| gvSIG desktop 1

/*

 * Created on 02-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: ConstantDistanceBufferVisitor.java 12947 2007-08-07 15:09:22Z azabala $

* $Log$

* Revision 1.6  2007-08-07 15:09:22  azabala

* changes to remove UnitUtils' andami dependencies

*

* Revision 1.5  2007/03/06 16:47:58  caballero

* Exceptions

*

* Revision 1.4  2006/09/15 10:42:54  caballero

* extensibilidad de documentos

*

* Revision 1.3  2006/08/29 07:21:09  cesar

* Rename com.iver.cit.gvsig.fmap.Fmap class to com.iver.cit.gvsig.fmap.MapContext

*

* Revision 1.2  2006/06/29 17:31:47  azabala

* Uses UnitUtils

*

* Revision 1.1  2006/06/20 18:20:45  azabala

* first version in cvs

*

* Revision 1.2  2006/06/02 18:20:33  azabala

* limpieza de imports

*

* Revision 1.1  2006/05/24 21:14:41  azabala

* primera version en cvs despues de refactoring orientado a crear un framework extensible de geoprocessing

*

* Revision 1.8  2006/05/01 19:18:09  azabala

* revisi?n general del buffer (a?adidos anillos concentricos, buffers interiores y exteriores, etc)

*

* Revision 1.7  2006/03/28 16:27:16  azabala

* *** empty log message ***

*

* Revision 1.6  2006/03/07 21:01:33  azabala

* *** empty log message ***

*

* Revision 1.5  2006/03/06 19:48:39  azabala

* *** empty log message ***

*

* Revision 1.3  2006/03/05 19:57:05  azabala

* *** empty log message ***

*

* Revision 1.2  2006/02/20 19:44:21  azabala

* *** empty log message ***

*

* Revision 1.1  2006/02/17 16:31:38  azabala

* *** empty log message ***

*

* Revision 1.3  2006/02/12 21:02:58  azabala

* *** empty log message ***

*

* Revision 1.2  2006/02/09 16:01:06  azabala

* First version in CVS

*

* Revision 1.1  2006/02/02 19:46:51  azabala

* First version in CVS

*

*

*/

package com.iver.cit.gvsig.geoprocess.impl.buffer.fmap;

import com.iver.cit.gvsig.exceptions.visitors.StartVisitorException;

import com.iver.cit.gvsig.exceptions.visitors.VisitorException;

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

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

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

import com.iver.cit.gvsig.geoprocess.core.fmap.GeoprocessException;

import com.iver.cit.gvsig.geoprocess.core.util.UnitUtils;

import org.cresques.cts.IProjection;

/**

 * This FeatureVisitor computes buffers and saves

 * it to a new FLayer.

 * All IFeature of this Layer will have the same buffer

 * distance.

 *

 * @author azabala

 *

 */

public class ConstantDistanceBufferVisitor extends BufferVisitor {

        /**

         * buffer distance to use

         */

        private double distance;

        /**

         * View projection (allow to convert, if needed, coordinates when working

         * with not projected (geographics) CRS's)

         */

        private IProjection projection;

        private int distanceUnits;

        private int mapUnits;

        /**

         * Constructor

         * @param distance buffer distance to use

         * @param viewProj TODO

         * @param mapUnits 

         * @param distanceUnits 

         * @throws GeoprocessException

         */

        public ConstantDistanceBufferVisitor(double distance, IProjection viewProj, int distanceUnits, int mapUnits) throws GeoprocessException{

                this.distance = distance;

                this.projection = viewProj;

                this.distanceUnits = distanceUnits;

                this.mapUnits = mapUnits;

        }

        public void stop(FLayer layer) throws VisitorException {

                //we must flush JTS processors

                resultsProcessor.finish();

        }

        /**

         * This FeatureVisitor only work with Vectorial

         * Layers

         */

        public boolean start(FLayer layer) throws StartVisitorException {

                if(layer instanceof FLyrVect){

                        return true;

                }else

                        return false;

        }

        public double getBufferDistance(IGeometry g, int index) {

                //first: pass the user entry to internal units

                return UnitUtils.getInInternalUnits(distance, projection, distanceUnits, mapUnits);

        }

        public String getProcessDescription() {

                return "Computing buffers with constant distances";

        }

}