using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;



namespace Microsoft.Research.DynamicDataDisplay.Charts

{

	internal sealed class TimeSpanToDoubleConversion

	{

		public TimeSpanToDoubleConversion(TimeSpan minSpan, TimeSpan maxSpan)

			: this(0, minSpan, 1, maxSpan)

		{ }



		public TimeSpanToDoubleConversion(double min, TimeSpan minSpan, double max, TimeSpan maxSpan)

		{

			this.min = min;

			this.length = max - min;

			this.ticksMin = minSpan.Ticks;

			this.ticksLength = maxSpan.Ticks - ticksMin;

		}



		private double min;

		private double length;

		private long ticksMin;

		private long ticksLength;



		internal TimeSpan FromDouble(double d)

		{

			double ratio = (d - min) / length;

			long ticks = (long)(ticksMin + ticksLength * ratio);



			ticks = MathHelper.Clamp(ticks, TimeSpan.MinValue.Ticks, TimeSpan.MaxValue.Ticks);



			return new TimeSpan(ticks);

		}



		internal double ToDouble(TimeSpan span)

		{

			double ratio = (span.Ticks - ticksMin) / (double)ticksLength;

			return min + ratio * length;

		}

	}



}