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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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lifthrasiir

function u(t) {

x.lineWidth=5
x.globalAlpha=(3-t)/9
t<3&&x.setLineDash([t*t*9,10000])|x.arc(960,540,t*180,0,7)|x.stroke()

Mar 28 2022 4:23 PM UTC

}// 105/140

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#orbits

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TGY

remix of d/25109 by u/rep_movsd

function u(t) {

eval(unescape(escape`瑼簨圽㉥㌬娽孝⤊景爨䄽䵡瑨⹲慮摯洨⤬砮獴牯步却祬攽✣㍣䘳✬夽琪㔬砮扥杩湐慴栨⤬堽〻堼圻堫⬩砮汩湥呯⡘⭃⡙⽗⤬⡚存崽琿婛塝⬨䌨夯圩⬲⤪匨⡃⡁⩴⨳⤪琯㔩⨨堫天⨳⽗⤺〩⭙⤊砮獴牯步⠩㬠`.replace(/u([^D].)/g,'$1%')))

Mar 26 2022 9:30 PM UTC

}// 140/140

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slowdraw

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hcon

function u(t) {

c.width=1920
for(i=0;i<30;i++){x.fillStyle=R((C(i+(t*30))*1000) / 2,0, (255/30)*i)
x.fillRect((1920/30)*i,0,1920/30,1080)}

Mar 24 2022 9:31 PM UTC

}// 122/140

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Welcome to synth prison

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nicthib

function u(t) {

for(t=64;t--;)x.fillRect(t%8,~~(t/8),1,1),x.fillStyle=R(0,0,t*4)

Mar 22 2022 6:38 PM UTC

}// 64/140

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Made for 8bidou, output image has to be cropped to 8x8 at top left

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taupelink

remix of d/25108 by u/taupelink

function u(t) {

for(k=239,m=t?0:1e4;m--;x.fill())i=m%k,j=m*m%k,x.beginPath(x.fillStyle=R(l=i*j/(i+j),i^j,i|j)),x.arc(m%8*k+j,(m>>3)%5*k+i,(m-l)/k,0,3.1)

Mar 13 2022 11:45 PM UTC

}// 136/140

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d/25114

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sanco

remix of d/25061 by u/sanco

function u(t) {

for(i=99;i-=3;)for(z=99;z-=3;)x.fillRect(i*19.4+S(i+t)*19.4,z*10.91+C(z+t)*10.91,t,t),x.fillStyle=R(i*+S(t)*2,i+S(t)*2,i+C(t)*3,100);

Mar 2 2022 5:20 PM UTC

}// 133/140

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More patterns

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sanco

function u(t) {

for(i=99;i-=3;)for(z=99;z-=3;x.fillRect(i*20+S(i+t)*20,z*20+C(i*z+t)*20,t*5,t*5),x.fillStyle=R(i*+S(t)*2,i+S(t)*2,i+C(t)*3,100));

Mar 2 2022 3:15 PM UTC

}// 130/140

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Patterns

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tactical_retard

function u(t) {

s=0|t%6*20
M=Math
for(i=s*s;i--;x.fillRect(X*(a=1920/s),Y*(b=1080/s),a,b)){X=i%s
Y=0|i/s
x.fillStyle=R((X^Y)/(2**M.ceil(M.log2(s))-1)*255)}

Mar 1 2022 3:24 AM UTC

}// 139/140

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xor texture zoom with correct brightness scaling based on resolution

u/tactical_retard

brightness = (x ^ y) / (2 ** ceil(log2(s)) - 1) * 255
u/tactical_retard

More correct version: x.fillStyle=R((X^Y)/(2**(s-1?0|Math.log2(s-1)+1:1))*255). It subtracts 1 from s because the maximum value the component of a coordinate can have is s - 1 (e.g. the maximum x value for a coordinate on a 1920x1080 display is 1919). It also uses a more reliable method for getting the bit count of a number, because apparently the one in the post is quite naive. I wrote this script to test different methods and found 3 perfect ones: https://ghostbin.com/6DkSj/raw
u/tactical_retard

new link: https://pst.klgrth.io/paste/q4pvr/raw , archive: http://web.archive.org/web/20220601015945/ht…

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taupelink

remix of d/24975 by u/taupelink

function u(t) {

eval(unescape(escape`景爨洽欽㔴ㄻ洭ⴻ砮晩汬⡸⹳瑲潫攨⤩⥤㴳〪⩴Ⱳ㵭⩭╫ⱸ⹢敧楮偡瑨⡸⹦楬汓瑹汥㵒⠲〯琬搪⩴Ɽ⤩ⱸ⹡牣⠹㘰⭲⩃⡺㵭⭃⡭⭴⽤⤯搩Ⱬ⭲⩓⡺⤬洯搬洭㌬洩ⱸ⹬楮敗楤瑨㴹⽤ⱸ⹳瑲潫敓瑹汥㴧⍃㙆㤧`.replace(/u([^D].)/g,'$1%')))

Feb 27 2022 7:04 PM UTC

}// 140/140

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d/25038

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ellieeet

function u(t) {

x.fillStyle='#62f3';for(var j=0,a=Math.random()*99;j<8;j++)for(let i=0;i<9;i++)x.fillRect(C(t)*90+j*280,t*90+i*10,10,10)

Feb 23 2022 7:11 PM UTC

}// 120/140

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some sort of a 3d ribbon thingy? idk