LedPositionConverter.cs

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using System;
using System.Globalization;
using System.Windows.Data;
using Dreamine.UI.Wpf.Controls;
 
namespace Dreamine.UI.Wpf.Converters
{
    public sealed class LedPositionConverter : IMultiValueConverter
    {
        public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
        {
            string mode = (parameter as string) ?? "OuterLeft";
            if (values == null || values.Length < 4) return 0.0;
 
            var corner = values[0] is LedCorner c ? c : LedCorner.TopRight;
            double extent = ToDouble(values[1]); // width or height
            double diameter = ToDouble(values[2]);
            double edgeOffset = ToDouble(values[3]);
            double innerScale = (values.Length > 4) ? ToDouble(values[4]) : 0.45;
 
            double outerLeft = (corner == LedCorner.TopRight || corner == LedCorner.BottomRight)
                ? extent - diameter - edgeOffset
                : edgeOffset;
 
            double outerTop = (corner == LedCorner.BottomLeft || corner == LedCorner.BottomRight)
                ? extent - diameter - edgeOffset
                : edgeOffset;
 
            if (mode.Equals("OuterLeft", StringComparison.OrdinalIgnoreCase)) return outerLeft;
            if (mode.Equals("OuterTop", StringComparison.OrdinalIgnoreCase)) return outerTop;
 
            double innerDiameter = diameter * Clamp01(innerScale);
            double offset = (diameter - innerDiameter) / 2.0;
 
            if (mode.Equals("InnerLeft", StringComparison.OrdinalIgnoreCase)) return outerLeft + offset;
            if (mode.Equals("InnerTop", StringComparison.OrdinalIgnoreCase)) return outerTop + offset;
 
            return 0.0;
        }

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

        private static double ToDouble(object v)
        {
            if (v is double d) return d;
            if (v is float f) return f;
            if (v is int i) return i;
            if (v is string s && double.TryParse(s, out var r)) return r;
            return 0.0;
        }

        private static double Clamp01(double v) => (v < 0) ? 0 : (v > 1 ? 1 : v);
    }
}