PixelFarm.Drawing.RectangleF.Union C# (CSharp) Method

        public static RectangleF Union(RectangleF a, RectangleF b)
        {
            return FromLTRB(Math.Min(a.Left, b.Left),
                     Math.Min(a.Top, b.Top),
                     Math.Max(a.Right, b.Right),
                     Math.Max(a.Bottom, b.Bottom));
        }