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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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ersagun

function u(t) {

w=c.width=500
for(i=98;i--;)for(j=55;A=i-49,B=j-28,j--;)x.fillStyle=R((A*A+(B-S(t*2)*20)**2)*(B*B+(A-C(t)*40)**2)/w),x.fillRect(5*i,5*j,5,5)

Oct 21 2018 2:26 PM UTC

}// 140/140

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@veubeke helped trim 2 characters.

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ern0

remix of d/5117 by u/BackendForth

function u(t) {

c.width=320
for(i=0;i<49;i++){
a=C(t+i)*i*2
b=S(t+i)*i*1
x.fillRect(160+a,70+b,b/8,40)
}

Oct 18 2018 3:51 PM UTC

}// 88/140

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Simplified, preparing for native version

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jbrewhaha

remix of d/10433 by u/tomxor

function u(t) {

x.fillRect(0,0,1e4,1e4)
t+=16
n=1200
i=3768
for(;i--;)x.clearRect(
960+270 * S(i/n) / S(i+t),
540-270 * C(i/n) 
,4,4)

Oct 16 2018 4:04 PM UTC

}// 117/140

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#blackhole

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pavel

remix of d/10356 by u/pavel

function u(t) {

for(x.fillRect(0,0,X=w=c.width=600,w);X-=6;)for(r=X**2.3%w,Y=h=r*t&504;Y;x.fillText(r*Y&1,X,Y-=8))x.fillStyle=R(b=Y-h||w,250+Y-h,b)

Oct 15 2018 12:05 AM UTC

}// 131/140

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#matrix #rain v3 shorter, faster, and with variable speed droplets

u/joeytwiddle

Let the white burn briefly: b=250+(Y-h)*6

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kevlened

function u(t) {

d=new Date%2;q=d._+'';n=60;a=typeof(a)==q?0:(a+n)%1920;b=typeof(b)==q?0:a?b:b+n;x.moveTo(a+n*!d,b);x.lineTo(a+n*d,b+n);x.stroke();

Oct 14 2018 2:13 PM UTC

}// 130/140

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10 PRINT

u/ern0

I made similar for PC-DOS 256-byte https://www.youtube.com/watch?v=G1cpei7vykg

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katkip

remix of d/8236 by u/sawaxon

function u(t) {

c.width|=0;for(j=~x.translate(960,540);j++<300;)for(i=-9;i<9;x.rotate(3))x.fillStyle=R(i++*120,i*9,0),x.fillRect(j*4,T(j/9-t)*50,99,99)

Oct 5 2018 11:33 AM UTC

}// 135/140

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#portal golfed with u/prplz

u/anotherkitten

wowie this one looks nice

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SuperFromND

function u(t) {

eval(unescape(escape`爽砮捲敡瑥剡摩慬䝲慤楥湴⠱〰〬〬㈵ⰱ〰〬琪㈰〰〬㈰〰⤻愽爮慤摃潬潲却潰⹢楮搨爩㭡⠱ⱒ⠩⤻愨⸵Ⱡ桳氨㈰〬㄰〥ⰵ〥⥠⤻愨〬✣晦昧⤻砮晩汬却祬攽爻砮晩汬剥捴⠰ⰰⰲ〰〬㈰〰⤻砮摲慷䥭慧攨挬〬ㄩ`.replace(/u(..)/g,"$1%")))

Sep 26 2018 8:50 PM UTC

}// 140/140

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Doorway Thingy

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Xen

remix of d/10048 by u/katkip

function u(t) {

c.width|=w=960;h=540;for(i=74;i--;x.restore())x.save(),x.translate(w,h),x.rotate(T(3*t+i/.32-T(t)/9)/i),x.strokeRect(-(s=i*9)/2,-s/2,s,s)

Sep 23 2018 6:20 PM UTC

}// 137/140

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quick play about

u/katkip

gltichy
u/f8f82804

nice technique

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Xen

remix of d/9950 by u/anotherkitten

function u(t) {

for(i=25;i--;x.fillRect((-60+i*t*i+S(Z+t)*1e3)%2e3,0,33,2e3))x.fillStyle=R(Z=i*9,t*Z%Z,t*i%Z),x.rotate(C(i+t)/4e2)

Sep 19 2018 9:38 PM UTC

}// 114/140

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sChiab8

function u(t) {

w=c.width=1920 
for(i=0;i<(t*20%400);i++){
x.fillRect(w/2+C(i+t)*i,c.height/2+C(i)*i,10,10);}

Sep 18 2018 3:19 PM UTC

}// 94/140

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galaxy o coso