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‎.gitignore‎

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.vs/
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.git/
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bin_Debug/
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bin_Release/
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*.user

‎ClrHlp.cs‎

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using System;
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using System.Collections.Generic;
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using System.Globalization;
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using System.Linq;
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using System.Text;
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using System.Text.RegularExpressions;
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using System.Threading.Tasks;
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using System.Windows.Media;
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namespace WPFColorLib
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{
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public class ClrHlp
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{
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public static (int, int, int) ColorToHSL(Color rgb)
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{
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var r = (rgb.R / 255.0);
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var g = (rgb.G / 255.0);
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var b = (rgb.B / 255.0);
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var min = Math.Min(Math.Min(r, g), b);
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var max = Math.Max(Math.Max(r, g), b);
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var delta = max - min;
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var lum = (max + min) / 2;
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double hue, sat;
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if (delta == 0)
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{
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hue = 0.0;
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sat = 0.0;
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}
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else
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{
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sat = (lum <= 0.5) ? (delta / (max + min)) : (delta / (2 - max - min));
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if (r == max)
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{
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hue = ((g - b) / 6.0) / delta;
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}
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else if (g == max)
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{
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hue = (1.0 / 3.0) + ((b - r) / 6.0) / delta;
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}
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else
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{
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hue = (2.0 / 3.0) + ((r - g) / 6.0) / delta;
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}
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if (hue < 0)
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hue += 1;
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if (hue > 1)
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hue -= 1;
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}
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return ((int)(hue*360), (int)(sat*100), (int)(lum*100));
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}
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public static Regex reHexRGB = new Regex(@"([a-f0-9]{2})([a-f0-9]{2})([a-f0-9]{2})", RegexOptions.Compiled | RegexOptions.IgnoreCase);
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public static Color Hex2color(string s)
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{
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var m = reHexRGB.Match(s);
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if (m.Success)
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return Color.FromRgb(Hex2Byte(m.Groups[1].Value), Hex2Byte(m.Groups[2].Value), Hex2Byte(m.Groups[3].Value));
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throw new ArgumentException($"Invalid hex RGB value '{s}'");
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}
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public static string Color2hex(Color clr)
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{
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return clr.R.ToString("X02") + clr.G.ToString("X02") + clr.B.ToString("X02");
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}
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public static byte Hex2Byte(string hex)
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{
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return byte.Parse(hex, NumberStyles.AllowHexSpecifier);
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}
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public static int HSL2RGBInt(int h, int s, int l)
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{
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var rgb = HSL2RGB(h, s, l);
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return rgb[0] << 16 | rgb[1] << 8 | rgb[2];
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}
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public static int[] HSL2RGB(int h, int s, int l)
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{
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var rgb = new int[3];
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var baseColor = (h + 60) % 360 / 120;
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var shift = (h + 60) % 360 - (120 * baseColor + 60);
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var secondaryColor = (baseColor + (shift >= 0 ? 1 : -1) + 3) % 3;
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//Setting Hue
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rgb[baseColor] = 255;
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rgb[secondaryColor] = (int)((Math.Abs(shift) / 60.0f) * 255.0f);
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//Setting Saturation
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for (var i = 0; i < 3; i++)
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rgb[i] += (int)((255 - rgb[i]) * ((100 - s) / 100.0f));
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//Setting Value
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for (var i = 0; i < 3; i++)
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rgb[i] -= (int)(rgb[i] * (100 - l) / 100.0f);
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return rgb;
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}
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}
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}

‎HSLColorSelector.xaml‎

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<UserControl x:Class="WPFColorLib.HSLColorSelector" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
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SizeChanged="Control_Resized">
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<DockPanel>
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<StackPanel DockPanel.Dock="Top">
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<Slider Name="slidHue" Maximum="359" TickFrequency="10" TickPlacement="BottomRight" />
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<Border Name="brdHue" BorderThickness="1" BorderBrush="DarkGray" Margin="1">
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<Image Name="imgHue" Height="20" />
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</Border>
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</StackPanel>
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<Border Name="brdSaturLight" BorderThickness="1" BorderBrush="DarkGray" Margin="1">
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<Grid>
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<Image Name="imgSaturLight" MinHeight="100" MouseDown="imgSaturLight_MouDown" MouseMove="imgSaturLight_MouMove" MouseUp="imgSaturLight_MouUp" />
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<Canvas Name="cnvSaturLight">
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<Ellipse Name="ellClrTarget" Width="7" Height="7" StrokeThickness="2" Stroke="Aqua" />
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</Canvas>
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</Grid>
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</Border>
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</DockPanel>
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</UserControl>

