svn-gvsig-desktop / trunk / org.gvsig.desktop / org.gvsig.desktop.compat.cdc / org.gvsig.fmap.geometry / org.gvsig.fmap.geometry.operation / src / main / java / org / gvsig / fmap / geom / operation / isCCW / IsCCW.java @ 40767
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/**
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* gvSIG. Desktop Geographic Information System.
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*
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* Copyright (C) 2007-2013 gvSIG Association.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 3
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*
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* For any additional information, do not hesitate to contact us
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* at info AT gvsig.com, or visit our website www.gvsig.com.
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*/
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package org.gvsig.fmap.geom.operation.isCCW; |
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import java.awt.geom.PathIterator; |
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import org.gvsig.fmap.geom.Geometry; |
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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.geom.operation.GeometryOperation; |
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import org.gvsig.fmap.geom.operation.GeometryOperationContext; |
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import org.gvsig.fmap.geom.operation.GeometryOperationException; |
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import org.gvsig.fmap.geom.primitive.GeneralPathX; |
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import org.gvsig.fmap.geom.util.Converter; |
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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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/**
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* This class checks if the first part from the General Path of a complex geometry is CCW.
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* @return Boolean <code>true<code> if is CCW
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* @author Carlos S?nchez Peri??n <a href = "mailto:csanchez@prodevelop.es"> e-mail </a>
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*/
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public class IsCCW extends GeometryOperation{ |
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public static final String NAME = "isCCW"; |
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private static GeometryManager geomManager = GeometryLocator.getGeometryManager(); |
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public static final int CODE = geomManager.getGeometryOperationCode(NAME); |
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private GeneralPathX generalPathX = null; |
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public int getOperationIndex() { |
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return CODE;
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} |
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public Object invoke(Geometry geom, GeometryOperationContext ctx) throws GeometryOperationException { |
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generalPathX = geom.getGeneralPath(); |
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if(generalPathX == null){ |
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//if there isn't path the operation hasn't sense.
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return null; |
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} |
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PathIterator theIterator = generalPathX.getPathIterator(null, geomManager.getFlatness()); //polyLine.getPathIterator(null, flatness); |
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double[] theData = new double[6]; |
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Coordinate first = null;
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CoordinateList coordList = new CoordinateList();
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Coordinate c1; |
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boolean bFirst = true; |
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while (!theIterator.isDone()) {
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//while not done
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int type = theIterator.currentSegment(theData);
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switch (type)
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{ |
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case GeneralPathX.SEG_MOVETO:
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c1= new Coordinate(theData[0], theData[1]); |
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if (bFirst == false) // Ya tenemos la primera parte. |
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break;
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if (bFirst)
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{ |
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bFirst=false;
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first = c1; |
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} |
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coordList.add(c1, true);
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break;
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case GeneralPathX.SEG_LINETO:
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c1= new Coordinate(theData[0], theData[1]); |
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coordList.add(c1, true);
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break;
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} |
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theIterator.next(); |
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} |
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coordList.add(first, true);
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return new Boolean(CGAlgorithms.isCCW(coordList.toCoordinateArray())); |
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} |
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} |