svn-gvsig-desktop / trunk / applications / appgvSIG / src / com / vividsolutions / jump / util / CoordinateArrays.java @ 312
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1 | 312 | fernando | |
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2 | /*
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3 | * The Unified Mapping Platform (JUMP) is an extensible, interactive GUI
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4 | * for visualizing and manipulating spatial features with geometry and attributes.
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5 | *
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6 | * Copyright (C) 2003 Vivid Solutions
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7 | *
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8 | * This program is free software; you can redistribute it and/or
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9 | * modify it under the terms of the GNU General Public License
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10 | * as published by the Free Software Foundation; either version 2
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11 | * of the License, or (at your option) any later version.
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12 | *
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13 | * This program is distributed in the hope that it will be useful,
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14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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16 | * GNU General Public License for more details.
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17 | *
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18 | * You should have received a copy of the GNU General Public License
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19 | * along with this program; if not, write to the Free Software
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20 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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21 | *
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22 | * For more information, contact:
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23 | *
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24 | * Vivid Solutions
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25 | * Suite #1A
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26 | * 2328 Government Street
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27 | * Victoria BC V8T 5G5
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28 | * Canada
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29 | *
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30 | * (250)385-6040
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31 | * www.vividsolutions.com
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32 | */
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33 | |||
34 | package com.vividsolutions.jump.util; |
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35 | |||
36 | import java.util.*; |
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37 | |||
38 | import com.vividsolutions.jts.algorithm.CGAlgorithms; |
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39 | import com.vividsolutions.jts.algorithm.RobustCGAlgorithms; |
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40 | import com.vividsolutions.jts.geom.*; |
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41 | import com.vividsolutions.jts.util.Assert; |
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42 | |||
43 | |||
44 | /**
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45 | * Some utility functions for handling Coordinate arrays.
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46 | */
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47 | public class CoordinateArrays { |
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48 | //<<TODO:REFACTORING>> JTS already has a class named CoordinateArrays.
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49 | //I wonder if we should collapse this class into that one. [Jon Aquino]
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50 | // MD - yep, at some point.
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51 | private static final CGAlgorithms cga = new RobustCGAlgorithms(); |
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52 | private final static Coordinate[] coordArrayType = new Coordinate[0]; |
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53 | |||
54 | public static Coordinate[] toCoordinateArray(List coordList) { |
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55 | return (Coordinate[]) coordList.toArray(coordArrayType); |
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56 | } |
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57 | |||
58 | //<<TODO:REFACTORING>> This functionality is duplicated in
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59 | //the protected method Geometry#reversePointOrder. Perhaps we should
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60 | //make that method public and deprecate this method, or have this method
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61 | //delegate to the other. [Jon Aquino]
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62 | //MD: Geometry#reversePointOrder could delegate to this method. Can't do it other way around.
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63 | public static void reverse(Coordinate[] coord) { |
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64 | int last = coord.length - 1; |
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65 | int mid = last / 2; |
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66 | |||
67 | for (int i = 0; i <= mid; i++) { |
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68 | Coordinate tmp = coord[i]; |
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69 | coord[i] = coord[last - i]; |
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70 | coord[last - i] = tmp; |
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71 | } |
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72 | } |
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73 | |||
74 | /**
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75 | * Converts an array of coordinates to a line or point, as appropriate.
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76 | * @param coords the coordinates of a line or point
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77 | * @param fact a factory used to create the Geometry
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78 | * @return a line if there is more than one coordinate; a point if there is
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79 | * just one coordinate; an empty point otherwise
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80 | */
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81 | public static Geometry toLineOrPoint(Coordinate[] coords, |
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82 | GeometryFactory fact) { |
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83 | if (coords.length > 1) { |
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84 | return fact.createLineString(coords);
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85 | } |
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86 | |||
87 | if (coords.length == 1) { |
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88 | return fact.createPoint(coords[0]); |
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89 | } |
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90 | |||
91 | return fact.createPoint((Coordinate)null); |
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92 | } |
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93 | |||
94 | public static boolean equals(Coordinate[] coord1, Coordinate[] coord2) { |
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95 | if (coord1 == coord2) {
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96 | return true; |
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97 | } |
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98 | |||
99 | if ((coord1 == null) || (coord2 == null)) { |
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100 | return false; |
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101 | } |
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102 | |||
103 | if (coord1.length != coord2.length) {
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104 | return false; |
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105 | } |
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106 | |||
107 | for (int i = 0; i < coord1.length; i++) { |
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108 | if (!coord1[i].equals(coord2[i])) {
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109 | return false; |
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110 | } |
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111 | } |
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112 | |||
113 | return true; |
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114 | } |
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115 | |||
116 | /**
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117 | * Converts a collection of coordinate arrays to a collection of geometries.
