1 | using System;
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2 | using System.Collections.Generic;
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3 | using System.Linq;
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4 | using System.Text;
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5 | using System.Windows;
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6 | using System.Windows.Controls;
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7 | using System.Windows.Shapes;
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8 | using System.Windows.Media;
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9 | using System.Windows.Input;
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10 | using Microsoft.Research.DynamicDataDisplay.Common.DataSearch;
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11 | using System.Diagnostics;
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12 | using System.Windows.Markup;
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13 | using System.ComponentModel;
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14 | using System.Diagnostics.Contracts;
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15 |
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16 | namespace Microsoft.Research.DynamicDataDisplay.Charts
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17 | {
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18 | /// <summary>
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19 | /// Represents a marker with position.X bound to mouse cursor's position and position.Y is determined by interpolation of <see cref="MarkerPointsGraph"/>'s points.
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20 | /// </summary>
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21 | [ContentProperty("MarkerTemplate")]
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22 | public class DataFollowChart : ViewportHostPanel, INotifyPropertyChanged
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23 | {
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24 | /// <summary>
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25 | /// Initializes a new instance of the <see cref="DataFollowChart"/> class.
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26 | /// </summary>
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27 | public DataFollowChart()
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28 | {
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29 | Marker = CreateDefaultMarker();
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30 | SetX(marker, 0);
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31 | SetY(marker, 0);
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32 | Children.Add(marker);
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33 | }
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34 |
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35 | private static Ellipse CreateDefaultMarker()
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36 | {
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37 | return new Ellipse
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38 | {
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39 | Width = 10,
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40 | Height = 10,
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41 | Stroke = Brushes.Green,
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42 | StrokeThickness = 1,
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43 | Fill = Brushes.LightGreen,
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44 | Visibility = Visibility.Hidden
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45 | };
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46 | }
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47 |
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48 | /// <summary>
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49 | /// Initializes a new instance of the <see cref="DataFollowChart"/> class, bound to specified <see cref="PointsGraphBase"/>.
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50 | /// </summary>
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51 | /// <param name="pointSource">The point source.</param>
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52 | public DataFollowChart(PointsGraphBase pointSource)
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53 | : this()
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54 | {
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55 | PointSource = pointSource;
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56 | }
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57 |
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58 | #region MarkerTemplate property
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59 |
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60 | /// <summary>
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61 | /// Gets or sets the template, used to create a marker. This is a dependency property.
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62 | /// </summary>
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63 | /// <value>The marker template.</value>
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64 | public DataTemplate MarkerTemplate
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65 | {
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66 | get { return (DataTemplate)GetValue(MarkerTemplateProperty); }
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67 | set { SetValue(MarkerTemplateProperty, value); }
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68 | }
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69 |
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70 | /// <summary>
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71 | /// Identifies the <see cref="MarkerTemplate"/> dependency property.
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72 | /// </summary>
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73 | public static readonly DependencyProperty MarkerTemplateProperty = DependencyProperty.Register(
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74 | "MarkerTemplate",
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75 | typeof(DataTemplate),
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76 | typeof(DataFollowChart),
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77 | new FrameworkPropertyMetadata(null, OnMarkerTemplateChanged));
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78 |
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79 | private static void OnMarkerTemplateChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
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80 | {
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81 | DataFollowChart chart = (DataFollowChart)d;
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82 | DataTemplate template = (DataTemplate)e.NewValue;
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83 |
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84 | FrameworkElement marker;
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85 | if (template != null)
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86 | {
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87 | marker = (FrameworkElement)template.LoadContent();
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88 | }
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89 | else
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90 | {
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91 | marker = CreateDefaultMarker();
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92 | }
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93 |
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94 | chart.Children.Remove(chart.marker);
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95 | chart.Marker = marker;
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96 | chart.Children.Add(marker);
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97 | }
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98 |
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99 | #endregion
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100 |
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101 | #region Point sources
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102 |
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103 | /// <summary>
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104 | /// Gets or sets the source of points.
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105 | /// Can be null.
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106 | /// </summary>
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107 | /// <value>The point source.</value>
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108 | public PointsGraphBase PointSource
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109 | {
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110 | get { return (PointsGraphBase)GetValue(PointSourceProperty); }
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111 | set { SetValue(PointSourceProperty, value); }
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112 | }
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113 |
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114 | /// <summary>
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115 | /// Identifies the <see cref="PointSource"/> dependency property.
