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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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New_Core

function u(t) {

for(i=60;i--;x.fillRect(935+935*S(b=t+i/5),500+500*C(b+S(i/9)),60,60))x.shadowBlur=1e3,x.shadowColor=x.fillStyle=`hsl(${i*10},99%,50%)`

Sep 15 2017 6:58 AM UTC

}// 135/140

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color inferno

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Xen

remix of d/3130 by u/3D.ceffo

function u(t) {

  for(c.width|=i=2e3;i--;)x.fillRect(i,i+i*C(i+t),t%9,C(t)*i/t)

Aug 30 2017 7:33 PM UTC

}// 63/140

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u/3D.ceffo

yes!
u/Xen

what squares? only lines ;-) hehehe
u/mmfun

really narwhalic!

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yokljo

function u(t) {

if(!t)w=c.width=203
d=x.getImageData(0,0,w,w)
for(a=w*w*3;a--;)d.data[a]?d.data[a+w*4+~(t%6)-2]=w:d.data[-~(t%w*w)]=w
x.putImageData(d,0,0)

Aug 28 2017 9:13 PM UTC

}// 139/140

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u/donbright

is this like a crazy game of life? very intersting

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tyaglot

function u(t) {

c.width=1920; 
  for(i=0;i<90;i++){
  x.fillRect(-400+i*40+S(t)*300, 400+S(i+S(t)*6)*100, 15, 200)
x.fillStyle=R(125+S(i*3)*100,233,45)
}

Aug 27 2017 12:53 PM UTC

}// 137/140

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yokljo

function u(t) {

c.width*=1;for(i=70;i--;x.fillRect(800+i*5,200+o*40,5,i>2?200:700))x.globalAlpha=o=S(t*2+i/8)*i/130+.7

Aug 26 2017 11:40 PM UTC

}// 102/140

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u/iverjo

#flag

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FireFly

function u(t) {

for(c.width|=i=N=t/2+5;i-->0;)x.lineTo(960+C(A=i/N*31.4)*500,540+S(A)*500);x.fill('evenodd')

Aug 24 2017 12:19 PM UTC

}// 92/140

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u/donbright

like magic spell

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magna

remix of d/2588 by u/magna

function u(t) {

w=c.width|=0;x.fillRect(0,0,w,w);x.clearRect(100,470,1720,140);x.fillRect(110,480,1700,120);x.clearRect(120,490,(t-(t|0))*1680,100)

Aug 24 2017 4:07 AM UTC

}// 131/140

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dweet player loader mark 2

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zgrep

remix of d/3078 by u/FireFly

function u(t) {

if(!t)for(c.width|=X=Y=i=0;i<1e5;X=i++%213,Y=i/213|0)f=m=>x.fillRect(9*X+18*m,9*Y,9,9),Math.random()<S(X/9.8)*S(Y/18)-.76&&f(0)+f(17-X%30)

Aug 21 2017 2:47 AM UTC

}// 138/140

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u/donbright

dude how?

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yokljo

function u(t) {

n=127
m=960
x.fillStyle=R(S(t*7)*n+n,C(t)*n+n,S(t*23)*n+n)
x.fillRect(C(t/Math.PI*5)*m+m,0,10,10)
x.drawImage(c,S(t),10)

Aug 20 2017 11:14 PM UTC

}// 120/140

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This was only running at 20 fps on my phone when I wrote it so results may vary

u/Galaxtone

.... Maybe add t/=3
u/Galaxtone

Looks much better with that

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leonarven

function u(t) {

for(i=w=c.width=600;a=C(t+i)*S(t/19),b=S(i/11)+C(t+i+3)*S(i/13+3)/9,i--;)x.fillRect(w/2+a*100,200+b*200,s=4-2*Math.sqrt(a**2+b**2),s)

Aug 19 2017 3:10 PM UTC

}// 133/140

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Not what I was originally doing x)