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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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23_Skidoo

remix of d/12254 by u/23_Skidoo

function u(t) {

for(s=24,d=480,i=4017;i--;f=(X+Y)/d+t,x.fillStyle=`hsla(${S(f)*d} 66%${C(f*9)*C(f*8+t)*81+Y/d*8}%`)x.fillRect(X=i%82*s,Y=~~(i/82-t*9)*s,s,s)

Feb 11 2019 3:56 AM UTC

}// 140/140

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robbyg

function u(t) {

f=(X,Y,w)=>{var W=w/2,h=X-W,v=Y-W
x.rect(h,v,w,w)
if(W>9)f(h,v,W),f(h+w,v,W),f(h,v+w,W),f(h+w,v+w,W)}
t||f(960,540,540)
x.fill('evenodd')

Feb 11 2019 1:07 AM UTC

}// 137/140

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#recursive squares

u/robbyg

Thanks u/katkip for the recursive examples
u/katkip

Beautiful
u/robbyg

133: f=(X,Y,w,W,h,v)=>(W=w/2)>4&&(x.rect(h=X-W,v=Y-W,w,w),f(h,v,W),f(h+w,v,W),f(h,v+w,W),f(h+w,v+w,W)) t||f(960,z=540,z) x.fill('evenodd')

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username

remix of d/888 by u/jczimm

function u(t) {

for(c.width|=i=999;i--;0)for(j=(t%7|0)+1;j--;0)x.fillRect(960+196*C(i)*S(T(t/2)+j/i),542+196*S(i),9,9)

Feb 11 2019 12:30 AM UTC

}// 102/140

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#golfed and number of dot changes

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rodrigo.siqueira

function u(t) {

c.width|=X=Y=Z=6;for(i=3e3;i--;)
X+=.1*(Y-X),
Y+=.01*(X*(29-Z)-Y),
Z+=.01*(X*Y-1.6*Z),
x.fillRect(960+X*30+Y*C(t*2)*10,1130-Z*22,6,9)

Feb 11 2019 12:26 AM UTC

}// 133/140

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Butterfly effect using Lorenz nonlinear equations with chaotic behavior. #Lorenz #attractor

u/katkip

#cute btw

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username

remix of d/701 by u/sigveseb

function u(t) {

(F=Z=>{for(x.fillStyle=R(W=1/Z*4e3,W/2,W),i=Z*Z;n=i%Z,m=i/Z|0,i--;n%(t%2)^m%(t%2)&&x.fillRect((n-t%2-1)*W,(S(t)+m-1)*W,W,W));Z&&F(Z-6)})(36)

Feb 11 2019 12:21 AM UTC

}// 140/140

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username

remix of d/7702 by u/jylikangas

function u(t) {

for(c.width=i=714;i--;F(t+i/891+(i>>7)/2,-3))(F=(a,o)=>x.strokeRect(321+S(a)*290-o/(Z=C(a)+1+(t%6<3)),9+C(a*(t/6%4|0))*285/Z,o/=Z/2,o))(i,4)

Feb 11 2019 12:17 AM UTC

}// 140/140

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xem

function u(t) {

c.width^=0;x.font="300px arial";s=(t*500)%1080;z=(a,b,c)=>x.fillText(a,(~~(s/b))*b,c);z("15fps",32,300);z("30fps",16,675);z("60fps",8,1050)

Feb 10 2019 7:46 PM UTC

}// 139/140

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How fast are your eyes?

u/magna

Nice!
u/Galaxtone

(People who think you can only view 30fps): No you just cheated and made 60fps -> 30, 30 -> 15 and 15 ->
u/Galaxtone

7.5*
u/Galaxtone

and I'm like (Me): Why would anyone lie on the internet

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katkip

remix of d/12275 by u/katkip

function u(t) {

s=50;x.fillRect(960,0,10,2e3),x.fillRect(0,540,2e3,10),x.drawImage(c,960,540,s*16*(C(t*s)<.5?-1:1),s*9*(S(t*s)<.5?-1:1))

Feb 10 2019 5:53 PM UTC

}// 120/140

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vnf

remix of d/12275 by u/katkip

function u(t) {

a=C(t)<.5;s=S(t)<.5;b=480+(a?1:-1)*50+(s?1:-1)*100;y=270+(!s?1:-1)*50+(a?1:-1)*100;x.fillRect(860,440,200,200);x.drawImage(c,b,y,960,540)

Feb 10 2019 4:30 PM UTC

}// 137/140

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f-fractal, slow but gets there eventually #fractal

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vnf

remix of d/12270 by u/katkip

function u(t) {

x.font='50px monospace',r=Math.random;for(j=100;j--;)i=r()*192|0,j=r()*32|0,x.fillText('EVEX'[r()*4|0],30*i,35*j)

Feb 10 2019 3:43 PM UTC

}// 113/140

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for r/EVEX

u/katkip

um ok