Initial Commit

Charts/Axes/Numeric/NumericLabelProviderBase.cs

@@ -0,0 +1,54 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Windows;
+using Microsoft.Research.DynamicDataDisplay.Charts.Axes;
+
+namespace Microsoft.Research.DynamicDataDisplay.Charts
+{
+	public abstract class NumericLabelProviderBase : LabelProviderBase<double>
+	{
+		bool shouldRound = true;
+		private int rounding;
+		protected void Init(double[] ticks)
+		{
+			if (ticks.Length == 0)
+				return;
+
+			double start = ticks[0];
+			double finish = ticks[ticks.Length - 1];
+
+			if (start == finish)
+			{
+				shouldRound = false;
+				return;
+			}
+
+			double delta = finish - start;
+
+			rounding = (int)Math.Round(Math.Log10(delta));
+
+			double newStart = RoundingHelper.Round(start, rounding);
+			double newFinish = RoundingHelper.Round(finish, rounding);
+			if (newStart == newFinish)
+				rounding--;
+		}
+
+		protected override string GetStringCore(LabelTickInfo<double> tickInfo)
+		{
+			string res;
+			if (!shouldRound)
+			{
+				res = tickInfo.Tick.ToString();
+			}
+			else
+			{
+				int round = Math.Min(15, Math.Max(-15, rounding - 3)); // was rounding - 2
+				res = RoundingHelper.Round(tickInfo.Tick, round).ToString();
+			}
+
+			return res;
+		}
+	}
+}