XNA 第2課

Ref: XNA 4.0 Your First Game - XNA Game Studio in 2D
1. 準備 Test1.png
2. 方案總管 Content (右建)加入 現有項目(精靈圖檔Test1.png)
3. LoadContent 方法
    3.1 宣告全域變數
    Texture2D myTexture; //3-1
    Vector2 spritePosition = Vector2.Zero; // 3-2
    Vector2 spriteSpeed = new Vector2(250.0f, 0f); // 精靈速度 3-3
    protected override void LoadContent()
    {
        // Create a new SpriteBatch, which can be used to draw textures.
        spriteBatch = new SpriteBatch(GraphicsDevice);
        myTexture = Content.Load<Texture2D>("Test1"); // 3-4
    }
    4. Draw 方法
        4.1-4.3 繪出精靈(Sprite)
         spriteBatch.Begin(SpriteSortMode.BackToFront, BlendState.AlphaBlend); // 4.1
         spriteBatch.Draw(myTexture, spritePosition, Color.White); // 4.2
         spriteBatch.End(); // 4.3
    5. 移動精靈(Sprite)指令
        // TODO: Add your update logic here
            UpdateSprite(gameTime); // 5.1
            // -------- 自建更新方法
            base.Update(gameTime);
        }
        void UpdateSprite(GameTime gameTime)
        {
            // Move the sprite by speed, scaled by elapsed time.
            spritePosition += ... 略