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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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DeathBoy

function u(t) {

c.width=1920
n=19
for(i=0;i<n;i++)
{
Y=C(t*3+(i+n)%n)
x.fillStyle=R(Y*250)
x.fillRect(0+i*100,550+S(t*3+i)*300,100,Y*120)
}

Mar 14 2019 11:56 AM UTC

}// 123/140

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u/Undefined

c.width|=0;for(i=n=19;i--;)Y=C(t*3+(i+n)%n),x.fillStyle=R(Y*250),x.fillRect(0+i*99,540+S(t*3+i)*300,99,Y*120) - Golf your code, 110
u/Undefined

108 if you remove the unnecessary 0+
u/Xen

for(c.width|=i=n=98;i--;x.fillRect(i*n,540+S(t*3+i)*300,n,Y*n))x.fillStyle=R((Y=C(t*3+i+n%n))*250) 98bytes with tiny tweak

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dragon7076

function u(t) {

o=127
p=Math.PI*2/3
x.fillStyle=R(o+o*S(t),o+o*S(t-p),o+o*S(t+p))
x.fillRect(0,0,1920,1080)

Mar 12 2019 2:11 PM UTC

}// 91/140

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mathematically correct sine rainbow, replace p with 2 for approximate, but more compact, sine rainbow

Show more comments…
u/dragon7076

dang I forgot the 0.5 on 127
u/dragon7076

it's mathematically correct ¯\_(ツ)_/¯
u/dragon7076

it's not*
u/katkip

?
u/Undefined

o=127.5 p=Math.PI*2/3 c.style.background=R(o+o*S(t),o+o*S(t-p),o+o*S(t+p)) - you don't need to fill the entire screen to set a background ;)
u/katkip

Oh I understand now what's this

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dragon7076

function u(t) {

for(i=120;i--;){x.fillStyle=R(200+55*S(i+t),0,99+99*S(i+t+2));x.fillRect(811+999*S(t+i),i*9-99,910,99)}

Mar 12 2019 1:58 PM UTC

}// 103/140

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Sedictious

function u(t) {

c.width*=1
for(i=0;i<300;i++){x.fillStyle=R(100*(i%2),50+50*(i%3),200);x.fillText('⬤',S(t)*500*C(30.144*i)+960,C(3*t)*500*S(60.288*i)+540)}

Mar 10 2019 8:39 AM UTC

}// 139/140

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danny@hille.dk

remix of d/12707 by u/rsrsrs

function u(t) {

for(c.width=i=200;i--;x.rect(C(i*t/2),S(i*t/2),i,i),x.rotate(t/1e4));x.fill('evenodd')

Mar 9 2019 5:34 PM UTC

}// 86/140

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morier intended...

u/Jezza

#waitforit

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rsrsrs

remix of d/12699 by u/rsrsrs

function u(t) {

for(c.width=i=512;i-=1/8;x.fillRect(16*(X*2+Y+16),16*(X/2-Y+Z+9),6,9))X=i%8-4,Y=i/64-4,Z=S((X*X+Y*Y)/3+t),x.fillStyle=R(a=(Z+1)*+128,a,a)

Mar 9 2019 10:29 AM UTC

}// 137/140

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better gradient monochrome

u/rep_movsd

#underrated
u/ximavus

awesome

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danny@hille.dk

function u(t) {

eval(unescape(escape`景爨挮睩摴桼㵹㵰㴴〰Ɽ㵓⡴⤬愽搫瀻礭ⴻ⥦潲⡫㵹⽡ⱬ㵫⩤⭰⩃⡫⭤⤬椽㐻椭ⴻ焼儦☨攽㈪⡑⵱⤬砮晩汬却祬攽刨椥㈦♥ⰰⱩ┲㼰㩥⤬砮晩汬剥捴⡱⭬⭰ⰳ⩹ⱑ⵱ⰵ⤩⥱㵓⡤⬱⸵⩩⤪瀬儽匨搫⡩⬱⤥㐪ㄮ㔩⩰`.replace(/u(..)/g,"$1%")))

Mar 8 2019 6:59 PM UTC

}// 140/140

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almost happy with this :-/

u/Xen

looks good
u/pavel

It looks like you rediscovered something like d/1278. Very cool effect.
u/danny@hille.dk

Actually his code is way more elegant than mine:-) I had no intentions of copycatting :-(
u/joeytwiddle

#twister

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Xen

function u(t) {

for(c.width=800,i=199;i--;x.rotate(C(i*S(t/i*9))/i))x.rect(0,0,i*4,i*3);x.fill(`evenodd`)

Mar 8 2019 4:53 PM UTC

}// 89/140

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u/katkip

Pretty #massive

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Porpr

function u(t) {

c.width^=0;l=0;k=t;f=S(t);a=300+f*99;for(i=0;i<300;i++){k+=4.71+(f*S(t*0.1)*0.005);l+=i%5;a-=f;x.lineTo(660+C(k)*l+a,600+S(k)*l)}x.stroke()

Mar 6 2019 12:43 AM UTC

}// 139/140

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Rotamid

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qm3ster

remix of d/12641 by u/qm3ster

function u(t) {

t||(x.strokeStyle='#FF0')
x.filter=`hue-rotate(${t/=3}rad)`
r=540
x.beginPath()
while(r>0)x.lineTo(--r*S(t-=.01)+960,r*C(t)+540)
x.stroke()

Mar 5 2019 10:54 PM UTC

}// 139/140

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Debian. JK, it's a candy.

u/13thptr

Nice colors :o