‎HSLColorSelector.xaml.cs‎

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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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using System.Windows;
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using System.Windows.Controls;
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using System.Windows.Input;
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using System.Windows.Media;
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using System.Windows.Media.Imaging;
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using System.Windows.Shapes;
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namespace WPFColorLib
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{
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public partial class HSLColorSelector : UserControl
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{
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public HSLColorSelector()
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{
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InitializeComponent();
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slidHue.ValueChanged += SlidHue_ValueChanged;
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}
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public event EventHandler<Tuple<byte, byte, byte>> ColorRGBChanged;
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public event EventHandler<Tuple<int, int, int>> ColorHSLChanged;// 0..360, 0..100, 0..100
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void Control_Resized(object sender, SizeChangedEventArgs e)
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{
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#region recreate hue bar
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var imgW = (int)(brdHue.ActualWidth - 2);
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var imgH = (int)(brdHue.ActualHeight - 2);
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imgHue.Source = new WriteableBitmap(imgW, imgH, 96, 96, PixelFormats.Bgr32, null);
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DrawHueBar();
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#endregion
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#region recreate Saturation/Lightness area
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imgW = (int)(brdSaturLight.ActualWidth - 2);
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imgH = (int)(brdSaturLight.ActualHeight - 2);
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imgSaturLight.Source = new WriteableBitmap(imgW, imgH, 96, 96, PixelFormats.Bgr32, null);
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RedrawSaturLight(slidHue.Value);
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#endregion
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}
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void DrawHueBar()
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{
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var recW = (int)(brdHue.ActualWidth - 2);
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var recH = (int)(brdHue.ActualHeight - 2);
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var k = 360.0 / recW;
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var bmp = (WriteableBitmap)imgHue.Source;
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bmp.Lock();
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unsafe {
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var buf = bmp.BackBuffer;
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// fill the first line of hue bar
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for(int x=0; x < recW; x++){
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int hue = (int)Math.Floor(x * k);
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*((int*)(buf + x * 4)) = ClrHlp.HSL2RGBInt(hue, 100, 100);
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}
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var origColorLine = new Span<byte>(buf.ToPointer(), bmp.BackBufferStride);
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for (int y = 1; y < recH; y++) {
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var destColorLine = new Span<byte>((buf + y * bmp.BackBufferStride).ToPointer(), bmp.BackBufferStride);
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origColorLine.CopyTo(destColorLine);
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}
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}
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bmp.AddDirtyRect(new Int32Rect(0, 0, recW, recH));
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bmp.Unlock();
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}
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void SlidHue_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e)
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{
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RedrawSaturLight(e.NewValue);
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// calc contrast color for ellipse(target above color)
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var contrastHue = ((int)e.NewValue + 180) % 360;// opposite side of color ring
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var contrastColor = ClrHlp.HSL2RGB(contrastHue, 100, 100);
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ellClrTarget.Stroke = new SolidColorBrush(Color.FromRgb((byte)contrastColor[0], (byte)contrastColor[1], (byte)contrastColor[2]));
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}
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void RedrawSaturLight(double newHue)
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{
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var hue = (int)newHue;
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var recW = (int)(brdSaturLight.ActualWidth - 2);
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var recH = (int)(brdSaturLight.ActualHeight - 2);
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var kX = 100.0 / recW;
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var kY = 100.0 / recH;
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var bmp = (WriteableBitmap)imgSaturLight.Source;
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bmp.Lock();
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unsafe {
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var buf = bmp.BackBuffer;
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for (int y = 0; y < recH; y++) {
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var lineStart = buf + y * bmp.BackBufferStride;
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for (int x = 0; x < recW; x++) {
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*((int*)(lineStart + x * 4)) = ClrHlp.HSL2RGBInt(hue, (int)(kX * x), (int)(kY * y));
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}
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}
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}
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bmp.AddDirtyRect(new Int32Rect(0, 0, recW, recH));
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bmp.Unlock();
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}
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bool trackColorMode = false;
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void imgSaturLight_MouDown(object sender, MouseButtonEventArgs e)
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{
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trackColorMode = true;
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imgSaturLight.CaptureMouse();
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SelectNewColor(e.GetPosition(imgSaturLight));
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}
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void imgSaturLight_MouMove(object sender, MouseEventArgs e)
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{
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if (!trackColorMode) return;
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SelectNewColor(e.GetPosition(imgSaturLight));
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}
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void SelectNewColor(Point mou)
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{
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var recW = (int)(brdSaturLight.ActualWidth - 2);
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var recH = (int)(brdSaturLight.ActualHeight - 2);
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var kX = 100.0 / recW;
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var kY = 100.0 / recH;
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if (mou.X < 0)
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mou.X = 0;
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else if (mou.X >= recW)
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mou.X = recW - 1;
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if (mou.Y < 0)
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mou.Y = 0;
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else if (mou.Y >= recH)
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mou.Y = recH - 1;
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Canvas.SetLeft(ellClrTarget, mou.X-2);
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Canvas.SetTop(ellClrTarget, mou.Y-2);
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var hue = (int)slidHue.Value;
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var sat = (int)(mou.X * kX);
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var lum = (int)(mou.Y * kY);
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ColorHSLChanged?.Invoke(this, new Tuple<int, int, int>(hue, sat, lum));
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if (ColorRGBChanged != null) {
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var clr = ClrHlp.HSL2RGB(hue, sat, lum);
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ColorRGBChanged.Invoke(this, new Tuple<byte, byte, byte>((byte)clr[0], (byte)clr[1], (byte)clr[2]));
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}
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}
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void imgSaturLight_MouUp(object sender, MouseButtonEventArgs e)
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{
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trackColorMode = false;
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imgSaturLight.ReleaseMouseCapture();
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}
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}
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}

