| gvSIG desktop 1

/* gvSIG. Geographic Information System of the Valencian Government

*

* Copyright (C) 2007-2008 Infrastructures and Transports Department

* of the Valencian Government (CIT)

* 

* This program is free software; you can redistribute it and/or

* modify it under the terms of the GNU General Public License

* as published by the Free Software Foundation; either version 2

* of the License, or (at your option) any later version.

* 

* This program is distributed in the hope that it will be useful,

* but WITHOUT ANY WARRANTY; without even the implied warranty of

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

* GNU General Public License for more details.

* 

* You should have received a copy of the GNU General Public License

* along with this program; if not, write to the Free Software

* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, 

* MA  02110-1301, USA.

* 

*/

/*

* AUTHORS (In addition to CIT):

* 2008 PRODEVELOP S.L. Main Development

*/

/**

 * 

 */

package org.gvsig.fmap.geom.operation.isCCW;

import java.awt.geom.PathIterator;

import org.gvsig.fmap.geom.Geometry;

import org.gvsig.fmap.geom.GeometryLocator;

import org.gvsig.fmap.geom.GeometryManager;

import org.gvsig.fmap.geom.operation.GeometryOperation;

import org.gvsig.fmap.geom.operation.GeometryOperationContext;

import org.gvsig.fmap.geom.operation.GeometryOperationException;

import org.gvsig.fmap.geom.primitive.GeneralPathX;

import org.gvsig.fmap.geom.util.Converter;

import com.vividsolutions.jts.algorithm.CGAlgorithms;

import com.vividsolutions.jts.geom.Coordinate;

import com.vividsolutions.jts.geom.CoordinateList;

/**

 * This class checks if the first part from the General Path of a complex geometry is CCW.

 * @return Boolean <code>true<code> if is CCW

 * @author Carlos S?nchez Peri??n <a href = "mailto:csanchez@prodevelop.es"> e-mail </a>

 */

public class IsCCW extends GeometryOperation{

    public static final String NAME = "isCCW";

    private static GeometryManager geomManager = GeometryLocator.getGeometryManager();

    public static final int CODE = geomManager.getGeometryOperationCode(NAME);

        private GeneralPathX generalPathX = null;        

        public int getOperationIndex() {

                return CODE;

        }

        public Object invoke(Geometry geom, GeometryOperationContext ctx) throws GeometryOperationException {

                generalPathX = geom.getGeneralPath();

                if(generalPathX == null){

                        //if there isn't path the operation hasn't sense.

                        return null;

            }

                PathIterator theIterator = generalPathX.getPathIterator(null, geomManager.getFlatness()); //polyLine.getPathIterator(null, flatness);

                double[] theData = new double[6];

        Coordinate first = null;

        CoordinateList coordList = new CoordinateList();

        Coordinate c1;

        boolean bFirst = true;

                while (!theIterator.isDone()) {

                        //while not done

                        int type = theIterator.currentSegment(theData);

                switch (type)

                {

                case GeneralPathX.SEG_MOVETO:

                        c1= new Coordinate(theData[0], theData[1]);

                        if (bFirst == false) // Ya tenemos la primera parte.

                                break;

                        if (bFirst)

                        {

                                bFirst=false;

                                first = c1;

                        }

                        coordList.add(c1, true);

                        break;

                case GeneralPathX.SEG_LINETO:

                        c1= new Coordinate(theData[0], theData[1]);

                        coordList.add(c1, true);

                        break;

                }

                theIterator.next();

                }

                coordList.add(first, true);

                return new Boolean(CGAlgorithms.isCCW(coordList.toCoordinateArray()));

        }

}