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

 1using System;
 2using System.Collections.Generic;
 3using System.Linq;
 4using System.Text;
 5using Microsoft.Research.DynamicDataDisplay.Charts.Shapes;
 6using System.Windows.Media;
 7using System.Windows;
 8using Microsoft.Research.DynamicDataDisplay;
 9using Microsoft.Research.DynamicDataDisplay.Charts.NewLine;
10
11namespace Microsoft.Research.DynamicDataDisplay.Charts.Shapes
12{
13	public class ViewportPolyBezierCurve : ViewportPolylineBase
14	{
15		/// <summary>
16		/// Initializes a new instance of the <see cref="ViewportPolyBezierCurve"/> class.
17		/// </summary>
18		public ViewportPolyBezierCurve() { }
19
20		public PointCollection BezierPoints
21		{
22			get { return (PointCollection)GetValue(BezierPointsProperty); }
23			set { SetValue(BezierPointsProperty, value); }
24		}
25
26		public static readonly DependencyProperty BezierPointsProperty = DependencyProperty.Register(
27		  "BezierPoints",
28		  typeof(PointCollection),
29		  typeof(ViewportPolyBezierCurve),
30		  new FrameworkPropertyMetadata(null, OnPropertyChanged));
31
32		private bool buildBezierPoints = true;
33		public bool BuildBezierPoints
34		{
35			get { return buildBezierPoints; }
36			set { buildBezierPoints = value; }
37		}
38
39		bool updating = false;
40		protected override void UpdateUIRepresentationCore()
41		{
42			if (updating) return;
43			updating = true;
44
45			var transform = Plotter.Viewport.Transform;
46
47			PathGeometry geometry = PathGeometry;
48
49			PointCollection points = Points;
50
51			geometry.Clear();
52
53			if (BezierPoints != null)
54			{
55				points = BezierPoints;
56
57				var screenPoints = points.DataToScreen(transform).ToArray();
58				PathFigure figure = new PathFigure();
59				figure.StartPoint = screenPoints[0];
60				figure.Segments.Add(new PolyBezierSegment(screenPoints.Skip(1), true));
61				geometry.Figures.Add(figure);
62				geometry.FillRule = this.FillRule;
63			}
64			else if (points == null) { }
65			else
66			{
67				PathFigure figure = new PathFigure();
68				if (points.Count > 0)
69				{
70					Point[] bezierPoints = null;
71					figure.StartPoint = points[0].DataToScreen(transform);
72					if (points.Count > 1)
73					{
74						Point[] screenPoints = points.DataToScreen(transform).ToArray();
75
76						bezierPoints = BezierBuilder.GetBezierPoints(screenPoints).Skip(1).ToArray();
77
78						figure.Segments.Add(new PolyBezierSegment(bezierPoints, true));
79					}
80
81					if (bezierPoints != null && buildBezierPoints)
82					{
83						Array.Resize(ref bezierPoints, bezierPoints.Length + 1);
84						Array.Copy(bezierPoints, 0, bezierPoints, 1, bezierPoints.Length - 1);
85						bezierPoints[0] = figure.StartPoint;
86
87						BezierPoints = new PointCollection(bezierPoints.ScreenToData(transform));
88					}
89				}
90
91				geometry.Figures.Add(figure);
92				geometry.FillRule = this.FillRule;
93			}
94
95			updating = false;
96		}
97	}
98}