Initial Commit

Charts/Axes/Numeric/ExponentialLabelProvider.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Documents;
+using System.Globalization;
+using System.Diagnostics;
+using Microsoft.Research.DynamicDataDisplay.Charts.Axes;
+
+namespace Microsoft.Research.DynamicDataDisplay.Charts
+{
+	/// <summary>
+	/// Represents an axis label provider for double ticks, generating labels with numbers in exponential form when it is appropriate.
+	/// </summary>
+	public sealed class ExponentialLabelProvider : NumericLabelProviderBase
+	{
+		/// <summary>
+		/// Initializes a new instance of the <see cref="ExponentialLabelProvider"/> class.
+		/// </summary>
+		public ExponentialLabelProvider() { }
+
+		/// <summary>
+		/// Creates labels by given ticks info.
+		/// Is not intended to be called from your code.
+		/// </summary>
+		/// <param name="ticksInfo">The ticks info.</param>
+		/// <returns>
+		/// Array of <see cref="UIElement"/>s, which are axis labels for specified axis ticks.
+		/// </returns>
+		public override UIElement[] CreateLabels(ITicksInfo<double> ticksInfo)
+		{
+			var ticks = ticksInfo.Ticks;
+
+			Init(ticks);
+
+			UIElement[] res = new UIElement[ticks.Length];
+
+			LabelTickInfo<double> tickInfo = new LabelTickInfo<double> { Info = ticksInfo.Info };
+
+			for (int i = 0; i < res.Length; i++)
+			{
+				var tick = ticks[i];
+				tickInfo.Tick = tick;
+				tickInfo.Index = i;
+
+				string labelText = GetString(tickInfo);
+
+				TextBlock label;
+				if (labelText.Contains('E'))
+				{
+					string[] substrs = labelText.Split('E');
+					string mantissa = substrs[0];
+					string exponenta = substrs[1];
+					exponenta = exponenta.TrimStart('+');
+					Span span = new Span();
+					span.Inlines.Add(String.Format(CultureInfo.CurrentCulture, "{0}·10", mantissa));
+					Span exponentaSpan = new Span(new Run(exponenta));
+					exponentaSpan.BaselineAlignment = BaselineAlignment.Superscript;
+					exponentaSpan.FontSize = 8;
+					span.Inlines.Add(exponentaSpan);
+
+					label = new TextBlock(span);
+					LabelProviderProperties.SetExponentialIsCommonLabel(label, false);
+				}
+				else
+				{
+					label = (TextBlock)GetResourceFromPool();
+					if (label == null)
+					{
+						label = new TextBlock();
+					}
+
+					label.Text = labelText;
+				}
+				res[i] = label;
+				label.ToolTip = tick.ToString(CultureInfo.CurrentCulture);
+
+				ApplyCustomView(tickInfo, label);
+			}
+
+			return res;
+		}
+
+		protected override bool ReleaseCore(UIElement label)
+		{
+			bool isNotExponential = LabelProviderProperties.GetExponentialIsCommonLabel(label);
+			return isNotExponential && CustomView == null;
+		}
+	}
+}