source: branches/HeuristicLab.Problems.GrammaticalOptimization/DynamicDataDisplay/Charts/Axes/DefaultAxisConversions.cs @ 13847

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Microsoft.Research.DynamicDataDisplay.Charts
{
  /// <summary>
  /// Contains default axis value conversions.
  /// </summary>
  public static class DefaultAxisConversions
  {
    #region double

    private static readonly Func<double, double> doubleToDouble = d => d;
    public static Func<double, double> DoubleToDouble
    {
      get { return DefaultAxisConversions.doubleToDouble; }
    }

    private static readonly Func<double, double> doubleFromDouble = d => d;
    public static Func<double, double> DoubleFromDouble
    {
      get { return DefaultAxisConversions.doubleFromDouble; }
    }

    #endregion

    #region DateTime

    private static readonly long minDateTimeTicks = DateTime.MinValue.Ticks;
    private static readonly long maxDateTimeTicks = DateTime.MaxValue.Ticks;
    private static readonly Func<double, System.DateTime> dateTimeFromDouble = d =>
    {
      long ticks = (long)(d * 10000000000L);

      // todo should we throw an exception if number of ticks is too big or small?
      if (ticks < minDateTimeTicks)
        ticks = minDateTimeTicks;
      else if (ticks > maxDateTimeTicks)
        ticks = maxDateTimeTicks;

      return new DateTime(ticks);
    };
    public static Func<double, DateTime> DateTimeFromDouble
    {
      get { return dateTimeFromDouble; }
    }

    private static readonly Func<DateTime, double> dateTimeToDouble = dt => dt.Ticks / 10000000000.0;
    public static Func<DateTime, double> DateTimeToDouble
    {
      get { return DefaultAxisConversions.dateTimeToDouble; }
    }

    #endregion

    #region TimeSpan

    private static readonly long minTimeSpanTicks = TimeSpan.MinValue.Ticks;
    private static readonly long maxTimeSpanTicks = TimeSpan.MaxValue.Ticks;

    private static readonly Func<double, TimeSpan> timeSpanFromDouble = d =>
    {
      long ticks = (long)(d * 10000000000L);

      // todo should we throw an exception if number of ticks is too big or small?
      if (ticks < minTimeSpanTicks)
        ticks = minTimeSpanTicks;
      else if (ticks > maxTimeSpanTicks)
        ticks = maxTimeSpanTicks;

      return new TimeSpan(ticks);
    };

    public static Func<double, TimeSpan> TimeSpanFromDouble
    {
      get { return DefaultAxisConversions.timeSpanFromDouble; }
    }

    private static readonly Func<TimeSpan, double> timeSpanToDouble = timeSpan =>
    {
      return timeSpan.Ticks / 10000000000.0;
    };

    public static Func<TimeSpan, double> TimeSpanToDouble
    {
      get { return DefaultAxisConversions.timeSpanToDouble; }
    }

    #endregion

    #region integer

    private readonly static Func<double, int> intFromDouble = d => (int)d;
    public static Func<double, int> IntFromDouble
    {
      get { return DefaultAxisConversions.intFromDouble; }
    }

    private readonly static Func<int, double> intToDouble = i => (double)i;
    public static Func<int, double> IntToDouble
    {
      get { return DefaultAxisConversions.intToDouble; }
    } 

    #endregion
  }
}