Initial Commit

ViewportRestrictions/MaximalSizeRestriction.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 restriction, which limits the maximal size of <see cref="Viewport"/>'s Visible property.
+	/// </summary>
+	public class MaximalSizeRestriction : ViewportRestriction
+	{
+		/// <summary>
+		/// Initializes a new instance of the <see cref="MaximalSizeRestriction"/> class.
+		/// </summary>
+		public MaximalSizeRestriction() { }
+
+		/// <summary>
+		/// Initializes a new instance of the <see cref="MaximalSizeRestriction"/> class with the given maximal size of Viewport's Visible.
+		/// </summary>
+		/// <param name="maxSize">Maximal size of Viewport's Visible.</param>
+		public MaximalSizeRestriction(double maxSize)
+		{
+			MaxSize = maxSize;
+		}
+
+		private double maxSize = 1000;
+		/// <summary>
+		/// Gets or sets the maximal size of Viewport's Visible.
+		/// The default value is 1000.0.
+		/// </summary>
+		/// <value>The size of the max.</value>
+		public double MaxSize
+		{
+			get { return maxSize; }
+			set
+			{
+				if (maxSize != value)
+				{
+					maxSize = value;
+					RaiseChanged();
+				}
+			}
+		}
+
+		/// <summary>
+		/// Applies the specified old data rect.
+		/// </summary>
+		/// <param name="oldDataRect">The old data rect.</param>
+		/// <param name="newDataRect">The new data rect.</param>
+		/// <param name="viewport">The viewport.</param>
+		/// <returns></returns>
+		public override DataRect Apply(DataRect oldDataRect, DataRect newDataRect, Viewport2D viewport)
+		{
+			bool decreasing = newDataRect.Width < oldDataRect.Width || newDataRect.Height < oldDataRect.Height;
+			if (!decreasing && (newDataRect.Width > maxSize || newDataRect.Height > maxSize))
+				return oldDataRect;
+
+			return newDataRect;
+		}
+	}
+}