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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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Xen

function u(t) {

x.beginPath(Z=250),x.arc(9e2+C(t+t*C(t/Z)+t*Z)*Z,5e2+S(t+t*C(t/Z)+t*Z)*Z,Z,0,7),x.stroke(),x.strokeStyle=R(z=t*Z%Z,Z*T(z),Z-z,.5)

May 17 2018 6:42 PM UTC

}// 129/140

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magna

remix of d/8067 by u/New_Core

function u(t) {

b=(X,Y,r)=>x.arc(X,Y,r,~x.beginPath(),7)&x.stroke();for(c.width|=i=389;i--;b(X-S(a=t*2+i/2)*70,Y+C(a)*70,9))b(X=i%26*80,Y=~~(i/26)*80,70)

May 10 2018 8:23 PM UTC

}// 137/140

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Wireframe mode

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trancor

remix of d/8036 by u/trancor

function u(t) {

for(c.width=i=69;i--;)for(k=39;k--;)x.fillStyle=R(0,S(j=(C(i/5-t/.8)*4+S(k/3+S(t)/.3)*S(i/20+t*2)/2)*6)*99+99,C(j)*255),x.fillRect(i,k,1,1)

May 9 2018 10:43 PM UTC

}// 139/140

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prplz

function u(t) {

c.width=-1;Q=40;for(X=W=20;X--;)for(Y=W;Y--;)X&1^Y&1&&x.fillRect(X*W-Q+t*100%Q,Y*W-Q+S(t)*200%Q,W,W)

May 7 2018 1:14 PM UTC

}// 100/140

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u/BuRRak

Nice! Looks quite similar to my dweet, d/7996 :D
u/iverjo

You just taught me that c.width=-1; actually sets the canvas width to 300. Clever!
u/BuRRak

300 is the default size of a canvas so giving a negative number will just reset it to defaults i guess
u/prplz

iverjo: I give credit to u/jylikangas for the -1 width trick
u/prplz

BuRRak: Thanks, same goal different approach :)

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cesque

function u(t) {

c.width|=0
x.font='50px consolas'
s=u+''
for(q=0;q<1920;q+=50){for(r=0;r<1080;r+=50){x.fillText(s[(t*10+q+r*7)%s.length|1-1],q,r)}}

May 7 2018 1:52 AM UTC

}// 131/140

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cesque

function u(t) {

c.width|=0
x.lineWidth=10
for(i=1;i<9;i++) {
  x.beginPath()
  x.arc(960,540,50+(i*50),t+(i*3)+S(t),t+(i*3.1)+3.6)
  x.stroke()
}

May 7 2018 1:11 AM UTC

}// 129/140

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u/firegodjr

#arc #hypnotic

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nix

function u(t) {

c.width=1920
for(i=0;i<360;i++){x.fillRect(i+960*-C(t-i)+960,
540+99*+S(i*(t/200)),
 S(t/2+i)<= 0 ?(25*S(t/2-i)):0
, +(25*C(t+i)))}

May 6 2018 9:11 PM UTC

}// 131/140

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cantelope

remix of d/7900 by u/BalintCsala

function u(t) {

for(x.fillRect(0,0,i=c.width|=W=99,i),K=t%1*W;i--+1;)x[q='clearRect'](D=i*W+K,D,W,W)
x[q](0,0,W,W,x.rotate(-K/31,x.translate(V=W*6+K,V-W)))

May 5 2018 11:34 PM UTC

}// 139/140

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inverted

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BuRRak

function u(t) {

for(i=c.width=100;i--;)for(j=56;j--;)x.fillRect(i,j,(((i+t*60)/10|0)+((j+S(t*2)*15+15)/10|0))%2,1);

May 5 2018 7:07 PM UTC

}// 99/140

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BirdsTweetCodersDweet

remix of d/7903 by u/BirdsTweetCodersDweet

function u(t) {

for(c.width|=i=450;i--;)x.fillStyle=`hsl(${t*i%200},50%,50%)`,x.fillRect(50*(i%40),(i/40|0)*99+(i%2)*50,C(t)*50-S(t),50)

May 3 2018 11:22 PM UTC

}// 120/140

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Better colours and full rows :D