Initial Commit

Charts/Markers/BarFromValueConverter.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Windows.Data;
+using System.Globalization;
+using System.Windows;
+using System.Windows.Media;
+
+namespace Microsoft.Research.DynamicDataDisplay.Charts.Markers
+{
+	public class BarFromValueConverter : IValueConverter
+	{
+		/// <summary>
+		/// Initializes a new instance of the <see cref="BarFromValueConverter"/> class.
+		/// </summary>
+		public BarFromValueConverter() { }
+
+		public Brush PositiveBrush { get; set; }
+		public Brush NegativeBrush { get; set; }
+
+		#region IValueConverter Members
+
+		public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+		{
+			if (!(value is double))
+				return DependencyProperty.UnsetValue;
+
+			double height = (double)value;
+
+			if (targetType == typeof(Brush))
+			{
+				if (height > 0)
+					return PositiveBrush;
+				else
+					return NegativeBrush;
+			}
+			else if (targetType == typeof(double))
+			{
+				return Math.Abs(height);
+			}
+			else if (targetType == typeof(VerticalAlignment))
+			{
+				return height > 0 ? VerticalAlignment.Bottom : VerticalAlignment.Top;
+			}
+
+			return DependencyProperty.UnsetValue;
+		}
+
+		public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+		{
+			throw new NotSupportedException();
+		}
+
+		#endregion
+	}
+}