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