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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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ftedwin

function u(t) {

M=Math;r=(l,h)=>{return M.floor(M.random()*(h-l))+l};x.font=r(30,99)+'px m';x.fillText(String.fromCharCode(r(65,91)),r(0,1960),t*r(0,100));

Aug 10 2018 2:13 AM UTC

}// 139/140

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f8f82804

remix of d/9190 by u/f8f82804

function u(t) {

x[s='fillStyle']='#0001';x[r='fillRect'](0,0,w=1920,w);for(i=a=30;z=--i*a*C(b=t/i/i);x[s]='red')x[r](w/2+3e5*S(b)*i/(d=w-z),w/4+1e3*z/d,9,9)

Aug 10 2018 12:00 AM UTC

}// 140/140

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#galaxy #trails #perspective -- had to give up the "random" starting locations to fit in a perspective transform. Using red saves a character over #fff.

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MatchaMaze

function u(t) {

c.width|=0,r=960,F=(x)=>(x*r)/2+r/2
for(i=0;i<r;x.fillStyle=R(i%255,0,0,0.8),y=i++/r*3.14,x.fillRect(F(S(i*.0981+t)*S(y)),F(C(y)),10,10));

Aug 9 2018 10:18 PM UTC

}// 138/140

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u/f8f82804

#spiral #sphere

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f8f82804

remix of d/9154 by u/f8f82804

function u(t) {

for(β=s=314;β--;x.fillStyle=`hsl(${β+t}rad 90%${30*(1-(γ=C(α-1)*C(β))-γ**9)}%/${β/a}`)x.fillRect(s*S(α=β/200)*S(β)+960,s*S(α)*C(β)+s,a=53,a)

Aug 9 2018 6:09 PM UTC

}// 140/140

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Tweaked #sphere parameterization with occlusion, z-buffer and #phong #shading -- #rainbow #d3 #pbr

u/f8f82804

#blending

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Xen

remix of d/9176 by u/Xen

function u(t) {

for(x.fillRect(0,0,i=Z=2e3,Z);i--;x.fillRect(960+Z*S(i+t/99),Y=750-750*C((i/.6+t*t)%3.14),T=12-Y/99,T))x.fillStyle=R(i<1?a=.1:a=Z,a,9,a)

Aug 8 2018 10:51 PM UTC

}// 136/140

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#test

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Agnes

function u(t) {

for(c.width|=i=2;i--;)for(j=2;j--;)x.fillStyle=(j%2?'hsl(':'hsla(')+'0,100%,50%,.25'+(i%2?')':''),x.fillRect(X=960*i,Y=540*j,958,537)

Aug 8 2018 11:27 AM UTC

}// 133/140

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HSL compatibility tester: depending on how your strict your browser is, one to four of these squares will be pink (technically translucent red).

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DataMeta

remix of d/9101 by u/DataMeta

function u(t) {

for(i=1920;i--;)v=(t*60)%1080,l=((i^v)/(i&v))%360&frame,
x.fillStyle=R(l,l,l),x.fillRect(i,v,1,1)

Aug 8 2018 12:31 AM UTC

}// 97/140

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u/Xen

Worth the wait, love it!
u/katkip

That's abstract and cool!

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Xen

remix of d/9155 by u/katkip

function u(t) {

for(x.fillRect(0,0,Z=2e3,i=Z);i--;x.fillRect(i,Z*S(i+t),59*C(i+t),39))x.fillStyle=R(C(t^i)*255,255*S(i^t),i/9,i/Z/13)

Aug 7 2018 6:10 PM UTC

}// 117/140

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d0n.key

function u(t) {

if(typeof v=="undefined"){v=1;i=0}
v+=(i%2==0?-1:1)*(1/(3+2*i))
i++
if(i%2==0){
c.width*=1
x.font="99px'"
x.fillText(v*4,0,100)
}

Aug 7 2018 11:56 AM UTC

}// 129/140

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A rather dirty way of calculating PI...

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Xen

remix of d/9147 by u/Xen

function u(t) {

for(x.fillRect(0,0,Z=2e3,i=Z);i--;x.fillRect(i,Z*C(i-t*i),79,i/13))x.fillStyle=R(t*i%i,t*i%Z,i*C(Z*t/i),.01)

Aug 6 2018 7:58 PM UTC

}// 108/140

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Event Horizon.

u/joeytwiddle

#horrible
u/Xen

#1337 :-P