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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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kaicarver

remix of d/649 by u/kaicarver

function u(t) {

c.width=1920;for(j=0;j<2;j++){for(i=0;i<6;i++){z=Math.round(Math.random());x.fillRect(700+j*300,280+i*100,200+100*((1-j)*z),50)}}

Feb 19 2017 5:39 PM UTC

}// 129/140

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I Ching hexagram generator, right side up

u/kaicarver

scroll up or down to display a random hexagram, then look it up here http://wengu.tartarie.com/wg/wengu.php?l=Yij…
u/kaicarver

I'd like to make the blinking less frequent, but I can't figure out how, link randomness to a segment of t?...
u/joeytwiddle

Nice! This will break your program for 90% of every second: t%1>.1?Z:0

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Run

remix of d/481 by u/New_Core

function u(t) {

c.width=600;for(i=t;i--;)x.beginPath(),x.arc(250+30*S(a=t+i%2),125+30*C(a*.8),21*(i%19),0,7),x.lineWidth=17,x.strokeStyle=R(i*8),x.stroke()

Jan 14 2017 4:48 PM UTC

}// 139/140

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u/tapgiles

A bit twitchy, isn't it? ;P

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iverjo

remix of d/170 by u/iverjo

function u(t) {

X=960+290*C(t)*T(t),Y=480+290*S(t),d=190;for(i=9;i--;)x.beginPath(),x.moveTo(X,Y),X-=d*C(t),Y-=d*S(t),x.lineTo(X,Y),d*=.5,x.stroke(),a+=.1

Jan 14 2017 4:15 PM UTC

}// 138/140

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lionleaf

remix of d/587 by u/BriSeven

function u(t) {

N=80;c.width=2e3;for(j=N;j;j--)for(i=N;i;)x.fillRect(980+S(j/N*8)*150+T(i/N*4)*99,
540+C(j/N*8)*150+C(t+i--/N*4)*300,5,5)

Jan 12 2017 9:07 PM UTC

}// 121/140

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A golfed remix which should leave some more room to play around with :)

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BriSeven

remix of d/585 by u/BriSeven

function u(t) {

m=140;x.fillStyle=R(C(h=t/2)*m+m,S(h-.5)*m+m,S(-h-.5)*m+m,.004);x.fillRect(99+t%13*m,0,4,2e3);x.drawImage(c,6*C(t*3),0,1920,1078)

Jan 5 2017 1:36 AM UTC

}// 129/140

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spoke too soon. you can push this even further

u/BriSeven

turn the opacity of the fill up to .5 to see some mad
u/iverjo

trippy ^^

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iverjo

remix of d/581 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)*.6,x.lineTo(960+512*X*X*X,480-42*(13*C(t)-7*C(2*t))),x.fill())

Jan 3 2017 11:48 AM UTC

}// 139/140

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Catwoman (wait for it)

u/iverjo

134 characters: 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())
u/BirdsTweetCodersDweet

#tagfail
u/BirdsTweetCodersDweet

.
u/BirdsTweetCodersDweet

nice dweet

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iverjo

remix of d/577 by u/iverjo

function u(t) {

X=S(S(t)*2);x.lineTo(960+512*X*X*X,480-32*(13*C(t)-5*C(2*t)-2*C(3*t)-C(4*t)),15,15);x.fill()

Jan 3 2017 10:24 AM UTC

}// 92/140

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A shield? Or a cat? Maybe a rose? There's room for more code to draw things like eyes

u/iverjo

Feel free to create a remix

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New_Core

function u(t) {

if(t<16)x.fillStyle='hsl('+t*22+',100%,50%)',x.fillRect(t*120,0,2,1080);if(t>16)x.drawImage(c,a=C(t),0,1920+a*3,1050)

Jan 2 2017 9:32 AM UTC

}// 117/140

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94 skipping prepaint x.fillStyle='hsl('+t*22+',100%,50%)';x.fillRect(t*120,0,2,2e3);x.drawImage(c,C(t),0,1920,1050)

u/New_Core

#colorshock

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BriSeven

function u(t) {

for(i=0;i<1920;i+=1){x.fillStyle=i%2?"#FFF":"#000",x.fillRect(i*4+S(t)*20,(t*t*t%(i*i))%997.997,8,8)}

Dec 25 2016 2:10 AM UTC

}// 102/140

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u/iverjo

Moiré
u/BriSeven

i actually posted this on accident looking for a cheaper way to get randomish looking numberss than Math.random()
u/iverjo

Good quest
u/iverjo

In some cases T(veryLargeConstant*x) or S(veryLargeConstant*x) can look random enough

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BriSeven

remix of d/548 by u/BriSeven

function u(t) {

for(i=750;--i;c=256)x.fillStyle=R((d=i%16*27)%c,d/19%c,d/3%c),m=i*(t+4e3)/1e3,n=10*i/200,x.fillRect(n*S(m)*30+960&2047,n*C(m)*30&1023,20,50)

Dec 23 2016 8:39 AM UTC

}// 140/140

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u/donbright

this made me lol