/Main/src/DynamicDataDisplay/DependentPlotter.cs

 1using System;
 2using System.Collections.Generic;
 3using System.Linq;
 4using System.Text;
 5using System.Diagnostics;
 6
 7namespace Microsoft.Research.DynamicDataDisplay
 8{
 9	/// <summary>
10	/// Represents a special embedded kind of plotter.
11	/// Follows an outer's plotter Visible change when this is general panning or zooming via MouseNavigation.
12	/// Does not reacts on panning or zooming only in one direction (via AxisNavigation or KeyboardNavigation.
13	/// </summary>
14	public class DependentPlotter : InjectedPlotterBase
15	{
16		/// <summary>
17		/// Initializes a new instance of the <see cref="DependentPlotter"/> class.
18		/// </summary>
19		public DependentPlotter() : base() { }
20
21		protected override DataRect CoerceVisible(DataRect newVisible, DataRect baseVisible)
22		{
23			return baseVisible;
24		}
25
26		private bool IsHandledChangeType(ChangeType changeType)
27		{
28			bool handled = false;
29			switch (changeType)
30			{
31				case ChangeType.Pan:
32				case ChangeType.Zoom:
33					handled = true;
34					break;
35				case ChangeType.PanX:
36				case ChangeType.ZoomX:
37					handled = (ConjunctionMode == ViewportConjunctionMode.X) || (ConjunctionMode == ViewportConjunctionMode.XY);
38					break;
39				case ChangeType.PanY:
40				case ChangeType.ZoomY:
41					handled = (ConjunctionMode == ViewportConjunctionMode.Y) || (ConjunctionMode == ViewportConjunctionMode.XY);
42					break;
43			}
44			return handled;
45		}
46
47		protected override void OuterViewport_PropertyChanged(ExtendedPropertyChangedEventArgs e)
48		{
49			if(e.PropertyName != Viewport2D.VisiblePropertyName)
50				return;
51
52			if (IsHandledChangeType(e.ChangeType))
53			{
54				DataRect newRect = (DataRect)e.NewValue;
55				DataRect oldRect = (DataRect)e.OldValue;
56
57				double ratioX = newRect.Width / oldRect.Width;
58				double ratioY = newRect.Height / oldRect.Height;
59				double shiftX = (newRect.XMin - oldRect.XMin) / oldRect.Width;
60				double shiftY = (newRect.YMin - oldRect.YMin) / oldRect.Height;
61
62				DataRect visible = Viewport.Visible;
63
64				visible.XMin += shiftX * visible.Width;
65				visible.YMin += shiftY * visible.Height;
66				visible.Width *= ratioX;
67				visible.Height *= ratioY;
68
69				Viewport.Visible = visible;
70			}
71		}
72
73		public override void OnPlotterAttached(Plotter plotter)
74		{
75			base.OnPlotterAttached(plotter);
76
77			Plotter.Viewport.FittedToView += Viewport_FittedToView;
78		}
79
80		public override void OnPlotterDetaching(Plotter plotter)
81		{
82			Plotter.Viewport.FittedToView -= Viewport_FittedToView;
83
84			base.OnPlotterDetaching(plotter);
85		}
86
87		private void Viewport_FittedToView(object sender, EventArgs e)
88		{
89			FitToView();
90		}
91
92		protected override void OnConjunctionModeChanged()
93		{
94			// do nothing
95		}
96	}
97}