Initial Commit

Charts/MagnifyingGlass.xaml.cs

@@ -0,0 +1,137 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Navigation;
+using System.Windows.Shapes;
+
+namespace Microsoft.Research.DynamicDataDisplay
+{
+	public partial class MagnifyingGlass : Grid, IPlotterElement
+	{
+		public MagnifyingGlass()
+		{
+			InitializeComponent();
+			Loaded += MagnifyingGlass_Loaded;
+
+			whiteEllipse.Visibility = Visibility.Collapsed;
+			magnifierEllipse.Visibility = Visibility.Collapsed;
+		}
+
+		private void MagnifyingGlass_Loaded(object sender, RoutedEventArgs e)
+		{
+			UpdateViewbox();
+		}
+
+		protected override void OnPreviewMouseWheel(MouseWheelEventArgs e)
+		{
+			Magnification += e.Delta / Mouse.MouseWheelDeltaForOneLine * 0.2;
+			e.Handled = false;
+		}
+
+		private void plotter_PreviewMouseMove(object sender, MouseEventArgs e)
+		{
+			VisualBrush b = (VisualBrush)magnifierEllipse.Fill;
+			Point pos = e.GetPosition(plotter.ParallelCanvas);
+
+			Point plotterPos = e.GetPosition(plotter);
+
+			Rect viewBox = b.Viewbox;
+			double xoffset = viewBox.Width / 2.0;
+			double yoffset = viewBox.Height / 2.0;
+			viewBox.X = plotterPos.X - xoffset;
+			viewBox.Y = plotterPos.Y - yoffset;
+			b.Viewbox = viewBox;
+			Canvas.SetLeft(this, pos.X - Width / 2);
+			Canvas.SetTop(this, pos.Y - Height / 2);
+		}
+
+		private double magnification = 2.0;
+		public double Magnification
+		{
+			get { return magnification; }
+			set
+			{
+				magnification = value;
+
+				UpdateViewbox();
+			}
+		}
+
+		private void UpdateViewbox()
+		{
+			if (!IsLoaded)
+				return;
+
+			VisualBrush b = (VisualBrush)magnifierEllipse.Fill;
+			Rect viewBox = b.Viewbox;
+			viewBox.Width = Width / magnification;
+			viewBox.Height = Height / magnification;
+			b.Viewbox = viewBox;
+		}
+
+		protected override void OnPropertyChanged(DependencyPropertyChangedEventArgs e)
+		{
+			base.OnPropertyChanged(e);
+
+			if (e.Property == WidthProperty || e.Property == HeightProperty)
+			{
+				UpdateViewbox();
+			}
+		}
+
+		#region IPlotterElement Members
+
+		Plotter plotter;
+		public void OnPlotterAttached(Plotter plotter)
+		{
+			this.plotter = plotter;
+			plotter.ParallelCanvas.Children.Add(this);
+			plotter.PreviewMouseMove += plotter_PreviewMouseMove;
+			plotter.MouseEnter += new MouseEventHandler(plotter_MouseEnter);
+			plotter.MouseLeave += new MouseEventHandler(plotter_MouseLeave);
+
+			VisualBrush b = (VisualBrush)magnifierEllipse.Fill;
+			b.Visual = plotter.MainGrid;
+		}
+
+		void plotter_MouseLeave(object sender, MouseEventArgs e)
+		{
+			whiteEllipse.Visibility = Visibility.Collapsed;
+			magnifierEllipse.Visibility = Visibility.Collapsed;
+		}
+
+		void plotter_MouseEnter(object sender, MouseEventArgs e)
+		{
+			whiteEllipse.Visibility = Visibility.Visible;
+			magnifierEllipse.Visibility = Visibility.Visible;
+		}
+
+		public void OnPlotterDetaching(Plotter plotter)
+		{
+			plotter.MouseEnter -= new MouseEventHandler(plotter_MouseEnter);
+			plotter.MouseLeave -= new MouseEventHandler(plotter_MouseLeave);
+
+			plotter.PreviewMouseMove -= plotter_PreviewMouseMove;
+			plotter.ParallelCanvas.Children.Remove(this);
+			this.plotter = null;
+
+			VisualBrush b = (VisualBrush)magnifierEllipse.Fill;
+			b.Visual = null;
+		}
+
+		public Plotter Plotter
+		{
+			get { return plotter; ; }
+		}
+
+		#endregion
+	}
+}