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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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ersagun

function u(t) {

t*=60;i=j=0;for(s=8;u=1&(t/2),v=1&(t^u),(s*=2)<513;t/=4){if(!v){if(u==1)i=s-16-i,j=s-16-j;z=i;i=j;j=z}i+=s*u,j+=s*v}x.lineTo(i,j),x.stroke()

Oct 21 2018 10:36 PM UTC

}// 140/140

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Hilbert curve

u/aleamb

love it!
u/aleamb

#hilbert #fractal
u/pavel

Shaved off 16 chars: for(t*=60,i=j=0,s=8;u=t&2?1:0,s*=2,s<513;t/=4,i+=s*u)1&t^u?j+=s:(u&&(i=s-16-i,j=s-16-j),i+=j-(j=i));x.lineTo(i,j);x.stroke()

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yonatan

remix of d/10553 by u/yonatan

function u(t) {

c.width=342
y=w=64
for(i=7;i--;x.drawImage(c,0,y-j,j,j,0,0,w,w))for(j=2**i,k=j*j;k--;y+=!X)x.fillRect(X=k%j|0,y,S(k**4-t),.66**i)

Oct 21 2018 9:50 PM UTC

}// 129/140

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Noise in debug-mode - delete the 342 to fill the viewport

u/yonatan

Maybe chrome does bilinear interpolation and firefox doesn't?
u/Joachim

#noise

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heyitsguay

remix of d/10583 by u/heyitsguay

function u(t) {

if(!t)s=k=i=j=b=509
with(Math)s+=k+=(random()-.4)/40,k=min(max(k,d=C(t/2)),-d)
i+=C(s)/99
j+=S(s)/99
x.fillRect(S(j)*b+b*2,S(i)*b+b,6,6)

Oct 21 2018 5:18 PM UTC

}// 136/140

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rbong

remix of d/10574 by u/rbong

function u(t) {

for(n=200;n-=1/64;x.fillStyle=`hsl(${t*k*30},99%,50%)`,x.fillRect(n%3*666,n*5,16,16))for(r=i=0,k=28;--k/r;i=j)j=2*r*i+1-n/99,r=r*r-i*i-(n%3)

Oct 21 2018 3:46 PM UTC

}// 140/140

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Rainbow Cycling Mandelbrot

u/rbong

#rainbow #fractal #mandelbrot
u/rbong

This version has true color cycling, an animated Julia set, and is centered, but it's 18 characters over:
u/rbong

for(n=200;n-=1/64;x.fillStyle=\`hsl(${t*999+k*22},99%,50%)\`,x.fillRect(n%3*666,n*5,16,16))for(r=C(t*3),i=S(t*4),k=28;--k/r;i=j)j=2*r*i+1-n/99,r=r*r-i*i+1-(n%3)

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ersagun

remix of d/10578 by u/ersagun

function u(t) {

for(i=j=f=24;d=a=>C(t*f)*(a[0].charCodeAt(f)-9e3),f--;i+=d`◴∈⌹⌙⍈⌮⌠⌇⌢⌑⌆⌤⌾⍃⌣⌘⌯⌧〈⌳〉⌤⌬⌯`)j+=d`○⍈⌾⋻⌤⋧⌥⌬⌰⍕⍓⌗⌥⋼⌘⌭⋧〉⌔⌗⍃⌫⌛〈`
x.fillRect(i,j,9,9)

Oct 21 2018 3:43 PM UTC

}// 135/140

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#yeah I managed to remove 5 characters using tagged template literals. I can add 2 more harmonics(=4 characters) now.

u/New_Core

nice.. now you can do x.lineTo(i,j) x.stroke()

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katkip

remix of d/10586 by u/leonarven

function u(t) {

eval(unescape(escape`挮睩摴桼㵲㴳〫匨琯ㅥ㐩⨵㭣⹳瑹汥⹢慣歧牯畮搽✣〵昧㭦潲⡉㴰㭉㱲⩲⨲㭸⹦楬汓瑹汥㴧⌰慤✬砮晩汬⡸⹡牣⡲⩘⨲⸲Ⱳ⩙ⱇ⨹ⰰⰵ⤩⥸⹢敧楮偡瑨⡘㵉⵲⨨夽䤫⬯爦㈵㔩ⱇ㴱⭓⡴⨹⭘⩙⩙⤫㈩㬻`.replace(/u(..)/g,"$1%")))

Oct 21 2018 3:07 PM UTC

}// 135/140

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#waves

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ersagun

function u(t) {

w=c.width=500
for(i=98;i--;)for(j=55;A=i-49,B=j-28,j--;)x.fillStyle=R((A*A+(B-S(t*2)*20)**2)*(B*B+(A-C(t)*40)**2)/w),x.fillRect(5*i,5*j,5,5)

Oct 21 2018 2:26 PM UTC

}// 140/140

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@veubeke helped trim 2 characters.

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veubeke

function u(t) {

x.drawImage(c,C(T=t*99)*($=1+t),S(T)*$)
x.save(x.font='200px"')
x.transform(1,_=-S(t*7)/20,_*-5,1,960,580)
x.restore(x.fillText('👻',-99,0))

Oct 21 2018 1:06 PM UTC

}// 139/140

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1-800-Ghost Dance - WARNING: flickering increases over time

u/veubeke

Soundtrack: https://www.youtube.com/watch?v=IA6o4vq2ldU
u/veubeke

#ghost

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ersagun

remix of d/10585 by u/ersagun

function u(t) {

d=(a,...r)=>(x.fillStyle=a,x.fillRect(...r))
d('#00000001',0,0,w=2e3,w)
d('#fea',i=Math.random()*w,i*w%w,5,5)
x.drawImage(c,-40,-22,w,1125)

Oct 21 2018 1:04 PM UTC

}// 139/140

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leonarven

function u(t) {

c.width|=r=30
for(I=0;I<r*r;x.fill(x.arc(585+r*X,540+r*Y,G*15,0,6)))x.beginPath(X=I-r*(Y=I++/r&255),G=1+S(7*t-Math.sqrt((Y-=12.5)*Y+X*X)/9))

Oct 21 2018 11:05 AM UTC

}// 140/140

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Waves~~