source: branches/HeuristicLab.Problems.GrammaticalOptimization/DynamicDataDisplay/Charts/Axes/DateTime/DateTimeToDoubleConversion.cs @ 12503

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

namespace Microsoft.Research.DynamicDataDisplay.Charts
{
  internal sealed class DateTimeToDoubleConversion
  {
    public DateTimeToDoubleConversion(double min, DateTime minDate, double max, DateTime maxDate)
    {
      this.min = min;
      this.length = max - min;
      this.ticksMin = minDate.Ticks;
      this.ticksLength = maxDate.Ticks - ticksMin;
    }

    private double min;
    private double length;
    private long ticksMin;
    private long ticksLength;

    internal DateTime FromDouble(double d)
    {
      double ratio = (d - min) / length;
      long tick = (long)(ticksMin + ticksLength * ratio);

      tick = MathHelper.Clamp(tick, DateTime.MinValue.Ticks, DateTime.MaxValue.Ticks);

      return new DateTime(tick);
    }

    internal double ToDouble(DateTime dt)
    {
      double ratio = (dt.Ticks - ticksMin) / (double)ticksLength;
      return min + ratio * length;
    }
  }
}