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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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Current theme challenge: #Food

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trupples

function u(t) {

c.width|=0
for(i=N=5e2;i--;)x.fillRect(960+C(a=2.4*i+t)*1e3*(i/N-i*i/N/N)**.5,i*2,k=(S(a)*9+9),k)

Jan 6 2018 2:46 PM UTC

}// 97/140

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Just another spinning ball but this time taking inspiration from Phyllotaxis /shrug

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RomanW

function u(t) {

for(f=0,a=b=k=2.5465,z=92;f<100&&!t;f++,n='䑄䑄쳌ೌ䐠⦆䌢쨀ㇽࡤ찀팬䑎킀㏝̈㳌찳䑌묀㮻㌳㏝川ෝ'.charCodeAt(f/4)>>f%4*4&15,x.lineTo(a+=z*C(n/k),b+=z*S(n/k)))x.stroke()

Jan 4 2018 9:30 PM UTC

}// 140/140

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Each line segment can have 16 directions (4 bits). The 100 line segments are encoded in 25 UTF-16 characters. Very ego-centric result, i know, i know :)

u/sigveseb

Ooh, very nice indeed!

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eviltoad

remix of d/5509 by u/visy

function u(t) {

for(i=255;i>0;i--)
z=i+t,s=(C(t*10.+i)+i*t*0.5*S(t*i*.1)),x.fillStyle=R(i,i*C(t),i*S(s),1/T(i)),x.fillRect(960+S(z)*s, 540+C(z)*s, 5, 5)

Jan 4 2018 6:46 PM UTC

}// 136/140

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eviltoad

remix of d/5377 by u/BackendForth

function u(t) {

for(i=0;i<255;i++){x.strokeStyle=R(i*C(t),i*S(t),i)
x.beginPath()
r=79+2<<t%4
w=i+t/9
x.arc(960+r*S(w),540+r*C(w),i+i*C(t),0,7)
x.stroke()}

Jan 4 2018 6:07 PM UTC

}// 139/140

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u/donbright

oh snap!

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pewpew

function u(t) {

for(i=1;i<400;i++){
b=128-S(t)*127;s=i*0.5;l=s%(C(t)*i);x.fillStyle = R(b,s,s,0.5*(S(t*i)));x.fillRect(1920/400*i,540+C(t)*T(t*i)*200,l,l);}

Jan 4 2018 5:57 PM UTC

}// 140/140

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tatarski

function u(t) {

t*=30
z=t-1.4
x.lineWidth=t*1000
x.beginPath(0,0)
x.lineTo(960+z*S(t/13),540+z*C(t/13))
x.lineTo(960+t*S(t/13),540+t*C(t/13))
x.stroke()

Jan 4 2018 5:49 PM UTC

}// 137/140

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jonathan_b

remix of d/5339 by u/jonathan_b

function u(t) {

for(c.width|=s=i=980,q=S(t/24)/12;--i;)x.fillStyle=R(r=s*1.2*T(q),s/i,i,k=C(i+q*40+t)+1),x.fillRect(s+.5*C(i)*s*C(q*r*k),s/2+s/2*S(i),25,80)

Jan 3 2018 7:33 AM UTC

}// 140/140

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u/magna

Wow. I wasn't expecting for that to start happening.
u/iverjo

It's dancing!
u/jonathan_b

:)

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BackendForth

function u(t) {

for(i=0;i<99*t;i++){e=new Array(270)
for(j=0;j<270;j++)
{e[j]=i?(d[j]^d[j-1])|(!d[j+1]&d[j]&d[j-1]):!j
e[j]?x.fillRect(i*4,j*4,4,4):0}d=e}

Jan 3 2018 12:35 AM UTC

}// 138/140

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u/sigveseb

Rule 110?

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ellisk1

function u(t) {

d=t%1;x.fillStyle=R(t%6/6*(q=d*1e3),150-q,0,.5);x.beginPath();q+=(b=600);x.arc(b+q*C(a=6.3*Math.random()),b+q*S(a),b,e=3+a,e+.1+d);x.fill();

Jan 2 2018 10:27 PM UTC

}// 140/140

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The longer it has to fill in the better it looks!

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doof

remix of d/5063 by u/doof

function u(t) {

t||x.translate(960,540)
x.rotate(.0005)
x.drawImage(c,-960,-540,1920,1080)
x.fillStyle=`hsla(${t*60},50%,50%,.1)`
x.fillRect(-t*2,0,t*4,540)

Jan 2 2018 7:19 AM UTC

}// 140/140

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seeing stars 🤩