d/31930 by 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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taupelink

remix of d/31916 by u/taupelink

function u(t) {

f=u=>((u%4-2)**2-2-i%2)**2;g=n=>f(X*n/8)+f(Y-Y*n/8)&13;for(i=2e4;i--;x.fillRect(192+8*X,28+8*Y,t<7,g(1)+g(7)==g(2)+g(6)))X=i*t%192,Y=X*i%128

May 29 2024 4:25 PM UTC

}// 140/140

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d/31930

u/aaaaaz

anylink to understand how does it works ? it looks like Lissajous but superposed
u/taupelink

No links handy, sorry! I can say that this code adapts the concept of signed distance functions. f is a SDF in one dimension, g in two dimensions. g uses binary arithmetic to kind of pick out certain parts of the output of f, and the parameter of g makes it work at different scales.
u/taupelink

Also: If you see a term like "i%2" or "i%3" or "(i&5)" in any of my recent dweets...that tends to superimpose two related-but-different patterns on each other. Which can be hard to make work. I am still experimenting!
u/taupelink

*two or more, depending on the expression


      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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