Initial Commit

Charts/Axes/DateTime/Strategies/ExtendedDaysStrategy.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace Microsoft.Research.DynamicDataDisplay.Charts
+{
+	public class ExtendedDaysStrategy : IDateTimeTicksStrategy
+	{
+		private static readonly DifferenceIn[] diffs = new DifferenceIn[] { 
+			DifferenceIn.Year,
+			DifferenceIn.Day,
+			DifferenceIn.Hour,
+			DifferenceIn.Minute,
+			DifferenceIn.Second,
+			DifferenceIn.Millisecond
+		};
+
+		public DifferenceIn GetDifference(TimeSpan span)
+		{
+			span = span.Duration();
+
+			DifferenceIn diff;
+			if (span.Days > 365)
+				diff = DifferenceIn.Year;
+			else if (span.Days > 0)
+				diff = DifferenceIn.Day;
+			else if (span.Hours > 0)
+				diff = DifferenceIn.Hour;
+			else if (span.Minutes > 0)
+				diff = DifferenceIn.Minute;
+			else if (span.Seconds > 0)
+				diff = DifferenceIn.Second;
+			else
+				diff = DifferenceIn.Millisecond;
+
+			return diff;
+		}
+
+		public bool TryGetLowerDiff(DifferenceIn diff, out DifferenceIn lowerDiff)
+		{
+			lowerDiff = diff;
+
+			int index = Array.IndexOf(diffs, diff);
+			if (index == -1)
+				return false;
+
+			if (index == diffs.Length - 1)
+				return false;
+
+			lowerDiff = diffs[index + 1];
+			return true;
+		}
+
+		public bool TryGetBiggerDiff(DifferenceIn diff, out DifferenceIn biggerDiff)
+		{
+			biggerDiff = diff;
+
+			int index = Array.IndexOf(diffs, diff);
+			if (index == -1 || index == 0)
+				return false;
+
+			biggerDiff = diffs[index - 1];
+			return true;
+		}
+	}
+}