Double pendulum simulation #physics by Quant1um

function u(t) {

c.width=1920 // clear the canvas
for(i=0;i<9;i++)
x.fillRect(400+i*100+S(t)*300,400,50,200) // draw 50x200 rects

} // 122/140

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    u(t) is called 60 times per second.
    t: Elapsed time in seconds.
    S: Shorthand for Math.sin.
    C: Shorthand for Math.cos.
    T: Shorthand for Math.tan.
    R: Function that generates rgba-strings, usage ex.: R(255, 255, 255, 0.5)
    c: A 1920x1080 canvas.
    x: A 2D context for that canvas.

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Quant1um

function u(t) {

eval(unescape(escape`瑼簨礽稽昽㐸㜬椽樽〩㭯㵓⡤㵺⵹⤬栽椪椪昪漫匨稩⼲Ᵽ⹷楤瑨簽愽㤶〬戽㤹ⱛ〬礫㵩⬽欽⡪⩪⩦⩯ⵓ⡹⤫株䌨搩⤯⠱⭯⩯⤯昬稫㵪ⴽ栯昫欪䌨搩崮浡瀨椽㹸⹬楮敔漨愫㵓⡩⤪㌰〬戫㵃⡩⤪㌰〩⤬砮獴牯步⠩㬻`.replace(/u(..)/g,"$1%")))

Sep 16 2018 3:17 PM UTC

}// 140/140

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Double pendulum simulation #physics

Show more comments…
u/BirdsTweetCodersDweet

t||(y=z=f=487,i=j=0,x.lineWidth=5,x.globalAlpha=.02);o=S(d=z-y),h=i*i*f*o+S(z)/2,a=960,b=99,[0,y+=i+=k=(j*j*f*o-S(y)+h*C(d))/(1+o*o)/f,z+=j-=h/f+k*C(d)].map(i=>x.lineTo(a+=S(i)*300,b+=C(i)*300)),x.stroke(); this is cool...
u/iverjo

Nice
u/Quant1um

Thanks!
u/donbright

holy crow
u/donbright

how does it work??
u/Quant1um

u/donbright, https://www.myphysicslab.com/pendulum/double…


      u(t) is called 60 times per second.
      t: elapsed time in seconds.
      c: A 1920x1080 canvas.
      x: A 2D context for that canvas.
      S: Math.sin
      C: Math.cos
      T: Math.tan
      R: Generates rgba-strings, ex.: R(255, 255, 255, 0.5)

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