Dweets awesomed by u/stefano

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.

Try the new frontend: beta.dwitter.net
Current theme challenge: #Opposites

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lerc

remix of d/23842 by u/sandromiccoli

function u(t) {

r=Math.random
for(i=899;i--;)R=r()*300,A=r()-t*3+R/94,x.fillRect(960+R*S(A),540+R*C(A),3,3),x.clearRect(960+R*S(A-=3),540+R*C(A),4,4)

Nov 4 2021 8:31 AM UTC

}// 133/140

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u/magna

Very cool!
u/Xen

nice!

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magna

remix of d/24280 by u/magna

function u(t) {

c.width=f=255,k=40*(t+8)
for(i=f;i--;)for(j=f;j--;x.fillRect(i,j,1,(X*X+Y*Y)**S(t)**2-.2+S(k*X)*S(k*Y)*S(k/20/f)+(i&j)&1))X=i/f-.5,Y=j/f-.3

Nov 2 2021 6:46 PM UTC

}// 139/140

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Magic!

Show more comments…
u/magna

Keeps evolving #waitforit
u/cantelope

dafuq
u/magna

It all started with d/24264 courtesy of u/Jabo
u/taupelink

wow
u/Joachim

#sierpinski
u/Xen

love it!
u/donbright

beautiful
u/andrea270872

terrific stuff... I will have to study every character of your code!!
u/Jabo

Hero
u/joeytwiddle

magic ❤️

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magna

remix of d/24275 by u/magna

function u(t) {

c.width=f=99
c.style.filter='sepia('
for(a=f*f;a--;x.fillRect(i=a%f,j=a/f|0,.7,Math.hypot(X=i/f-.5,Y=j/f-.3)-.2+S(k*X)*S(k*Y)*S(t)))k=f*t

Nov 2 2021 4:30 AM UTC

}// 137/140

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TGY

remix of d/24233 by u/TGY

function u(t) {

for(c.width=i=2e3;i--;x.fillRect(S(i/20^5)*99*m+500+S(t*3)*200,800+S(t*6)*59+m,m*3,-m*9))m=200/(99-(t+i/20)%99)

Oct 25 2021 2:10 PM UTC

}// 111/140

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#d3 city walk

u/ciaccodavide

wow

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magna

function u(t) {

t||(w=c.width=192)
for(h=54,i=w;i--;x.fillRect(i,R,1,j/w))for(R=t*39|0,X=i/h-2.4,Y=R/h-1,a=b=0,j=w;a*a+b*b<5&&j--;)[a,b]=[a*a-b*b+X,2*a*b+Y]

Oct 22 2021 3:06 AM UTC

}// 140/140

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#mandelbrot #glitch

u/magna

My first attempt to draw a Mandelbrot fractal, straight from the reference implementation from Wikipedia. Still need to learn lots of size/speed hacks, apparently :)
u/KilledByAPixel

congrats!
u/Toby

nice!

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magna

function u(t) {

if(t>5)return
T=t**.5
r=T*16
p=T*6.283
for(j=17;j--;)for(i=30;i--;x.fill())x.beginPath(),x.arc(i*64+C(p)*r,j*64+S(p)*r,4,0,7)

Oct 19 2021 4:04 AM UTC

}// 125/140

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u/Joachim

#pattern

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ketolli

function u(t) {

a=1920;x.fillRect(0,0,a,a);for(i=0;i<3300;i++)x.fillStyle=R(-80+i/12),x.fillRect(a/2+C(t/5-i/7)*i/3,a/4+C(t/2-i)*i/4,99-i/40,99-i/40)

Oct 16 2021 3:14 PM UTC

}// 133/140

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Cosmic Horror #ScaryMovies

u/Gamer_Boy66

sick
u/sigveseb

wicked
u/davidsover

rad
u/SockTaters

gnarly

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pavel

function u(t) {

c.width|=f=(X,Y,r)=>r>1&&x.moveTo(X+r,Y)+x.arc(X,Y,r,0,7)+f(X+r*C(a=(S(b=5*t)-b)/4),Y,r/2)+f(X,Y+r*S(a),r/2)
f(960,540,270)
x.fill`evenodd`

Oct 13 2021 9:44 PM UTC

}// 139/140

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Some nice math for the 270 initial radius: The half-height is 540, this must equal r+r/2+r/4+r/8+...=r(1+1/2+1/4+1/8+...). Think about the bit in the brackets in terms of pizzas. You have a whole pizza, plus half a pizza, plus a quarter (half the remaining half), plus an eighth (half the remaining), etc. You have two pizzas! So 540=r*2.

u/pavel

Remix of d/11587. I remixed my other remix but that one was boring so I deleted it.
u/ciaccodavide

nice!
u/cantelope

i think about everything in terms of pizzas

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tomxor

remix of d/24055 by u/Joachim

function u(t) {

with(x)for(i=0;i<9;stroke())lineTo(a=8*i,b=50+5*C(t-i)),lineTo(a-5*S(t-i),b+9),lineTo(a,b),fillRect(i&&(a-t)%21*6,64,i||(c.width=128),1-i++)

Oct 10 2021 12:47 PM UTC

}// 140/140

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Mini Stick Millipede

u/danny@hille.dk

Great golf
u/Joachim

clever!

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ciaccodavide

function u(t) {

for(w=1920,h=1080,i=3e4;i--;)r=Math.random,X=r(),Y=r(),
x.fillRect(w*X,h*Y,Math.hypot(S(.5-X)*1.5, S(.5-Y)*2),t<7)

Oct 8 2021 11:58 AM UTC

}// 114/140

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Elliptical galaxy (filling the void)

dwitter.net | stefano (11979)