// make this number bigger for moire patterns

const NUM_LINES = 10;

let x;

let y; 

​

function setup() {

  createCanvas(400, 400);

  x = width/2;

  y = width/2;

}

​

function draw() {

  background(255);

  x = mouseX;

  y = mouseY;

  // x = x + random(-1, 1);

  // y = y + random(-1, 1);

  for (let i = 0; i <= NUM_LINES; i += 1) {

    let startPosX = (width/NUM_LINES)*i;

    let startPosY = 0;

    line(startPosX, startPosY, x, y);

    // uncomment the following lines for fun

    // line(startPosY, startPosX, x, y);

    // line(width, startPosX, x, y);

    // line(startPosX, height, x, y);

  }

}