var START_RADIUS = 1;
var INCREMENT = 1;
var CHANGE_COLORS_AT = 10;
var circle = new Circle(START_RADIUS);
circle.setRadius(START_RADIUS);

function start(){
    setTimer(draw, 50);
}

function drawCircle(radius, color){
    var circle = new Circle(radius);
    circle.setColor(Randomizer.nextColor());
    circle.setPosition(getWidth()/2, getHeight()/2);
    add(circle);
}

function draw(){


    drawCircle(START_RADIUS, Color);

    START_RADIUS++;

    if(START_RADIUS == getHeight()/2){
        stopTimer(draw);
    }
}