27 lines
879 B
C#
27 lines
879 B
C#
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.Media;
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namespace Ink_Canvas.Helpers
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{
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public class ColorUtilities {
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/// <summary>
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/// 获取一个颜色的人眼感知亮度，并以 0~1 之间的小数表示。
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/// </summary>
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public static double GetGrayLevel(Color color) {
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return (0.299 * color.R + 0.587 * color.G + 0.114 * color.B) / 255;
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}
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/// <summary>
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/// 根据人眼感知亮度返回前景色到底是黑色还是白色
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/// </summary>
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/// <param name="grayLevel"><c>GetGrayLevel</c>返回的人眼感知亮度</param>
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/// <returns>Color</returns>
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public static Color GetReverseForegroundColor(double grayLevel) => grayLevel > 0.5 ? Colors.Black : Colors.White;
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}
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}
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