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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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magna

remix of d/22309 by u/magna

function u(t) {

for(i=3e3;i--;x.fillRect((X*2+1-v*v)*15,Y*30,v*v*30,30))X=i%64,Y=i>>6,v=S(t*3+(Y-18)*(X-32)/39),x.fillStyle=R(v*99+99,X+S(t/2)*99&63^Y,T(t))

Mar 31 2021 5:27 AM UTC

}// 140/140

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Composite effects

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magna

remix of d/22308 by u/magna

function u(t) {

f=_=>S(t*2+(Y-18)*(X-32)/69)
for(i=3e3;i--;x.fillRect((X*2+1-v*v)*15,Y*30,v*v*30,30))v=f(X=i%64,Y=i>>6),x.fillStyle=R((v+1)*99,X^Y,Y*4,.2)

Mar 31 2021 4:48 AM UTC

}// 138/140

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magna

remix of d/22298 by u/magna

function u(t) {

f=_=>S(t*3+(Y-18)*(X-32)/99)
for(i=3e3;i--;x.fillRect((X*2+1-v*v)*15,Y*30,v*v*30,30))v=f(X=i%64,Y=i>>6),x.fillStyle=R((v+1)*99,X^Y)

Mar 31 2021 4:44 AM UTC

}// 131/140

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Xen

remix of d/22302 by u/erin

function u(t) {

for(e=c.width|=i=9,x.globalCompositeOperation='xor',x.fillRect(0,540,e,e);i--;)x.fillRect(400+i*99+S(t)*300,400+C(i+t*4)*19,50,200)

Mar 30 2021 11:17 PM UTC

}// 131/140

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tiny fix

u/erin

sick!!!
u/erin

i was trying to make it look like it was a wave
u/erin

so if anyone wants to try to make the bottom black part move with the rectangles, please try

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kian

remix of d/22295 by u/kian

function u(t) {

for(i=3e3;--i;x.fillRect(460+9*X*T(Y),-9*X*S(Y)+750,w=i/2**t,w))f=i*t,X=f*f%200,Y=X*f%4,x.fillStyle=R(q=i*(X**.3+Y<<2),q%T(X>>3)*i,q**.5,.1)

Mar 30 2021 6:42 PM UTC

}// 140/140

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between bunny hills

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taupelink

remix of d/22246 by u/taupelink

function u(t) {

for(i=k=1080;--i;x.fillRect(k+X*C(Y),k+X*S(Y),w=i/2**t,w))f=i*t,X=f*f%2e3,Y=X*f%7,x.fillStyle=R(q=i*S(S(X/k+S(Y)))/2,X/4&q,i*S(q/X-Y)/2,.2)

Mar 30 2021 6:38 PM UTC

}// 139/140

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d/22303

u/magna

WOW!

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erin

remix of d/11739 by u/katkip

function u(t) {

c.width=e=1920,x.globalCompositeOperation='xor',x.fillRect(0,540,e,e)
for(i=9;i--;)x.fillRect(400+i*100+S(t)*300,400,50,200)

Mar 30 2021 2:47 PM UTC

}// 124/140

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golf because why not, implementation is significantly more boring

u/New_Core

for(c.width|=i=9;i--;x.rect(0,540,e=2e3,e))x.rect(400+i*99+S(t)*300,400,50,200) x.fill("evenodd")

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kian

function u(t) {

for(i=2e3;--i;x.fillRect(900+9*X*C(Y),50*X**-C(X),w=i/t**t,w))f=i*t,X=f*f%99,Y=X*f%4,x.fillStyle=R(q=i*S(S(X**.5-X)*9),q%S(X)*i,i*C(X-q),.2)

Mar 30 2021 8:29 AM UTC

}// 140/140

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static scream

u/kian

Help me conjure this face 👐
u/kian

(this is a remix of #22249 by magna, that link disappeared when I deletede an intermediate dweet; just sayin' to not claim fame for something I didn't invent :) )

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kian

remix of d/22258 by u/magna

function u(t) {

f=_=>S(X*5+Y*40+t*4)
for(i=3e3;i--;
x.fillRect((X*1-v*v)*30,Y*30**1/t,v*v*16,30))
v=f(X=i%200,Y=i<<4),
x.fillStyle=`hsl(5,99%,${(v+8)*9}%`

Mar 30 2021 6:12 AM UTC

}// 138/140

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Candy Cane Wall of Futility

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magna

remix of d/22291 by u/magna

function u(t) {

f=_=>S(t+Y/5+S(X/7+t))
for(i=3e3;i--;x.fillRect((X*2+1-v*v)*15,Y*30,v*v*30,30))v=f(X=i%64,Y=i>>6),x.fillStyle=`hsl(${v*80},99%,${(v+1)*50}%`

Mar 30 2021 5:06 AM UTC

}// 140/140

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