Dweets awesomed by u/taupelink

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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batboy

function u(t) {

t==0?p=Array(1920).fill(1):0
for(i in p)Math.random(x.fillRect(i,0,1,p[i]))<.5?p[i]+=10:0
if(p.every(o=>o>1110))p.fill(1),x.fillStyle="#7cf"

Mar 19 2019 2:35 AM UTC

}// 140/140

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andrea270872

remix of d/12771 by u/andrea270872

function u(t) {

c.width|=K=1e3
A=[(t*97%11-5)*K,(t*89%13-6)*K,0]
P=t?P.map(([i,j,z,v])=>[i,j,(z+1)%99,x.fillRect(K+i/z,500+j/z,z,z)]):[A]
P[K]||P.push(A)

Mar 15 2019 7:44 PM UTC

}// 137/140

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Build-up!

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u/Xen

love it
u/pavel

103 for(c.width|=K=k=1e3;k--;z>0&&x.fillRect(K+(k*97/60%11-5)*K/z,500+(k*89/60%13-6)*K/z,z,z))z=(60*t-k)%99
u/pavel

Looks like the code you started with used Math.random at each step which made the ultimate position of each square at time 't' impossible to determine directly. Switching to instead use any function of just t makes it quite simple so there is no need to initialize stuff at time 0 and keep it updated.
u/pavel

I learned that in d/11421 to save chars and make d/11424
u/andrea270872

great. thanks very much
u/andrea270872

In my head I was thinking also that t*97%11 is a pseudo-random generator...
u/katkip

Satisfying

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marc8

function u(t) {

c.width=480
z=99
for(j=-2*z;j<2*z;j++)
{k=j<-z?j+z:j>z?z-j:0
for(i=0;i<9;i++)x.fillRect(z+i*25+S(t)*75+2*k*C(t+k/z),z+j/4,12+10*k/z,1+k/z)}

Mar 15 2019 4:00 PM UTC

}// 140/140

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#default

u/Xen

nice
u/tomxor

Eery, feels like some kind of swimming creature!

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yokljo

remix of d/12755 by u/Jezza

function u(t) {

x.fillRect(0,0,1920,1080)
X=C(t)*4+16
Y=S(t)*2+9
for(i=9;i--;)Z=S(Y),Y+=S(X),X+=Z,x.clearRect(X*60,Y*60,3*i,3*i)

Mar 15 2019 9:24 AM UTC

}// 112/140

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I haven't actually put the time into understanding how this works, but that doesn't stop me from remixing it!

u/lionleaf

#attractor :)

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Jezza

remix of d/12739 by u/LimeLaser

function u(t) {

c.width|=r=Math.random,Z=2e3;p=t?p.map(([i,j,u,v]=[Z*r(),Z*r(),4*r()-2,4*r()])=>[(i+u+Z)%Z,(j+v)%Z,u,v,x.fillRect(i,j,8,8)]):[...Array(4e3)]

Mar 14 2019 11:09 PM UTC

}// 140/140

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Squeezed in some snow that floats left. ❄️❄️❄️

u/tomxor

Left!? Blasphemy! :P
u/katkip

This is so smooth
u/LimeLaser

Nicely done!
u/iverjo

#snow

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pavel

remix of d/1112 by u/sigveseb

function u(t) {

for(let w=c.width=127,i=9086,a,b,n,B;a=i&w,b=i--/w;x.fillRect(a,b,1,1/(t+a/n&1^b/n)))n=b-20,B=(w*S(t*9+n/9)+(a-40)**2+n*n)/1e3,n*=B>1||C(B)

Mar 7 2019 8:31 PM UTC

}// 139/140

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#improved performance

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u/pavel

Original runs at 6fps on my machines this runs at 60fps. I lowered the resolution by a quarter (4x perf) and golfed 13 chars to let me declare all vars locally (2x perf).
u/tomxor

wow! this is a massive perf improvement, the original was impressive but I couldn't really see it realtime. Nice one :)
u/katkip

how
u/nender

Wow! This is amazing!
u/sigveseb

Nice!
u/f8f82804

#raytrace #d3 #pbr
u/Cloud

Cool!!!

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katkip

function u(t) {

t||(X=y=1)
f=x=>C(x)*S(x)*x/92+S(x*3.1416)/6
for(i=999;i--;)x.fillRect(960+X*20,540+y*20,10,10),y+=f(X),X+=f(y)

Mar 6 2019 4:35 PM UTC

}// 111/140

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Create your own chaotic #attractor curves #application modify f=x=

u/katkip

Beautiful #math
u/tomxor

I found a moose! :P f=x=>C(x)*T(x)*x/24+S(x/4)+C(x/8)
u/rep_movsd

#underrated

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rrlyrae

function u(t) {

for(c.width|=i=0;i<9;i++){x.fillRect(400+i*100+S(t)*300,400,50,200);n=T(t/2);j=Math.max(Math.min(n**2, 1+1/t), 1-1/t);x.scale(j,j)}

Feb 27 2019 12:04 AM UTC

}// 131/140

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#default with decaying periodic zoom

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katkip

remix of d/12510 by u/katkip

function u(t) {

c.width*=1;x.lineWidth=4;for(j=79;j--;)for(i=5;i--;)x.lineTo(960+C(i*1.57+j/(20+C(t+j/29)*5)+t)*200,900+S(i*1.57+j/99+t)*60-j*9);x.stroke();

Feb 24 2019 12:30 PM UTC

}// 140/140

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Twist

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katkip

remix of d/12347 by u/katkip

function u(t) {

c.width*=1;t||(a=b=5);for(i=999;i--;)a+=S(b+C(a+i/9999)),b+=C(a+C(b+t*i)),x.fillRect(a*590-1800,b*290-300,9,9)

Feb 14 2019 6:13 PM UTC

}// 110/140

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Chaotic #attractor in motion #math (quarc in string theory)

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