将HSV循环代码从Delphi转换为C#

现在代码:(适用于任何规模)

这是HSL,但是我给你了你有其他算法的网址.

using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Windows;
using System.Windows.Media;
using System.Windows.Media.Imaging;

namespace ColorWheel
{
    /// <summary>
    ///   Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void BuildWheel()
        {
            var width = 1024;
            var height = width;
            var cx = width/2;
            var cy = height/2;
            var colors = new int[width*height];
            var gray = Colors.Gray.ToBgr32();
            for (int index = 0; index < colors.Length; index++) colors[index] = gray;

            var radius = cx;
            var radiusSquared = radius*radius;
            for (int i = 0; i < height; i++)
            {
                for (int j = 0; j < width; j++)
                {
                    var x = j - cx;
                    var y = i - cy;
                    var distanceSquared = (double) x*x + y*y;
                    if (distanceSquared <= radiusSquared) // In circle
                    {
                        var h = Math.Atan2(x,y).ToDegrees() + 180.0d; // Angle
                        var s = 1.0d;
                        var l = (1.0d - ((1.0d/radiusSquared)*distanceSquared)); // 1 - (distance normalized)
                        var hsl = new HSL((float) h,(float) s,(float) l);
                        var rgb = RGB.FromHsl(hsl.H,hsl.S,hsl.L);
                        colors[i*width + j] = rgb.R << 16 | rgb.G << 8 | rgb.B;
                    }
                }
            }
            var bitmap = new WriteableBitmap(width,height,96,PixelFormats.Bgr32,null);
            bitmap.WritePixels(new Int32Rect(0,width,height),colors,width*4,0);
            image.Source = bitmap;
        }

        private void Window_Loaded(object sender,RoutedEventArgs e)
        {
            BuildWheel();
        }
    }

    public static class Helpers
    {
        public static double ToDegrees(this double radians)
        {
            return radians*57.2957795130823; // radians * (180.0d / Math.PI)
        }

        public static double ToRadians(this double degrees)
        {
            return degrees*0.0174532925199433; // degrees * (Math.PI / 180.0d)
        }
    }

    public static class ColorExtensions
    {
        public static Color FromBgr32(this Int32 color)
        {
            return Color.FromRgb((byte) ((color & 0xFF0000) >> 16),(byte) ((color & 0xFF00) >> 8),(byte) (color & 0xFF));
        }

        public static int ToBgr32(this Color color)
        {
            return color.R << 16 | color.G << 8 | color.B;
        }
    }

    /// <summary>
    ///   Represents a color in an HSL space.
    /// </summary>
    [StructLayout(LayoutKind.Sequential)]
    public struct HSL
    {
        [DebuggerBrowsable(DebuggerBrowsableState.Never)] private readonly double _h;

        [DebuggerBrowsable(DebuggerBrowsableState.Never)] private readonly double _s;

        [DebuggerBrowsable(DebuggerBrowsableState.Never)] private readonly double _l;

        /// <summary>
        ///   Returns the fully qualified type name of this instance.
        /// </summary>
        /// <returns> A <see cref="T:System.String" /> containing a fully qualified type name. </returns>
        /// <filterpriority>2</filterpriority>
        public override string ToString()
        {
            return string.Format("H: {0},S: {1},L: {2}",_h,_s,_l);
        }

        /// <summary>
        ///   Create a new instance of <see cref="HSL" /> .
        /// </summary>
        /// <param name="h"> Value of <see cref="H" /> component. </param>
        /// <param name="s"> Value of <see cref="S" /> component. </param>
        /// <param name="l"> Value of <see cref="L" /> component. </param>
        public HSL(double h,double s,double l)
        {
            _h = h;
            _s = s;
            _l = l;
        }

        /// <summary>
        ///   Gets the value of the hue component.
        /// </summary>
        public double H
        {
            get { return _h; }
        }

        /// <summary>
        ///   Gets the value of the saturation component.
        /// </summary>
        public double S
        {
            get { return _s; }
        }

        /// <summary>
        ///   Gets the value of the lightness component.
        /// </summary>
        public double L
        {
            get { return _l; }
        }

        public override bool Equals(object obj)
        {
            if (ReferenceEquals(null,obj)) return false;
            if (obj.GetType() != typeof (HSL)) return false;
            return Equals((HSL) obj);
        }

        public bool Equals(HSL other)
        {
            return other._h.Equals(_h) && other._l.Equals(_l) &&
                   other._s.Equals(_s);
        }

