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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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pavel

remix of d/11420 by u/cantelope

function u(t) {

j=t?j%6e3:P=[]
for(w=i=150;i--;c.width=-1)P[j++]=[40,8+S(i/4)*C(t*16)*3]
P.map((p,i)=>x.fillRect(w+(i%w-75)*(g=w/p[0]--),p[1]*g,s=g*g/23,s))

Dec 15 2018 7:17 AM UTC

}// 140/140

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u/katkip

#d3 #landscape Nice!!
u/pavel

#uncompressed

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pavel

remix of d/11391 by u/pavel

function u(t) {

for(a=t?b:{8256:1},i=frame%9==1&t<9.5&&(c.width|=b={},2e5);i--;x.fillRect(i&1017,i>>7,8,a[q]*8))k=i%8+5,b[q=i>>3]^=a[q+k%3*128+k/3%3-129|0]

Dec 15 2018 2:32 AM UTC

}// 139/140

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Fredkin Replicator (non-minified version)

Show more comments…
u/pavel

Using div/mod to store 128x128 pixel coordinates in a. 8256=128*64+64 is the middle pixel.
u/pavel

Using frame%9==1 to update the automata once every nine frames. Frames are 1 indexed.
u/pavel

i encodes three variables: lowest 3 bits is neighbor cell 'index', middle 7 is x, and upper 7 is y.
u/pavel

To get neighbor cells I do the div/mod trick on the 'index' but need to exclude (0,0) which has index 4. So I map cell index to i%8+5 which %9 is [5,6,7,8,0,1,2,3]
u/pavel

A cell is 'on' iff the parity of its 'on' neighbors is odd which is the same as the xor of neighbor states
u/pavel

I cheat a little. Y=i>>10 so my rect should use (i>>10)*8 but to save chars I use i>>7. The cells are slightly off-place vertically but its hard to notice.
u/pavel

i&1017 is a mistake, oops, should be i&1016, causes tiny visual glitch. 1016=0b1111111000 which is X*8
u/pavel

#uncompressed

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pavel

remix of d/11279 by u/marc8

function u(t) {

with(x)for(c.width|=j=9;j--;fillStyle=j%2?'red':'blue',fill('evenodd'))for(beginPath(i=6);i--;arc(960,540,2.6**p,a=(6*i+p)*71/113,a))p=j+t%2

Dec 4 2018 5:18 AM UTC

}// 140/140

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355/113 is a famous approximation of pi and here we need pi/5 which is perfect as 5 divides 355 giving 71/113

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u/marc8

Great remix
u/sigveseb

.628 works too, and is a little shorter :)
u/pavel

Yeah I didn't need the precision but it was an interesting coincidence and I had extra chars :)
u/donbright

wondrful
u/pavel

#uncompressed
u/katkip

#pemtagram
u/katkip

#tagfail #pentagram

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pavel

remix of d/9830 by u/joeytwiddle

function u(t) {

for(c.width|=j=22,t%=2;--j;)for(i=8;i--;x.arc(960,540,i&&j>2*p&&70*(j-2*p),a=(i+p)*355/339,a))p=1/(1+2**(j+6-16*t));x.fill('evenodd')

Nov 23 2018 3:16 AM UTC

}// 133/140

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u/joeytwiddle

Golfed with plenty to spare. Fantastic!
u/sigveseb

Oh my
u/iverjo

Yes!
u/pavel

#uncompressed

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pavel

remix of d/9174 by u/f8f82804

function u(t) {

with(x)for(N=i=300;A=S(a=i--/99);beginPath(fillStyle=`hsl(${i*N} 90% ${c**4}%`))c=A*S(b=t+i)+2,fill(arc(N*c,N*(A*C(b)/2-C(a)+2),70*A+9,0,7))

Nov 8 2018 11:00 PM UTC

}// 140/140

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u/katkip

I like the fact that it is so fast
u/iverjo

Nice! This reminds me of the spinning beachball of death (on Mac OS X)
u/aleamb

#colors #d3 #sphere
u/pavel

#uncompressed

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pavel

remix of d/10653 by u/anotherkitten

function u(t) {

with(x)for(c.width=-1,translate(150,i=84);--i;rotate(t),t=2.1,fill(new Path2D('M67 28 9-72-9-72 37 11-19 11-28 25')))fillStyle=R(a=50*i,a,a)

Oct 24 2018 8:24 PM UTC

}// 140/140

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u/yonatan

hah! - works as a separator
u/anotherkitten

dang, well done. wasn't sure if it was doable.
u/lionleaf

Nicely done!
u/aleamb

cool!
u/magna

damn.
u/joeytwiddle

Very good
u/katkip

Awesome!
u/katkip

#path2d
u/pavel

#uncompressed in black and white

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