var RADIUS = 20;
var DELAY = 40;
var width = getWidth();
var height = getHeight();
var NUM_CIRCLES = 10;
var circleDiameter = width/10;
function start(){
 setTimer(buildWall, DELAY);
 stopTimer(buildWall, 12);
    for(var i = 0; i < NUM_CIRCLES; i++){
        var wall = new Circle(20);
        wall.setPosition(i * circleDiameter + RADIUS, 220);
        if(i % 2 == 0){
            wall.setColor(Color.red);
        }else{
            wall.setColor(Color.black);
        }
        add(wall);
    }
    for(var i = 0; i < NUM_CIRCLES; i++){
        var wall = new Circle(20);
        wall.setPosition(i * circleDiameter + RADIUS, 460);
        if(i % 2 == 0){
            wall.setColor(Color.red);
        }else{
            wall.setColor(Color.black);
        }
        add(wall);
    }
    for(var i = 0; i < NUM_CIRCLES; i++){
        var wall = new Circle(20);
        wall.setPosition(i * circleDiameter + RADIUS, 420);
        if(i % 2 == 0){
            wall.setColor(Color.red);
        }else{
            wall.setColor(Color.black);
        }
        add(wall);
    }
    for(var i = 0; i < NUM_CIRCLES; i++){
        var wall = new Circle(20);
        wall.setPosition(i * circleDiameter + RADIUS, 380);
        if(i % 2 == 0){
            wall.setColor(Color.red);
        }else{
            wall.setColor(Color.black);
        }
        add(wall);
    }
    for(var i = 0; i < NUM_CIRCLES; i++){
        var wall = new Circle(20);
        wall.setPosition(i * circleDiameter + RADIUS, 340);
        if(i % 2 == 0){
            wall.setColor(Color.red);
        }else{
            wall.setColor(Color.black);
        }
        add(wall);
    }
    for(var i = 0; i < NUM_CIRCLES; i++){
        var wall = new Circle(20);
        wall.setPosition(i * circleDiameter + RADIUS, 300);
        if(i % 2 == 0){
            wall.setColor(Color.red);
        }else{
            wall.setColor(Color.black);
        }
        add(wall);
    }
    for(var i = 0; i < NUM_CIRCLES; i++){
        var wall = new Circle(20);
        wall.setPosition(i * circleDiameter + RADIUS, 260);
        if(i % 2 == 0){
            wall.setColor(Color.red);
        }else{
            wall.setColor(Color.black);
        }
        add(wall);
    }
    for(var i = 0; i < NUM_CIRCLES; i++){
        var wall = new Circle(20);
        wall.setPosition(i * circleDiameter + RADIUS, 180);
        if(i % 2 == 0){
            wall.setColor(Color.red);
        }else{
            wall.setColor(Color.black);
        }
        add(wall);
    }
    for(var i = 0; i < NUM_CIRCLES; i++){
        var wall = new Circle(20);
        wall.setPosition(i * circleDiameter + RADIUS, 140);
        if(i % 2 == 0){
            wall.setColor(Color.red);
        }else{
            wall.setColor(Color.black);
        }
        add(wall);
    }
    for(var i = 0; i < NUM_CIRCLES; i++){
        var wall = new Circle(20);
        wall.setPosition(i * circleDiameter + RADIUS, 100);
        if(i % 2 == 0){
            wall.setColor(Color.red);
        }else{
            wall.setColor(Color.black);
        }
        add(wall);
    }
    for(var i = 0; i < NUM_CIRCLES; i++){
        var wall = new Circle(20);
        wall.setPosition(i * circleDiameter + RADIUS, 60);
        if(i % 2 == 0){
            wall.setColor(Color.red);
        }else{
            wall.setColor(Color.black);
        }
        add(wall);
    }
    for(var i = 0; i < NUM_CIRCLES; i++){
        var wall = new Circle(20);
        wall.setPosition(i * circleDiameter + RADIUS, 20);
        if(i % 2 == 0){
            wall.setColor(Color.red);
        }else{
            wall.setColor(Color.black);
        }
        add(wall);
    }
}
function buildWall(){
    for(var i = 0; i < NUM_CIRCLES; i++){
        var wall = new Circle(20);
        wall.setPosition(i * circleDiameter + RADIUS, height/2);
        if(i % 2 == 0){
            wall.setColor(Color.red);
        }else{
            wall.setColor(Color.black);
        }
        add(wall);
    }
}