Initial Commit

Transforms/Log10Transform.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Windows;
+
+namespace Microsoft.Research.DynamicDataDisplay
+{
+	/// <summary>
+	/// Represents a logarithmic transform of both x- and y-values.
+	/// </summary>
+	public sealed class Log10Transform : DataTransform
+	{
+		/// <summary>
+		/// Initializes a new instance of the <see cref="Log10Transform"/> class.
+		/// </summary>
+		public Log10Transform() { }
+
+		/// <summary>
+		/// Transforms the point in data coordinates to viewport coordinates.
+		/// </summary>
+		/// <param name="pt">The point in data coordinates.</param>
+		/// <returns>
+		/// Transformed point in viewport coordinates.
+		/// </returns>
+		public override Point DataToViewport(Point pt)
+		{
+			double x = pt.X;
+			double y = pt.Y;
+
+			x = x < 0 ? Double.MinValue : Math.Log10(x);
+			y = y < 0 ? Double.MinValue : Math.Log10(y);
+
+			return new Point(x, y);
+		}
+
+		/// <summary>
+		/// Transforms the point in viewport coordinates to data coordinates.
+		/// </summary>
+		/// <param name="pt">The point in viewport coordinates.</param>
+		/// <returns>Transformed point in data coordinates.</returns>
+		public override Point ViewportToData(Point pt)
+		{
+			return new Point(Math.Pow(10, pt.X), Math.Pow(10, pt.Y));
+		}
+
+		/// <summary>
+		/// Gets the data domain of this dataTransform.
+		/// </summary>
+		/// <value>The data domain of this dataTransform.</value>
+		public override DataRect DataDomain
+		{
+			get { return DataDomains.XYPositive; }
+		}
+	}
+}