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116 | /// </summary>
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117 | public static readonly DependencyProperty PointSourceProperty = DependencyProperty.Register(
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118 | "PointSource",
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119 | typeof(PointsGraphBase),
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120 | typeof(DataFollowChart),
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121 | new FrameworkPropertyMetadata(null, OnPointSourceChanged));
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122 |
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123 | private static void OnPointSourceChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
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124 | {
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125 | DataFollowChart chart = (DataFollowChart)d;
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126 |
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127 | PointsGraphBase previous = e.OldValue as PointsGraphBase;
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128 | if (previous != null)
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129 | {
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130 | previous.VisiblePointsChanged -= chart.Source_VisiblePointsChanged;
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131 | }
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132 |
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133 | PointsGraphBase current = e.NewValue as PointsGraphBase;
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134 | if (current != null)
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135 | {
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136 | current.ProvideVisiblePoints = true;
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137 | current.VisiblePointsChanged += chart.Source_VisiblePointsChanged;
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138 | if (current.VisiblePoints != null)
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139 | {
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140 | chart.searcher = new SortedXSearcher1d(current.VisiblePoints);
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141 | }
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142 | }
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143 |
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144 | chart.UpdateUIRepresentation();
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145 | }
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146 |
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147 | private SearchResult1d searchResult = SearchResult1d.Empty;
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148 | private SortedXSearcher1d searcher;
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149 | private FrameworkElement marker;
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150 |
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151 | [NotNull]
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152 | public FrameworkElement Marker
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153 | {
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154 | get { return marker; }
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155 | protected set
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156 | {
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157 | Contract.Assert(value != null);
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158 |
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159 | marker = value;
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160 | marker.DataContext = followDataContext;
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161 | PropertyChanged.Raise(this, "Marker");
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162 | }
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163 | }
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164 |
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165 | private FollowDataContext followDataContext = new FollowDataContext();
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166 | public FollowDataContext FollowDataContext
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167 | {
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168 | get { return followDataContext; }
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169 | }
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170 |
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171 | private void UpdateUIRepresentation()
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172 | {
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173 | if (Plotter == null)
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174 | return;
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175 |
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176 | PointsGraphBase source = this.PointSource;
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177 |
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178 | if (source == null || (source != null && source.VisiblePoints == null))
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179 | {
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180 | SetValue(MarkerPositionPropertyKey, new Point(Double.NaN, Double.NaN));
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181 | marker.Visibility = Visibility.Hidden;
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182 | return;
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183 | }
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184 | else
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185 | {
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186 | Point mousePos = Mouse.GetPosition(Plotter.CentralGrid);
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187 |
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188 | var transform = Plotter.Transform;
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189 | Point viewportPos = mousePos.ScreenToViewport(transform);
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190 |
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191 | double x = viewportPos.X;
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192 | searchResult = searcher.SearchXBetween(x, searchResult);
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193 | SetValue(ClosestPointIndexPropertyKey, searchResult.Index);
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194 | if (!searchResult.IsEmpty)
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195 | {
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196 | marker.Visibility = Visibility.Visible;
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197 |
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198 | IList<Point> points = source.VisiblePoints;
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199 | Point ptBefore = points[searchResult.Index];
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200 | Point ptAfter = points[searchResult.Index + 1];
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201 |
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202 | double ratio = (x - ptBefore.X) / (ptAfter.X - ptBefore.X);
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203 | double y = ptBefore.Y + (ptAfter.Y - ptBefore.Y) * ratio;
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204 |
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205 | Point temp = new Point(x, y);
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206 | SetX(marker, temp.X);
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207 | SetY(marker, temp.Y);
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208 |
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209 | Point markerPosition = temp;
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210 | followDataContext.Position = markerPosition;
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211 | SetValue(MarkerPositionPropertyKey, markerPosition);
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212 | }
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213 | else
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214 | {
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215 | SetValue(MarkerPositionPropertyKey, new Point(Double.NaN, Double.NaN));
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216 | marker.Visibility = Visibility.Hidden;
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217 | }
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218 | }
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219 | }
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220 |
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221 | #region ClosestPointIndex property
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222 |
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223 | private static readonly DependencyPropertyKey ClosestPointIndexPropertyKey = DependencyProperty.RegisterReadOnly(
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224 | "ClosestPointIndex",
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225 | typeof(int),
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226 | typeof(DataFollowChart),
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227 | new PropertyMetadata(-1)
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228 | );
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229 |
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230 | public static readonly DependencyProperty ClosestPointIndexProperty = ClosestPointIndexPropertyKey.DependencyProperty;
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231 |
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232 | public int ClosestPointIndex
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233 | {
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234 | get { return (int)GetValue(ClosestPointIndexProperty); }
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235 | }
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236 |
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237 | #endregion
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238 |
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239 | #region MarkerPositionProperty
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240 |
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241 | private static readonly DependencyPropertyKey MarkerPositionPropertyKey = DependencyProperty.RegisterReadOnly(
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242 | "MarkerPosition",
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243 | typeof(Point),
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244 | typeof(DataFollowChart),
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245 | new PropertyMetadata(new Point(), OnMarkerPositionChanged));
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246 |
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247 | private static void OnMarkerPositionChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
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248 | {
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249 | DataFollowChart chart = (DataFollowChart)d;
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250 | chart.MarkerPositionChanged.Raise(chart);
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251 | }
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252 |
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253 | /// <summary>
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254 | /// Identifies the <see cref="MarkerPosition"/> dependency property.
