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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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d0n.key

remix of d/9150 by u/d0n.key

function u(t) {

accuracy=100000
v=1
for(i=0;i<accuracy;i++) v+=(i%2==0?-1:1)* (1/(3+2*i))
throw v*4

Aug 7 2018 12:03 PM UTC

}// 83/140

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A little less dirty implementation of the same thing

u/d0n.key

(increase the [accuracy] to fuck your browser and get somewhat accurate results)
u/katkip

Wow

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katkip

remix of d/9145 by u/Xen

function u(t) {

for(i=t*3e9%2e3|3;i--;x.fillRect(i*t,500+2*i*T(i),1,i))x.fillStyle=`hsla(${i*t/C(t)+T(i)},99%,50%,.3)`,x.strokeRect(0,0,i*9+T(t-i)/t,2e3)

Aug 6 2018 7:12 PM UTC

}// 137/140

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#remix_chain

u/katkip

The deep space lost colors.

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Xen

remix of d/9142 by u/katkip

function u(t) {

for(i=t*799%1e3|0;i--;x.fillRect(i*2,500+200*C(t),69*S(t),69*C(t)))x.fillStyle=`hsla(${i*t%i},99%,30%,.01)`,x.strokeRect(0,0,i*5,i*5)

Aug 6 2018 3:49 PM UTC

}// 133/140

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#remix_chain

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joeytwiddle

remix of d/9135 by u/katkip

function u(t) {

for(Z=1e3,i=2e3;i--;x.fillStyle=`hsla(${2e2*t},99%,66%,.02)`)
x.fillRect(Z+Z*C(i|t),500+Z*S(i+t*2),20*C(t*i),99)

Aug 6 2018 6:05 AM UTC

}// 112/140

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Hopping aboard the dweet chain train

u/katkip

#remix_chain

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katkip

remix of d/9131 by u/Xen

function u(t) {

x.globalCompositeOperation=`xor`
for(Z=1e3,i=99;i--;x.fillStyle=`hsla(${2e2*t},99%,50%,1)`)
x.fillRect(Z+Z*C(i|t),500+Z*T(i+t*2),Z/i/C(t),i)

Aug 6 2018 5:22 AM UTC

}// 140/140

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Rainbow Rain

u/katkip

#remix_chain

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katkip

remix of d/9129 by u/Xen

function u(t) {

for(Z=1e3,i=99;i--;x.fillStyle=`hsla(${i*t},99%,50%,.1)`)
x.fillRect(X=Z+Z*S(i-t*C(t/i)),Y=500+Z*T(i+t/3.7),i,i),x.strokeRect(X-t,Y+t,i,i)

Aug 5 2018 8:06 PM UTC

}// 138/140

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loni_art

remix of d/9118 by u/stiaje

function u(t) {

c.width|=x.stroke()
x.translate(960,540)
r=a=>(x.rotate(a),l=>x.fillRect(-5,-50,9,l))
r(7*t+3)(500)
r(t/17-t*7+7)(350)

Aug 5 2018 7:22 PM UTC

}// 118/140

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golfed even more via evil

u/richev

Nice lambda!

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katkip

remix of d/9123 by u/Xen

function u(t) {

for(Z=i=1e3;i--;x.fillStyle=`hsla(${t*t},99%,30%,.04)`)
x.fillRect(Z+2*Z*C(t*i),9e2+Z*T(t*i),9,i),x.rotate(T(t)/i)
t||x.translate(960,540)

Aug 5 2018 7:19 PM UTC

}// 138/140

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Plasm yummy

u/lionleaf

#sun
u/katkip

#remix_chain

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Xen

remix of d/9122 by u/katkip

function u(t) {

for(Z=i=1e3;i--;x.fillStyle=`hsla(${t*t*9},99%,40%,.01)`)
x.fillRect(Z+2*Z*C(t*i),500+Z*S(t-i),9,i),x.rotate(T(t)/4e5)

Aug 5 2018 7:05 PM UTC

}// 118/140

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magna

remix of d/9106 by u/richev

function u(t) {

with(x)for(i=300;i--;stroke())beginPath(strokeStyle=`hsl(${290-i},99%,60%`),arc(960,1080,390+i,0,7)

Aug 5 2018 4:24 AM UTC

}// 99/140

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Down to 99, to make room for clouds at both ends

u/richev

I'm very much a beginner here, and am still running out of characters :-) x.font="450px'";x.fillText('☁️ ☁️',90,1080)
u/stiaje

Instead of 1080, you can write 2e3 which is short for 2000.
u/stiaje

Or 1e3, I guess :)
u/stiaje

Also, because the dweet starts with with(x) you don't need to write x.fillText, just fillText, as long as you make sure to separate your statements with a comma instead of a semicolon!