annotations/Azaion.Dataset/Controls/ClassDistrtibutionProportionWidthConverter.cs

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

namespace Azaion.Dataset.Controls
{
    public class ProportionToWidthConverter : IMultiValueConverter
    {
        private const double MinPixelBarWidth = 2.0;

        public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
        {
            if (values == null || values.Length < 2 ||
                !(values[0] is double proportion) ||
                !(values[1] is double containerActualWidth))
                return MinPixelBarWidth; // Default or fallback width

            if (containerActualWidth <= 0 || !double.IsFinite(containerActualWidth) || double.IsNaN(containerActualWidth))
                return MinPixelBarWidth; // Container not ready or invalid

            double calculatedWidth = proportion * containerActualWidth;

            if (proportion >= 0 && calculatedWidth < MinPixelBarWidth)
                return MinPixelBarWidth;

            return Math.Max(0, calculatedWidth); // Ensure width is not negative
        }

        public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture) =>
            [value];
    }
}