x: 200,

    y: 200

};  

​

var color = {

    r: 0,

    g: 0,

    b: 0

};

​

function setup() {

  createCanvas(400, 400);

    background(0);

}

​

function draw() {

    //set a random x,y position

    position.x = random(10,390);

    position.y = random(10, 390);

​

    //map position of spot to a color value. The greater the 

    //x-position, the whiter the spot

    color.r = map(position.x, 10, 390, 0, 255)

    color.g = color.r

    color. b = color.r

    noStroke();

    fill(color.r, color.g, color.b)

    ellipse(position.x, position.y, 25);

}