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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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katkip

remix of d/4221 by u/Yax

function u(t) {

c.width|=0
a=300
for(i=a;i--;)
b=t/2+i,x.fillStyle=R(a,b),x.fillRect(i*7,700+a*C(C(b)),25,a/t),x.fillRect(a*5+i/T(b),a+i*S(b),25,25)

Jul 31 2018 12:49 PM UTC

}// 132/140

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Now your world is reversed

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katkip

function u(t) {

n=frame
q=n%2?200:500
d=n%2?2*t:2*t/.987654321
X=960+q*C(d),Y=540+q*S(d)
n%3?x.moveTo(X,Y):x.lineTo(X,Y)
x.stroke()
x.fillRect(X,Y,5,5)

Jul 30 2018 10:39 PM UTC

}// 135/140

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Pineapple

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trancor

remix of d/8946 by u/Xen

function u(t) {

for(i=99;i--;x.arc(1e3+C(3*t+i/5)*9,500+S(t+i/7+C(t))*19,i*12,i/6,t*i*3))x.beginPath(x.stroke()),x.strokeStyle=`hsl(${i*2+C(t)*99},99%,29%)`

Jul 28 2018 8:08 PM UTC

}// 140/140

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katkip

function u(t) {

v=3e3;x[s='fillStyle']=R(5,6,26,.43);x[r='fillRect'](0,0,v,v)
for(i=0;i<t;i+=.1){x[s]=R(v,t,T(i)*v);Z=F=>5e2+F(i*t)*i*i;x[r](Z(C),Z(S),i,t)}

Jul 28 2018 6:28 PM UTC

}// 140/140

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Agnes

remix of d/8938 by u/Xen

function u(t) {

with(x)for(filter='invert(5%)',drawImage(c,-5,-5,1930,1090),i=9;i--;)for(j=4;j--;)fillRect(400+i*99+S(t)*300-T(j*t),400+j*50+T(t*i),50,50);

Jul 27 2018 10:34 AM UTC

}// 139/140

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Glitching through the fog (feat. terrible performance)

u/Agnes

This apparently doesn't work on some browsers.

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firegodjr

remix of d/8940 by u/firegodjr

function u(t) {

F=n=>{for(i=n;i-->2;)n=n%i==0?0:n;return n>1}
for(Y=100;Y--;)for(X=100;X--;)F(X&Y)?x.fillRect(460+X*10,Y*10,10,10):0

Jul 26 2018 8:54 PM UTC

}// 116/140

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Prime Shenanigans

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WhiteCube

remix of d/8932 by u/WhiteCube

function u(t) {

c.width=1920;l=540;r=5;for(i=0;i<100;i++){x.fillStyle=R(P=250*C(t*i/l),C(P),0);x.fillRect(960+C(t)*(i+T(t))*r*r,l+T(t*i)*(t*S(i))/S(i),r,r)}

Jul 25 2018 12:34 PM UTC

}// 140/140

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whitecube-void

function u(t) {

o=400;y=t*(t*o)/6;z=t*o;x.fillStyle=R(t*30+80,t*10+80,t*100+80,1);x.font=o+'px s';x.clearRect(z+20,y-250,250,o);x.fillText('🂡',z,y,300)

Jul 25 2018 8:47 AM UTC

}// 135/140

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Xen

remix of d/8922 by u/Xen

function u(t) {

for(Y=i=555;i--;x.fillRect(C(t)*Y*C(t)+Y+C(i)*Y*C(i-t/3),S(t)*Y*S(t/5)+Y+S(i)*Y*S(i),9,29))x.fillStyle=`hsla(${t^i*t%Y},99%,${C(i)*69}%,.2)`

Jul 24 2018 7:22 PM UTC

}// 140/140

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Quick Remix

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robbyg

function u(t) {

s=44;for(i=1100;i--;)x.fillStyle=R(r=(T(i<<t*5)+1)*128,r,r),x.fillRect(i%s*s,(i/s|0)*s,s,s)

Jul 19 2018 5:25 PM UTC

}// 91/140

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