Initial Commit

Viewport2DExtensions.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Windows;
+using Microsoft.Research.DynamicDataDisplay.Common.UndoSystem;
+
+namespace Microsoft.Research.DynamicDataDisplay
+{
+	public static class Viewport2DExtensions
+	{
+		public static void Zoom(this Viewport2D viewport, double factor)
+		{
+			DataRect visible = viewport.Visible;
+			DataRect oldVisible = visible;
+			Point center = visible.GetCenter();
+			Vector halfSize = new Vector(visible.Width * factor / 2, visible.Height * factor / 2);
+			viewport.Visible = new DataRect(center - halfSize, center + halfSize);
+
+			viewport.Plotter.UndoProvider.AddAction(new DependencyPropertyChangedUndoAction(viewport, Viewport2D.VisibleProperty, oldVisible, visible));
+		}
+	}
+}