svn-gvsig-desktop / trunk / org.gvsig.desktop / org.gvsig.desktop.library / org.gvsig.fmap.control / src / main / java / org / gvsig / fmap / mapcontrol / AreaAndPerimeterCalculator.java @ 44259
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1 | 43644 | jjdelcerro | /*
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2 | * To change this license header, choose License Headers in Project Properties.
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3 | * To change this template file, choose Tools | Templates
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4 | * and open the template in the editor.
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5 | */
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6 | package org.gvsig.fmap.mapcontrol; |
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7 | |||
8 | import com.vividsolutions.jts.algorithm.CGAlgorithms; |
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9 | import com.vividsolutions.jts.geom.Coordinate; |
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10 | import com.vividsolutions.jts.geom.CoordinateList; |
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11 | import java.awt.geom.PathIterator; |
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12 | import java.awt.geom.Point2D; |
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13 | import java.util.ArrayList; |
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14 | import org.cresques.cts.GeoCalc; |
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15 | import org.cresques.cts.IProjection; |
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16 | import org.gvsig.fmap.geom.GeometryLocator; |
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17 | import org.gvsig.fmap.geom.GeometryManager; |
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18 | import org.gvsig.fmap.mapcontext.MapContext; |
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19 | |||
20 | public class AreaAndPerimeterCalculator { |
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21 | |||
22 | public double perimeter(org.gvsig.fmap.geom.Geometry geom, IProjection proj, int distanceUnits) { |
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23 | ArrayList parts = getXY(geom);
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24 | double perimeter = 0; |
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25 | for (int j = 0; j < parts.size(); j++) { |
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26 | Double[][] xsys = (Double[][]) parts.get(j); |
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27 | double dist;
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28 | double distAll = 0; |
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29 | |||
30 | for (int i = 0; i < (xsys[0].length - 1); i++) { |
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31 | Point2D p = new Point2D.Double(xsys[0][i], xsys[1][i]); |
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32 | Point2D p2 = new Point2D.Double(xsys[0][i + 1], xsys[1][i + 1]); |
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33 | dist = distanceWorld(p, p2,proj,distanceUnits); |
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34 | distAll += dist; |
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35 | } |
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36 | perimeter += distAll / MapContext.getDistanceTrans2Meter()[distanceUnits]; |
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37 | } |
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38 | return perimeter;
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39 | } |
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40 | |||
41 | public double area(org.gvsig.fmap.geom.Geometry geom, IProjection proj, int areaUnits) { |
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42 | ArrayList parts = getXY(geom);
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43 | double area = 0; |
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44 | for( int i = 0; i < parts.size(); i++ ) { |
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45 | Double[][] xsys = (Double[][]) parts.get(i); |
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46 | Double[] xs = xsys[0]; |
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47 | Double[] ys = xsys[1]; |
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48 | if( isCCW(xs, ys) ) {
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49 | if( proj.isProjected() ) {
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50 | area -= returnCoordsArea( |
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51 | xs, |
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52 | ys, |
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53 | new Point2D.Double(xs[xs.length - 1], ys[ys.length - 1]), |
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54 | areaUnits |
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55 | ); |
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56 | } else {
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57 | area -= returnGeoCArea(xs, ys); |
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58 | } |
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59 | } else {
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60 | if( proj.isProjected() ) {
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61 | area += returnCoordsArea( |
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62 | xs, |
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63 | ys, |
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64 | new Point2D.Double(xs[xs.length - 1], ys[ys.length - 1]), |
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65 | areaUnits |
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66 | ); |
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67 | } else {
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68 | area += returnGeoCArea(xs, ys); |
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69 | } |
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70 | } |
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71 | } |
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72 | return area;
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73 | } |
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74 | |||
75 | public double distanceWorld(Point2D pt1, Point2D pt2, IProjection proj, int distanceUnits) { |
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76 | |||
77 | double dist;
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78 | if (proj.isProjected()) {
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79 | dist = pt1.distance(pt2); |
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80 | dist = dist * MapContext.getDistanceTrans2Meter()[distanceUnits]; |
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81 | } |
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82 | else {
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83 | GeoCalc geocalc = new GeoCalc(proj);
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84 | dist = geocalc.distanceVincenty(pt1, pt2); |
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85 | } |
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86 | return dist;
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87 | } |
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88 | |||
89 | public boolean isCCW(Double[] xs, Double[] ys) { |
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90 | CoordinateList coordList = new CoordinateList();
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91 | for( int i = 0; i < ys.length; i++ ) { |
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92 | Coordinate coord = new Coordinate(xs[i], ys[i]);
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93 | coordList.add(coord); |
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94 | } |
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95 | if( coordList.isEmpty() ) {
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96 | return true; |
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97 | } |
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98 | return CGAlgorithms.isCCW(coordList.toCoordinateArray());
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99 | } |
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100 | |||
101 | private double returnGeoCArea(Double[] xs, Double[] ys) { |
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102 | double[] lat = new double[xs.length]; |
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103 | double[] lon = new double[xs.length]; |
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104 | for( int K = 0; K < xs.length; K++ ) { |
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105 | lon[K] = xs[K] / org.gvsig.fmap.mapcontrol.tools.geo.Geo.Degree; |
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106 | lat[K] = ys[K] / org.gvsig.fmap.mapcontrol.tools.geo.Geo.Degree; |
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107 | } |
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108 | return (org.gvsig.fmap.mapcontrol.tools.geo.Geo.sphericalPolyArea(lat, lon, xs.length - 1) * org.gvsig.fmap.mapcontrol.tools.geo.Geo.SqM); |
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109 | } |
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110 | |||
111 | /**
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112 | * Calcula el ?rea.
