Re: [NTG-context] Metapost Animation of Sine

21 Jul 2021

      I am looking for a sine animation as the one file f.pdf on this site

http://www.12000.org/my_notes/Mathematica_animation_into_PDF_using_latex/ind...

Jeroen

Op wo 21 jul. 2021 om 17:54 schreef Fabrice L :
...
Hi,
Le 21 juill. 2021 à 10:08, Jeroen  a écrit :
I use this small animation to enlarge a circle
\usemodule[animation]
\setupinteraction[state=start]
\starttext
\startanimation[menu=yes,framerate=10]
\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
This I use to draw a sine
\starttext
\startMPcode
  draw(-90/360*1.5cm,-0.9cm) for i = -90 upto 630: ..
(i/360*1.5cm,0.9cm*(sind(i)))endfor;
\stopMPcode
\stoptext
When I put it together to animate the sine as following, it does not
entirely create the sine animation I am looking for
\usemodule[animation]
\setupinteraction[state=start]
\starttext
\startanimation[menu=yes,framerate=10]
\dorecurse{7}{\expanded
  {\startframe
    \startMPcode
    path p;
    numeric n, u;
    u := 1cm;
    n:=\recurselevel*u;
    p := (-90/360*1.5cm,-0.9cm) for i = -90 upto 630: ..
(i/360*1.5cm,0.9cm*(sind(i))) endfor shifted (n,0);
    draw p;
    \stopMPcode
    \stopframe}}
\stopanimation
\stoptext
What better way can I create a sine animation with Metapost?
Here is another way to do your animation. This is doing something, but I
guess not what you want. Could you describe what do you have in mind ?
\starttext
\dorecurse{7}{ % 3180
\startMPpage
myvariable := #1 ;
path p;
    numeric n, u;
    u := 1cm;
    n:=myvariable*u;
    p := (-90/360*1.5cm,-0.9cm) for i = -90 upto 630: ..
(i/360*1.5cm,0.9cm*(sind(i))) endfor shifted (n,0);
    draw p;
\stopMPpage
}
\stoptext
Fabrice.
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