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.
Had to shrink it to golf... Full dweet: for(c.width=i=600;i--;) z=Math.max(Math.min(-t+i/4,0),-1), x.setTransform(a=C(z),b=-S(z),-b,a,400+40*i+-150*t,i/2), x.fillRect(54,100,-25,-80)
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)