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/*
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* To change this license header, choose License Headers in Project Properties.
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* To change this template file, choose Tools | Templates
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* and open the template in the editor.
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*/
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package org.gvsig.fmap.mapcontrol;
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import com.vividsolutions.jts.algorithm.CGAlgorithms;
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import com.vividsolutions.jts.geom.Coordinate;
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import com.vividsolutions.jts.geom.CoordinateList;
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import java.awt.geom.PathIterator;
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import java.awt.geom.Point2D;
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import java.util.ArrayList;
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import org.cresques.cts.GeoCalc;
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import org.cresques.cts.IProjection;
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import org.gvsig.fmap.geom.GeometryLocator;
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import org.gvsig.fmap.geom.GeometryManager;
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import org.gvsig.fmap.mapcontext.MapContext;
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public class AreaAndPerimeterCalculator {
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public double perimeter(org.gvsig.fmap.geom.Geometry geom, IProjection proj, int distanceUnits) {
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ArrayList parts = getXY(geom);
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double perimeter = 0;
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for (int j = 0; j < parts.size(); j++) {
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Double[][] xsys = (Double[][]) parts.get(j);
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double dist;
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double distAll = 0;
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for (int i = 0; i < (xsys[0].length - 1); i++) {
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Point2D p = new Point2D.Double(xsys[0][i], xsys[1][i]);
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Point2D p2 = new Point2D.Double(xsys[0][i + 1], xsys[1][i + 1]);
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dist = distanceWorld(p, p2,proj,distanceUnits);
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distAll += dist;
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}
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perimeter += distAll / MapContext.getDistanceTrans2Meter()[distanceUnits];
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}
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return perimeter;
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}
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public double area(org.gvsig.fmap.geom.Geometry geom, IProjection proj, int areaUnits) {
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ArrayList parts = getXY(geom);
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double area = 0;
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for( int i = 0; i < parts.size(); i++ ) {
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Double[][] xsys = (Double[][]) parts.get(i);
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Double[] xs = xsys[0];
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Double[] ys = xsys[1];
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if( isCCW(xs, ys) ) {
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if( proj.isProjected() ) {
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area -= returnCoordsArea(
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xs,
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ys,
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new Point2D.Double(xs[xs.length - 1], ys[ys.length - 1]),
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areaUnits
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);
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} else {
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area -= returnGeoCArea(xs, ys);
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}
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} else {
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if( proj.isProjected() ) {
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area += returnCoordsArea(
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xs,
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ys,
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new Point2D.Double(xs[xs.length - 1], ys[ys.length - 1]),
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areaUnits
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);
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} else {
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area += returnGeoCArea(xs, ys);
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}
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}
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}
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return area;
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}
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public double distanceWorld(Point2D pt1, Point2D pt2, IProjection proj, int distanceUnits) {
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double dist;
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if (proj.isProjected()) {
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dist = pt1.distance(pt2);
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dist = dist * MapContext.getDistanceTrans2Meter()[distanceUnits];
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}
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else {
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GeoCalc geocalc = new GeoCalc(proj);
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dist = geocalc.distanceVincenty(pt1, pt2);
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}
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return dist;
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}
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public boolean isCCW(Double[] xs, Double[] ys) {
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CoordinateList coordList = new CoordinateList();
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for( int i = 0; i < ys.length; i++ ) {
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Coordinate coord = new Coordinate(xs[i], ys[i]);
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coordList.add(coord);
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}
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if( coordList.isEmpty() ) {
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return true;
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}
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return CGAlgorithms.isCCW(coordList.toCoordinateArray());
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}
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private double returnGeoCArea(Double[] xs, Double[] ys) {
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double[] lat = new double[xs.length];
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double[] lon = new double[xs.length];
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for( int K = 0; K < xs.length; K++ ) {
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lon[K] = xs[K] / org.gvsig.fmap.mapcontrol.tools.geo.Geo.Degree;
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lat[K] = ys[K] / org.gvsig.fmap.mapcontrol.tools.geo.Geo.Degree;
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}
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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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}
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/**
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* Calcula el ?rea.
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*
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* @param xs
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* @param ys
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* @param point
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* @param areaUnits
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*
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* @return ?rea.
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*/
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public double returnCoordsArea(Double[] xs, Double[] ys, Point2D point, int areaUnits) {
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Point2D aux = point;
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double elArea = 0.0;
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Point2D pPixel;
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Point2D p;// = new Point2D.Double();
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Point2D.Double pAnt = new Point2D.Double();
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for( int pos = 0; pos < xs.length - 1; pos++ ) {
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pPixel = new Point2D.Double(xs[pos], ys[pos]);
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p = pPixel;
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if( pos == 0 ) {
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pAnt.x = aux.getX();
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pAnt.y = aux.getY();
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}
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elArea = elArea + ((pAnt.x - p.getX()) * (pAnt.y + p.getY()));
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pAnt.setLocation(p);
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}
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elArea = elArea + ((pAnt.x - aux.getX()) * (pAnt.y + aux.getY()));
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elArea = Math.abs(elArea / 2.0);
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return (elArea / (Math.pow(MapContext.getAreaTrans2Meter()[areaUnits], 2)));
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}
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public ArrayList getXY(org.gvsig.fmap.geom.Geometry geometry) {
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ArrayList xs = new ArrayList();
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ArrayList ys = new ArrayList();
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ArrayList parts = new ArrayList();
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double[] theData = new double[6];
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//double[] aux = new double[6];
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PathIterator theIterator;
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int theType;
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int numParts = 0;
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GeometryManager geomManager = GeometryLocator.getGeometryManager();
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theIterator = geometry.getPathIterator(null, geomManager.getFlatness()); //, flatness);
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boolean isClosed = false;
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while( !theIterator.isDone() ) {
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theType = theIterator.currentSegment(theData);
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switch( theType ) {
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case PathIterator.SEG_MOVETO:
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if( numParts == 0 ) {
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xs.add(theData[0]);
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ys.add(theData[1]);
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} else {
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if( !isClosed ) {
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Double[] x = (Double[]) xs.toArray(new Double[0]);
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Double[] y = (Double[]) ys.toArray(new Double[0]);
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parts.add(new Double[][]{x,
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y});
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xs.clear();
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ys.clear();
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}
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xs.add(theData[0]);
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ys.add(theData[1]);
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}
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numParts++;
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isClosed = false;
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break;
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case PathIterator.SEG_LINETO:
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isClosed = false;
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xs.add(theData[0]);
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ys.add(theData[1]);
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break;
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case PathIterator.SEG_CLOSE:
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isClosed = true;
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xs.add(theData[0]);
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ys.add(theData[1]);
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Double[] x = (Double[]) xs.toArray(new Double[0]);
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Double[] y = (Double[]) ys.toArray(new Double[0]);
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parts.add(new Double[][]{x,
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y});
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xs.clear();
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ys.clear();
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break;
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} //end switch
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theIterator.next();
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} //end while loop
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if( !isClosed ) {
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// isClosed=true;
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xs.add(theData[0]);
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ys.add(theData[1]);
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Double[] x = (Double[]) xs.toArray(new Double[0]);
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Double[] y = (Double[]) ys.toArray(new Double[0]);
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parts.add(new Double[][]{x,
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y});
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xs.clear();
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ys.clear();
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}
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return parts;
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}
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}
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