Making sense of Azure's Recognize Text computer vision cognitive service Line and Word BoundingBox array of longs property.

BoundingBoxLogic.cs

public static void GetBoxCoordinates(long[] longs, out (Point TopLeft, Point TopRight, Point BottomRight, Point BottomLeft) corners, out Size size, out double angle)
{
    if (longs.Length != 8)
    {
        throw new ArgumentOutOfRangeException(nameof(longs));
    }
    corners = (
        new Point((int)longs[0], (int)longs[1]),
        new Point((int)longs[2], (int)longs[3]),
        new Point((int)longs[4], (int)longs[5]),
        new Point((int)longs[6], (int)longs[7]));
    var width = Math.Abs(corners.TopRight.X - corners.TopLeft.X);
    var height = Math.Abs(corners.BottomLeft.Y - corners.TopLeft.Y);
    size = new Size(width, height);
    var sign = corners.TopLeft.Y > corners.TopRight.Y ? -1 : 1;
    angle = sign * Math.Atan2(size.Height, size.Width) * (180 / Math.PI);
}