Initial Commit

Converters/BackgroundToForegroundConverter.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.Media;
+
+namespace Microsoft.Research.DynamicDataDisplay.Converters
+{
+	public class BackgroundToForegroundConverter : GenericValueConverter<SolidColorBrush>
+	{
+		public override object ConvertCore(SolidColorBrush value, Type targetType, object parameter, CultureInfo culture)
+		{
+			SolidColorBrush back = value;
+			Color diff = back.Color - Colors.Black;
+			int summ = diff.R + diff.G + diff.B;
+
+			int border = 3 * 255 / 2;
+
+			return summ > border ? Brushes.Black : Brushes.White;
+		}
+	}
+}