Initial Commit

ViewportRestrictions/MinimalSizeRestriction.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Windows;
+
+namespace Microsoft.Research.DynamicDataDisplay.ViewportRestrictions
+{
+	/// <summary>
+	/// Represents a ViewportRestriction, which the minimal size of <see cref="Viewport"/>'s Visible.
+	/// </summary>
+	public class MinimalSizeRestriction : ViewportRestriction
+	{
+		private double minSize = 1E-11;
+
+		/// <summary>
+		/// Gets or sets the minimal size of Viewport's Visible.
+		/// </summary>
+		/// <value>The minimal size of Viewport's Visible.</value>
+		public double MinSize
+		{
+			get { return minSize; }
+			set
+			{
+				if (minSize != value)
+				{
+					minSize = value;
+					RaiseChanged();
+				}
+			}
+		}
+
+		/// <summary>
+		/// Applies the restriction.
+		/// </summary>
+		/// <param name="previousDataRect">Previous data rectangle.</param>
+		/// <param name="proposedDataRect">Proposed data rectangle.</param>
+		/// <param name="viewport">The viewport, to which current restriction is being applied.</param>
+		/// <returns>New changed visible rectangle.</returns>
+		public override DataRect Apply(DataRect previousDataRect, DataRect proposedDataRect, Viewport2D viewport)
+		{
+			if (proposedDataRect.Width < minSize || proposedDataRect.Height < minSize)
+				return previousDataRect;
+
+			return proposedDataRect;
+		}
+	}
+}