Initial Commit

Charts/Shapes/DraggablePoint.xaml.cs

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+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;
+using System.Windows.Controls.Primitives;
+using Microsoft.Research.DynamicDataDisplay;
+
+namespace Microsoft.Research.DynamicDataDisplay.Charts.Shapes
+{
+	/// <summary>
+	/// Represents a simple draggable point with position bound to point in viewport coordinates, which allows to drag iself by mouse.
+	/// </summary>
+	public partial class DraggablePoint : PositionalViewportUIContainer
+	{
+		/// <summary>
+		/// Initializes a new instance of the <see cref="DraggablePoint"/> class.
+		/// </summary>
+		public DraggablePoint()
+		{
+			InitializeComponent();
+		}
+
+		/// <summary>
+		/// Initializes a new instance of the <see cref="DraggablePoint"/> class.
+		/// </summary>
+		/// <param name="position">The position of DraggablePoint.</param>
+		public DraggablePoint(Point position) : this() { Position = position; }
+
+		bool dragging = false;
+		Point dragStart;
+		Vector shift;
+		protected override void OnMouseLeftButtonDown(MouseButtonEventArgs e)
+		{
+			if (Plotter == null)
+				return;
+
+			dragStart = e.GetPosition(Plotter.ViewportPanel).ScreenToData(Plotter.Viewport.Transform);
+			shift = Position - dragStart;
+			dragging = true;
+		}
+
+		protected override void OnMouseLeave(MouseEventArgs e)
+		{
+			ReleaseMouseCapture();
+			dragging = false;
+		}
+
+		protected override void OnMouseMove(MouseEventArgs e)
+		{
+			if (!dragging)
+			{
+				if (IsMouseCaptured)
+					ReleaseMouseCapture();
+
+				return;
+			}
+
+			if (!IsMouseCaptured)
+				CaptureMouse();
+
+			Point mouseInData = e.GetPosition(Plotter.ViewportPanel).ScreenToData(Plotter.Viewport.Transform);
+
+			if (mouseInData != dragStart)
+			{
+				Position = mouseInData + shift;
+				e.Handled = true;
+			}
+		}
+
+		protected override void OnMouseLeftButtonUp(MouseButtonEventArgs e)
+		{
+			if (dragging)
+			{
+				dragging = false;
+				if (IsMouseCaptured)
+				{
+					ReleaseMouseCapture();
+					e.Handled = true;
+				}
+			}
+		}
+
+		protected override Size ArrangeOverride(Size arrangeBounds)
+		{
+			return base.ArrangeOverride(arrangeBounds);
+		}
+	}
+}