如何根据wpf中的值使特定颜色变暗或变亮？

Question

我正在开发wpf应用程序.我在C#中拥有Color对象的实例.假设我有一个红色Color对象的实例,即Color c = Color.FromArgb(255,255,0,0)现在假设我有一个值,范围从1到10.所以根据这个值,我想改变'c'对象的颜色.我希望浅红色为1,暗红色为10.浅红色变为暗,因为值从1增加.如何在C#中为wpf应用程序执行此操作？能否请您提供我可以解决上述问题的任何代码或链接？

Answer 1

您可以尝试简单地将红色,绿色和蓝色分量乘以某个系数.

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,如果您想使用1到10之间的整数值而不是系数:

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(color.A, (int)(color.R * coef), (int)(color.G * coef),
        (int)(color.B * coef));
}

Answer 2

如果您有一定数量的值，那么 Style DataTrigger 怎么样？

https://www.google.co.uk/search?q=c%23+wpf+style+datatrigger

<Button>
    <Button.Style>
        <Style TargetType="{x:Type Button}">
            <Style.Triggers>
                <DataTrigger Binding="{Binding NameOfYourProperty}" Value="0">
                    <Setter Property="Background"
                            Value="#FF000000" />
                </DataTrigger>
                <DataTrigger Binding="{Binding NameOfYourProperty}" Value="1">
                    <Setter Property="Background"
                            Value="#FF110000" />
                </DataTrigger>
                <DataTrigger Binding="{Binding NameOfYourProperty}" Value="2">
                    <Setter Property="Background"
                            Value="#FF220000" />
                </DataTrigger>
                ( etc ... )
            </Style.Triggers>
        </Style>
    </Button.Style>
</Button>

然后，如果您需要重用该样式，那么您可以放入<Resources>窗口/用户控件的部分。