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.
I golfed it down to 134: for(c.width=X=Y=i=850;i--;x.fillRect(425+X*99,240+Y*99,5,5))j=i>>6,X=C(a=Y+j)+C(b=X+t+j*9),Y=S(a)+S(b),x.fillStyle='hsl(${i},99%,50%)'
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)