https://twitter.com/ntsutae/status/1512… by pavel

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

function u(t) {

f=(x,y,n=0)=>x<2?f(x*x-y*y,2*T(2*x*y)-.5,n+1):C(n/4)/2-.5
for(i=5e4;i--;x.fillRect(X=u&2047,u>>11,f(X/960-1,u/2e6-.56),1))u=-~u

Apr 7 2022 11:41 PM UTC

}// 127/140

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https://twitter.com/ntsutae/status/151218131…

Show more comments…
u/pavel

Cool function from u/ntsutae, but mostly tinkering with the rendering logic so its quick and short. Takes about a second.
u/pavel

Renders f on -1<=x<=1 and -9/16<=y<=9/16
u/pavel

Expects 0<=f(x,y)<=1 in that range
u/pavel

...or alternatively -1<=f(x,y)<=0 in that range too as my code is doing...
u/pavel

i can be initialized to whatever you want, it is a pure speed vs lag tradeoff
u/taupelink

wow!
u/ntsutae

👍👍
u/danny@hille.dk

NICE! - Interestingly this code f=(X,Y,n=98)=>Y*Y>n?n:f(4*X*Y-.5,Y*Y-X*X,n+1.2) from d/19821 produces an image with many similarities with this.
u/danny@hille.dk

DANG this is speedy! - you can crank out some fractals in no time :-) f=(X,Y,n=1)=>X*X>n?n:f(4*X*Y-.5,Y*Y-X*X,n+1.2) for(i=5e4;t<1&&i--;x.fillRect(X=u&2047,u>>11,19/f(X/960-1,u/2e6-.56),1))u=-~u


      u(t) is called 60 times per second.
      t: elapsed time in seconds.
      c: A 1920x1080 canvas.
      x: A 2D context for that canvas.
      S: Math.sin
      C: Math.cos
      T: Math.tan
      R: Generates rgba-strings, ex.: R(255, 255, 255, 0.5)

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