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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.

Try the new frontend: beta.dwitter.net
Current theme challenge: #Food

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micahcowan

function u(t) {

with(x)for(c.width|=j=50;--j;){for(i=m=28+4*j;--i;)r=25+i%2*25+45*j,lineTo(r*C(s=(1-j%2*2)*4*t/j+i*6.28/(m-2)),r*S(s))
stroke(),beginPath()}

Jul 6 2018 10:29 AM UTC

}// 140/140

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namklabs

function u(t) {

c.width=1920 // clear the canvas
for(i=0;i<c.height/20;i++)
x.fillRect(0,i*20,960+S(-t+i/10)*c.width/2,Math.max(2,Math.abs(S(t)*18)))

Jul 5 2018 10:09 PM UTC

}// 133/140

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alien

remix of d/8803 by u/alien

function u(t) {

t?1:(a=0,onkeydown=e=>a+=e.which) 
c.width=999
for(i=99;i--;){for(j=99;j--;u=S(i&j)*a){x.fillText(String.fromCharCode((9*t)^u),i*10,j*10)
}}

Jul 3 2018 9:54 PM UTC

}// 140/140

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Not working for mobile, just press a key, let it iterate and explore patterns.

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Xen

remix of d/8795 by u/DataMeta

function u(t) {

for(c.width|=i=21;i--;x.stroke())x.rotate(6.28),x.arc(960,540,356+348*S(i*t%i),t*i-t,t*i+i)

Jul 3 2018 5:41 PM UTC

}// 91/140

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Hyper Dimensional

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micahcowan

function u(t) {

c.width|=0
for(i=10;--i;)h=1+i+Math.abs(1-t%2)*6,m=d=>(h/d%2*128),x.fillStyle=R(m(4),m(2),m(1)),x.fillRect(h*100,400-100*S(h),50,200);

Jun 30 2018 5:00 AM UTC

}// 134/140

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Multi-color inchworm #default

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micahcowan

function u(t) {

c.width=1920
r=3.2*S(t)
D=C(r),U=S(r)
x.setTransform(1+9*D,U*5,0,9+D,825+200*-U,100*(D-1))
for(i=9;--i;)x.fillRect(-52.5+i*10,40,5,20)

Jun 27 2018 5:25 AM UTC

}// 134/140

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#default

u/micahcowan

I really like the way it looks if I add x.fillStyle=R((D<0)*255) after the 3rd line. But I don't think I'm up to the challenge of fitting that in.
u/magna

Here you go: d/8758

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firegodjr

remix of d/8750 by u/davidsharp

function u(t) {

c.width|=0
x.font="100px a",x.fillText([...'🕛🕐🕑🕒🕓🕔🕕🕖🕗🕘🕙🕚'][((t*10)|0)%12],1e3+800*S(-t),550+450*C(t))

Jun 26 2018 8:15 PM UTC

}// 101/140

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Golfed now a bit :)

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micahcowan

remix of d/8742 by u/micahcowan

function u(t) {

with(x)c.width=99,[6,7,9].map(u=>{F=(v,m)=>(Math.abs(m-(t*u*v)%(2*m))),beginPath(),arc(F(10,96),F(12,56),3,0,7),fillStyle=R(u**2.5),fill()})

Jun 26 2018 7:25 PM UTC

}// 140/140

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Color, more #ball s, and tiny canvas ^_^

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davidsharp

remix of d/8749 by u/davidsharp

function u(t) {

c.width|=0,s='🕛🕐🕑🕒🕓🕔🕕🕖🕗🕘🕙🕚'
with(x)font="100px a",fillText(s[0]+s[1+2*((Math.floor(t*10)%12))],1000+800*S(-t),550+450*C(t))

Jun 26 2018 4:19 PM UTC

}// 123/140

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Just mucking around

u/micahcowan

#emoji #clock

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Xen

remix of d/8617 by u/Bugsy

function u(t) {

for(n=c.width|=z=i=1e3;i--;n=i*(1+S(t)*T((i+t%t*t)+t)))x.fillRect(z+(S(i*t/z)*39/C((n+t)/i)),n,9,9)

Jun 25 2018 12:18 AM UTC

}// 99/140

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shoutz 2 bugsy!