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Backup/Charts/Axes/TimeSpan/TimeSpanToDoubleConversion.cs

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+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;
+		}
+	}
+
+}