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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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E-Mouse

remix of d/4826 by u/Curlip

function u(t) {

x.fillStyle="#FFF5";x.fillRect(0,0,1920,1080);x.fillStyle="#000";for(i=9;i--;)w=99*i+400+S(t)*300,x.fillRect(w,400-99*S(w/99),50,200)

Dec 30 2017 10:21 AM UTC

}// 133/140

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Golfed it down 7 bytes

u/E-Mouse

Replace 1920 with 2e3 and 1080 with 1e3 and you are down to 131 bytes

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CliffJonesJr

remix of d/4587 by u/CliffJonesJr

function u(t) {

a=Math.abs
c.width=i=48
for(;i--;)
for(j=27;j--;){z=38-a(i-24)-a(j-14)
x.fillStyle=R(S(t*z)*99,S(t*t*z)*128,S(t+z)*255)
x.fillRect(i,j,1,1)}

Dec 30 2017 6:15 AM UTC

}// 140/140

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Trigger warning!

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bobdunn

remix of d/4807 by u/bobdunn

function u(t) {

c.width=1920; /* clear the canvas */
  for(i=0;i<128;i++)
  x.fillRect(i*15 , 540 + C(2*t+(i*2))*270, 15, S(1*t+i*2)*270)

Dec 30 2017 5:04 AM UTC

}// 121/140

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bobdunn

remix of d/4765 by u/bobdunn

function u(t) {

c.width=1920; /* clear the canvas */
  for(i=0;i<128;i++)
  x.fillRect(i*15 , 540 + C(2*t+(i*2))*270, 6, S(1*t+i*2)*270)

Dec 30 2017 5:03 AM UTC

}// 120/140

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jonathan_b

remix of d/4722 by u/zkfrontman

function u(t) {

for(c.width|=i=j=1e3/2;i--;)p=t-8*i,x.fillStyle=`hsl(${p},54%,47%,1)`,x.beginPath(),x.arc(3*i+i*S(i)*S(p),j+j*S(p),5*C(p)+25,0,7),x.fill();

Dec 30 2017 4:18 AM UTC

}// 139/140

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JoshiRaez

function u(t) {

if(t%9<0.1)d=Array.from([,,,,],()=>Math.random()*100)
c.width|=0
x.font="200px G"
for(i=4;i--;)x.fillText('🚗',1620-T(t/3)*d[i],270+200*(i))

Dec 30 2017 12:31 AM UTC

}// 139/140

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mchll.bd

remix of d/2324 by u/Tiger

function u(t) {

with(x)font='950px o',lineWidth=30,strokeStyle=`hsl(${t*50%360},99%,50%)`,setLineDash([9,3e3]),lineDashOffset=t*120,strokeText('8',30,880);

Dec 30 2017 12:12 AM UTC

}// 139/140

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u/BirdsTweetCodersDweet

remix - https://www.dwitter.net/d/6642
u/davidsharp

Really like that with statement

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jaemiejaemie

remix of d/4761 by u/jaemiejaemie

function u(t) {

x.beginPath();for(Z=c.width=i=640;i--;x.lineTo(C(i/8-t)*a+320,S((i-t)/8)*a+180))a=i*i/16;x.fillRect(0,0,Z,Z),x.strokeStyle='#fff';x.stroke()

Dec 29 2017 11:54 PM UTC

}// 140/140

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xen helped me fix this, ty

u/Xen

no worries mate

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jaemiejaemie

function u(t) {

c.width=640;x.beginPath();for(i=0;i<300;i++){a=i*i/16;x.lineTo(C(i/8-t)*a+320,S((i-t)/8)*a+180);}x.strokeStyle='#000';x.stroke()

Dec 29 2017 11:38 PM UTC

}// 128/140

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futureperfect

function u(t) {

d=Math.hypot(C(t/4),S(t/4)-1+1/18);
x.fillStyle=R(255*Math.pow(.9,d),255*Math.pow(.4,d),255*Math.pow(.05,d));
x.fillRect(0,0,1920,1080);

Dec 29 2017 10:52 PM UTC

}// 137/140

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A rough model of the perceived color of the sun throughout the day, assuming the ground didn't exist and also numbers are fake.