ShrlAlgoToolkit/Melskin/Converters/Internal/IntensityToEmbossMarginRightBottomConverter.cs

using System.Globalization;
using System.Windows.Data;

namespace Melskin.Converters.Internal;

/// <summary>
/// IntensityToEmbossMarginRightBottomConverter 转换器用于将浮点数强度值转换为 Thickness 结构，以应用于右下边距。
/// 该转换器主要用于创建浮雕效果的控件中，通过调整边距来模拟不同强度下的视觉效果。
/// 当输入的强度值为1时，产生的边距最小，从而使得着色边框更加明显。随着强度值减小，边距增大，
/// 使着色部分看起来更模糊或更不显著。
/// </summary>
[ValueConversion(typeof(double), typeof(Thickness))]
internal sealed class IntensityToEmbossMarginRightBottomConverter : IValueConverter
{
    public static readonly IntensityToEmbossMarginRightBottomConverter Instance = new();

    public object Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
    {
        var intensity = (double)(value ?? 0.5);
        //数值为1的时候边距最小，露出的着色边框越大
        var marginValue = 4 * intensity;
        return new Thickness(marginValue, marginValue, -marginValue, -marginValue);
    }

    public object ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
    {
        return Binding.DoNothing;
    }
}