示例#1
0
        /// <summary>
        /// Blend a color with another color
        /// </summary>
        /// <param name="color">Foreground color</param>
        /// <param name="behind">Background color</param>
        /// <returns></returns>
        public static Xamarin.Forms.Color Blend(this Xamarin.Forms.Color color, Xamarin.Forms.Color behind)
        {
            if (behind.A != 1)
            {
                behind = behind.Blend(Xamarin.Forms.Color.Black);
            }

            //return new Xamarin.Forms.Color(
            //        Math.Pow(Math.Pow(color.R, 2.2) * color.A + Math.Pow(behind.R, 2.2) * (1 - color.A), 1 / 2.2),
            //        Math.Pow(Math.Pow(color.G, 2.2) * color.A + Math.Pow(behind.G, 2.2) * (1 - color.A), 1 / 2.2),
            //        Math.Pow(Math.Pow(color.B, 2.2) * color.A + Math.Pow(behind.B, 2.2) * (1 - color.A), 1 / 2.2)
            //    );
            return(new Xamarin.Forms.Color(
                       color.R * color.A + behind.R * (1 - color.A),
                       color.G * color.A + behind.G * (1 - color.A),
                       color.B * color.A + behind.B * (1 - color.A)
                       ));
        }