‎Properties/AssemblyInfo.cs‎

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using System.Reflection;
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using System.Resources;
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using System.Runtime.CompilerServices;
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using System.Runtime.InteropServices;
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using System.Windows;
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// General Information about an assembly is controlled through the following
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// set of attributes. Change these attribute values to modify the information
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// associated with an assembly.
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[assembly: AssemblyTitle("WPFColorLib")]
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[assembly: AssemblyDescription("")]
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[assembly: AssemblyConfiguration("")]
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[assembly: AssemblyCompany("")]
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[assembly: AssemblyProduct("WPFColorLib")]
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[assembly: AssemblyCopyright("Copyright © 2022")]
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[assembly: AssemblyTrademark("")]
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[assembly: AssemblyCulture("")]
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// Setting ComVisible to false makes the types in this assembly not visible
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// to COM components. If you need to access a type in this assembly from
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// COM, set the ComVisible attribute to true on that type.
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[assembly: ComVisible(false)]
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//In order to begin building localizable applications, set
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//<UICulture>CultureYouAreCodingWith</UICulture> in your .csproj file
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//inside a <PropertyGroup>. For example, if you are using US english
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//in your source files, set the <UICulture> to en-US. Then uncomment
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//the NeutralResourceLanguage attribute below. Update the "en-US" in
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//the line below to match the UICulture setting in the project file.
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//[assembly: NeutralResourcesLanguage("en-US", UltimateResourceFallbackLocation.Satellite)]
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[assembly:ThemeInfo(
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ResourceDictionaryLocation.None, //where theme specific resource dictionaries are located
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//(used if a resource is not found in the page,
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// or application resource dictionaries)
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ResourceDictionaryLocation.SourceAssembly //where the generic resource dictionary is located
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//(used if a resource is not found in the page,
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// app, or any theme specific resource dictionaries)
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)]
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// Version information for an assembly consists of the following four values:
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//
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// Major Version
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// Minor Version
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// Build Number
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// Revision
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//
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// You can specify all the values or you can default the Build and Revision Numbers
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// by using the '*' as shown below:
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// [assembly: AssemblyVersion("1.0.*")]
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[assembly: AssemblyVersion("1.0.0.0")]
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[assembly: AssemblyFileVersion("1.0.0.0")]

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