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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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taupelink

remix of d/15493 by u/taupelink

function u(t) {

d=Math.PI/180;x.font='20pt serif';f=frame%360;x.fillStyle=`hsl(${f},99%,30%)`,x.fillText(f,960+1.8*(r=200+30*(f%10))*C(f*d),540-r*S(f*d))

Aug 25 2019 6:52 PM UTC

}// 137/140

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Hues 0-359, arranged so you can see the numbers

u/DataMeta

t*60 instead of frame nets a neat result and shows the precision of frame, or that it uses floor/ceil

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taupelink

remix of d/15514 by u/pavel

function u(t) {

with(x)for(c.width|=i=7,translate(960,540);i--;fillRect(-2e3,-2,4e3,4))rotate(q=.9),beginPath(fill(arc(z=S(t+i*q)*500,0,(5e5-z*z)/1e4,0,7)))

Aug 25 2019 6:30 PM UTC

}// 140/140

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An optical non-illusion remix: The discs appear larger when they're closer to the center...because they are! ;-)

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taupelink

remix of d/15498 by u/taupelink

function u(t) {

for(i=d=e=f=1e3;i--;x.fillRect(d*z,e*z,1,1))[d,e,f]=[(r=Math.random(z=99)*z|0)/5+f*(f-r%2)*C(d/6+r*r)/3,r%11-r%2+S(T(d/6))/f,1.1**(r%3)+f/9]

Aug 25 2019 6:11 PM UTC

}// 140/140

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d/15517

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jellyedwards

remix of d/15514 by u/pavel

function u(t) {

with(x)for(c.width|=i=j=t/3|0,translate(960,540);i--;fillRect(-2e3,-2,4e3,2))rotate(q=Math.PI/j),beginPath(fill(arc(S(t+i*q)*500,0,40,0,7)))

Aug 25 2019 5:11 PM UTC

}// 140/140

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Tiny change so it grows over time

u/aleamb

great!

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BOOSH

remix of d/15514 by u/pavel

function u(t) {

with(x)for(c.width|=i=2,translate(960,540);i--;fillRect(-2e3,-2,4e3,4))rotate(q=Math.PI/22),beginPath(fill(arc(S(t+i*q)*500,0,50,0,2)))

Aug 25 2019 12:08 PM UTC

}// 135/140

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u/katkip

fail

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pavel

remix of d/15511 by u/katkip

function u(t) {

with(x)for(c.width|=i=7,translate(960,540);i--;fillRect(-2e3,-2,4e3,4))rotate(q=Math.PI/7),beginPath(fill(arc(S(t+i*q)*500,0,50,0,7)))

Aug 25 2019 2:28 AM UTC

}// 134/140

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u/aleamb

relaxing!
u/katkip

thx for more precision

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taupelink

remix of d/15512 by u/taupelink

function u(t) {

for(i=d=e=f=1e3;i--;x.fillRect(d*z|0,e*z|0,1+r%2,1+i%2))[d,e,f]=[(r=Math.random(z=99)*z|0)/5+(p=1+f)*C((q=d*3)+r/2),r%11+T(q)/p,i%7/5+1/p]

Aug 24 2019 2:40 PM UTC

}// 138/140

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taupelink

remix of d/15498 by u/taupelink

function u(t) {

for(i=d=e=f=1e3;i--;x.fillRect(d*z|0,e*z|0,1,1))[d,e,f]=[(r=Math.random(z=99)*z|0)/5+(p=1+f)*C((q=d*3)+r*r/2),r%11+T(q)/p,i%7/5+1/p]

Aug 24 2019 2:22 PM UTC

}// 132/140

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katkip

function u(t) {

c.width|=0;x.translate(z=960,540);for(i=7;i--;x.fillRect(-z,0,2e3,4))x.beginPath(),x.fill(x.arc(S(t+i*1.68/4)*500,0,50,0,7)),x.rotate(.45)

Aug 24 2019 12:27 PM UTC

}// 138/140

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That #illusion that everybody knows but not very precise because of golfing. https://media1.tenor.com/images/4ba3468dfd7f…

u/aleamb

relaxing!

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katkip

function u(t) {

eval(unescape(escape`𪑦𚀡𭀦𙠨𥀽𫁯𨱡𫁓𭁯𬡡𩱥𦰢𭁣𫐢𧐩🐽𭑮𩁥𩡩𫡥𩀩𮱔👛𧐻𩡯𬠨𪰽𜀻𥀮𫁥𫡧𭁨🀲𝐶𞱫𚰫𚑔𛡰𭑳𪀨𨁨𬱬𚀤𮰲𝀰𛑫𚡫𚡫𛰨𪰪𚠱𛠹𞐩𚠨𤰨𪰯𞐩𛱫𚱫𛰨𪰫𪰯𞐩𚑽𛀤𮰱𜀰𛐵𜀪𤰨𪰯𜠱𛐱𛠶𚑽𙐬𙁻𝀵𛑫𛰹𞑽𙐩𨀩𯐠`.replace(/uD./g,'')))

Aug 24 2019 8:18 AM UTC

}// 127/140

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Turbo colormap. Use localStorage["tcm"] (256 elements array)

u/katkip

Add localStorage.tcm = T; for (i in T) x.fillStyle = T[i], x.fillRect(i*5,0,5,2e3)
u/mildlybean

Cool!