更新

AntdWpf/Converters/ArcEndPointConverter.cs

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+using System;
+using System.Globalization;
+using System.Windows;
+using System.Windows.Data;
+using System.Windows.Markup;
+
+//https://github.com/MaterialDesignInXAML/MaterialDesignInXamlToolkit/blob/master/src/MaterialDesignThemes.Wpf/Converters/CircularProgressBar/ArcEndPointConverter.cs
+
+namespace AntdWpf.Converters
+{
+    public class ArcEndPointConverter : MarkupExtension, IMultiValueConverter
+    {
+        /// <summary>
+        /// CircularProgressBar draws two arcs to support a full circle at 100 %.
+        /// With one arc at 100 % the start point is identical the end point, so nothing is drawn.
+        /// Midpoint at half of current percentage is the endpoint of the first arc
+        /// and the start point of the second arc.
+        /// </summary>
+        public const string ParameterMidPoint = "MidPoint";
+
+        public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
+        {
+            double actualWidth = values[0].ExtractDouble();
+            double value = values[1].ExtractDouble();
+            double minimum = values[2].ExtractDouble();
+            double maximum = values[3].ExtractDouble();
+
+            if (new[] { actualWidth, value, minimum, maximum }.AnyNan())
+                return Binding.DoNothing;
+
+            if (values.Length == 5)
+            {
+                double fullIndeterminateScaling = values[4].ExtractDouble();
+                if (!double.IsNaN(fullIndeterminateScaling) && fullIndeterminateScaling > 0.0)
+                {
+                    value = (maximum - minimum) * fullIndeterminateScaling;
+                }
+            }
+
+            double percent = maximum <= minimum ? 1.0 : (value - minimum) / (maximum - minimum);
+            if (Equals(parameter, ParameterMidPoint))
+                percent /= 2;
+
+            double degrees = 360 * percent;
+            double radians = degrees * (Math.PI / 180);
+
+            var centre = new Point(actualWidth / 2, actualWidth / 2);
+            double hypotenuseRadius = (actualWidth / 2);
+
+            double adjacent = Math.Cos(radians) * hypotenuseRadius;
+            double opposite = Math.Sin(radians) * hypotenuseRadius;
+
+            return new Point(centre.X + opposite, centre.Y - adjacent);
+        }
+
+        public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture) => throw new NotImplementedException();
+
+        public override object ProvideValue(IServiceProvider serviceProvider)
+        {
+            return this;
+        }
+    }
+}