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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namespace RichCreator.Utility
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{
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public class ColorUtils
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{
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/// <summary>
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/// RGB转换为HSV颜色空间
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/// </summary>
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/// <param name="r">Range(0-255)</param>
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/// <param name="g">Range(0-255)</param>
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/// <param name="b">Range(0-255)</param>
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/// <param name="h">Range(0-1.0)</param>
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/// <param name="s">Range(0-1.0)</param>
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/// <param name="v">Range(0-1.0)</param>
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public static void RGBtoHSV(byte r, byte g, byte b, out float h, out float s, out float v)
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{
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float min, max, delta;
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min = Math.Min(r, Math.Min(g, b));
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max = Math.Max(r, Math.Max(g, b));
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v = max; // v
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delta = max - min;
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if (max != 0)
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{
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s = delta / max; // s
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}
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else
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{
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// r = g = b = 0 // s = 0, v is undefined
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s = 0;
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h = 0;
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return;
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}
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if (r == max)
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{
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h = delta == 0 ? 0 : (g - b) / delta;// between yellow & magenta
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}
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else if (g == max)
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{
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h = 2 + (b - r) / delta; // between cyan & yellow
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}
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else
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{
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h = 4 + (r - g) / delta; // between magenta & cyan
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}
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h *= 60; // degrees
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if (h < 0)
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{
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h += 360;
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}
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h = h / 360;
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v = v / 255;
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}
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/// <summary>
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/// HSV转换为RGB颜色空间
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/// </summary>
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/// <param name="h">Range(0.0~1.0)</param>
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/// <param name="s">Range(0.0~1.0)</param>
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/// <param name="v">Range(0.0~1.0)</param>
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/// <param name="r">Range(0~255)</param>
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/// <param name="g">Range(0~255)</param>
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/// <param name="b">Range(0~255)</param>
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public static void HSVtoRGB(float h, float s, float v, out byte r, out byte g, out byte b)
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{
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h = h * 360;
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v = v * 255;
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int i;
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float f, p, q, t;
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if (s == 0)
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{
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// achromatic (grey)
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r = g = b = (byte)Math.Round(v);
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return;
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}
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h /= 60; // sector 0 to 5
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i = (Int32)Math.Floor(h);
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f = h - i; // factorial part of h
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p = v * (1 - s);
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q = v * (1 - s * f);
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t = v * (1 - s * (1 - f));
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switch (i)
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{
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case 0:
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r = (byte)Math.Round(v);
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g = (byte)Math.Round(t);
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b = (byte)Math.Round(p);
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break;
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case 1:
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r = (byte)Math.Round(q);
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g = (byte)Math.Round(v);
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b = (byte)Math.Round(p);
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break;
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case 2:
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r = (byte)Math.Round(p);
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g = (byte)Math.Round(v);
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b = (byte)Math.Round(t);
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break;
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case 3:
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r = (byte)Math.Round(p);
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g = (byte)Math.Round(q);
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b = (byte)Math.Round(v);
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break;
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case 4:
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r = (byte)Math.Round(t);
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g = (byte)Math.Round(p);
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b = (byte)Math.Round(v);
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break;
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default: // case 5:
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r = (byte)Math.Round(v);
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g = (byte)Math.Round(p);
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b = (byte)Math.Round(q);
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break;
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}
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}
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}
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}
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