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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: #Opposites

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zadgy5534

function u(t) {

c.width|=0;
for(i=w=2e3;i--;){
  x.fillStyle=R(u=540+i-T(i/w-t*.5)*9,v=i*T(i/w)*9,u*v);
  x.fillRect(u,v,45/w*i,15*i);
}

Sep 17 2024 11:56 AM UTC

}// 120/140

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stop and go

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zadgy5534

function u(t) {

for(i=w=c.width=2e3;i--;){
x.fillStyle=R(w%i,w/i,w-i*i);
x.fillRect(960+C(w%i^t)*T(t)*99,540+S(w/i*t)*T(t)*99,35,35);}

Sep 12 2024 10:22 AM UTC

}// 118/140

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Scaling !

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c2k

function u(t) {

c.style.filter='invert('
c.width=1980
for(i=0;i++<1e4;)x.fillRect(
900+ T(i)*100,
2100 -C(S(t*C(t+i)/2))*2000,
15,5)

Sep 12 2024 6:58 AM UTC

}// 116/140

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Making waves

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c2k

function u(t) {

MV=100;DR=5;
c.width=1980
p=(s,d)=>[(g=((s%MV)*2-d*DR)*d/2)*C(s),g*S(s)]
for(i=0;i++<1e3;){f=p(i,t*9-i);x.fillRect(900+f[0],500+f[1],15,15)}

Sep 12 2024 6:22 AM UTC

}// 140/140

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Something in the center

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ryuujin

function u(t) {

for(i=2e3;i--;)x.fillRect(960+S(i+t)*i/2,540+C(i-t)*i/2,S(i*9)**3*4,S(i*9)**3*4);x.fillStyle=`hsla(${t*50},99%,50%,.1)`

Sep 3 2024 10:43 AM UTC

}// 120/140

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u/thenize

RGB gamers go crazy!

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buddybearalex

function u(t) {

c.width = 1920
x.font=75+"px'"
for(j=0;j<100;j++) for(i=0;i<100;i++)
x.fillText('g',S(t+i)*100*j+c.width/2,C(t+i)*100*j+c.height/2)

Sep 1 2024 3:04 AM UTC

}// 131/140

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g carousel

u/gai

g
u/magna

#g

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lewdev

remix of d/32309 by u/lewdev

function u(t) {

eval(unescape(escape`景爨欽㈻欭ⴻ⥦潲⡩㴴㐻椭ⴻ⥦潲⡪㴷㭖㵴⭩⨰⸱㐳ⱕ㵃⡖⤪㘵ⱸ⹦楬汓瑹汥㵠⍠⬨⡪┲㽩┲㨨椫ㄩ┲⤿≥㕥∺≥攰∩ⱪⴭ㬩⡫㽕㰰㩕㸰⤦♸⹦楬汒散琨匨嘩⨴〰⬹㔰ⱕ⨴⬳〰⭪⨶㔬唬㘵⤠`.replace(/u([^D].)/g,'$1%')))

Aug 30 2024 10:03 PM UTC

}// 134/140

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🩷🟨 Rotating Checkerboard #carousel see the other side

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rodrigo.siqueira

remix of d/32308 by u/rodrigo.siqueira

function u(t) {

for(i=240;i--;x.fill())x.fillStyle=R(r=C(i*5+t*8)*i*4,r/3),x.beginPath(),x.arc(960+C(k=i)*(V=i*S(t+i)*S(i)*i),540+S(V)*500/T(t),2/(t%2),0,7)

Aug 30 2024 12:31 PM UTC

}// 140/140

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Flashes of a strange Universe

u/thenize

saw the other one, very nice

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lewdev

remix of d/32304 by u/lewdev

function u(t) {

for(i=44;i--;)for(j=15;V=t+i*0.143,U=C(V)*65,x.fillStyle=`#`+((j%2?i%2:(i+1)%2)?"55e":"5e5"),j--;)U>0&&x.fillRect(S(V)*800+950,U,U,U+j*65)

Aug 29 2024 9:47 PM UTC

}// 138/140

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🟦🟩 Rotating Checkerboard #carousel (golfed -24b)

u/lewdev

I also fixed a few minor issues with it and so it looks cleaner.

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mxfh

remix of d/2442 by u/mxfh

function u(t) {

c.width|=b=50
h=b-S(t)*b*5
for(e=6.28;e>0;x.lineTo(d*C(e-=~~(h%e)?.01:1/e)+h*C(s=d/b*e)+960,(d)*S(e)-h*S(s)+540))d=300-b
x.fill("evenodd")

Aug 29 2024 12:50 AM UTC

}// 138/140

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#opposites #Bouba #Kiki