using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;

namespace ButtonTest
{
    public class EnemyShip
    {
        protected Vector2 location;
        protected Texture2D image;
        protected bool attacking;
        protected int layer;

        protected int formationPosition;

        protected bool movingRight=true;

        public virtual void Draw(GameTime gameTime)
        {
        }

        public virtual void Update(GameTime gameTime)
        {
            if (!attacking)
            {
                if (movingRight)
                {
                    location.X = location.X + 1;
                }
                else
                {
                    location.X = location.X - 1;
                }
            }
        }
    }

    public class BlueShip : EnemyShip
    {
        public override void Update(GameTime gameTime)
        {
            // I fly straight down
            if (attacking)
            {
                location.Y = location.Y + 1;
            }

            base.Update(gameTime);
        }
    }

    public class RedShip : EnemyShip
    {
        public override void Update(GameTime gameTime)
        {
            // I fly down and right
            if (attacking)
            {
                location.Y = location.Y + 1;
                location.X = location.X + 1;
            }

            base.Update(gameTime);
        }
    }

    public class YellowShip : EnemyShip
    {
        public override void Update(GameTime gameTime)
        {
            // I fly straight down and to the left
            if (attacking)
            {
                location.Y = location.Y + 1;
                location.X = location.X - 1;
            }

            base.Update(gameTime);
        }
    }

    public class MyGame
    {
        // hypothetical game init
        EnemyShip[] ships = new EnemyShip[42];
        private void GameInit()
        {
            ships[0] = new BlueShip();
            ships[1] = new RedShip();
        }

        private void Update(GameTime gameTime)
        {
            int i;
            for (i = 0; i < ships.Length; i++)
            {
                if (ships[i] != null)
                {
                    ships[i].Update(gameTime);
                }
            }
        }
    }
}