cases you can get the current
iteration of the loop with \recurselevel but this doesn’t work for animation because
each frame is saved in a symbol with \definesymbol[<frame>][<code>] without
expanding the content.

To fix this you can expand the content with \expanded{\frame{… \recurselevel …}}
or simpler by using “#1” instead of \recurselevel to access the counter.

The braces around each frame as in your example are only one method to set
the content for each frame (it emulates the \startoverlay and \startcombination
input), when you use a loop you have to use \frame{…} or \startframe … \stopframe
to set the content for each frame.


Example:

\usemodule[animation]

\setupinteraction[state=start]

\starttext

\startanimation[menu=yes,framerate=10]
\dorecurse{99}
  {\startframe
   \definedfont[Mono sa 4]\twodigits{#1}%
   \stopframe}
\stopanimation

\stoptext

Wolfgang
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
archive  : http://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________