XdCxRhDW/XdCxRhDW.Sender/ColorRGB.cs

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace XdCxRhDW.Sender
{
    public struct ColorRGB
    {
        public byte R;
        public byte G;
        public byte B;

        public ColorRGB(Color value)
        {
            this.R = value.R;
            this.G = value.G;
            this.B = value.B;
        }

        public static implicit operator Color(ColorRGB rgb)
        {
            Color c = Color.FromArgb(rgb.R, rgb.G, rgb.B);
            return c;
        }
        public static explicit operator ColorRGB(Color c)
        {
            return new ColorRGB(c);
        }
        /// <summary>
        /// HSL颜色转RGB
        /// </summary>
        /// <param name="h">色相0-1</param>
        /// <param name="sl">饱和度0-1</param>
        /// <param name="l">透明度0-1</param>
        /// <returns></returns>
        public static ColorRGB HSL2RGB(double h, double sl, double l)
        {
            double v;
            double r, g, b;
            r = l;   // default to gray
            g = l;
            b = l;
            v = (l <= 0.5) ? (l * (1.0 + sl)) : (l + sl - l * sl);
            if (v > 0)
            {
                double m;
                double sv;
                int sextant;
                double fract, vsf, mid1, mid2;
                m = l + l - v;
                sv = (v - m) / v;
                h *= 6.0;
                sextant = (int)h;
                fract = h - sextant;
                vsf = v * sv * fract;
                mid1 = m + vsf;
                mid2 = v - vsf;
                switch (sextant)
                {
                    case 0:

                        r = v;
                        g = mid1;
                        b = m;
                        break;
                    case 1:

                        r = mid2;
                        g = v;
                        b = m;
                        break;
                    case 2:

                        r = m;
                        g = v;
                        b = mid1;
                        break;

                    case 3:
                        r = m;
                        g = mid2;
                        b = v;
                        break;
                    case 4:
                        r = mid1;
                        g = m;
                        b = v;
                        break;
                    case 5:
                        r = v;
                        g = m;
                        b = mid2;
                        break;
                }

            }
            ColorRGB rgb;
            rgb.R = Convert.ToByte(r * 255.0f);
            rgb.G = Convert.ToByte(g * 255.0f);
            rgb.B = Convert.ToByte(b * 255.0f);
            return rgb;
        }

        /// <summary>
        /// 根据一个值生成一个颜色,值越小颜色越浅
        /// </summary>
        /// <param name="value">0-1的一个值</param>
        /// <returns></returns>
        public static Color GetSpecColor(double value)
        {
            if (value == 1)
                value = 0.99;
            return HSL2RGB(value, value, 0.5);
           
        }

        public static void RGB2HSL(ColorRGB rgb, out double h, out double s, out double l)
        {
            double r = rgb.R / 255.0;
            double g = rgb.G / 255.0;
            double b = rgb.B / 255.0;
            double v;
            double m;
            double vm;
            double r2, g2, b2;
            h = 0; // default to black
            s = 0;
            l = 0;
            v = Math.Max(r, g);
            v = Math.Max(v, b);
            m = Math.Min(r, g);
            m = Math.Min(m, b);
            l = (m + v) / 2.0;
            if (l <= 0.0)
            {
                return;
            }
            vm = v - m;
            s = vm;
            if (s > 0.0)
            {
                s /= (l <= 0.5) ? (v + m) : (2.0 - v - m);
            }
            else
            {
                return;
            }
            r2 = (v - r) / vm;
            g2 = (v - g) / vm;
            b2 = (v - b) / vm;
            if (r == v)
            {
                h = (g == m ? 5.0 + b2 : 1.0 - g2);
            }
            else if (g == v)
            {
                h = (b == m ? 1.0 + r2 : 3.0 - b2);
            }
            else
            {
                h = (r == m ? 3.0 + g2 : 5.0 - r2);
            }
            h /= 6.0;
        }
    }
}