Top dweets by u/rodrigo.siqueira

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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Current theme challenge: #Food

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rodrigo.siqueira

remix of d/17299 by u/tomxor

function u(t) {

for(A=a=b=0,i=1e4;i--;x.fillRect(a*800-640,b*900,.3,1))
r=0|(1-~t/2)*Math.random(),
a+=(r-a/3+b*S(a*2))/1.8,
b+=.4-b/3+C(A*2)/3-.03,
A=a

Jan 20 2020 8:55 PM UTC

}// 136/140

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This starts with a dual structure for 2 possible values of "r" (random 0 or 1) and then a triple structure appears when r is changed to 3 possible values ( 0 or 1 or 2) #tree

u/rep_movsd

Actually a remix of https://www.dwitter.net/d/15329

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rodrigo.siqueira

remix of d/14525 by u/rodrigo.siqueira

function u(t) {

for(var I=960;I--;)for(var U=P=X=I/190-3,Q=Y=t/3-1.85,k=14;k--;)U=X,X=X*X-Y*Y+P,Y=2*U*Y+Q,X*X>2?x.fillRect(I*2,t*99,2,2):x.fillStyle=R(k**2)

Jun 14 2019 2:56 PM UTC

}// 140/140

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Red rays from the Mandelbrot Set #mandelbrot #fractal

Show more comments…
u/KilledByAPixel

Amazing.
u/artfarnaa

Is there a way to make these fractal examples render faster? Perhaps offload the calculations to web assembly?
u/username

"Red rays" also known as low iteration count
u/13thptr

u/artfarnaa wasm isn't much faster than js on most platforms and it takes a lot of space to set up
u/13thptr

see u/rbong's work on it
u/katkip

i don't understand this so awesome
u/rodrigo.siqueira

Artfarnaa, it is possible to make super fast, see this pure JS fast implementation: https://csl.name/mandelbrot/ There are many tricks specifically created to calculate Mandelbrot Set (e.g. avoid calculations in a rectangle inside the main set because all pixels are white and calculations in this white area is slower than other parts), but no speed optimization were used here because of space constraints. Some tricks to make it faster: do not use time variable to do calculations (because it is max 60 fps), do not plot each pixel, but store them in an array and plot at once using c.putImageData(img)...
u/KilledByAPixel

There is one way to make it very very fast. I just made a quick shader of it for you! https://www.shadertoy.com/view/wtjGz3
u/artfarnaa

Thanks guys, great inspiration.

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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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rodrigo.siqueira

remix of d/12129 by u/rodrigo.siqueira

function u(t) {

c.width^=Y=0
for(X=2e3;X--;)
 Y=C(Y+t)*X/450,
 x.fillRect(X,540+Y*120,5,5)

Feb 4 2019 2:12 PM UTC

}// 74/140

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A very small bifurcation equation. #attractor

u/rodrigo.siqueira

Animated #bifurcation

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rodrigo.siqueira

remix of d/10786 by u/pavel

function u(t) {

for(c.width|=i=128;i--;)
for(j=64;j--;)
s=150*T((i&j)-t/3),
x.fillRect(300+10*i-t/2,9*j-s/2,9,9)

Nov 4 2018 6:49 PM UTC

}// 96/140

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Sierpinski rain

u/anotherkitten

some stay dry and others feel the pain
u/erin

sierpinski rin
u/erin

...rain

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rodrigo.siqueira

function u(t) {

for(i=50;i--;)
x.fillRect(t*260, i*50+50*S(S(i/9)*5+6*S(t+i/9)),5,5)

Oct 24 2018 9:17 PM UTC

}// 69/140

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Wireframe surface

u/lionleaf

#landscape #wireframe I like it! And just 69 characters too
u/aleamb

great!

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rodrigo.siqueira

function u(t) {

t?c.style.filter=`invert(`:𝕏=X=Y=0
for(i=8e4;i--;𝕏=X,x.fillRect(3500+Y*5e3,1350+X*4e3,t<1,.1))
X=S(X*X-Y*Y+0.03),
Y=C(2*𝕏*Y+1.929)

Nov 3 2025 6:34 PM UTC

}// 130/140

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The mysterious Simone Attractor (a=0.03, b=1.929) #attractor

u/ximavus

eeeerieeee
u/magna

I audibly said, "wow..."

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rodrigo.siqueira

remix of d/34288 by u/DazeWare

function u(t) {

for(i=2e3;i--;x.fillRect(i,t*120,.6,z*2))for(z=0,j=9;--j;x.fillStyle=`hsl(${Y*Y},80%,${Y*9}%)`)z-=S(Y=S(t/j/3)*j-S(z)*5+j)**2+S(i/40/j)

Sep 15 2025 7:38 PM UTC

}// 135/140

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Golden Suminagashi

u/cantelope

golden wat
u/ximavus

s u m i n a g a s h i

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rodrigo.siqueira

remix of d/33571 by u/rodrigo.siqueira

function u(t) {

c.style.filter=`invert(1`
for(i=9100;i--;){
r=S(i/t)
X=r*C(k=i/3.5+r*2)*960
Y=r*S(k)*930
Z=r*C(S(i))%1+3
x.fillRect(960+X/Z,540-Y/Z,.1,t<5)}

Apr 9 2025 2:36 PM UTC

}// 140/140

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Double star shell

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rodrigo.siqueira

remix of d/33424 by u/rodrigo.siqueira

function u(t) {

for(c.width%=i=2e4;X=S(i+t),Y=C(i+t),Z=1/S(i*i),V=C(t+X/3)*X+S(t)*Z,W=S(t)*X+C(t)*Z-6,i--;)x.fillRect(960+2e3*V/W,540+2e3*Y/W,5,5)

Mar 2 2025 10:03 PM UTC

}// 130/140

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Conic interaction

u/cantelope

mind bending

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