let startY;

​

function setup() {

  createCanvas(400, 400);

  frameRate(1);

  startX = width/2;

  startY = height/2;

}

​

function draw() {

​

  //background(255);

  if(frameCount % 5 == 0){

    background(255);

  }

  let randomX = random(0, width);

  let randomY = random(0, height);

  // draw starting point

  //fill(255);

  //circle(startX, startY,10);

  // draw second point (random)

  //fill(255,0,0);

  //circle(randomX, randomY, 10);

  // draw line between these two points

  line(startX, startY, randomX, randomY);

  // make the starting be the random point

  startX = randomX;

  startY = randomY;

​

}