从Rectangle.Intersects（）获取碰撞详细信息

我有一个Breakout游戏，在该游戏中，有时会通过以下方式检测到球和桨之间的碰撞：

// Ball class
rectangle.Intersects(paddle.Rectangle);

有什么办法可以获取当前碰撞的确切坐标或有关碰撞的任何详细信息XNA API？

我考虑做一些基本的计算，例如比较碰撞时每个物体的精确坐标。它看起来像这样：

// Ball class
if((rectangle.X - paddle.Rectangle.X) < (paddle.Rectangle.Width / 2))
    // Collision happened on the left side
else
    // Collision happened on the right side

但是我不确定这是正确的方法。

你们对我可能要使用的引擎有任何提示吗？甚至使用这种方法的良好编码习惯？

XNA的矩形非常有限。该Rectangle.Intersects()方法仅返回布尔结果，因此如果需要详细信息，则需要自己进行更多测试。但是，您可以使用Rectangle.Intersect(Rectangle, Rectangle)方法获得两个重叠的矩形。至少，这将为您提供一些有关深度和位置的信息。

更新：如果您使用的是MonoGame，则从3.0 Beta开始Rectangle Rectangle.Intersect(rectangle, rectangle)不存在。您可以改用XNA Platformer套件中的以下代码。

您可以下载XNA Platformer入门套件（已移植到Windows 7）。它附带了一个辅助扩展方法，该方法返回一个描述两个矩形相交的矩形：

static class RectangleExtensions
    {
        /// <summary>
        /// Calculates the signed depth of intersection between two rectangles.
        /// </summary>
        /// <returns>
        /// The amount of overlap between two intersecting rectangles. These
        /// depth values can be negative depending on which wides the rectangles
        /// intersect. This allows callers to determine the correct direction
        /// to push objects in order to resolve collisions.
        /// If the rectangles are not intersecting, Vector2.Zero is returned.
        /// </returns>
        public static Vector2 GetIntersectionDepth(this Rectangle rectA, Rectangle rectB)
        {
            // Calculate half sizes.
            float halfWidthA = rectA.Width / 2.0f;
            float halfHeightA = rectA.Height / 2.0f;
            float halfWidthB = rectB.Width / 2.0f;
            float halfHeightB = rectB.Height / 2.0f;

            // Calculate centers.
            Vector2 centerA = new Vector2(rectA.Left + halfWidthA, rectA.Top + halfHeightA);
            Vector2 centerB = new Vector2(rectB.Left + halfWidthB, rectB.Top + halfHeightB);

            // Calculate current and minimum-non-intersecting distances between centers.
            float distanceX = centerA.X - centerB.X;
            float distanceY = centerA.Y - centerB.Y;
            float minDistanceX = halfWidthA + halfWidthB;
            float minDistanceY = halfHeightA + halfHeightB;

            // If we are not intersecting at all, return (0, 0).
            if (Math.Abs(distanceX) >= minDistanceX || Math.Abs(distanceY) >= minDistanceY)
                return Vector2.Zero;

            // Calculate and return intersection depths.
            float depthX = distanceX > 0 ? minDistanceX - distanceX : -minDistanceX - distanceX;
            float depthY = distanceY > 0 ? minDistanceY - distanceY : -minDistanceY - distanceY;
            return new Vector2(depthX, depthY);
        }

        /// <summary>
        /// Gets the position of the center of the bottom edge of the rectangle.
        /// </summary>
        public static Vector2 GetBottomCenter(this Rectangle rect)
        {
            return new Vector2(rect.X + rect.Width / 2.0f, rect.Bottom);
        }
}