Initial commit: application ColorPicker (palette, pipette ecran, couleur de dossier)

src/Palette.cs

@@ -0,0 +1,62 @@
+using System;
+using System.Collections.Generic;
+using System.Drawing;
+
+namespace ColorPickerApp
+{
+    /// <summary>Genere une palette complete (teintes x nuances + niveaux de gris).</summary>
+    internal static class Palette
+    {
+        public static List<Color> Generate()
+        {
+            var colors = new List<Color>();
+
+            const int hueSteps = 12;
+            const int shadeSteps = 8;
+
+            for (int s = 0; s < shadeSteps; s++)
+            {
+                double lightness = 0.90 - (s * (0.80 / (shadeSteps - 1)));
+                for (int h = 0; h < hueSteps; h++)
+                {
+                    double hue = (360.0 / hueSteps) * h;
+                    colors.Add(FromHsl(hue, 0.75, lightness));
+                }
+            }
+
+            const int grayCount = 12;
+            for (int g = 0; g < grayCount; g++)
+            {
+                int v = (int)Math.Round(255.0 * g / (grayCount - 1));
+                colors.Add(Color.FromArgb(v, v, v));
+            }
+
+            return colors;
+        }
+
+        private static Color FromHsl(double h, double s, double l)
+        {
+            double c = (1 - Math.Abs(2 * l - 1)) * s;
+            double x = c * (1 - Math.Abs((h / 60.0) % 2 - 1));
+            double m = l - c / 2;
+
+            double r1, g1, b1;
+            if (h < 60) { r1 = c; g1 = x; b1 = 0; }
+            else if (h < 120) { r1 = x; g1 = c; b1 = 0; }
+            else if (h < 180) { r1 = 0; g1 = c; b1 = x; }
+            else if (h < 240) { r1 = 0; g1 = x; b1 = c; }
+            else if (h < 300) { r1 = x; g1 = 0; b1 = c; }
+            else { r1 = c; g1 = 0; b1 = x; }
+
+            int r = (int)Math.Round((r1 + m) * 255);
+            int g = (int)Math.Round((g1 + m) * 255);
+            int b = (int)Math.Round((b1 + m) * 255);
+
+            r = Math.Max(0, Math.Min(255, r));
+            g = Math.Max(0, Math.Min(255, g));
+            b = Math.Max(0, Math.Min(255, b));
+
+            return Color.FromArgb(r, g, b);
+        }
+    }
+}