如何使基于WPF中值特定的颜色变亮或变暗？ [英] How to make specific color darken or lighten based on value in wpf?

问题描述

我开发WPF应用程序。我有颜色对象在C＃中的实例。假设我有红色的对象实例即颜色C = Color.FromArgb（255,255,0,0）现在假设我有一个值范围为1〜10。因此在此基础上的价值我想改变'C'对象的颜色。我要为1淡红色，暗红色10.淡红色变成暗从1值增大我怎样才能做到这一点在C＃中的WPF应用程序？能否请您给我提供任何代码或链接，通过它我可以解决上述问题？

I am developing wpf application. I am having the instance of Color object in C#. Suppose I have instance of red Color object i.e. Color c = Color.FromArgb(255,255,0,0) Now suppose that I have one value which ranges from 1 to 10. So based on this value I want to change the color of the 'c' object. I want light red for 1 and dark red for 10. The light red becomes the dark as the value increases from 1. How can I do this in C# for wpf application ? Can you please provide me any code or link through which I can resolve the above issue ?

推荐答案

您可以尝试简单地乘以红，绿色和蓝色成分被一些系数。

You can try to simply multiply red, green and blue components by some coefficient.

public static Color ChangeLightness(this Color color, float coef)
{
    return Color.FromArgb((int)(color.R * coef), (int)(color.G * coef),
        (int)(color.B * coef));
}

或者，如果你想使用整数1值10代替系数：

Or, if you'd like to use an integer value from 1 to 10 instead of the coefficient:

private const int MinLightness = 1;
private const int MaxLightness = 10;
private const float MinLightnessCoef = 1f;
private const float MaxLightnessCoef = 0.4f;

public static Color ChangeLightness(this Color color, int lightness)
{
    if (lightness < MinLightness)
        lightness = MinLightness;
    else if (lightness > MaxLightness)
        lightness = MaxLightness;

    float coef = MinLightnessCoef +
      (
        (lightness - MinLightness) *
          ((MaxLightnessCoef - MinLightnessCoef) / (MaxLightness - MinLightness))
      );

    return Color.FromArgb((int)(color.R * coef), (int)(color.G * coef),
        (int)(color.B * coef));
}

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