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113 | *
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114 | * @param xs
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115 | * @param ys
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116 | * @param point
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117 | * @param areaUnits
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118 | *
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119 | * @return ?rea.
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120 | */
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121 | public double returnCoordsArea(Double[] xs, Double[] ys, Point2D point, int areaUnits) { |
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122 | Point2D aux = point;
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123 | double elArea = 0.0; |
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124 | Point2D pPixel;
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125 | Point2D p;// = new Point2D.Double(); |
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126 | Point2D.Double pAnt = new Point2D.Double(); |
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127 | for( int pos = 0; pos < xs.length - 1; pos++ ) { |
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128 | pPixel = new Point2D.Double(xs[pos], ys[pos]); |
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129 | p = pPixel; |
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130 | if( pos == 0 ) { |
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131 | pAnt.x = aux.getX(); |
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132 | pAnt.y = aux.getY(); |
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133 | } |
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134 | elArea = elArea + ((pAnt.x - p.getX()) * (pAnt.y + p.getY())); |
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135 | pAnt.setLocation(p); |
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136 | } |
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137 | |||
138 | elArea = elArea + ((pAnt.x - aux.getX()) * (pAnt.y + aux.getY())); |
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139 | elArea = Math.abs(elArea / 2.0); |
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140 | return (elArea / (Math.pow(MapContext.getAreaTrans2Meter()[areaUnits], 2))); |
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141 | } |
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142 | |||
143 | public ArrayList getXY(org.gvsig.fmap.geom.Geometry geometry) { |
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144 | ArrayList xs = new ArrayList(); |
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145 | ArrayList ys = new ArrayList(); |
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146 | ArrayList parts = new ArrayList(); |
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147 | double[] theData = new double[6]; |
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148 | |||
149 | //double[] aux = new double[6];
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150 | PathIterator theIterator;
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151 | int theType;
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152 | int numParts = 0; |
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153 | GeometryManager geomManager = GeometryLocator.getGeometryManager(); |
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154 | theIterator = geometry.getPathIterator(null, geomManager.getFlatness()); //, flatness); |
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155 | boolean isClosed = false; |
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156 | while( !theIterator.isDone() ) {
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157 | theType = theIterator.currentSegment(theData); |
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158 | |||
159 | switch( theType ) {
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160 | case PathIterator.SEG_MOVETO: |
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161 | if( numParts == 0 ) { |
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162 | xs.add(theData[0]);
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163 | ys.add(theData[1]);
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164 | } else {
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165 | if( !isClosed ) {
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166 | Double[] x = (Double[]) xs.toArray(new Double[0]); |
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167 | Double[] y = (Double[]) ys.toArray(new Double[0]); |
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168 | parts.add(new Double[][]{x, |
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169 | y}); |
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170 | xs.clear(); |
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171 | ys.clear(); |
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172 | } |
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173 | xs.add(theData[0]);
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174 | ys.add(theData[1]);
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175 | } |
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176 | numParts++; |
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177 | isClosed = false;
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178 | break;
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179 | case PathIterator.SEG_LINETO: |
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180 | isClosed = false;
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181 | xs.add(theData[0]);
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182 | ys.add(theData[1]);
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183 | break;
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184 | case PathIterator.SEG_CLOSE: |
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185 | isClosed = true;
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186 | xs.add(theData[0]);
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187 | ys.add(theData[1]);
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188 | Double[] x = (Double[]) xs.toArray(new Double[0]); |
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189 | Double[] y = (Double[]) ys.toArray(new Double[0]); |
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190 | parts.add(new Double[][]{x, |
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191 | y}); |
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192 | xs.clear(); |
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193 | ys.clear(); |
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194 | break;
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195 | } //end switch
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196 | |||
197 | theIterator.next(); |
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198 | } //end while loop
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199 | |||
200 | if( !isClosed ) {
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201 | // isClosed=true;
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202 | xs.add(theData[0]);
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203 | ys.add(theData[1]);
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204 | Double[] x = (Double[]) xs.toArray(new Double[0]); |
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205 | Double[] y = (Double[]) ys.toArray(new Double[0]); |
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206 | parts.add(new Double[][]{x, |
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207 | y}); |
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208 | xs.clear(); |
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209 | ys.clear(); |
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210 | } |
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211 | return parts;
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212 | |||
213 | } |
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214 | |||
215 | } |