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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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23_Skidoo

remix of d/12160 by u/23_Skidoo

function u(t) {

x.beginPath()
for(w=i=5e2;i--;x.strokeStyle=`hsl(${S(t/7+i*i)*360},70%,${50+20*y/w}%,.08`)x.lineTo(C(i*i+t)*w*4,y=S(i/2-t)*w*2.5)
x.stroke()

Feb 5 2019 8:13 AM UTC

}// 140/140

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23_Skidoo

remix of d/12159 by u/23_Skidoo

function u(t) {

x.beginPath()
for(w=i=5e2;i--;x.strokeStyle=`hsl(${S(t+i*i)*360},70%,${60+40*y/w}%,.08`)x.lineTo(C(i*i+t)*w*4,y=S(i-t*.9)*w*2.5)
x.stroke()

Feb 5 2019 8:10 AM UTC

}// 139/140

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23_Skidoo

remix of d/12119 by u/23_Skidoo

function u(t) {

t/=s=30
for(i=2e3;i--;x.fillStyle=R(s+S(t*9+i)*10,s+C(i-t*s)*90,s+S(i*31+t)*s,.2))x.fillRect(1E3*(C(t*7+i*23)+.94),825*(C(t*9-i)+.9),s,s)

Feb 5 2019 12:57 AM UTC

}// 137/140

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f8f82804

remix of d/12080 by u/stellartux

function u(t) {

with(x)setTransform(u=30*C(w=t&&w<469?w+2.4:1),v=30*S(w),-v,u,960,540),beginPath(),fillStyle=`hsl(${t}rad 95%50%`,fill(arc(w**.5,0,1.2,0,7))

Feb 4 2019 5:33 PM UTC

}// 140/140

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#rainbow #phyllotaxis

u/f8f82804

I'd wanted to do this without any trig, using rotate() and save()/restore(), but it was about 4 bytes too long.
u/pavel

135 with(x)setTransform(30,0,0,30,960,540),rotate(w=t&&w<469?w+2.4:1),beginPath(fillStyle=hsl(${t}rad 95% 50%),fill(arc(w**.5,0,1.2,0,7))

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katkip

function u(t) {

c.width*=1;for(i=0;i++<9;)x.fillRect(400+i*100+S(t+3.14*(i*2.06))*300,400+C(t+3.1416*(i*2.06)+i*3.1416)*10,50,200)

Feb 4 2019 8:39 AM UTC

}// 114/140

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Another #collision #default

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katkip

remix of d/12107 by u/katkip

function u(t) {

c.width*=1;f=a=>{if(a>9)x.beginPath(),x.arc(950+C(a/99-t*2)*a*4,540+S(a/99-C(t)*2)*a*4,50+50*C(a/(20+C(t))*5),0,7),x.stroke(),f(a-1)}
f(900)

Feb 2 2019 5:16 PM UTC

}// 140/140

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Balloons tied #abstract

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katkip

function u(t) {

c.width*=1;for(i=760;i--;)x.lineTo(960+S(i*3.1416+S(i*2+t)/2+t/2)*700,540+S(i*S(i+t)/i*S(i*2))*500,9,9);x.stroke()

Feb 2 2019 4:27 PM UTC

}// 114/140

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#abstract

u/Xen

nice

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katkip

function u(t) {

eval(unescape(escape`挮睩摴株㴱㭦潲⡩㴹㤹㭩ⴭ㬩砮晩汬剥捴⠹㘰⭃⡩⨳⸱㐱㘫匨椫琩⨱⸴⤪㜰〬㔴〫匨椪䌨椫琩⽩⩓⡴⭩⨴⤩⨵〰ⰵⰵ⤻景爨樽㈰㭪ⴭ㬩砮晩汬剥捴⠹㈰⭓⡪⩪⨹⭴⨹⤪㌰ⰹ㘫横㐴⭓⡪⩪⭴⤪ㄲⰹ〬㈰⤻`.replace(/u(..)/g,"$1%")))

Feb 2 2019 4:22 PM UTC

}// 136/140

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#default's friction causes heat radiation! #compressed. Code: c.width*=1;for(i=999;i--;)x.fillRect(960+C(i*3.1416+S(i+t)*1.4)*700,540+S(i*C(i+t)/i*S(t+i*4))*500,5,5);for(j=20;j--;)x.fillRect(920+S(j*j*9+t*9)*30,96+j*44+S(j*j+t)*12,90,20);

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saon

remix of d/11987 by u/katkip

function u(t) {

x.globalAlpha=.1;for(i=20;i--;)for(j=20;j--;)
x.fillRect(960+S(i+t)*99*i,540+C(j+t)*99*i,10,10)

Feb 2 2019 4:11 AM UTC

}// 95/140

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butcherfly

function u(t) {

c.width=1920
for(i=0;i<19;i++) {
y=l=>S(i*100+t*l)*100+155
x.fillStyle=R(y(1),y(2),y(3))
x.fillRect(i*100,540,80,S(t*i)*400)
}

Feb 1 2019 5:04 PM UTC

}// 126/140

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