/Main/src/DynamicDataDisplay/Charts/Shapes/ViewportLine.cs

 1using System;
 2using System.Collections.Generic;
 3using System.Linq;
 4using System.Text;
 5using System.Windows.Media;
 6using System.Windows;
 7
 8namespace Microsoft.Research.DynamicDataDisplay.Charts.Shapes
 9{
10	/// <summary>
11	/// Represents a line in viewport space, coming through given points.
12	/// </summary>
13	public class ViewportLine : ViewportShape
14	{
15		private LineGeometry lineGeometry = new LineGeometry();
16
17		/// <summary>
18		/// Initializes a new instance of the <see cref="ViewportLine"/> class.
19		/// </summary>
20		public ViewportLine() { }
21
22		#region Properties
23
24		#region Point1 property
25
26		/// <summary>
27		/// Gets or sets the first point. It is a DependencyProperty.
28		/// </summary>
29		/// <value>The point1.</value>
30		public Point Point1
31		{
32			get { return (Point)GetValue(Point1Property); }
33			set { SetValue(Point1Property, value); }
34		}
35
36		public static readonly DependencyProperty Point1Property = DependencyProperty.Register(
37		  "Point1",
38		  typeof(Point),
39		  typeof(ViewportLine),
40		  new FrameworkPropertyMetadata(new Point(0, 0), OnPointReplaced));
41
42		private static void OnPointReplaced(DependencyObject d, DependencyPropertyChangedEventArgs e)
43		{
44			ViewportLine owner = (ViewportLine)d;
45			owner.UpdateUIRepresentation();
46		}
47
48		#endregion
49
50		#region Point2 property
51
52		/// <summary>
53		/// Gets or sets the second point. It is a DependencyProperty.
54		/// </summary>
55		/// <value>The point2.</value>
56		public Point Point2
57		{
58			get { return (Point)GetValue(Point2Property); }
59			set { SetValue(Point2Property, value); }
60		}
61
62		public static readonly DependencyProperty Point2Property = DependencyProperty.Register(
63		  "Point2",
64		  typeof(Point),
65		  typeof(ViewportLine),
66		  new FrameworkPropertyMetadata(new Point(1, 1), OnPointReplaced));
67
68		#endregion
69
70		#endregion
71
72		protected override void UpdateUIRepresentationCore()
73		{
74			base.UpdateUIRepresentationCore();
75
76			Viewport2D viewport = Plotter.Viewport;
77			double deltaX = Point1.X - Point2.X;
78			double deltaY = Point1.Y - Point2.Y;
79			double m = deltaY / deltaX;
80			double b = Point1.Y - Point1.X * deltaY / deltaX;
81
82			Func<double, double> func = x => m * x + b;
83
84			double xMin = viewport.Visible.XMin;
85			double xMax = viewport.Visible.XMax;
86			Point p1 = new Point(xMin, func(xMin)).DataToScreen(viewport.Transform);
87			Point p2 = new Point(xMax, func(xMax)).DataToScreen(viewport.Transform);
88
89			lineGeometry.StartPoint = p1;
90			lineGeometry.EndPoint = p2;
91		}
92
93		protected override Geometry DefiningGeometry
94		{
95			get { return lineGeometry; }
96		}
97	}
98}