Application: gvSIG desktop » gvSIG geoprocess

/*

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

 *

 * Copyright (C) 2010 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.

 *

 */

package org.gvsig.sextante.app.algorithm.buffer;

import org.gvsig.fmap.dal.exception.DataException;

import org.gvsig.fmap.dal.feature.EditableFeature;

import org.gvsig.fmap.dal.feature.Feature;

import org.gvsig.fmap.geom.exception.CreateGeometryException;

import org.gvsig.sextante.app.algorithm.base.util.GeometryUtil;

import org.gvsig.sextante.app.algorithm.base.util.JTSFacade;

import org.gvsig.sextante.app.extension.core.MapTools;

import com.vividsolutions.jts.geom.Geometry;

import com.vividsolutions.jts.operation.buffer.BufferOp;

import com.vividsolutions.jts.operation.buffer.BufferParameters;

import com.vividsolutions.jts.simplify.TopologyPreservingSimplifier;

import es.unex.sextante.core.Sextante;

import es.unex.sextante.dataObjects.IVectorLayer;

/**

 * Buffer operation

 * @author <a href="mailto:nachobrodin@gmail.com">Nacho Brodin</a>

 */

public class OutBufferOperation extends BufferOperation {

        /**

         * Builds an instance of this operation.

         * @param distance

         * @param layer

         * @param userDistance

         */

        public OutBufferOperation(IDistance distance, IVectorLayer layer, double userDistance) {

                super(distance, layer, userDistance);

        }

        /*

         * (non-Javadoc)

         * @see org.gvsig.sextante.app.algorithm.base.core.GeometryOperation#invoke(org.gvsig.fmap.geom.Geometry, org.gvsig.fmap.dal.feature.Feature)

         */

        public EditableFeature invoke(org.gvsig.fmap.geom.Geometry g, Feature feature) {

                Geometry newGeom = null;

                Geometry previousExteriorRing = null;

                Geometry originalGeometry = GeometryUtil.geomToJTS(g);

                Geometry inputParam = originalGeometry;

                distance.setFeature(feature);

                double bufferDistance = distance.getBufferDistance(userDistance, projection, MapTools.getDistanceUnits(), MapTools.getMapUnits());

                if(originalGeometry.getDimension() != 0)

                        inputParam = TopologyPreservingSimplifier.simplify(originalGeometry, bufferDistance / 10d);

                for(int i = 1; i <= numberOfRadialBuffers; i++) {

                        double distRing = i * bufferDistance;

                        BufferOp bufOp = new BufferOp(inputParam);

                        bufOp.setEndCapStyle(capBuffer == CAP_ROUND ? BufferParameters.CAP_ROUND : BufferParameters.CAP_SQUARE);

                        Geometry newGeometry = bufOp.getResultGeometry(distRing);

                        if(previousExteriorRing != null) 

                                newGeom = JTSFacade.difference(newGeometry, previousExteriorRing);

                        else

                                newGeom = newGeometry;

                        try {

                                if(newGeom != null) {

                                        lastEditFeature = persister.addFeature(newGeom, id, distRing);

                                        id ++;

                                        previousExteriorRing = newGeom;

                                }

                        } catch (CreateGeometryException e) {

                                Sextante.addErrorToLog(e);

                        } catch (DataException e) {

                                Sextante.addErrorToLog(e);

                        }

                }

                return lastEditFeature;

        }

        /*

         * (non-Javadoc)

         * @see org.gvsig.sextante.app.algorithm.base.core.GeometryOperation#invoke(org.gvsig.fmap.geom.Geometry, org.gvsig.fmap.dal.feature.EditableFeature)

         */

        public void invoke(org.gvsig.fmap.geom.Geometry g, EditableFeature feature) {

                invoke(g, (Feature)feature);

        }

}