#region Reference to system libraries
    using System;
    using System.Collections.Generic;
    using Microsoft.Xna.Framework;
    using Microsoft.Xna.Framework.Audio;
    using Microsoft.Xna.Framework.Content;
    using Microsoft.Xna.Framework.GamerServices;
    using Microsoft.Xna.Framework.Graphics;
    using Microsoft.Xna.Framework.Input;
    using Microsoft.Xna.Framework.Net;
    using Microsoft.Xna.Framework.Storage;
#endregion

// Label A: Reference to XNACS1Lib
using XNACS1Lib;

namespace XNACS1Lib_Start
{
    /// Label B: Subclass from XNACS1Base
    public class Game1 : XNACS1Base
    {
        XNACS1Circle c1;
        // Label C: InitializeWorld() function
        protected override void  InitializeWorld()
        {
            // 1. Set the coordinate system to work with
            World.SetWorldCoordinate(new Vector2(-1.0f, -1.0f), 15.0f);
                    
            // 2. Set the background color
            World.SetBackgroundColor(Color.LightBlue);

            Vector2 pos = new Vector2();

            // 3. Create 3 circles
            pos = (World.WorldMax + World.WorldMin) / 2.0f;
            XNACS1Circle center = new XNACS1Circle(pos, 1.0f);
            c1 = center;

            pos = new Vector2(0, 0);
            XNACS1Circle LowerLeft = new XNACS1Circle(pos, 1.0f);

            pos = World.WorldMax;
            XNACS1Circle UpperRight = new XNACS1Circle(pos, 1.0f);
        }
       
        // Label D: UpdateWorld() function
        protected override void UpdateWorld()
        {
            if (GamePad.ButtonBackClicked())
                this.Exit();

            c1.CenterX += GamePad.ThumbSticks.Right.X;

            EchoToTopStatus("Top Status: " + World.WorldMax);
            EchoToBottomStatus("Bottom Status: " + World.WorldMin);
        }
        
    }
}