c# - 我似乎无法让我的精灵移动

Question

我是 c# 的新手（我昨天才开始学习）。我正在关注此链接的教程：http: //msdn.microsoft.com/en-us/library/bb203893.aspx。我遇到的问题是我似乎无法让我的精灵移动，甚至没有一个像素。（我已经阅读了这个主题并最终添加了一些没有真正帮助的东西）。这是我卡住的代码：

 void UpdateSprite(GameTime gameTime)
    {
        {
            Update(gameTime);
        }

        spritePosition +=
            spritePosition * (float)gameTime.ElapsedGameTime.TotalSeconds;

        int MaxX =
            graphics.GraphicsDevice.Viewport.Width - myTexture.Width;
        int MinX = 0;
        int MaxY =
            graphics.GraphicsDevice.Viewport.Height - myTexture.Height;
        int MinY = 0;


        if (spritePosition.X > MaxX)
        {
            spriteSpeed.X *= -1;
            spritePosition.X = MaxX;
        }

        else if (spritePosition.X < MinX)
        {
            spriteSpeed.X *= -1;
            spritePosition.X = MinX;
        }

        if (spritePosition.Y > MaxY)
        {
            spriteSpeed.Y *= -1;
            spritePosition.Y = MaxY;
        }

        else if (spritePosition.Y < MinY)
        {
            spriteSpeed.Y *= -1;
            spritePosition.Y = MinY;
        }


        // Allows the game to exit
        if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed)
            this.Exit();

        // TODO: Add your update logic here

        base.Update(gameTime);
    }

    /// <summary>
    /// This is called when the game should draw itself.
    /// </summary>
    /// <param name="gameTime">Provides a snapshot of timing values.</param>
    protected override void Draw(GameTime gameTime)
    {
        GraphicsDevice.Clear(Color.CornflowerBlue);


        spriteBatch.Begin(SpriteSortMode.BackToFront, BlendState.AlphaBlend);
        spriteBatch.Draw(myTexture, spritePosition, Color.White);
        spriteBatch.End();

        // TODO: Add your drawing code here

        base.Draw(gameTime);
    }
}

}

Answer 1

该声明应：

spritePosition += spritePosition * (float)gameTime.ElapsedGameTime.TotalSeconds;

应该改为：

spritePosition += spriteSpeed * (float)gameTime.ElapsedGameTime.TotalSeconds;