Same road but straight. - 63 characters… by katkip

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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katkip

remix of d/9963 by u/BalintCsala

function u(t) {

x.fillRect(960-t*50,t*100,t*100,4);if(t%2<1)x.clearRect(960-t*5,t*100,t*10,4)

Oct 8 2019 5:16 PM UTC

}// 77/140

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Same road but straight. - 63 characters golf

u/katkip

or even 76 bytes: x.fillRect(960-t*50,t*100,t*100,4),t%2<1?x.clearRect(960-t*5,t*100,t*10,4):0
u/yonatan

x.fillRect(960-t*50,q=t*99|0,q,4);x.clearRect(960-t*5,q,t*9,q**.5&1&&4) - there might be a better way without using clearRect


      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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