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118 | * @param coordArrays a collection of Coordinate[]
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119 | * @param fact a factory used to create the Geometries
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120 | * @return a collection of LineStrings and Points
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121 | */
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122 | public static List fromCoordinateArrays(List coordArrays, |
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123 | GeometryFactory fact) { |
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124 | List geomList = new ArrayList(); |
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125 | |||
126 | for (Iterator i = coordArrays.iterator(); i.hasNext();) { |
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127 | Coordinate[] coords = (Coordinate[]) i.next(); |
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128 | Geometry geom = toLineOrPoint(coords, fact); |
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129 | geomList.add(geom); |
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130 | } |
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131 | |||
132 | return geomList;
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133 | } |
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134 | |||
135 | /**
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136 | * Extract the coordinate arrays for a geometry into a List.
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137 | * @param g the Geometry to extract from
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138 | * @param coordArrayList the List to add the coordinate arrays to
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139 | * @param orientPolygons whether or not the arrays in the List should be
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140 | * oriented (clockwise for the shell, counterclockwise for the holes)
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141 | */
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142 | public static void addCoordinateArrays(Geometry g, boolean orientPolygons, |
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143 | List coordArrayList) {
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144 | if (g.getDimension() <= 0) { |
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145 | return;
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146 | } else if (g instanceof LineString) { |
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147 | LineString l = (LineString) g; |
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148 | coordArrayList.add(l.getCoordinates()); |
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149 | } else if (g instanceof Polygon) { |
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150 | Polygon poly = (Polygon) g; |
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151 | Coordinate[] shell = poly.getExteriorRing().getCoordinates();
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152 | |||
153 | if (orientPolygons) {
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154 | shell = ensureOrientation(shell, CGAlgorithms.CLOCKWISE); |
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155 | } |
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156 | |||
157 | coordArrayList.add(shell); |
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158 | |||
159 | for (int i = 0; i < poly.getNumInteriorRing(); i++) { |
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160 | Coordinate[] hole = poly.getInteriorRingN(i).getCoordinates();
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161 | |||
162 | if (orientPolygons) {
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163 | hole = ensureOrientation(hole, CGAlgorithms.COUNTERCLOCKWISE); |
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164 | } |
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165 | |||
166 | coordArrayList.add(hole); |
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167 | } |
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168 | } else if (g instanceof GeometryCollection) { |
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169 | GeometryCollection gc = (GeometryCollection) g; |
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170 | |||
171 | for (int i = 0; i < gc.getNumGeometries(); i++) { |
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172 | addCoordinateArrays(gc.getGeometryN(i), orientPolygons, |
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173 | coordArrayList); |
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174 | } |
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175 | } else {
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176 | Assert.shouldNeverReachHere("Geometry of type " +
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177 | g.getClass().getName() + " not handled");
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178 | } |
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179 | } |
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180 | |||
181 | /**
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182 | * Sets the orientation of an array of coordinates.
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183 | * @param coord the coordinates to inspect
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184 | * @param desiredOrientation CGAlgorithms.CLOCKWISE or CGAlgorithms.COUNTERCLOCKWISE
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185 | * @return a new array with entries in reverse order, if the orientation is
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186 | * incorrect; otherwise, the original array
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187 | */
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188 | public static Coordinate[] ensureOrientation(Coordinate[] coord, |
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189 | int desiredOrientation) {
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190 | if (coord.length == 0) { |
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191 | return coord;
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192 | } |
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193 | |||
194 | int orientation = cga.isCCW(coord) ? CGAlgorithms.COUNTERCLOCKWISE
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195 | : CGAlgorithms.CLOCKWISE; |
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196 | |||
197 | if (orientation != desiredOrientation) {
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198 | Coordinate[] reverse = (Coordinate[]) coord.clone(); |
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199 | CoordinateArrays.reverse(reverse); |
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200 | |||
201 | return reverse;
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202 | } |
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203 | |||
204 | return coord;
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205 | } |
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206 | |||
207 | /**
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208 | * Extract the coordinate arrays for a geometry.
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209 | * Polygons will be checked to ensure their rings are oriented correctly.
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210 | * Note: coordinates from Points or MultiPoints will not be extracted.
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211 | * @param g the Geometry to extract from
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212 | * @param orientPolygons ensure that Polygons are correctly oriented
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213 | * @return a list of Coordinate[]
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214 | */
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215 | public static List toCoordinateArrays(Geometry g, boolean orientPolygons) { |
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216 | List coordArrayList = new ArrayList(); |
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217 | addCoordinateArrays(g, orientPolygons, coordArrayList); |
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218 | |||
219 | return coordArrayList;
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220 | } |
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221 | } |