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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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meerkat

function u(t) {

c.width=1920;for(i=0;i<9;i++){x.fillRect(400+i*100+S(t)*300,400,50,200)}

Feb 22 2017 1:53 AM UTC

}// 72/140

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fufuhaaa

remix of d/725 by u/fufuhaaa

function u(t) {

c.width=2e3;r='';for(i=0,l=1;i<1e26;r+=i){m=i;i+=l;l=m}for(i=0;i<400;)x.fillRect((r[++i]*192+(t*1e4)/(1+r[++i]))%2e3,(r[++i]+r[++i])*10,9,9)

Feb 22 2017 1:40 AM UTC

}// 140/140

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This now uses two random digits for choosing vertical star positions, which eliminates those obvious white gaps.

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alexspeller

function u(t) {

c.width=1920;for(i=0;i<9;i++){x.fillRect(400+i*100+S(t)*300,400,50,200)}

Feb 22 2017 1:11 AM UTC

}// 72/140

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tbertolo

function u(t) {

let z = 200;
c.width = 1920;
x.fillRect((c.width/2)-(z*2),0,z*4,z);
x.fillRect((c.width/2)-(z/2),z,z,100+Math.abs((600*S(t))));

Feb 22 2017 12:53 AM UTC

}// 127/140

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tbertolo

function u(t) {

c.width=1920;for(i=0;i<20;i++){x.fillRect(20*i,20*i,20*i,20*i)}

Feb 22 2017 12:41 AM UTC

}// 63/140

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xxoo00

function u(t) {

c.width=1920;for(i=0;i<9;i++){x.fillRect(400+i*100+S(t)*300,400,50,200)}

Feb 21 2017 1:18 AM UTC

}// 72/140

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bakkot

function u(t) {

s='7171717';for(i=7;!t&&--i;s=s.replace(/7/g,'717371717'))q=r=0;for(a of s)a>6?x.lineTo(q+=9*C(i),r-=9*S(i)):i+=(a-2)*Math.PI/2;x.stroke()

Feb 20 2017 8:59 PM UTC

}// 139/140

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A Lindenmayer system.

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patrick

remix of d/681 by u/patrick

function u(t) {

m=Math
r=m.random
t||(i=j=0,a=r(),b=r())
for(n=999;n>0;n--){
p=j
j=a-i
i=p+m.sqrt(m.abs(b*(i+9)))*m.sign(i)        
x.fillRect(i+j,i-j,1,1)}

Feb 20 2017 10:29 AM UTC

}// 140/140

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shaneckel

function u(t) {

c.width=1920;for(i=0;i<9;i++){x.fillRect(400+i*100+S(t)*300,400,50,200)}

Feb 19 2017 10:54 PM UTC

}// 72/140

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Agreste__

remix of d/669 by u/Agreste__

function u(t) {

l=256;d=x.getImageData(0,0,l,l);for(i=0;i<l*l;i++)d.data.set([i/l,t%1*l,i%l,l],i*4);x.putImageData(d,~~(t*l)%8*ldjdjdjdj,~~(t*l/5)%4*l)

Feb 19 2017 8:34 PM UTC

}// 135/140

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