124 lines
4.1 KiB
C#
124 lines
4.1 KiB
C#
using System;
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using System.Linq;
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using WPFluent.Controls;
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namespace WPFluent.Extensions
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{
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public static class HsbExtensions
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{
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private static bool IsCloseTo(this double value, double target, double tolerance = double.Epsilon) => Math.Abs(
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value - target) <
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tolerance;
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/// <summary>
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/// 将 HSB（色相、饱和度、亮度）颜色空间转换为 Color 对象。
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/// </summary>
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/// <param name="hsb"></param>
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/// <returns></returns>
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/// <exception cref="InvalidOperationException"></exception>
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public static Color ToColor(this Controls.Hsb hsb)
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{
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//0~1
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var hue = hsb.Hue;
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var saturation = hsb.Saturation;
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var brightness = hsb.Brightness;
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var opacity = hsb.Opacity;
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brightness *= 255;
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//饱和度为0，直接返回亮度值
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if (saturation.IsCloseTo(0))
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return Color.FromArgb((byte)brightness, (byte)brightness, (byte)brightness, (byte)brightness);
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opacity *= 255;
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//处理色相超出范围
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if (hue.IsCloseTo(360))
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hue = 0;
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while (hue > 360)
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hue -= 360;
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while (hue < 0)
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hue += 360;
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//通过色相返回颜色
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hue /= 60;
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//以60作为一个区间，通过switch判断
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var i = (int)Math.Floor(hue);
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//计算出色相值在当前区间内的偏移量
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var f = hue - i;
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//计算出低饱和度情况下的亮度值
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var p = brightness * (1 - saturation);
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//计算出中间饱和度情况下的亮度值
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var q = brightness * (1 - saturation * f);
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//计算出高饱和度情况下的亮度值
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var t = brightness * (1 - saturation * (1 - f));
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return i switch
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{
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//[0~60)红色区间
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0 => Color.FromArgb((byte)opacity, (byte)brightness, (byte)t, (byte)p),
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//[60~120)黄色区间
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1 => Color.FromArgb((byte)opacity, (byte)q, (byte)brightness, (byte)p),
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//[120~180)绿色区间
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2 => Color.FromArgb((byte)opacity, (byte)p, (byte)brightness, (byte)t),
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//[180~240)青色区间
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3 => Color.FromArgb((byte)opacity, (byte)p, (byte)q, (byte)brightness),
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//[240~300)蓝色区间
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4 => Color.FromArgb((byte)opacity, (byte)t, (byte)p, (byte)brightness),
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//[300~360)洋红色区间
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5 => Color.FromArgb((byte)opacity, (byte)brightness, (byte)p, (byte)q),
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_ => throw new InvalidOperationException("不可用的HSB值"),
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};
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}
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/// <summary>
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/// 将 Color 对象转换为 HSB（色相、饱和度、亮度）颜色空间。
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/// </summary>
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/// <param name="color"></param>
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/// <returns></returns>
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public static Controls.Hsb ToHsb(this Color color)
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{
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double r = color.R;
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double g = color.G;
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double b = color.B;
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double a = color.A;
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r /= 255;
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g /= 255;
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b /= 255;
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a /= 255;
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var rgb = new[] { r, g, b };
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var max = rgb.Max();
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var min = rgb.Min();
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var brightness = max;
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var hue = max;
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var delta = max - min;
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var saturation = max.IsCloseTo(0) ? 0 : delta / max;
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if (max.IsCloseTo(min))
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{
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hue = 0; // 无色，未定义
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}
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else
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{
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if (max.IsCloseTo(r))
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{
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hue = (g - b) / delta + (g < b ? 6 : 0);
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}
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else if (max.IsCloseTo(g))
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{
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hue = (b - r) / delta + 2;
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}
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else if (max.IsCloseTo(b))
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{
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hue = (r - g) / delta + 4;
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}
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hue *= 60;
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}
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return new Hsb(hue, saturation, brightness, a);
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}
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}
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}
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