var g;

var b;

​

var inside;

​

function setup() {

  createCanvas(400, 400);

  r = random(255);

  g = random(255);

  b = random(255);

  inside = false;

}

​

function draw() {

  background(220);

  if(mouseY < height/3){

    fill(255, 0, 0);

  }

  else if(mouseY < (2*height)/3){

    fill(0, 255, 0);

    inside = false;

  }

  else if(!inside){

    fill(random(255), random(255), random(255));

    inside = true;

}

​

ellipse(width/2, height/2, 100, 100);

}

​

​

​