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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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lionleaf

remix of d/16787 by u/KilledByAPixel

function u(t) {

c.width|=i=0
x.font='21em monospace'
'Not yet'.split('').map(c=>x.fillText(c,9+(I=i%13)*145,420+S(I+t)*99+399*(i++/13|0)))

Dec 4 2019 1:14 AM UTC

}// 122/140

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u/testerrr

test

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KilledByAPixel

function u(t) {

c.width|=0
with(x)fill(ellipse(960,540,510,160,0,0,7)),beginPath(fillStyle='#787'),fill(ellipse(960,490,500,150+C(t*=5)*50,S(t)/8,0,7))

Dec 3 2019 9:31 PM UTC

}// 135/140

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Disk

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Xen

remix of d/8648 by u/firegodjr

function u(t) {

for(c.width=i=300;i--;)x.lineTo(S(z=t-i/5)*129*C(i*(7^t/3)+t*3)+143,C(z)*79+79)
x.fill()

Dec 3 2019 5:38 PM UTC

}// 88/140

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Wonky

u/Xen

#waitforit

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mildlybean

function u(t) {

c.width|=0;for(i=-64;++i<64;)for(j=-64;++j<64;x.fillRect(i*S(t*4)*8+j*C(t*2)*8+960,(4e3-i*i-j*j)**.5*(i%2?8:-8)+540,5,5))x.fillStyle=`#f`+ i

Dec 3 2019 5:13 PM UTC

}// 140/140

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Optical Illusion

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KilledByAPixel

function u(t) {

c.width|=i=0
x.font='21em monospace'
'Is it safe to  post yet?'.split('').map(c=>x.fillText(c,9+(I=i%13)*145,420+S(I+t)*99+399*(i++/13|0)))

Dec 3 2019 6:05 AM UTC

}// 139/140

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u/metamero

hehehehehehehe
u/lionleaf

Ok, sorry for the extended downtime. Should be up and running now. Please ping me on discord if you notice any bugs
u/KilledByAPixel

#downtime

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rodrigo.siqueira

remix of d/16779 by u/Blacklink

function u(t) {

x.fillStyle=R(0,K=99,c.width|=0),x.font='3in"'
for(i=K;i--;)x.fillRect(i*20,800+S(i/8+t*8)*65,20,500)
x.fillText("🏄",K+C(t),740+C(t*8)*K)

Dec 2 2019 10:03 PM UTC

}// 137/140

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Wave surfing #sea #waves

u/KilledByAPixel

🌊🏄

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generateme

function u(t) {

for(c.width|=i=0;i<100;i++)for(j=0;j<50;j++){
  if((i+j)%16>2)x.fillRect(i*20,j*20,40*C(t+S(i*j+t/99)^2),40*S(t/11+C(t)*T(t*2+j/t)))}

Dec 2 2019 1:11 PM UTC

}// 133/140

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Glitching machine

u/generateme

Variants: i+j > i*j; %16>2 -> any other combination; %16>2 -> S(t)>0; and so on...
u/joeytwiddle

Welcome to the #glitch family
u/generateme

glitch is my second name ;)

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KilledByAPixel

remix of d/16782 by u/KilledByAPixel

function u(t) {

for(i=1e3;i--;)x.fillText(8,X+=S(Y)*9,Y+=C(X)*9)}{X=Y=6

Dec 2 2019 1:54 AM UTC

}// 55/140

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#Ant 40 speed up * 1000

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KilledByAPixel

remix of d/16781 by u/Xen

function u(t) {

x.fillText(8,X+=S(Y)*9,Y+=C(X)*9)}{X=Y=6

Dec 2 2019 1:52 AM UTC

}// 40/140

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#Ant 40 - this one lasts a long time, like hours, you think its gone, then it comes back

u/katkip

#record

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Xen

remix of d/16774 by u/tomxor

function u(t) {

x.fillText(8,X+=S(Y)*t,Y+=C(X)*t)}{X=Y=540

Dec 1 2019 11:40 PM UTC

}// 42/140

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42 thanks to tomxor

u/KilledByAPixel

👍