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 took off 5 characters by moving the Array initialization to the end: c.width|=0;x.font='90px arial';A.forEach(a=>x.fillText(a.t,a.x,a.y+=9));window.onkeypress=e=>A.push({t:e.key,x:t*t*500%1920,y:0})}{A=[]
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)