init

Backup/PointMarkers/CenteredTextMarker.cs

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+using System.Threading;
+using System.Windows;
+using System.Windows.Media;
+
+namespace Microsoft.Research.DynamicDataDisplay.PointMarkers
+{
+	/// <summary>Renders specified text near the point</summary>
+	public class CenteredTextMarker : PointMarker
+	{
+		public string Text
+		{
+			get { return (string)GetValue(TextProperty); }
+			set { SetValue(TextProperty, value); }
+		}
+
+		public static readonly DependencyProperty TextProperty =
+			DependencyProperty.Register(
+			  "Text",
+			  typeof(string),
+			  typeof(CenteredTextMarker),
+			  new FrameworkPropertyMetadata(""));
+
+		public override void Render(DrawingContext dc, Point screenPoint)
+		{
+			FormattedText textToDraw = new FormattedText(Text, Thread.CurrentThread.CurrentCulture,
+				 FlowDirection.LeftToRight, new Typeface("Arial"), 12, Brushes.Black);
+
+			double width = textToDraw.Width;
+			double height = textToDraw.Height;
+
+			const double verticalShift = -20; // px
+
+			Rect bounds = RectExtensions.FromCenterSize(new Point(screenPoint.X, screenPoint.Y + verticalShift - height / 2),
+				new Size(width, height));
+
+			Point loc = bounds.Location;
+			bounds = CoordinateUtilities.RectZoom(bounds, 1.05, 1.15);
+
+			dc.DrawLine(new Pen(Brushes.Black, 1), Point.Add(screenPoint, new Vector(0, verticalShift)), screenPoint);
+			dc.DrawRectangle(Brushes.White, new Pen(Brushes.Black, 1), bounds);
+			dc.DrawText(textToDraw, loc);
+		}
+	}
+}