| gvSIG desktop 1

/*

 * Created on 16-feb-2006

 *

 * gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana

 *

 * Copyright (C) 2004 IVER T.I. and Generalitat Valenciana.

 *

 * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307,USA.

 *

 * For more information, contact:

 *

 *  Generalitat Valenciana

 *   Conselleria d'Infraestructures i Transport

 *   Av. Blasco Ib??ez, 50

 *   46010 VALENCIA

 *   SPAIN

 *

 *      +34 963862235

 *   gvsig@gva.es

 *      www.gvsig.gva.es

 *

 *    or

 *

 *   IVER T.I. S.A

 *   Salamanca 50

 *   46005 Valencia

 *   Spain

 *

 *   +34 963163400

 *   dac@iver.es

 */

/* CVS MESSAGES:

*

* $Id: ScalableConvexHullVisitor.java 4447 2006-03-15 18:35:56Z azabala $

* $Log$

* Revision 1.3  2006-03-15 18:31:06  azabala

* *** empty log message ***

*

* Revision 1.2  2006/03/07 21:01:33  azabala

* *** empty log message ***

*

* Revision 1.1  2006/03/06 19:48:39  azabala

* *** empty log message ***

*

* Revision 1.2  2006/03/05 19:57:48  azabala

* *** empty log message ***

*

* Revision 1.1  2006/02/17 16:32:50  azabala

* *** empty log message ***

*

*

*/

package com.iver.gvsig.geoprocessing.impl.convexhull;

import com.iver.cit.gvsig.fmap.core.IGeometry;

import com.iver.cit.gvsig.fmap.core.v02.FConverter;

import com.iver.cit.gvsig.fmap.layers.FLayer;

import com.iver.cit.gvsig.fmap.layers.layerOperations.VectorialData;

import com.iver.cit.gvsig.fmap.operations.strategies.VisitException;

import com.vividsolutions.jts.geom.Geometry;

import com.vividsolutions.jts.geom.GeometryCollection;

import com.vividsolutions.jts.geom.GeometryFactory;

public class ScalableConvexHullVisitor implements ConvexHullVisitor {

        Geometry geometry;

        GeometryFactory geomFact;

        public ScalableConvexHullVisitor(){

                geomFact = new GeometryFactory();

        }

        /**

         * Returns FMap convex hull geometry.

         * @return

         */

        public IGeometry getConvexHull(){

                return FConverter.jts_to_igeometry(geometry);

        }

        public Geometry getJtsConvexHull(){

                return geometry;

        }

        public void visit(IGeometry g, int index) throws VisitException {

                Geometry actualGeometry = g.toJTSGeometry();

                if(geometry == null){

                        geometry = actualGeometry;

                }else{

                        Geometry[] geoms = new Geometry[2];

                        geoms[0] = geometry;

                        geoms[1] = actualGeometry;

                        GeometryCollection gc = geomFact.

                                createGeometryCollection(geoms);

                        geometry = gc.convexHull();        

                }

        }

        public void stop(FLayer layer) {

        }

        public boolean start(FLayer layer) {

                return layer instanceof VectorialData;

        }

        public String getProcessDescription() {

                return "Computing convex hull in an scalable manner";

        }

}