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