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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) {

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~~

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ersagun

function u(t) {

d=(a,...r)=>(x.fillStyle=a,x.fillRect(...r))
d(R(0,0,0,.1),0,0,w=2e3,w)
d('white',i=Math.random()*w,i*w%w,5,5)
x.drawImage(c,-40,-22,w,1125)

Oct 21 2018 10:36 AM UTC

}// 140/140

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pavel

function u(t) {

if(!t)a=0,i=1050,j=800,x.font="99px a"
with(x)save(),restore(fillText("🚀",!translate(i+=9*S(a+=(t%3-1)/9),j+=9*C(a)),!rotate(2.4-a)))

Oct 21 2018 7:53 AM UTC

}// 133/140

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u/katkip

cute!

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heyitsguay

remix of d/10580 by u/ersagun

function u(t) {

if(!t)s=k=i=j=500
with(Math)s+=k+=(random()-.4)/40,k=min(max(k,-C(t)),C(t))
d=1+(i+j-1e3)**2/3e6
i+=C(s)*5/d
j+=S(s)*5/d
x.fillRect(j,i,5,5)

Oct 21 2018 6:23 AM UTC

}// 140/140

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grapevine

u/katkip

cool
u/ersagun

Nice. I see wasted so many characters.

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anotherkitten

function u(t) {

for(d=19;d--;x.beginPath(x.fill())){p=d+t%1;x.fillStyle=`hsl(${140+t*2} 66%${80-S(p/4)*40}%`;x.arc(960,540,p*60,o=p/2+t/2,++o)}

Oct 21 2018 3:06 AM UTC

}// 127/140

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cute spiral

u/Agnes

Consider using properly formatted HSL if you have the characters to spare - these all show up as 100% black on iOS Safari!
u/anotherkitten

true, should have done, just habit to use the broken one

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ersagun

function u(t) {

if(!t)s=k=0,i=j=b=500
s+=(k+=Math.random()-.5)/20
k=Math.min(Math.max(k,-5),5)
i+=C(s)/50
j+=S(s)/50
x.fillRect(S(j)*b+b+b,S(i)*b+b,5,5)

Oct 21 2018 1:55 AM UTC

}// 136/140

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ersagun

remix of d/10573 by u/logistikalism@gmail.com

function u(t) {

for(i=9;--i;)for(j=9;--j;)x.fillRect(120*i+C(t*i)*50,120*j+C(t*j)*50,1,1)
x.fillRect(C(t)*300+1480,C(t*(1+Math.sqrt(2))/2)*300+540,1,1)

Oct 21 2018 1:10 AM UTC

}// 135/140

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Plaid pillow #goldenratio #phi

u/katkip

nice