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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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eviltoad

remix of d/5511 by u/eviltoad

function u(t) {

for(i=0;i<455;i++){x.strokeStyle=R(i*C(t+i),i,i*S(t-i))
x.beginPath()
r=79+2<<t%4
w=i+t/9
x.arc(i+r*S(w),i+r*C(w),i+i*C(t),0,7)
x.stroke()}

Jan 4 2018 6:37 PM UTC

}// 139/140

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visy

function u(t) {

for(i=955;i>0;i--)
z=i+t,ss=(C(t*10.+i)+i*t*0.5*S(t*i*.1)),x.fillStyle=R(i,i*2-ss*.1,i*3-ss,.1),x.fillRect(960+S(z)*ss, 540+C(z)*ss, 5, 5)

Jan 4 2018 5:58 PM UTC

}// 138/140

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u/eviltoad

interesting

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sandromiccoli

function u(t) {

x.strokeStyle=R(0,0,0,0.15)
x.beginPath()
x.moveTo(960+S(t)*250,480)
x.quadraticCurveTo(960+C(t/4)*960,480+S(t/4)*580,960,980)
x.stroke()

Jan 4 2018 4:50 PM UTC

}// 137/140

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wait for it....

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eviltoad

remix of d/5387 by u/eviltoad

function u(t) {

c.width|=f=(a,d,g,b,w,h)=>!d?0:(x.fillRect(w-=g*C(a),h-=g*S(a),5,5),[b,-b].map(_=>f(a+_,d-1,g/1.5,b,w,h)));f(1.57,13,400,1.57*S(t),960,1080)

Jan 4 2018 7:46 AM UTC

}// 140/140

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u/Xen

cool idea
u/eviltoad

^__^ Taken from other dwitters with a bit of remix actually

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robbyg

function u(t) {

for(w=c.width=2e3,a=c.d=c.d||[...Array(w)].map((x,i)=>Math.random()*w),i=0;i<w;i++)x.fillRect(a[i]+C(a[i]+t)*15,(i+t*60)%1080,5,5)

Jan 3 2018 7:12 PM UTC

}// 130/140

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eviltoad

remix of d/5386 by u/eviltoad

function u(t) {

c.width|=f=(a,d,g,b,w,h)=>!d?x.stroke():(x.lineTo(w-=g*C(a),h-=g*S(a)),[b,-b].map(_=>f(a+_,d-1,g/1.5,b,w,h)));f(1.57,9,400,5*S(t),960,1080)

Jan 3 2018 4:56 PM UTC

}// 139/140

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RomanW

remix of d/5354 by u/travisdoesmath

function u(t) {

for(i=0;i<213;i++)for(j=0;j<120;j++)'ﾇￃ￡￰ｸ＼＞／砀㰀Ḁༀ蜀쌀'.charCodeAt(j%16)>>i%16&1&&x.fillRect(i*9,j*9,9,9)

Jan 3 2018 12:13 PM UTC

}// 104/140

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u/travisdoesmath

Sweet! Of course, I saw your work *after* I posted. I was going to try and unpack your technique today, so I'm pretty happy that you did this remix
u/RomanW

very welcome!

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joeytwiddle

remix of d/4842 by u/joeytwiddle

function u(t) {

c.width=W=400;d=-2.1;e=1.9;for(l=j=t,i=3e4;i--;x.fillRect(W/2+j*W/5,W/4+l*W/9,.3,.3))k=S(d*l)+C(t)*C(j*d),m=S(e*j)+S(t)*C(l*e),j=k,l=m

Jan 3 2018 2:13 AM UTC

}// 134/140

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This version is easier to tweak. Medium: W=1e3, i=2e5 Heavy: W=2e3, i=1e6

u/joeytwiddle

Please upvote the original (where most of the work was done!)
u/joeytwiddle

by Jezza

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travistx

remix of d/5281 by u/travistx

function u(t) {

x.lineWidth=40
x.strokeStyle=`hsl(${t*60},100%,50%)`
x.beginPath()
x.arc(960,540,t%2*300,t*4,t*4+.1)
x.stroke()

Jan 2 2018 5:31 PM UTC

}// 112/140

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Blane

function u(t) {

c.width=w=1920;for(i=0;i<w/2;i++){b=1.1*(i%(w));d=9*C((t+.9*i)/2);x.fillRect(960*(1+(Math.sqrt(2e5-(b-539)*(b-539))/1e3)*S(t+.9*i)),b,d,d)}

Jan 2 2018 3:52 PM UTC

}// 139/140

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u/magna

You can use the ** operator to shorten Math.sqrt(2e5-(b-539)*(b-539))/1e3) to (2e5-(b-539)**2)**.5
u/magna

c.width=w=1920 can be shortened to: w=c.width|=0
u/magna

Golfed down to 111 chars: https://www.dwitter.net/d/5273
u/Blane

Thanks!