Initial Commit

Charts/Shapes/Arrow.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Windows.Media;
+using System.Windows;
+using Microsoft.Research.DynamicDataDisplay;
+
+namespace Microsoft.Research.DynamicDataDisplay.Charts.Shapes
+{
+	/// <summary>
+	/// Paints an arrow with start and end points in viewport coordinates.
+	/// </summary>
+	public class Arrow : Segment
+	{
+		/// <summary>
+		/// Initializes a new instance of the <see cref="Arrow"/> class.
+		/// </summary>
+		public Arrow()
+		{
+			Init();
+		}
+
+		/// <summary>
+		/// Initializes a new instance of the <see cref="Arrow"/> class.
+		/// </summary>
+		/// <param name="startPoint">The start point of arrow.</param>
+		/// <param name="endPoint">The end pointof arrow .</param>
+		public Arrow(Point startPoint, Point endPoint)
+			: base(startPoint, endPoint)
+		{
+			Init();
+		}
+
+		private void Init()
+		{
+			geometryGroup.Children.Add(LineGeometry);
+			geometryGroup.Children.Add(leftLineGeometry);
+			geometryGroup.Children.Add(rightLineGeometry);
+		}
+
+		#region ArrowLength property
+
+		/// <summary>
+		/// Gets or sets the length of the arrow.
+		/// </summary>
+		/// <value>The length of the arrow.</value>
+		public double ArrowLength
+		{
+			get { return (double)GetValue(ArrowLengthProperty); }
+			set { SetValue(ArrowLengthProperty, value); }
+		}
+
+		/// <summary>
+		/// Identifies ArrowLength dependency property.
+		/// </summary>
+		public static readonly DependencyProperty ArrowLengthProperty = DependencyProperty.Register(
+		  "ArrowLength",
+		  typeof(double),
+		  typeof(Arrow),
+		  new FrameworkPropertyMetadata(0.1, OnPointChanged));
+
+		#endregion
+
+		#region ArrowAngle property
+
+		/// <summary>
+		/// Gets or sets the arrow angle in degrees.
+		/// </summary>
+		/// <value>The arrow angle.</value>
+		public double ArrowAngle
+		{
+			get { return (double)GetValue(ArrowAngleProperty); }
+			set { SetValue(ArrowAngleProperty, value); }
+		}
+
+		/// <summary>
+		/// Identifies ArrowAngle dependency property.
+		/// </summary>
+		public static readonly DependencyProperty ArrowAngleProperty = DependencyProperty.Register(
+		  "ArrowAngle",
+		  typeof(double),
+		  typeof(Arrow),
+		  new FrameworkPropertyMetadata(15.0, OnPointChanged));
+
+		#endregion
+
+		protected override void UpdateUIRepresentationCore()
+		{
+			base.UpdateUIRepresentationCore();
+
+			var transform = Plotter.Viewport.Transform;
+
+			Point p1 = StartPoint.DataToScreen(transform);
+			Point p2 = EndPoint.DataToScreen(transform);
+
+			Vector arrowVector = p1 - p2;
+			Vector arrowCapVector = ArrowLength * arrowVector;
+
+			Matrix leftMatrix = Matrix.Identity;
+			leftMatrix.Rotate(ArrowAngle);
+
+			Matrix rightMatrix = Matrix.Identity;
+			rightMatrix.Rotate(-ArrowAngle);
+
+			Vector leftArrowLine = leftMatrix.Transform(arrowCapVector);
+			Vector rightArrowLine = rightMatrix.Transform(arrowCapVector);
+
+			leftLineGeometry.StartPoint = p2;
+			rightLineGeometry.StartPoint = p2;
+
+			leftLineGeometry.EndPoint = p2 + leftArrowLine;
+			rightLineGeometry.EndPoint = p2 + rightArrowLine;
+		}
+
+		private LineGeometry leftLineGeometry = new LineGeometry();
+		private LineGeometry rightLineGeometry = new LineGeometry();
+		private GeometryGroup geometryGroup = new GeometryGroup();
+		protected override Geometry DefiningGeometry
+		{
+			get { return geometryGroup; }
+		}
+	}
+}