const scaleSize = 4;

​

const sinSize = size / 2

​

function setup() {

  createCanvas(size*scaleSize, size*scaleSize);

  frameRate(15);

  strokeCap(SQUARE);

​

}

​

let x = 1

​

function draw() {

  background(0);

​

  scale(scaleSize)

​

  let a = frameCount / 10;

  let inc = TWO_PI / 25.0;

  for( let i = 0; i < size; i = i+3 ){

    stroke('red')

    line(i, sinSize, i, sinSize + sin(a) * size*0.4);

    stroke('blue')

    line(i+1, sinSize, i+1, sinSize + sin(a * x + 1) * size*0.4);

    stroke('#0f0')

    line(i+2, sinSize, i+2, sinSize + sin(a * 1.2 + 2) * size*0.4);

    a = a + inc;

  }

  x += 0.01

}