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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.

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Current theme challenge: #Food

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f8f82804

remix of d/9687 by u/f8f82804

function u(t) {

c.width=480;with(x)for(translate(w=240,99),rotate(a=S(t)),i=17;i--;stroke())lineTo(w*S(p=a*i/9+11*i-t+(i&~3)*2)/(Z=3+C(p)),w*(i&4?-.7:.7)/Z)

Oct 10 2018 7:16 PM UTC

}// 140/140

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#glitch #cube #perspective #d3

u/aleamb

great!
u/f8f82804

#wireframe

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f8f82804

remix of d/10293 by u/f8f82804

function u(t) {

with(x)for(i=c.width=320;i--;fillText('👹',155*(i?1+S(i^3*t):.4),90*(i?1+C(t-i):1.8)))i||(font='5cm a',globalCompositeOperation='xor')

Oct 10 2018 5:07 PM UTC

}// 133/140

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complex #emoji give interesting results with some #composite operations, at least in Firefox

u/f8f82804

It looks like each shape is drawn in a separate pass, which causes strange results! The only alternative would be to render the glyph to an off-screen canvas and then paint the image with appropriate compositing. This is hard to do in 140 chars!
u/f8f82804

update: on Firefox Android, the font rendering behavior is different

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f8f82804

remix of d/10293 by u/f8f82804

function u(t) {

for(i=768;i--;x.globalCompositeOperation=i?'source-over':'xor')x.fillRect(1920*Math.random(),1080*Math.random(),8,8);

Oct 10 2018 4:52 PM UTC

}// 117/140

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#twinkle #stars #waitforit

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Agnes

function u(t) {

for(c.width|=A=(a,b)=>b+Math.random()*a,i=9e3,P='';i--;)P+=(P?'L':'M')+A(50,100*(4+~~(i/1e3)+S(t)))+' '+A(200,400);x.stroke(new Path2D(P))

Oct 10 2018 10:18 AM UTC

}// 138/140

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Vowen default #default

u/magna

Smart!

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SuperFromND

remix of d/10165 by u/Purpzie

function u(t) {

eval(unescape(escape`爽弽㹍慴栮牡湤潭⠩⴮㔻砮晩汬却祬攽刨匨琪㈩⨲攲ⱃ⡴⨴⤪㉥㈬匨琪㘩⨲攲⤻砮景湴㵠⑻匨琪㤩⨲攳絰砢总砮晩汬呥硴⡴ⱴⰱ攳⤻砮摲慷䥭慧攨挬吨琪㤩⨹㤬吨琪㈩⨹㤩㭸⹧汯扡汃潭灯獩瑥佰敲慴楯渽❸潲✻`.replace(/u(..)/g,"$1%")))

Oct 10 2018 5:35 AM UTC

}// 140/140

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Mist

u/firegodjr

Incredibly stressful to look at
u/Purpzie

MY EYES

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geb

remix of d/10298 by u/geb

function u(t) {

for(i=c.width=420;i--;x.fillText('lol',99*(i?2+C(i+t%i):1),59*(i?2+C(t-i%t/9^i):3)));(font='0cm a')

Oct 9 2018 9:42 PM UTC

}// 99/140

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u/f8f82804

cool effect 👍

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geb

function u(t) {

for(i=c.width=420;i--;x.fillText('†',99*(i?2+S(i%i**i):1),99*(i?2+S(t-i%t/9):3)));(font='0cm a',globalCompositeOperation='source-atop')

Oct 9 2018 9:34 PM UTC

}// 135/140

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remix of https://www.dwitter.net/d/10293

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Purpzie

remix of d/10106 by u/Purpzie

function u(t) {

eval(unescape(escape`睩瑨⡸⥦潲⡲㵮㴾䵡瑨⹲慮摯洨⤪㔰〭㈵〫測椽㌲㭩ⴭ㭢敧楮偡瑨⡡牣⡲⠹㘰⤬爨㔴〩Ⱪ⨱㘪⠱⭓⡴⤪䌨琩⤬〬㜩ⱦ楬氨⤩⥦楬汓瑹汥㵠桳污⠤筴⨹㤫椪㥽ⰹ㤥ⰵ〥Ⱞ〱⥠`.replace(/u(..)/g,"$1%")))

Oct 9 2018 8:13 PM UTC

}// 123/140

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u/joeytwiddle

In 139, with a few compromises: with(x)for(r=Math.random,i=k=512;i-=32;beginPath(arc(704+k*r(),284+k*r(),i+i*S(t)*C(t),0,7),fill()))fillStyle=?hsla(${t*99+i},99%,50%,.01)?
u/Purpzie

Hm, Unexpected token ?
u/Purpzie

Managed to shorten it to with(x)for(r=Math.random,i=32;i--;beginPath(arc(r()*500+750,r()*500+300,i*9+i*9*S(t)*C(t),0,9),fill()))fillStyle=hsla(${t*99+i*9},99%,50%,.01)

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geb

remix of d/10293 by u/f8f82804

function u(t) {

with(x)for(i=c.width=396;i--;fillText('lol',99*(i?2+T(i%47+t):1),72*(i?2+T(t-i):3)))i||(font='5cm a',globalCompositeOperation='source-atop')

Oct 9 2018 6:05 PM UTC

}// 140/140

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Purpzie

remix of d/10292 by u/Purpzie

function u(t) {

for(i=1e3;i--;x.fillRect(960+S(i**9)*500*S(t),540+C(i)*500*C(t),9,9))x.fillStyle=`hsl(${t*50} 99%75%)`

Oct 9 2018 5:47 PM UTC

}// 102/140

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u/katkip

looks nice