Initial Commit

Charts/Axes/DateTime/DateTimeToDoubleConversion.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 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;
+		}
+	}
+}