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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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davidsharp

remix of d/15910 by u/davidsharp

function u(t) {

c.width=(s=300)*3
f=(p,g=s)=>{with(x)moveTo(s,s),lineTo(s+S(p)*g,s-C(p)*g),stroke()}
with(new Date)f(getMinutes()/9.6),f(getHours()/1.9,200)

Oct 3 2019 11:53 AM UTC

}// 140/140

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clock dweet

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afs

function u(t) {

x.rotate(.001);d=t<40&&-t*10*t;x.strokeRect(1000+(S(t)*(-100+C(t)))*-3,800+(-(S(t)*30))*.6,d*2,d*2);x.rotate(S(t)/(t*t*t*t*Math.PI*10))

Oct 3 2019 10:27 AM UTC

}// 135/140

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afs

function u(t) {

x.rotate(-.001);d=t<18&&-t*100*t;x.strokeRect(360+(S(t)*(-100+C(t)))*-3,70000+(-(S(t)*30))*.2,d*2000,d*2000);x.rotate(-t/300000)

Oct 3 2019 10:11 AM UTC

}// 128/140

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afs

function u(t) {

d=t<2.2&&-t*200*t;x.strokeRect(0+(S(t)*(30+C(t)))*-3,-200+(C(t/6)*(50+C(t)*2000+S(t)*30))*.2,d*30,d);x.rotate((S(t*3)+5+(t*t*t))/200)

Oct 3 2019 9:35 AM UTC

}// 133/140

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metamero

remix of d/15869 by u/metamero

function u(t) {

localStorage.ć=" -.0123456789Mal"
localStorage.Ć="񔄽񀕎𰌅񵀳񁀿񀑎𰌄񕄴𴄽񀍎𰌃𵀳񀍀𰌃𵄳󬄽𰰌㐰살𰌌򴄴񔉍󂨈򰯥𳀰𨐓𥵻򑡔򮪒゠񀍃󗘦𘕂񒇻𿌈𠥀󓂅񔉁󂨘򰯥𳀰𨐃񁵻蕂𥇳𰢫䀰򊬤〰󪤨𰨊𔐰򨉤󩄽𰤉㌰達𰌉񔄳󨄽𰠈㐰耴𰌈𴄴"
location='/id/15879'

Oct 2 2019 11:33 PM UTC

}// 137/140

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new version of "código" with 5to1 compression : 5 chars (of 16 different values) compressed in each unicode char

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metamero

remix of d/15868 by u/metamero

function u(t) {

with(localStorage)t?i<325&&x.fill(new Path2D(ç+=ć[[...Ć][i/5|0].codePointAt(x.transform(42,0,0,42,960,540,c.width|=1))>>i++%5*4&15])):i=ç=''

Oct 2 2019 11:30 PM UTC

}// 140/140

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new path filler for "código" : parses 5to1 compressed string : uncompressed dweet

u/joeytwiddle

Clever!

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asteriskman

function u(t) {

c.width=1920
x.font='99px A'
x.fillText('🔥',960,580)
for(i=0;i<8;) 
x.fillText(['🎃','👻'][i++%2],460*C((i+t)*.8)+960,460*S((i+t)*.8)+580)

Oct 2 2019 2:28 PM UTC

}// 136/140

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Inktober Day 1

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DataMeta

remix of d/15843 by u/DataMeta

function u(t) {

s=C(t);c.style.background='#CCC';if(t<3)for(i=2e3;i--;)
x.fillStyle=R(l=i/7,l,l),x.fillRect(t*s>=0?1920-i:i,540-l*s*2,9,9)

Sep 29 2019 7:42 PM UTC

}// 122/140

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joe.m

remix of d/15836 by u/joe.m

function u(t) {

if(!t){s=[4900]}
q=s.shift()%9801
if(!u[q])s.push(q-1,q+1,q+99,q-99)
u[q]=1
x.fillRect(19*(q/99|0),10*(q%99),17,8)

Sep 29 2019 7:27 PM UTC

}// 114/140

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flood fill 2, twice as fast and twenty three bytes shorter

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DataMeta

function u(t) {

c.style.background=R(g=S(t*1.5)*255,g,g);if(t<3)for(i=1920;i--;)
x.fillStyle=R(l=i/7.5,l,l),x.fillRect(i,540-C(t)*i/5,13,13)

Sep 28 2019 4:17 PM UTC

}// 124/140

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Had this laying around. Demonstrates the #illusion in d/15823. The triangle's #gradient remains unchanged.

u/DataMeta

The center of the base of the triangle doesn't exhibit the illusion strongly since there is a constant reference color near it and it is far from the changing background.
u/iverjo

#opticalillusion