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        protected override void Draw(GameTime gameTime)
        {
            GraphicsDevice.Clear(Color.Black);
            // TODO: Add your drawing code here
            spriteBatch.Begin(SpriteSortMode.Deferred, BlendState.AlphaBlend);
            //Sprite drawing goes here.  Z-index is worked out based on load order.  First loaded sprite goes to back.
            spriteBatch.Draw(backgroundImage, backgroundRectangle, Color.White);

            Vector2 playerOrigin = new Vector2(player.Sprite.Width / 2, player.Sprite.Height / 2);
            spriteBatch.Draw(player.Sprite, player.Location, null, Color.White, player.Rotation, playerOrigin, 1.0f, SpriteEffects.None, 0f);

            foreach (Fighter fighter in player.ActiveFighters)
            {
                fighter.ParticleEngine.Draw(spriteBatch);
                Vector2 fighterOrigin = new Vector2(fighter.Sprite.Width / 2, fighter.Sprite.Height / 2);
                spriteBatch.Draw(fighter.Sprite, fighter.Location, null, Color.White, fighter.Rotation, fighterOrigin, 1.0f, SpriteEffects.None, 0f);

                if (fighter.State == Fighter.StateEnum.Fighting)
                {
                    fireMainGun(fighter, fighter.Target);
                }
            }

            foreach (Enemy enemy in enemyList)
            {
                enemy.ParticleEngine.Draw(spriteBatch);
                Vector2 enemyOrigin = new Vector2(enemy.Sprite.Width / 2, enemy.Sprite.Height / 2);
                spriteBatch.Draw(enemy.Sprite, enemy.Location, null, Color.White, enemy.Rotation, enemyOrigin, 1.0f, SpriteEffects.None, 0f);

                if (enemy.State == Enemy.StateEnum.Fighting)
                {
                    fireMainGun(enemy, enemy.Target);
                }
            }

            spriteBatch.End();

            base.Draw(gameTime);
        }