        /// <summary>
        ///   Create a new instance of <see cref="HSL" />,from RGB values.
        /// </summary>
        /// <param name="red"> Value of the red component. </param>
        /// <param name="green"> Value of the green component. </param>
        /// <param name="blue"> Value of the blue component. </param>
        /// <returns> <see cref="HSL" /> instance created. </returns>
        public static HSL FromRGB(byte red,byte green,byte blue)
        {
            var r1 = red/255.0d;
            var g1 = green/255.0d;
            var b1 = blue/255.0d;

            var min = Math.Min(r1,Math.Min(g1,b1));
            var max = Math.Max(r1,Math.Max(g1,b1));

            var l = (max + min)/2.0d;

            var s = 0.0d;
            var h = 0.0d;
            if (min == max)
            {
                h = 0.0d;
                s = 0.0d;
            }
            else
            {
                if (l < 0.5d)
                {
                    s = (max - min)/(max + min);
                }
                else if (l >= 0.5d)
                {
                    s = (max - min)/(2.0d - max - min);
                }

                if (r1 == max)
                {
                    h = (g1 - b1)/(max - min);
                }
                else if (g1 == max)
                {
                    h = 2.0d + (b1 - r1)/(max - min);
                }
                else if (b1 == max)
                {
                    h = 4.0d + (r1 - g1)/(max - min);
                }
            }

            h *= 60.0d;

            if (h < 0.0d)
                h += 360.0d;

            return new HSL(h,s,l);
        }

        /// <summary>
        ///   Returns the hash code for this instance.
        /// </summary>
        /// <returns> A 32-bit signed integer that is the hash code for this instance. </returns>
        /// <filterpriority>2</filterpriority>
        public override int GetHashCode()
        {
            unchecked
            {
                var result = _h.GetHashCode();
                result = (result*397) ^ _l.GetHashCode();
                result = (result*397) ^ _s.GetHashCode();
                return result;
            }
        }


        public static BitmapSource GetHslPalette(int width = 360,int height = 100)
        {
            // Creates an HSL palette image like in Photoshop,etc ...
            var pixels = new int[width*height];
            const double saturation = 1.0d;
            for (var y = 0; y < height; y++)
            {
                for (var x = 0; x < width; x++)
                {
                    var hue = (1.0d/width)*x*360.0d;
                    var lightness = 1.0d - ((1.0f/height)*y);
                    var rgb = RGB.FromHsl(hue,lightness);
                    pixels[y*width + x] = 0xFF << 24 | rgb.R << 16 | rgb.G << 8 | rgb.B;
                }
            }
            return BitmapSource.Create(width,PixelFormats.Pbgra32,null,pixels,width*4);
        }

        public static bool operator ==(HSL left,HSL right)
        {
            return left.Equals(right);
        }

        public static bool operator !=(HSL left,HSL right)
        {
            return !left.Equals(right);
        }
    }

    /// <summary>
    ///   Represents a color in an RGB space.
    /// </summary>
    [StructLayout(LayoutKind.Sequential)]
    public struct RGB
    {
        [DebuggerBrowsable(DebuggerBrowsableState.Never)] private readonly byte _r;

        [DebuggerBrowsable(DebuggerBrowsableState.Never)] private readonly byte _g;

        [DebuggerBrowsable(DebuggerBrowsableState.Never)] private readonly byte _b;

        /// <summary>
        ///   Create a new instance of <see cref="RGB" /> .
        /// </summary>
        /// <param name="r"> Value of red component. </param>
        /// <param name="g"> Value of green component. </param>
        /// <param name="b"> Value of blue component. </param>
        public RGB(byte r,byte g,byte b)
        {
            _r = r;
            _g = g;
            _b = b;
        }

        /// <summary>
        ///   Returns the fully qualified type name of this instance.
        /// </summary>
        /// <returns> A <see cref="T:System.String" /> containing a fully qualified type name. </returns>
        /// <filterpriority>2</filterpriority>
        public override string ToString()
        {
            return string.Format("R: {0},G: {1},B: {2}",_r,_g,_b);
        }

