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Backup/ScaleConverter.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using Microsoft.Research.DynamicDataDisplay.Converters;
+using System.Globalization;
+
+namespace Microsoft.Research.DynamicDataDisplay
+{
+	public sealed class ScaleConverter : GenericValueConverter<DataRect>
+	{
+		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 object ConvertCore(DataRect value, Type targetType, object parameter, CultureInfo culture)
+		{
+			DataRect parentVisible = value;
+
+			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);
+		}
+
+		public override object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+		{
+			if (targetType == typeof(DataRect))
+			{
+				DataRect childVisible = (DataRect)value;
+				double xmin = (childVisible.XMin - xShift) / xScale;
+				double xmax = (childVisible.XMax - xShift) / xScale;
+				double ymin = (childVisible.YMin - yShift) / yScale;
+				double ymax = (childVisible.YMax - yShift) / yScale;
+
+				return DataRect.Create(xmin, ymin, xmax, ymax);
+			}
+			return base.ConvertBack(value, targetType, parameter, culture);
+		}
+	}
+}