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.Collections.ObjectModel;
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7 | using System.Collections.Specialized;
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8 |
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9 | namespace Microsoft.Research.DynamicDataDisplay.ViewportConstraints
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10 | {
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11 | public class DataHeightConstraint : ViewportConstraint, ISupportAttachToViewport
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12 | {
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13 | private double yEnlargeCoeff = 1.1;
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14 | public double YEnlargeCoeff
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15 | {
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16 | get { return yEnlargeCoeff; }
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17 | set
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18 | {
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19 | if (yEnlargeCoeff != value)
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20 | {
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21 | yEnlargeCoeff = value;
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22 | RaiseChanged();
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23 | }
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24 | }
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25 | }
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26 |
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27 | public override DataRect Apply(DataRect oldDataRect, DataRect newDataRect, Viewport2D viewport)
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28 | {
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29 | DataRect overallBounds = DataRect.Empty;
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30 |
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31 | foreach (var chart in viewport.ContentBoundsHosts)
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32 | {
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33 | var plotterElement = chart as IPlotterElement;
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34 | //var visual = viewport.Plotter.VisualBindings[plotterElement];
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35 | var visual = plotterElement as DependencyObject;
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36 | if (visual == null)
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37 | continue;
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38 |
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39 | var points = (ReadOnlyCollection<Point>)PointsGraphBase.GetVisiblePoints(visual);
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40 | if (points != null)
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41 | {
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42 |
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43 | // searching for indices of chart's visible points which are near left and right borders of newDataRect
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44 | double startX = newDataRect.XMin;
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45 | double endX = newDataRect.XMax;
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46 |
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47 | if (points[0].X > endX || points[points.Count - 1].X < startX)
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48 | {
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49 | continue;
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50 | }
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51 |
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52 | int startIndex = -1;
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53 |
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54 | // we assume that points are sorted by x values ascending
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55 | if (startX <= points[0].X)
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56 | {
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57 | startIndex = 0;
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58 | }
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59 | else
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60 | {
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61 | for (int i = 1; i < points.Count - 1; i++)
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62 | {
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63 | if (points[i].X <= startX && startX < points[i + 1].X)
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64 | {
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65 | startIndex = i;
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66 | break;
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67 | }
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68 | }
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69 | }
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70 |
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71 | int endIndex = points.Count;
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72 |
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73 | if (points[points.Count - 1].X < endX)
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74 | {
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75 | endIndex = points.Count;
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76 | }
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77 | else
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78 | {
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79 | for (int i = points.Count - 1; i >= 1; i--)
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80 | {
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81 | if (points[i - 1].X <= endX && endX < points[i].X)
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82 | {
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83 | endIndex = i;
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84 | break;
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85 | }
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86 | }
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87 | }
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88 |
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89 | Rect bounds = Rect.Empty;
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90 | for (int i = startIndex; i < endIndex; i++)
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91 | {
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92 | bounds.Union(points[i]);
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93 | }
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94 | if (startIndex > 0)
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95 | {
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96 | Point pt = GetInterpolatedPoint(startX, points[startIndex], points[startIndex - 1]);
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97 | bounds.Union(pt);
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98 | }
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99 | if (endIndex < points.Count - 1)
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100 | {
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101 | Point pt = GetInterpolatedPoint(endX, points[endIndex], points[endIndex + 1]);
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102 | bounds.Union(pt);
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103 | }
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104 |
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105 | overallBounds.Union(bounds);
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106 | }
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107 | }
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108 |
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109 | if (!overallBounds.IsEmpty)
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110 | {
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111 | double y = overallBounds.YMin;
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112 | double height = overallBounds.Height;
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113 |
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114 | if (height == 0)
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115 | {
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116 | height = newDataRect.Height;
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117 | y -= height / 2;
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118 | }
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119 |
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120 | newDataRect = new DataRect(newDataRect.XMin, y, newDataRect.Width, height);
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121 | newDataRect = DataRectExtensions.ZoomY(newDataRect, newDataRect.GetCenter(), yEnlargeCoeff);
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122 | }
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123 |
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124 | return newDataRect;
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125 | }
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126 |
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127 | private static Point GetInterpolatedPoint(double x, Point p1, Point p2)
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128 | {
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129 | double xRatio = (x - p1.X) / (p2.X - p1.X);
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130 | double y = (1 - xRatio) * p1.Y + xRatio * p2.Y;
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131 |
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132 | return new Point(x, y);
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133 | }
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134 |
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135 | #region ISupportAttach Members
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136 |
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137 | void ISupportAttachToViewport.Attach(Viewport2D viewport)
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138 | {
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139 | ((INotifyCollectionChanged)viewport.ContentBoundsHosts).CollectionChanged += OnContentBoundsHostsChanged;
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140 |
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141 | foreach (var item in viewport.ContentBoundsHosts)
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142 | {
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143 | PointsGraphBase chart = item as PointsGraphBase;
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144 | if (chart != null)
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145 | {
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146 | chart.ProvideVisiblePoints = true;
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147 | }
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148 | }
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149 | }
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150 |
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151 | private void OnContentBoundsHostsChanged(object sender, NotifyCollectionChangedEventArgs e)
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152 | {
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153 | if (e.NewItems != null)
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154 | {
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155 | foreach (var item in e.NewItems)
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156 | {
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157 | PointsGraphBase chart = item as PointsGraphBase;
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158 | if (chart != null)
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159 | {
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160 | chart.ProvideVisiblePoints = true;
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161 | }
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162 | }
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163 | }
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164 |
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165 | // todo probably set ProvideVisiblePoints to false on OldItems
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166 | }
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167 |
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168 | void ISupportAttachToViewport.Detach(Viewport2D viewport)
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169 | {
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170 | ((INotifyCollectionChanged)viewport.ContentBoundsHosts).CollectionChanged -= OnContentBoundsHostsChanged;
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171 | }
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172 |
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173 | #endregion
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174 | }
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175 | }
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