Snowman

/* Constants representing the radius of the top, middle,
 * and bottom snowball. */
var BOTTOM_RADIUS = 100;
var MID_RADIUS = 60;
var TOP_RADIUS = 30;
function start(){
    var bottomY = getHeight() - BOTTOM_RADIUS;
    var midY = bottomY - BOTTOM_RADIUS - MID_RADIUS;
    var topY = midY - MID_RADIUS - TOP_RADIUS;
    var bottomCircle = new Circle(BOTTOM_RADIUS);
    bottomCircle.setPosition(getWidth()/2, bottomY);
    bottomCircle.setColor(Color.gray);
    add(bottomCircle);
    var middleCircle = new Circle(MID_RADIUS);
    middleCircle.setPosition(getWidth()/2, midY);
    middleCircle.setColor(Color.gray);
    add(middleCircle);
    var topCircle = new Circle(TOP_RADIUS);
    topCircle.setPosition(getWidth()/2, topY);
    topCircle.setColor(Color.gray);
    add(topCircle);
}