Enemy.cs

#region Using Statements
using System;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
#endregion

namespace Application
{
    public class Enemy
    {
        protected Vector2 position = Vector2.Zero;
        protected Texture2D texture = null;

        protected float speed = 150.0f;

        float shootTimer = 0;

        protected bool isDead = true;
        public bool IsDead {
            get { return isDead; }
            set { isDead = value; }
        }

        public Texture2D Texture {
            get { return texture; }
            set { texture = value; }
        }

        public Vector2 Position {
            get { return position; }
            set { position = value; }
        }

        public Rectangle Bounds {
            get { return new Rectangle ((int)position.X, (int)position.Y, texture.Bounds.Width, texture.Bounds.Height); }
        }

        public Enemy ()
        {
        }

        public void Update( float deltaTime )
        {
            if (isDead == true)
                return;

            position.Y += speed * deltaTime;

            if (shootTimer < 0)
                shootTimer -= deltaTime;

            if (Game1.player.Position.X < position.X + texture.Width && Game1.player.Position.X > position.X) {
                if (shootTimer <= 0) {
                    foreach (Bullet b in Game1.bullets) {
                        if (b.IsDead == true) {
                            b.IsDead = false;
                            b.Position = Position;
                            b.isFromPlayer = false;
                            break;
                        }
                    }

                    shootTimer = 0.5f;
                }
            }

            if( CheckCollisions () == true)
            {
                isDead = true;
            }
        }


        public bool CheckCollisions()
        {
            Rectangle bounds = Bounds;
            //check all bullets
            foreach (Bullet b in Game1.bullets) {
            if (b.IsDead == false && b.isFromPlayer == true && bounds.Intersects (b.Bounds) == true) {
                    b.IsDead = true;
                    return true;
                }
            }

            return false;

        }

        public void Draw(SpriteBatch spritebatch)
        {

            if (isDead == true)
                return;
            if (texture == null)
                return;

            spritebatch.Draw (texture, position, Color.White);
        }
    }
}