c# 实现 HSV 调色板

界面相关核心代码如下：

public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            var rnd = new Random();
            var rgb = new ColorRGB(rnd.Next(0, 255), rnd.Next(0, 255), rnd.Next(0, 255));
            var hsv = ColorHelper.RgbToHsv(rgb);
            picDestinationColor.BackColor = Color.FromArgb(255, rgb.R, rgb.G, rgb.B);
            nudH.Value = hsv.H;
            nudS.Value = hsv.S;
            nudV.Value = hsv.V;
            refreshColorPanel(hsv);
            picPosH.Left = (int)(picH.Left + (picH.Width * nudH.Value / 360));
            picPosS.Left = (int)(picS.Left + (picS.Width * nudS.Value / 255));
            picPosV.Left = (int)(picV.Left + (picV.Width * nudV.Value / 255));
        }

        void refreshColorPanel(ColorHSV hsv)
        {
            var bm = new Bitmap(picH.Width, picH.Height);
            using (Graphics g = Graphics.FromImage(bm))
            {
                for (var i = 0; i < picH.Width; i++)
                {
                    var hsvColor = new ColorHSV(360 * i / picH.Width, 255, 255);
                    var rgbColor = ColorHelper.HsvToRgb(hsvColor);
                    var color = Color.FromArgb(255,rgbColor.R ,rgbColor.G ,rgbColor.B);
                    g.DrawLine(new Pen(color, 1), i, 0, i, picH.Height);
                }
                g.Save();
            }
            picH.Image = bm;

            bm = new Bitmap(picS.Width, picS.Height);
            using (Graphics g = Graphics.FromImage(bm))
            {
                for (var i = 0; i < picS.Width; i++)
                {
                    var hsvColor = new ColorHSV(hsv.H, 255 * i / picS.Width, hsv.V);
                    var rgbColor = ColorHelper.HsvToRgb(hsvColor);
                    var color = Color.FromArgb(255, rgbColor.R, rgbColor.G, rgbColor.B);
                    g.DrawLine(new Pen(color, 1), i, 0, i, picS.Height);
                }
                g.Save();
            }
            picS.Image = bm;

            bm = new Bitmap(picV.Width, picV.Height);
            using (Graphics g = Graphics.FromImage(bm))
            {
                for (var i = 0; i < picV.Width; i++)
                {
                    var hsvColor = new ColorHSV(hsv.H, hsv.S, 255 * i / picS.Width);
                    var rgbColor = ColorHelper.HsvToRgb(hsvColor);
                    var color = Color.FromArgb(255, rgbColor.R, rgbColor.G, rgbColor.B);
                    g.DrawLine(new Pen(color, 1), i, 0, i, picV.Height);
                }
                g.Save();
            }
            picV.Image = bm;

            var destRgbColor = ColorHelper.HsvToRgb(hsv);
            picDestinationColor.BackColor = Color.FromArgb(255, destRgbColor.R, destRgbColor.G, destRgbColor.B); ;
        }

        void colorChanged()
        {
            var hsv = new ColorHSV((int)nudH.Value, (int)nudS.Value, (int)nudV.Value);
            refreshColorPanel(hsv);
        }

        private void nudH_ValueChanged(object sender, EventArgs e)
        {
            colorChanged();
        }

        private void nudS_ValueChanged(object sender, EventArgs e)
        {
            colorChanged();
        }

        private void nudV_ValueChanged(object sender, EventArgs e)
        {
            colorChanged();
        }

        private void picH_MouseDown(object sender, MouseEventArgs e)
        {
            nudH.Value = (int)(360 * e.X / picH.Width);
            nudS.Value = nudS.Maximum;
            nudV.Value = nudV.Maximum;
            picPosH.Left = picH.Left + e.X;
        }

        private void picS_MouseDown(object sender, MouseEventArgs e)
        {
            nudS.Value = (int)(255 * e.X / picS.Width);
            picPosS.Left = picS.Left + e.X;
        }

        private void picV_MouseDown(object sender, MouseEventArgs e)
        {
            nudV.Value = (int)(255 * e.X / picV.Width);
            picPosV.Left = picV.Left + e.X;
        }
    }

    下面是实体类和一个工具类：

    #region RGB / HSV / HSL 颜色模型类
    /// <summary>
    /// 类      名：ColorHSL