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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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thorbear

function u(t) {

i=2e3,x.fillRect(0,0,i,i),u=v=t,d=1.4,s=400,x.globalAlpha=.01;for(;--i;)w=d*S(d*u)-S(d*v),v=d*C(d*u)+C(d*v),u=w,x.clearRect(s+s*u,s+v*s,4,4)

Jan 31 2019 9:05 PM UTC

}// 140/140

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spacetractor

u/thorbear

#attractor

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SpilledMilk

function u(t) {

f=()=>Math.random();
x.fillRect(0,0,2e3,2e3);
for(i=0;i<100;i++){for(j=0;j<10;j++){x.clearRect(20*i,100+S(t+i*50+j)*50+j*100,10,10);}}

Jan 31 2019 8:31 PM UTC

}// 134/140

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u/akm

watching this is incredibly satisfying

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SpilledMilk

function u(t) {

for(i=10;i>0;i--){for(j=10*i;j>0;j--){
  x.fillStyle=R(0,0,i*30)
  x.fillRect(960-25*i+C(t+j)*j*20*i,540-25*i-T(t+j)*j*20*i,50*i,50*i)}}

Jan 31 2019 7:23 PM UTC

}// 136/140

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Flow

u/thorbear

Mesmerising
u/f8f82804

Incredible #d3 illusion

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SMON

function u(t) {

c.width=1920;
for(i=0;i<500;i++){
x.fillRect(i*10+S(t)*200,S(t)*200+500+S(i/100+175)*9*T(0.5*S((t+Math.random()*0.3)*3))*100,5,10)
}

Jan 31 2019 7:12 PM UTC

}// 132/140

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wheeeeee

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SpilledMilk

function u(t) {

x.translate(960,540);
for(i=50;i>=0;i--){x.fillStyle=R(0,i*5,0);x.rotate(.01+i);x.fillRect(25*i*S(t),25*i,100,100)}
x.translate(-960,-540)

Jan 31 2019 7:03 PM UTC

}// 138/140

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Pit of Snakes

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rodrigo.siqueira

remix of d/12018 by u/rodrigo.siqueira

function u(t) {

a=b=t;s=2e3;x.globalAlpha=.2;for(i=s;--i;)x.fillStyle=R(a*i,9,i*b/6),
x.fillRect(1100+a*s,b*s,2,2),a=.2+.1*S(2*b)+C(2*a),b=S(a/5)+C(b)*t/12

Jan 31 2019 6:44 PM UTC

}// 139/140

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Bifurcation over chaotic maps. Feigenbaum constant may hide somewhere. #fractal

u/rodrigo.siqueira

#bifurcation

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SMON

function u(t) {

c.width=1920
for(i=0;i<200;i++){
for(j=-5;j<5;j++) {
z=S(2*t-i)
s=(z+1)*20-3*Math.abs(j)
x.fillRect(i*40,70*j+600+j*-0.2*S(-z)*100,s,s)
}
}

Jan 31 2019 6:44 PM UTC

}// 139/140

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I suck at this. :/

u/joeytwiddle

It's not bad. What you gonna do with that spare char?

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Xen

remix of d/12020 by u/SpilledMilk

function u(t) {

for(i=255;i--;x.fillRect(960,550,C(t+i)*i*4,S(t+i)*i*5))x.fillStyle=R(i*t%255,i*t%225,i,.1)

Jan 31 2019 6:38 PM UTC

}// 91/140

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Iceland_jack

function u(t) {

c.width=1520
for(i=0;i<9;i++) {
x.fillRect(400+i*100+S(t)*300,400,50,100)
x.fillRect(400+i*100+S(100 - t)*300,300,20,30)
}

Jan 31 2019 4:37 PM UTC

}// 122/140

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u/lionleaf

Nice #default remix :) Welcome!

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Iceland_jack

function u(t) {

x.fillRect(t*300,400,2,200)

Jan 31 2019 4:33 PM UTC

}// 27/140

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