        /// <summary>
        ///   Gets the value of the red component.
        /// </summary>
        public byte R
        {
            get { return _r; }
        }

        /// <summary>
        ///   Gets the value of the green component.
        /// </summary>
        public byte G
        {
            get { return _g; }
        }

        /// <summary>
        ///   Gets the value of the blue component.
        /// </summary>
        public byte B
        {
            get { return _b; }
        }

        public override bool Equals(object obj)
        {
            if (ReferenceEquals(null,obj)) return false;
            if (obj.GetType() != typeof (RGB)) return false;
            return Equals((RGB) obj);
        }

        public bool Equals(RGB other)
        {
            return other._b == _b && other._g == _g && other._r == _r;
        }

        /// <summary>
        ///   Create a new instance of <see cref="RGB" />,from HSL values.
        /// </summary>
        /// <param name="hue"> Hue,from 0.0 to 360.0. </param>
        /// <param name="saturation"> Saturation,from 0.0 to 1.0. </param>
        /// <param name="lightness"> Lightness,from 0.0 to 1.0. </param>
        /// <returns> <see cref="RGB" /> instance created. </returns>
        public static RGB FromHsl(double hue,double lightness)
        {
            if (hue < 0.0d || hue > 360.0d) throw new ArgumentOutOfRangeException("hue");
            if (saturation < 0.0d || saturation > 1.0d) throw new ArgumentOutOfRangeException("saturation");
            if (lightness < 0.0d || lightness > 1.0d) throw new ArgumentOutOfRangeException("lightness");

            if (saturation == 0.0d)
            {
                var b1 = (byte) (lightness*255);
                return new RGB(b1,b1);
            }

            var t2 = 0.0d;

            if (lightness < 0.5d)
                t2 = lightness*(1.0d + saturation);
            else if (lightness >= 0.5d)
                t2 = lightness + saturation - lightness*saturation;

            var t1 = 2.0d*lightness - t2;

            var h = hue/360.0d;

            var tr = h + 1.0d/3.0d;
            var tg = h;
            var tb = h - 1.0d/3.0d;

            tr = tr < 0.0d ? tr + 1.0d : tr > 1.0d ? tr - 1.0d : tr;
            tg = tg < 0.0d ? tg + 1.0d : tg > 1.0d ? tg - 1.0d : tg;
            tb = tb < 0.0d ? tb + 1.0d : tb > 1.0d ? tb - 1.0d : tb;

            double r;
            if (6.0d*tr < 1.0d)
                r = t1 + (t2 - t1)*6.0d*tr;
            else if (2.0d*tr < 1.0d)
                r = t2;
            else if (3.0d*tr < 2.0d)
                r = t1 + (t2 - t1)*((2.0d/3.0d) - tr)*6.0d;
            else
                r = t1;

            double g;
            if (6.0d*tg < 1.0d)
                g = t1 + (t2 - t1)*6.0d*tg;
            else if (2.0d*tg < 1.0d)
                g = t2;
            else if (3.0d*tg < 2.0d)
                g = t1 + (t2 - t1)*((2.0d/3.0d) - tg)*6.0d;
            else
                g = t1;

            double b;
            if (6.0d*tb < 1.0d)
                b = t1 + (t2 - t1)*6.0d*tb;
            else if (2.0d*tb < 1.0d)
                b = t2;
            else if (3.0d*tb < 2.0d)
                b = t1 + (t2 - t1)*((2.0d/3.0d) - tb)*6.0d;
            else
                b = t1;

            return new RGB((byte) (r*255),(byte) (g*255),(byte) (b*255));
        }

        /// <summary>
        ///   Returns the hash code for this instance.
        /// </summary>
        /// <returns> A 32-bit signed integer that is the hash code for this instance. </returns>
        /// <filterpriority>2</filterpriority>
        public override int GetHashCode()
        {
            unchecked
            {
                var result = _b.GetHashCode();
                result = (result*397) ^ _g.GetHashCode();
                result = (result*397) ^ _r.GetHashCode();
                return result;
            }
        }

        public static bool operator ==(RGB left,RGB right)
        {
            return left.Equals(right);
        }

        public static bool operator !=(RGB left,RGB right)
        {
            return !left.Equals(right);
        }
    }
}