调整代码

Melskin/Converters/Internal/ProgressToAngleConverter.cs

@@ -0,0 +1,62 @@
+using System.Globalization;
+using System.Windows.Data;
+
+namespace Melskin.Converters.Internal
+{
+    internal class ProgressToAngleConverter : IMultiValueConverter
+    {
+        public readonly static ProgressToAngleConverter Instance = new ProgressToAngleConverter();
+
+        public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
+        {
+            // 防御性检查：检查 UnsetValue 或 Null
+            if (values == null || values.Length < 2 ||
+                values[0] == System.Windows.DependencyProperty.UnsetValue || values[0] == null ||
+                values[1] == System.Windows.DependencyProperty.UnsetValue || values[1] == null)
+            {
+                return System.Windows.Media.Geometry.Empty;
+            }
+
+            double value = System.Convert.ToDouble(values[0]);
+            double max = System.Convert.ToDouble(values[1]);
+
+            if (max <= 0) return System.Windows.Media.Geometry.Empty;
+
+            // 确保百分比在 0-0.9999 之间
+            double percent = (value / max) <= 0 ? 0 : (value / max) >= 1 ? 0.9999 : value / max;
+            double angle = percent * 360;
+
+            double size = 100;
+            double stroke = 10;
+            double center = size / 2;
+            double radius = (size - stroke) / 2; // 半径 45
+
+            double rad = (angle - 90) * Math.PI / 180;
+            double x = center + radius * Math.Cos(rad);
+            double y = center + radius * Math.Sin(rad);
+
+            bool isLargeArc = angle > 180;
+
+            Point startPoint = new Point(center, center - radius);
+            Point endPoint = new Point(x, y);
+
+            PathFigure figure = new PathFigure { StartPoint = startPoint, IsClosed = false };
+            figure.Segments.Add(new ArcSegment(
+                endPoint,
+                new Size(radius, radius),
+                0,
+                isLargeArc,
+                SweepDirection.Clockwise,
+                true));
+
+            return new PathGeometry(new[] { figure });
+        }
+
+
+
+        public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}