使用SpriteBatch在XNA中繪制矩形

Question

我試圖使用spritebatch在XNA中繪制一個矩形形狀。 我有以下代碼：

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

但由於某種原因，它沒有任何吸引力。 知道什么是錯的嗎？ 謝謝！

Answer 1

這是您可以放入從Game派生的類的代碼。 這演示了在何處以及如何創建白色1像素方形紋理（以及在完成后如何處理它）。 然后你可以在繪制時如何縮放和着色紋理。

對於繪制平面顏色的矩形，此方法優於以所需大小創建紋理本身。

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();
}

Answer 2

您的紋理沒有任何數據。 您需要設置像素數據：

 Texture2D rect = new Texture2D(graphics.GraphicsDevice, 80, 30);

 Color[] data = new Color[80*30];
 for(int i=0; i < data.Length; ++i) data[i] = Color.Chocolate;
 rect.SetData(data);

 Vector2 coor = new Vector2(10, 20);
 spriteBatch.Draw(rect, coor, Color.White);

Answer 3

我剛剛制作了一些非常簡單的東西，你可以用你的Draw方法調用它。 您可以輕松創建任何尺寸的矩形：

private static Texture2D rect;

private void DrawRectangle(Rectangle coords, Color color)
{
    if(rect == null)
    {
        rect = new Texture2D(ScreenManager.GraphicsDevice, 1, 1);
        rect.SetData(new[] { Color.White });
    }
    spriteBatch.Draw(rect, coords, color);
}

用法：

DrawRectangle(new Rectangle((int)playerPos.X, (int)playerPos.Y, 5, 5), Color.Fuchsia);