​

function setup() {

  createCanvas(400, 400);

  // for(let i =0; i< 2; i++){

  //  randomY.push(random(100,300)); 

  // }

}

​

function draw() {

  background(0);

  randomY.push(random(1,200)); 

  drawLines(0,height/2,200,randomY);

}

​

function drawLines(posX,posY,s,points){

  push();

  //draw background 

  translate(posX,posY);

  //rotate((3*PI)/2);

  noStroke();

  fill(255);

  rect(0,0,s,s);

  //find largest number

  let record = 0;

  for(let p of points){

    if(p > record){

      record = p; 

    }

  }

  stroke(0);

  let px = 0;

  let py = map(points[0],0,record,s,0);

  for(let i =0; i < points.length; i++){

    let x = i * (s / (points.length-1));

    let y = map(points[i],0,record,s,0);

    line(px, py, x, y);

    px = x;

    py = y;

  }

  pop();

}