Initial Commit

ViewportRestrictions/ScaleInjectionRestriction.cs

@@ -0,0 +1,57 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace Microsoft.Research.DynamicDataDisplay.ViewportRestrictions
+{
+	public class ScaleInjectionRestriction : ViewportRestriction
+	{
+		private Viewport2D parentViewport;
+		public ScaleInjectionRestriction(Viewport2D parentViewport)
+		{
+			if (parentViewport == null)
+				throw new ArgumentNullException("parentViewport");
+
+			this.parentViewport = parentViewport;
+			parentViewport.PropertyChanged += parentViewport_PropertyChanged;
+		}
+
+		private void parentViewport_PropertyChanged(object sender, ExtendedPropertyChangedEventArgs e)
+		{
+			if (e.PropertyName == "Visible")
+			{
+				RaiseChanged();
+			}
+		}
+
+		public void SetHorizontalTransform(double parentMin, double childMin, double parentMax, double childMax)
+		{
+			xScale = (childMax - childMin) / (parentMax - parentMin);
+			xShift = childMin - parentMin;
+		}
+
+		public void SetVerticalTransform(double parentMin, double childMin, double parentMax, double childMax)
+		{
+			yScale = (childMax - childMin) / (parentMax - parentMin);
+			yShift = childMin - parentMin;
+		}
+
+		private double xShift = 0;
+		private double xScale = 1;
+		private double yShift = 0;
+		private double yScale = 1;
+
+		public override DataRect Apply(DataRect previousDataRect, DataRect proposedDataRect, Viewport2D viewport)
+		{
+			DataRect parentVisible = parentViewport.Visible;
+
+			double xmin = parentVisible.XMin * xScale + xShift;
+			double xmax = parentVisible.XMax * xScale + xShift;
+			double ymin = parentVisible.YMin * yScale + yShift;
+			double ymax = parentVisible.YMax * yScale + yShift;
+
+			return DataRect.Create(xmin, ymin, xmax, ymax);
+		}
+	}
+}