1 | using System;
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2 | using System.Text.RegularExpressions;
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3 |
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4 | namespace SharpVectors.Dom.Svg
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5 | {
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6 | public sealed class SvgPreserveAspectRatio : ISvgPreserveAspectRatio
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7 | {
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8 | #region Static members
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9 | private static Regex parCheck = new Regex("^(?<align>[A-Za-z]+)\\s*(?<meet>[A-Za-z]*)$");
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10 | #endregion
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11 |
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12 | #region Private Fields
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13 |
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14 | private SvgElement ownerElement;
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15 |
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16 | private SvgMeetOrSlice _meetOrSlice;
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17 | private SvgPreserveAspectRatioType _alignment;
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18 |
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19 | #endregion
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20 |
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21 | #region Constructors
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22 | public SvgPreserveAspectRatio(string attr, SvgElement ownerElement)
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23 | {
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24 | this.ownerElement = ownerElement;
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25 |
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26 | Match match = parCheck.Match(attr.Trim());
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27 | if (match.Groups["align"].Success)
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28 | {
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29 | switch (match.Groups["align"].Value)
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30 | {
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31 | case "none":
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32 | _alignment = SvgPreserveAspectRatioType.None;
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33 | break;
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34 | case "xMinYMin":
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35 | _alignment = SvgPreserveAspectRatioType.XMinYMin;
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36 | break;
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37 | case "xMidYMin":
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38 | _alignment = SvgPreserveAspectRatioType.XMidYMin;
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39 | break;
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40 | case "xMaxYMin":
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41 | _alignment = SvgPreserveAspectRatioType.XMaxYMin;
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42 | break;
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43 | case "xMinYMid":
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44 | _alignment = SvgPreserveAspectRatioType.XMinYMid;
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45 | break;
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46 | case "xMaxYMid":
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47 | _alignment = SvgPreserveAspectRatioType.XMaxYMid;
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48 | break;
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49 | case "xMinYMax":
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50 | _alignment = SvgPreserveAspectRatioType.XMinYMax;
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51 | break;
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52 | case "xMidYMax":
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53 | _alignment = SvgPreserveAspectRatioType.XMidYMax;
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54 | break;
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55 | case "xMaxYMax":
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56 | _alignment = SvgPreserveAspectRatioType.XMaxYMax;
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57 | break;
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58 | default:
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59 | _alignment = SvgPreserveAspectRatioType.XMidYMid;
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60 | break;
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61 | }
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62 | }
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63 | else
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64 | {
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65 | //TODO--PAUL: align = SvgPreserveAspectRatioType.XMidYMid;
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66 | _alignment = SvgPreserveAspectRatioType.XMidYMid;
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67 | }
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68 |
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69 | if (match.Groups["meet"].Success)
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70 | {
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71 | switch (match.Groups["meet"].Value)
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72 | {
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73 | case "slice":
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74 | _meetOrSlice = SvgMeetOrSlice.Slice;
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75 | break;
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76 | case "meet":
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77 | _meetOrSlice = SvgMeetOrSlice.Meet;
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78 | break;
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79 | case "":
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80 | _meetOrSlice = SvgMeetOrSlice.Meet;
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81 | break;
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82 | default:
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83 | _meetOrSlice = SvgMeetOrSlice.Unknown;
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84 | break;
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85 | }
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86 | }
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87 | else
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88 | {
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89 | _meetOrSlice = SvgMeetOrSlice.Meet;
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90 | }
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91 | }
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92 | #endregion
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93 |
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94 | #region Public Methods
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95 |
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96 | public double[] FitToViewBox(SvgRect viewBox, SvgRect rectToFit)
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97 | {
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98 | if (ownerElement is SvgSvgElement)
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99 | {
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100 | ISvgMatrix mat = ((SvgSvgElement)ownerElement).ViewBoxTransform;
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101 | return new double[] { mat.E, mat.F, mat.A, mat.D };
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102 | }
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103 |
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104 | double translateX = 0;
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105 | double translateY = 0;
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106 | double scaleX = 1;
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107 | double scaleY = 1;
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108 |
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109 | if (!viewBox.IsEmpty)
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110 | {
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111 | // calculate scale values for non-uniform scaling
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112 | scaleX = rectToFit.Width / viewBox.Width;
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113 | scaleY = rectToFit.Height / viewBox.Height;
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114 |
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115 | if (_alignment != SvgPreserveAspectRatioType.None)
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116 | {
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117 | // uniform scaling
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118 | if (_meetOrSlice == SvgMeetOrSlice.Meet)
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119 | scaleX = Math.Min(scaleX, scaleY);
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120 | else
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121 | scaleX = Math.Max(scaleX, scaleY);
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122 |
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123 | scaleY = scaleX;
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124 |
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125 | if (_alignment == SvgPreserveAspectRatioType.XMidYMax ||
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126 | _alignment == SvgPreserveAspectRatioType.XMidYMid ||
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127 | _alignment == SvgPreserveAspectRatioType.XMidYMin)
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128 | {
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129 | // align to the Middle X
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130 | translateX = (rectToFit.X + rectToFit.Width / 2) - scaleX * (viewBox.X + viewBox.Width / 2);
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131 | }
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132 | else if (_alignment == SvgPreserveAspectRatioType.XMaxYMax ||
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133 | _alignment == SvgPreserveAspectRatioType.XMaxYMid ||
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134 | _alignment == SvgPreserveAspectRatioType.XMaxYMin)
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135 | {
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136 | // align to the right X
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137 | translateX = (rectToFit.Width - viewBox.Width * scaleX);
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138 | }
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139 |
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140 | if (_alignment == SvgPreserveAspectRatioType.XMaxYMid ||
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141 | _alignment == SvgPreserveAspectRatioType.XMidYMid ||
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142 | _alignment == SvgPreserveAspectRatioType.XMinYMid)
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143 | {
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144 | // align to the Middle Y
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145 | translateY = (rectToFit.Y + rectToFit.Height / 2) - scaleY * (viewBox.Y + viewBox.Height / 2);
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146 | }
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147 | else if (_alignment == SvgPreserveAspectRatioType.XMaxYMax ||
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148 | _alignment == SvgPreserveAspectRatioType.XMidYMax ||
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149 | _alignment == SvgPreserveAspectRatioType.XMinYMax)
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150 | {
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151 | // align to the bottom Y
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152 | translateY = (rectToFit.Height - viewBox.Height * scaleY);
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153 | }
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154 | }
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155 | else
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156 | {
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157 | translateX = -viewBox.X * scaleX;
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158 | translateY = -viewBox.Y * scaleY;
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159 | }
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160 | }
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161 |
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162 | return new double[]{
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163 | translateX,
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164 | translateY,
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165 | scaleX,
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166 | scaleY };
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167 | }
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168 |
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169 | #endregion
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170 |
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171 | #region ISvgPreserveAspectRatio Members
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172 |
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173 | public SvgPreserveAspectRatioType Align
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174 | {
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175 | get
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176 | {
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177 | return _alignment;
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178 | }
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179 | set
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180 | {
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181 | throw new NotImplementedException();
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182 | }
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183 | }
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184 |
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185 | public SvgMeetOrSlice MeetOrSlice
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186 | {
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187 | get
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188 | {
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189 | return _meetOrSlice;
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190 | }
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191 | set
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192 | {
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193 | throw new NotImplementedException();
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194 | }
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195 | }
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196 |
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197 | #endregion
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198 | }
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199 | }
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