Initial Commit

ViewportRestrictions/DomainRestriction.cs

@@ -0,0 +1,80 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Windows;
+using Microsoft.Research.DynamicDataDisplay.Common;
+
+namespace Microsoft.Research.DynamicDataDisplay.ViewportRestrictions
+{
+	/// <summary>
+	/// Represents a restriction which returns data rectangle, intersected with specified data domain.
+	/// </summary>
+	public class DomainRestriction : ViewportRestriction
+	{
+		/// <summary>
+		/// Initializes a new instance of the <see cref="DomainRestriction"/> class.
+		/// </summary>
+		public DomainRestriction() { }
+
+		/// <summary>
+		/// Initializes a new instance of the <see cref="DomainRestriction"/> class with given domain property.
+		/// </summary>
+		/// <param name="domain">The domain.</param>
+		public DomainRestriction(DataRect domain)
+		{
+			this.Domain = domain;
+		}
+
+		private DataRect domain = new DataRect(-1, -1, 2, 2);
+		/// <summary>
+		/// Gets or sets the domain.
+		/// </summary>
+		/// <value>The domain.</value>
+		public DataRect Domain
+		{
+			get { return domain; }
+			set
+			{
+				if (domain != value)
+				{
+					domain = 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)
+		{
+			DataRect res = domain;
+			if (domain.IsEmpty)
+			{
+				res = newDataRect;
+			}
+			else if (newDataRect.IntersectsWith(domain))
+			{
+				res = newDataRect;
+				if (newDataRect.Size == oldDataRect.Size)
+				{
+					if (res.XMin < domain.XMin) res.XMin = domain.XMin;
+					if (res.YMin < domain.YMin) res.YMin = domain.YMin;
+					if (res.XMax > domain.XMax) res.XMin += domain.XMax - res.XMax;
+					if (res.YMax > domain.YMax) res.YMin += domain.YMax - res.YMax;
+				}
+				else
+				{
+					res = DataRect.Intersect(newDataRect, domain);
+				}
+			}
+
+			return res;
+		}
+	}
+}