拍摄精灵

Question

如果你按下左右键，我有一个精灵从左到右移动到屏幕的底部。

我希望能够从屏幕底部移动的精灵拍摄一些东西（我想要的任何精灵）并让精灵直接向上移动。

我怎么能这样做？

Answer 1

请勿复制并粘贴此内容，但在拆分这些类时，它会看起来像这样：

namespace SpaceInvadersGame 
{ 
    class Player : Microsoft.Xna.Framework.Game 
    { 
        Texture2D PlayerTexture; 
        Vector2 PlayerPosition; 

        public Player() 
        { 

        } 

        protected override void LoadContent() 
        { 
            PlayerTexture = Content.Load<Texture2D>(@"Images/freshman2");; 
            PlayerPosition = Vector2.Zero; 
            base.LoadContent(); 
        }

        public Vector2 GetPosition()
        {
            return this.PlayerPosition;
        }

        public void Update() 
        { 
            KeyboardState keyboardState = Keyboard.GetState(); 
            if (keyboardState.IsKeyDown(Keys.Left)) 
                freshamPos.X -= freshmanSpeed; 
            if (keyboardState.IsKeyDown(Keys.Right)) 
                freshamPos.X += freshmanSpeed;
            if(keyboardState.IsKeyDown(Keys.Space)) 
                theBullet = new Bullet(this);
        } 

        public void Draw(SpriteBatch SpriteBatch) 
        { 

        } 
    } 
}

namespace SpaceInvadersGame
{
    class Bullet : Microsoft.Xna.Framework.Game
    {
        Texture2D BulletTexture;
        Vector2 BulletPosition;
        Player thePlayer;

        public Bullet(Player player)
        {
            this.thePlayer = player;
        }

        protected override void LoadContent()
        {
            BulletTexture = Content.Load<Texture2D>(@"Images/bullet");;
            BulletPosition = thePlayer.GetPosition();
            base.LoadContent();
        }

        public void Update()
        {
            //in here is where you would just do something like:
            //BulletPosition.Y += 1;
        }

        public void Draw(SpriteBatch SpriteBatch)
        {

        }
    }
}