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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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jylikangas

function u(t) {

for(c.width=j=-1;++j<99;x.fillText(T=!j||3/7,-41,48))for(i=9;i--;x.fillRect(i*8+j+(i&2),j,W=!j*300|4+i/8,W*9))x.fillStyle=R(v=j*999,v,v,T/j)

May 1 2018 10:08 AM UTC

}// 140/140

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Capitalism poster tribute

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CocoMeister

function u(t) {

for(i=0;270>i;i++)x.fillRect(frame*T(i)+960,40*t,2,2);x.fillStyle="hsl("+2*frame*T(i)+",70%,50%)",x.rotate(3e-4*C(t))

May 1 2018 8:23 AM UTC

}// 117/140

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u/magna

Pretty!
u/katkip

#synthwave

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h1lander

function u(t) {

c.width=1920 
x.font=`bold ${260}px e`
x.fillText("Hello there",300+150*T(5*t+81),600)

Apr 30 2018 4:59 PM UTC

}// 86/140

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u/firegodjr

GENERAL KENOBI!

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stxxl

function u(t) {

c.width=1920;for(i=1;i<=50;i++){xp=C(0.1256*i)*400;y=S(0.1256*i)*400;xp=C(t)*xp+S(t)*y;y=S(t)*xp-C(t)*y;x.fillRect(960+xp,540+y,20,20)}

Apr 30 2018 2:52 PM UTC

}// 135/140

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joeytwiddle

function u(t) {

c.width=420;x.scale(25,25),i=0;for(j of '🌇🌆🌅🌉🌃🌌⛺🌄')k=4*C(6.28*i++/8-t/5)-3,x.globalAlpha=k<0?0:k,x.fillText(j,3,9)

Apr 30 2018 10:27 AM UTC

}// 114/140

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Stellar-themed serene scenes

u/lionleaf

Nice one! #emoji
u/joeytwiddle

Blurred out of the park in Chrome v83 on Linux
u/joeytwiddle

Fixed version: c.width=420;x.font="13em'",i=0;for(j of "🌇🌆🌅🌉🌃🌌⛺🌄")k=4*C(6.28*i++/8-t/5)-3,x.globalAlpha=k<0?0:k,x.fillText(j,75,185)

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prplz

function u(t) {

for(c.width|=i=9;i--;)x.fillRect(400+i*100+S(t)*300,400+S(9.42*S(t)+i%2*3.14)*30,50,200)

Apr 30 2018 3:10 AM UTC

}// 88/140

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#default

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johnbruin

function u(t) {

c.width=1920;
x.lineWidth=10;
for(j=0;j<6.28;j=j+.01) {
   x.lineTo(960+C(j*4)*C(t/15+j)*960,500+C(j*4+t/5)*400);
}
x.stroke();

Apr 29 2018 9:49 PM UTC

}// 127/140

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MrM@_S

function u(t) {

eval(unescape(escape`挮睩摴栽琿㔷㨨堽䅲牡礨儽㠩Ɐ湫敹異㵥㴾⡑⬽攮步礩嬲崦☨塛欽縭兛㉝☷嵞㴨栽㌼㰨縭兛儽ㅝ☷⤩籨⼲ⱘ嬭繫嵞㵨☽栯㈬塛縭歝帽栩⤻景爨椽䬽㠻䬥㡼籩ⴭ㭋㵾ⵋ籼㠩塛楝☲⨪縭䬦♸⹦楬汒散琨䬪㐬椪㐬㐬㐩`.replace(/u(..)/g,"$1%")))

Apr 29 2018 7:16 PM UTC

}// 140/140

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[lights On] a variation of the lights off game. To play, enter an X coordinate (keys 1-8 on the keyboard), and then a Y coordinate (keys 1-8 on the keyboard). Your objective is to fill the entire board with black squares.

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iverjo

remix of d/582 by u/iverjo

function u(t) {

t>7?(x.fillStyle='#fff',x.fillRect(278+(t|0)*90,155,15,15)):(X=S(S(t*4)*1.5),x.lineTo(960+110*X*X*X,480-546*C(t)+294*C(2*t)),x.fill())

Apr 29 2018 6:07 PM UTC

}// 134/140

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Catwoman, golfed

u/joeytwiddle

Save 18 chars with :s/fill.*Rect/clearRect/

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Agnes

remix of d/7843 by u/Agnes

function u(t) {

for(c.width|=i=9,a=C(t);i--;x.setTransform(1,0,-S(a+S(i+t)/4)/5,1,100*(4+i),400),x.fillRect(300*S(t)+25*S(i+a),200,50,-200));

Apr 29 2018 4:16 PM UTC

}// 125/140

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Really rickety default

u/Agnes

#default
u/lionleaf

This makes me slightly uncomfortable
u/donbright

hilarious