Returns a Color struct based on HSL model. - CSharp System.Drawing

CSharp examples for System.Drawing:Color Convert

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Description

Returns a Color struct based on HSL model.

Demo Code

// Copyright (c) Microsoft. All rights reserved.
using Windows.UI;
using System.Reflection;
using System;//from w ww .  j  a  v  a 2  s.co m

public class Main{
        /// <summary>
        /// Returns a Color struct based on HSL model.
        /// </summary>
        /// <param name="hue">0..360 range hue</param>
        /// <param name="saturation">0..1 range saturation</param>
        /// <param name="lightness">0..1 range lightness</param>
        /// <param name="alpha">0..1 alpha</param>
        /// <returns>A Color object</returns>
        public static Color FromHsl(double hue, double saturation, double lightness, double alpha = 1.0)
        {
            if (hue < 0 || hue > 360)
            {
                throw new ArgumentOutOfRangeException(nameof(hue));
            }

            double chroma = (1 - Math.Abs((2 * lightness) - 1)) * saturation;
            double h1 = hue / 60;
            double x = chroma * (1 - Math.Abs((h1 % 2) - 1));
            double m = lightness - (0.5 * chroma);
            double r1, g1, b1;

            if (h1 < 1)
            {
                r1 = chroma;
                g1 = x;
                b1 = 0;
            }
            else if (h1 < 2)
            {
                r1 = x;
                g1 = chroma;
                b1 = 0;
            }
            else if (h1 < 3)
            {
                r1 = 0;
                g1 = chroma;
                b1 = x;
            }
            else if (h1 < 4)
            {
                r1 = 0;
                g1 = x;
                b1 = chroma;
            }
            else if (h1 < 5)
            {
                r1 = x;
                g1 = 0;
                b1 = chroma;
            }
            else
            {
                r1 = chroma;
                g1 = 0;
                b1 = x;
            }

            byte r = (byte)(255 * (r1 + m));
            byte g = (byte)(255 * (g1 + m));
            byte b = (byte)(255 * (b1 + m));
            byte a = (byte)(255 * alpha);

            return Color.FromArgb(a, r, g, b);
        }
}

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