Re: [NTG-context] Metapost Animation of Sine

21 Jul 2021

      Hi, 

I wonder whether something like the following is what you are looking for:

% begin wave-sine.tex
\usemodule[animation]
\setupinteraction[state=start]
\starttext
\startTEXpage[offset=2pt]
\startanimation[menu=yes,framerate=10]
	\dorecurse{100}{\expanded
		{\startframe
		\startMPcode
			numeric u, omega, mylength, tt ;
			u := 2cm ;
			omega := 4 ;
			mylength := 3.141596 ;
			tt := \recurselevel ;
			path p ;
			p := (0u,sin(omega*(mylength/100)*tt)*u) for i = 1 upto 100 : 
							.. (((mylength/100)*i)*u,sin(omega*(mylength/100)*(i + tt))*u) 
					endfor ;
			draw p withpen pencircle scaled .5pt withcolor darkred ;
		\stopMPcode
		\stopframe}
		}
\stopanimation
\stopTEXpage
\stoptext
% end wave-sine.tex

Best regards: OK
...
On 21 Jul 2021, at 19:44, Jeroen  wrote:
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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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
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wiki     : http://contextgarden.net
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Re: [NTG-context] Metapost Animation of Sine

Otared Kavian