Random dweets | Dwitter

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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prplz

remix of d/10071 by u/prplz

function u(t) {

for(let q=33,X,Y=q,r;Y--;)for(X=59;X--;x.fillRect(X*q,Y*q,q,q))x.fillStyle=R(0,r=S((X&t^Y&t)+t*2)*80+80,r*2)

Sep 25 2018 1:14 AM UTC

}// 108/140

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ellisk1

function u(t) {

with(x)beginPath(q=(t+2)|0),fillStyle=R(a=33+q*3+q%2*89,a*.7-40),arc(960,540,z=q*20+S(j=t*9)*(10+q/3)+S(t)*9,j,j+50/z**.67),fill()

Sep 28 2018 2:26 AM UTC

}// 130/140

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Tree growth rings

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magna

remix of d/8542 by u/firegodjr

function u(t) {

x.beginPath(c.width|=0)
for(i=500;--i;)x.arc(S(k=i*(t>>1)/32+t)*C(i)*400+900,C(k)*400+500,19,0,7)
x.fill()

Jun 12 2018 6:24 PM UTC

}// 106/140

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Golfed down a bit to make room for more fanciness

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LimeLaser

function u(t) {

for(i=2304;i--;){y=i*t%256
b=i%192-95
r=i%256-127
x.fillStyle=R(y+1.475*r,y-.165*b-.572*r,y+1.881*b)
x.fillRect(i%64*30,(i/64|0)*30,30,30)}

Aug 7 2021 7:14 AM UTC

}// 139/140

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Approximate YCbCr BT.2020 Color Conversion Test

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taupelink

remix of d/26050 by u/taupelink

function u(t) {

eval(unescape(escape`景爨椽挮睩摴桼㴰㭩ⴭ㭸⹦楬氨⤩砮扥杩湐慴栨砮晩汬却祬攽刨椯㐫㌲ⱪ㵩⨪⠮㌫䌨椫琯㈩⼵⥞椯㘬椥㤷ⱱ㵓⡪⭴⼶⤪⨲⬮〱⤩ⱸ⹡牣⡘㵩⩪┲攳ⱙ㵪⩪⼴〬椪樯焪太⨮㔯㉥㔬椬椫㌭㌪䌨樫堯㘰〩⨪㈩`.replace(/u([^D].)/g,'$1%')))

Aug 28 2022 4:05 AM UTC

}// 139/140

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d/26051

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rileyjshaw

remix of d/2608 by u/rileyjshaw

function u(t) {

c.width|=0
for(i=-9;i++<99;x.globalCompositeOperation='xor')x.fillRect(i*30,0,S(t/3)*99,2e3)
while(i--)x.fillRect(0,i*15-99,2e3,C(t/5)*40)

Apr 26 2017 8:59 PM UTC

}// 138/140

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Looks nice with themes, eg:

u/rileyjshaw

c.style.background='#000';x.fillStyle='#080'

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yonatan

remix of d/10685 by u/yonatan

function u(t) {

(t?j:c)[t?'outerHTML':'innerHTML']=h=`<svg id=j><filter id=f><feTurbulence baseFrequency=${t%1}>`
c.style.filter='url(#f)'

Oct 25 2018 5:53 PM UTC

}// 122/140

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Another SVG filter test

u/yonatan

97 chars: c.innerHTML=<svg><filter id=f><feTurbulence baseFrequency=${t%1} id=p>;c.style="filter:url(#f)"
u/yonatan

actually less, i don't know why there's an id=p in there
u/katkip

#maze

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Froff

function u(t) {

with(x){r=Math.random;a=r();b=r();beginPath();moveTo(0,0);lineTo(a*2e3,b*1e3);strokeStyle=R(200+55*b,200+50*(a-b),0,.2/(a*a+b*b));stroke()}

Oct 22 2017 3:12 PM UTC

}// 139/140

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tomxor

remix of d/19162 by u/katkip

function u(t) {

f=(x,y,n)=>n?f(S(x*2+1)-C(y*2),C(x*2-1)-C(y*2),n-1):S(x+y)
for(n=8,i=n*1920;i--;)
x.fillRect(X=i%1920,Y=i/1920+n*t*60,1,f(Y/640,X/640,5))

Jun 17 2020 3:47 PM UTC

}// 137/140

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u/13thptr

nice and polished

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M1T0

function u(t) {

c.width|=0
for(i=99;i--;)
x.fillRect(i%S(t)%i*1920,i%C(t)%i*1080,100,100)

Jan 8 2018 11:42 AM UTC

}// 74/140

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u/donbright

this is weird and bizarre in the good way