* Animations in ConTeXt
@ 2005-05-20 16:00 Richard Rascher-Friesenhausen
0 siblings, 0 replies; 2+ messages in thread
From: Richard Rascher-Friesenhausen @ 2005-05-20 16:00 UTC (permalink / raw)
Hello list,
i have recently found the webpage
http://www.tug.org/texshowcase/
with a lot of astonishing TeX typesettings. Most of all, because i was looking
for this, i was impressed by the animation possibilities of pdftex. See
'LorenzAttractor.tex' in the 'Dynamic documents' section. It is a LaTeX
implementation using a lot of JavaScript. Is something like this possible in
ConTeXt?
I'm aware of fieldstacks and step by step presentations. But i would like to
generate 'pdf-movies', especially for mathematical animations using MetaPost
as an graphical engine.
There exists also a 'solution' for plain TeX:
http://www.fi.muni.cz/~xholecek/animations/
But i had no success in generating the pdf-files from the sources. No
animation was shown.
So again. Is it possible to write something like the above animation packages
in ConTeXt (as a module)?
Thanks in advance
richard rascher-friesenhausen
--
==============================================================================
Richard Rascher-Friesenhausen
MeVis -- Centrum fuer Medizinische Diagnosesysteme und Visualisierung GmbH
Universitaetsallee 29
D-28359 Bremen
email: richard@mevis.de
www : http://www.mevis.de/
fon : +49 - 421 - 218 7707 (mevis)
fax : +49 - 421 - 218 4236 (mevis)
==============================================================================
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Animations in ConTeXt
@ 2005-05-22 10:19 Richard Hirsch
0 siblings, 0 replies; 2+ messages in thread
From: Richard Hirsch @ 2005-05-22 10:19 UTC (permalink / raw)
Richard Rascher-Friesenhausen asked
> So again. Is it possible to write something like the above animation
packages
> in ConTeXt (as a module)?
If Acrobat can display them, ConTeXt can generate them.
Here is a simple example.
\setupoutput [pdf]
\setupcolors [state=start]
\setupinteraction [state=start]
\setuppapersize [S6][S6]
%% this is just code to get something to animate
\startMPinclusions
picture thearrow, thestar;
drawarrow (origin--up) scaled 10mm
withpen pencircle scaled 3pt
withcolor .9 red;
setbounds currentpicture to (fullcircle scaled 22mm);
thearrow:= currentpicture scaled 5;
currentpicture:= nullpicture;
for angle=0 step 72 until 359:
draw thearrow rotated angle;
endfor
thestar:= currentpicture;
currentpicture:= nullpicture
\stopMPinclusions
\setupMPvariables [drawstar] [rotation=0]
\startuniqueMPgraphic{drawstar}{rotation}
draw thestar rotated \MPvar{rotation};
\stopuniqueMPgraphic
%% now we define some symbols (the frames of the animated sequence)
\def\definestarsymbol#1{%
\definesymbol [star #1] [\uniqueMPgraphic{drawstar}{rotation=#1}]}
\definestarsymbol{0}
\definestarsymbol{6}
\definestarsymbol{12}
\definestarsymbol{18}
\definestarsymbol{24}
\definestarsymbol{30}
\definestarsymbol{36}
\definestarsymbol{42}
\definestarsymbol{48}
\definestarsymbol{54}
\definestarsymbol{60}
\definestarsymbol{66}
%% the frames are put into a fieldstack
\definefieldstack [vortex]
[star 0, star 6, star 12, star 18, star 24, star 30,
star 36, star 42, star 48, star 54, star 60, star 66]
%% and this is the JavaScrip code that displays the frames one by one
\startJSpreamble MyField used later
var current = 1;
var delay = 200; % 200 milliseconds
var timer;
var running = false; % animation currently not running
function Advance_Angle ( ) {
this.getField("vortex:"+current).value = "Off";
if (++current > 12) % number of frames
{ current = 1; } % loop through frames
this.getField("vortex:"+current).value = "On";
}
\stopJSpreamble
%% we want to control the starting and stopping of the animation
\startJScode Rotate_Star uses MyField
if (running) {
try { app.clearInterval(timer); } catch(except) {};
running = false;
}
else {
timer = app.setInterval("Advance_Angle()",delay);
running = true;
}
\stopJScode
\starttext
\placefigure [here] [fig:animation]
{A simple \MetaFun\ animation,
click \goto {here} [JS(Rotate_Star)] to start (or stop)}
{\fieldstack [vortex]}
\stoptext
Of course you would want to put the symbol definitions and the
definition of the fieldstack into a loop. I tried
%% \newcount\angle
%% \angle=0%\zerocount
%% \dorecurse{12} {%
%% \number\angle:\qquad
%% \definestarsymbol{\the\angle}
%% \symbol[star \number\angle]\par
%% \advance\angle by 6}
and did get the single symbols. I wasn't successful however in putting
the symbol list of the fieldstack definition into a loop. Perhaps the
ConTeXt gurus can help.
Best regards,
Richard
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