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255 | /// </summary>
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256 | public static readonly DependencyProperty MarkerPositionProperty = MarkerPositionPropertyKey.DependencyProperty;
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257 |
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258 | /// <summary>
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259 | /// Gets the marker position.
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260 | /// </summary>
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261 | /// <value>The marker position.</value>
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262 | public Point MarkerPosition
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263 | {
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264 | get { return (Point)GetValue(MarkerPositionProperty); }
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265 | }
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266 |
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267 | /// <summary>
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268 | /// Occurs when marker position changes.
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269 | /// </summary>
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270 | public event EventHandler MarkerPositionChanged;
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271 |
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272 | #endregion
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273 |
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274 | public override void OnPlotterAttached(Plotter plotter)
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275 | {
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276 | base.OnPlotterAttached(plotter);
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277 | plotter.MainGrid.MouseMove += MainGrid_MouseMove;
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278 | }
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279 |
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280 | private void MainGrid_MouseMove(object sender, MouseEventArgs e)
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281 | {
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282 | UpdateUIRepresentation();
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283 | }
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284 |
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285 | public override void OnPlotterDetaching(Plotter plotter)
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286 | {
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287 | plotter.MainGrid.MouseMove -= MainGrid_MouseMove;
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288 | base.OnPlotterDetaching(plotter);
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289 | }
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290 |
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291 | protected override void Viewport_PropertyChanged(object sender, ExtendedPropertyChangedEventArgs e)
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292 | {
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293 | base.Viewport_PropertyChanged(sender, e);
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294 | UpdateUIRepresentation();
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295 | }
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296 |
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297 | private void Source_VisiblePointsChanged(object sender, EventArgs e)
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298 | {
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299 | PointsGraphBase source = (PointsGraphBase)sender;
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300 | if (source.VisiblePoints != null)
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301 | {
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302 | searcher = new SortedXSearcher1d(source.VisiblePoints);
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303 | }
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304 | UpdateUIRepresentation();
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305 | }
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306 |
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307 | #endregion
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308 |
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309 | #region INotifyPropertyChanged Members
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310 |
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311 | /// <summary>
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312 | /// Occurs when a property value changes.
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313 | /// </summary>
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314 | public event PropertyChangedEventHandler PropertyChanged;
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315 |
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316 | #endregion
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317 | }
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318 |
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319 | /// <summary>
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320 | /// Represents a special data context, which encapsulates marker's position and custom data.
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321 | /// Used in <see cref="DataFollowChart"/>.
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322 | /// </summary>
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323 | public class FollowDataContext : INotifyPropertyChanged
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324 | {
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325 | private Point position;
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326 | /// <summary>
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327 | /// Gets or sets the position of marker.
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328 | /// </summary>
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329 | /// <value>The position.</value>
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330 | public Point Position
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331 | {
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332 | get { return position; }
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333 | set
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334 | {
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335 | position = value;
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336 | PropertyChanged.Raise(this, "Position");
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337 | }
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338 | }
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339 |
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340 | private object data;
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341 | /// <summary>
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342 | /// Gets or sets the additional custom data.
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343 | /// </summary>
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344 | /// <value>The data.</value>
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345 | public object Data
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346 | {
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347 | get { return data; }
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348 | set
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349 | {
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350 | data = value;
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351 | PropertyChanged.Raise(this, "Data");
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352 | }
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353 | }
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354 |
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355 | #region INotifyPropertyChanged Members
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356 |
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357 | /// <summary>
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358 | /// Occurs when a property value changes.
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359 | /// </summary>
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360 | public event PropertyChangedEventHandler PropertyChanged;
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361 |
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362 | #endregion
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363 | }
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364 | }
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