source: branches/HeuristicLab.Problems.GrammaticalOptimization/DynamicDataDisplay/Converters/BackgroundToForegroundConverter.cs @ 13834

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;
    }
  }
}