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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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z3vin

remix of d/2322 by u/z3vin

function u(t) {

r=(n)=>Math.random()*n;h=w=1920;with(x)beginPath(),moveTo(0,0),lineTo(r(w),r(h)),strokeStyle='#fff',stroke(),fillRect(r(w),r(h*2.5),r(99),h)

Mar 27 2017 6:43 PM UTC

}// 140/140

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thanks @mxfh

u/donbright

never have i wished so much for a 'pause' function. cool pictures
u/z3vin

haha yes a lot of scenic moments in the city :) @donbright

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nonce

function u(t) {

Q=210+~~(t*9)*160
U=(''+u).replace(/[^Q]+/,'')
I=U.split('\n')
N=I[~~(t*9)]
E=x.font='111px monospace'
  x.fillText(N,20,Q)

Mar 26 2017 6:03 AM UTC

}// 124/140

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u/Lazy1337

#quine

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CHz

function u(t) {

c.width=1920
for(a=0;a<34;a++){for(b=0;b<20;b++){x.save()
x.translate(a*60,b*60)
x.rotate(t*(a+b+20)/10)
x.fillRect(0,0,60,60)
x.restore()}}

Mar 19 2017 11:27 PM UTC

}// 140/140

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u/katkip

#waves

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mxfh

function u(t) {

w=960,c.width=w*2
for(i=s=~~(t*60+t)%360,x.setTransform(p=Math.PI,a=p/s,0,p,w,w/2);i--;x.rect(d=s,-d/4,w,w))x.rotate(a*2)
x.fill("evenodd")

Mar 15 2017 12:19 AM UTC

}// 139/140

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seizure warning

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mxfh

function u(t) {

b=1;h=1080;w=960;for(i=l=2*w;i--;b=!b,x.fillStyle=b?"#000":"#FFF"){x.fillRect(i+b,l,2,C(i/w-1)**2**S(i/w+t)*-h+b)}x.drawImage(c,0,-1,l,h)

Mar 13 2017 4:03 AM UTC

}// 137/140

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u/recursive

Looks really good in fullscreen

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donbright

remix of d/1969 by u/jes5199

function u(t) {

c.width=2e3;g=new Float32Array(1);for(a=192;a;a--)for(b=99;b;b--){C=(a-96)*t;d=(b-54)*t;v=C*C+d*d;g[0]=v;v-g[0]>0?x.fillRect(a*9,b*9,9,9):0}

Mar 9 2017 12:43 AM UTC

}// 140/140

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animating some of jes5199 's circles-and-squares -ish patterns.

u/jes5199

cool! This particular pattern is based on this paper: http://www.cgl.uwaterloo.ca/csk/projects/ali…
u/donbright

thanks for linking that, very very interesting.
u/donbright

#Aliasing

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walsh9

remix of d/1871 by u/walsh9

function u(t) {

c.width|=Y=(d,e,a,l)=>l?(x.moveTo(d,e),x.lineTo(d+=l*9*C(a),e+=l*9*S(a)),Y(d,e,a-S(t),--l),Y(d,e,a+C(t),l)):0;Y(960,999,4.71,15),x.stroke()

Mar 4 2017 6:08 PM UTC

}// 140/140

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u/donbright

amazing how it collapses to a coma
u/donbright

comma

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lionleaf

remix of d/431 by u/lionleaf

function u(t) {

c.width=2e3;v='Avatars from gravatar!';for(i=v.length;i--;)x.font=130+S(t*5)*30+'px Arial',x.fillText(v[i],i*89,540+S(t*9+i)*20)

Feb 28 2017 12:06 AM UTC

}// 128/140

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Avatars have been added! They are fetched from gravatar.com based on your email, so register there to get one. Thanks to u/sigveseb for the implementation :)

u/lionleaf

#feature

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sfz

remix of d/1479 by u/sfz

function u(t) {

c.width=w=2e3
d=new Date
t?!(d&9)&&o.push([d%w,0,0,d%9]):o=[]
o.map(a=>(x.font=a[3]+'em ø',x.fillText('❄',a[0],a[1]+=a[2]+=a[3]*a[3]/w)))

Feb 27 2017 11:03 PM UTC

}// 137/140

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Snowflakes with gravity acceleration and parallax

u/sfz

err, depth that is, small ones fall slower as if they're further away :P
u/joeytwiddle

#snow I think it's fair to call that parallax, just vertical

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gormisdomai

function u(t) {

c.width=1920;
for(s=0;s<2000;s+=.1){
X = (0.1*T(t)*s+10)*C(s+t)
Y = (0.1*C(0.5*t)*s+10)*.8*S(s+t)
x.fillRect(960+X*30+t, 540+30*Y+t, X, Y)}

Feb 25 2017 2:12 PM UTC

}// 139/140

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"Space Folding #1"

u/Kalanchoe

amazing!
u/iverjo

+1 for the unexpected implosion