Initial Commit

Charts/Axes/RoundingHelper.cs

@@ -0,0 +1,67 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Diagnostics;
+
+namespace Microsoft.Research.DynamicDataDisplay.Charts
+{
+	internal static class RoundingHelper
+	{
+		internal static int GetDifferenceLog(double min, double max)
+		{
+			return (int)Math.Round(Math.Log10(Math.Abs(max - min)));
+		}
+
+		internal static double Round(double number, int rem)
+		{
+			if (rem <= 0)
+			{
+				rem = MathHelper.Clamp(-rem, 0, 15);
+				return Math.Round(number, rem);
+			}
+			else
+			{
+				double pow = Math.Pow(10, rem - 1);
+				double val = pow * Math.Round(number / Math.Pow(10, rem - 1));
+				return val;
+			}
+		}
+
+		internal static double Round(double value, Range<double> range)
+		{
+			int log = GetDifferenceLog(range.Min, range.Max);
+
+			return Round(value, log);
+		}
+
+		internal static RoundingInfo CreateRoundedRange(double min, double max)
+		{
+			double delta = max - min;
+
+			if (delta == 0)
+				return new RoundingInfo { Min = min, Max = max, Log = 0 };
+
+			int log = (int)Math.Round(Math.Log10(Math.Abs(delta))) + 1;
+
+			double newMin = Round(min, log);
+			double newMax = Round(max, log);
+			if (newMin == newMax)
+			{
+				log--;
+				newMin = Round(min, log);
+				newMax = Round(max, log);
+			}
+
+			return new RoundingInfo { Min = newMin, Max = newMax, Log = log };
+		}
+	}
+
+	[DebuggerDisplay("{Min} - {Max}, Log = {Log}")]
+	internal sealed class RoundingInfo
+	{
+		public double Min { get; set; }
+		public double Max { get; set; }
+		public int Log { get; set; }
+	}
+}