c# - 使用 SpriteBatch 在 XNA 中绘制矩形

Question

我正在尝试使用 spritebatch 在 XNA 中绘制一个矩形。我有以下代码:

        Texture2D rect = new Texture2D(graphics.GraphicsDevice, 80, 30);
        Vector2 coor = new Vector2(10, 20);
        spriteBatch.Draw(rect, coor, Color.Chocolate);

但由于某种原因它没有绘制任何东西。知道出了什么问题吗？谢谢!

Answer 1

这是您可以放入从 Game 派生的类中的代码。这演示了在何处以及如何创建一个白色的 1 像素正方形纹理(以及完成后如何处理它)。以及如何在绘制时缩放和着色该纹理。

对于绘制纯色矩形，此方法比创建所需大小的纹理本身更可取。

SpriteBatch spriteBatch;
Texture2D whiteRectangle;

protected override void LoadContent()
{
    base.LoadContent();
    spriteBatch = new SpriteBatch(GraphicsDevice);
    // Create a 1px square rectangle texture that will be scaled to the
    // desired size and tinted the desired color at draw time
    whiteRectangle = new Texture2D(GraphicsDevice, 1, 1);
    whiteRectangle.SetData(new[] { Color.White });
}

protected override void UnloadContent()
{
    base.UnloadContent();
    spriteBatch.Dispose();
    // If you are creating your texture (instead of loading it with
    // Content.Load) then you must Dispose of it
    whiteRectangle.Dispose();
}

protected override void Draw(GameTime gameTime)
{
    base.Draw(gameTime);
    GraphicsDevice.Clear(Color.White);
    spriteBatch.Begin();

    // Option One (if you have integer size and coordinates)
    spriteBatch.Draw(whiteRectangle, new Rectangle(10, 20, 80, 30),
            Color.Chocolate);

    // Option Two (if you have floating-point coordinates)
    spriteBatch.Draw(whiteRectangle, new Vector2(10f, 20f), null,
            Color.Chocolate, 0f, Vector2.Zero, new Vector2(80f, 30f),
            SpriteEffects.None, 0f);

    spriteBatch.End();
}