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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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BirdsTweetCodersDweet

function u(t) {

q=30;for(X=64;X--;)for(Y=32;Y--;x.fillRect(X*q,Y*q,q,q))x.fillStyle=`hsl(${t*90+Y*q},50%,50%)`

Mar 7 2018 8:19 PM UTC

}// 94/140

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W00t

u/BirdsTweetCodersDweet

Y=36 for fullscreen

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ear7h

function u(t) {

for(i=0;i<100;i++) {
x.fillStyle = R(C(5*t*i)*255, S(2.5*t*i)*255,255, 1)
x.fillRect((t*100)%1920,i *10.8,1000,10.0)
}

Mar 6 2018 10:02 PM UTC

}// 118/140

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yokljo

function u(t) {

x.beginPath()
x.strokeStyle=R(S(t/4)*80,S(t/3)*100);
x.ellipse(0,850,(C(t*.5)+1)*960,(S(t*2)+1)*540,0,S(t*80)+1,0)
x.stroke()

Mar 6 2018 6:22 PM UTC

}// 125/140

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Was gonna add more stuff but ran out of time

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DirtyDan

remix of d/7181 by u/DirtyDan

function u(t) {

p=44/7
a=960
b=535
c.width=a*2
for(i=0;i<a;i+=10)for(j=0;j<b;j+=10)
x.fillRect(a+b*S(i/a*p+S(t))*1/S(j/b*p),b+b*S(j/b*p)*C(i/a*p+C(t)),9,9)

Mar 6 2018 3:28 AM UTC

}// 139/140

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DirtyDan

remix of d/5673 by u/DirtyDan

function u(t) {

p=11/7
a=960
b=535
c.width=a*2
for(i=0;i<a;i+=10)for(j=0;j<b;j+=10)
x.fillRect(a+b*S(i/a*p+S(t))*1/S(j/b*p),b+b*S(j/b*p)*C(i/a*p+C(t)),9,9)

Mar 6 2018 3:27 AM UTC

}// 139/140

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dwardu

remix of d/7149 by u/dwardu

function u(t) {

x[m='fillRect'](0,0,999,400);x[m](999,130,50,140)
navigator.getBattery().then(b=>x.clearRect(990,9,981*(b.level-1)*(1-t%b.charging||1),382))

Mar 5 2018 8:48 AM UTC

}// 140/140

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Battery status indicator. Works in Chrome: https://caniuse.com/#feat=battery-status

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dwardu

remix of d/7149 by u/dwardu

function u(t) {

c.width=99
x[m='fillRect'](89,18,4,9)
x.strokeRect(9,9,80,27)
navigator.getBattery().then(b=>x[m](9,9,80*b.level*(t%b.charging||1),27))

Mar 4 2018 9:55 AM UTC

}// 135/140

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Charging animation speed is now constant… and program is 5 chars shorter.

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davidsharp

remix of d/7134 by u/davidsharp

function u(t) {

m=Math,f=48,r=n=>f*m.floor(m.random()*n)
for(i=0;i++<99;)with(x)font=f+'px a',clearRect(p=r(40),q=r(22),f,f),fillText(r(10)/f,p,q+f)

Mar 2 2018 4:17 PM UTC

}// 132/140

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davidsharp

remix of d/7114 by u/dwardu

function u(t) {

m=Math,r=n=>m.floor(m.random()*n),f=48
for(i=0;i<9;i++)with(x)font=f+'px Verdana',clearRect(p=r(40)*f,q=r(22)*f,f,f),fillText(r(10),p,q+f)

Mar 2 2018 3:45 PM UTC

}// 138/140

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u/iverjo

#random

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fons

remix of d/7117 by u/dwardu

function u(t) {

x.drawImage(c,0,0,1920,1080,8+16*S(t/5)**2,t%32,w=1888,h=1048)
x.strokeStyle=R(z=2500*S(15*t)**4,z)
x.strokeRect(16,16,w,h)

Mar 1 2018 2:22 PM UTC

}// 123/140

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