Application: gvSIG desktop » gvSIG geoprocess

/**

 * gvSIG. Desktop Geographic Information System.

 *

 * Copyright (C) 2007-2012 gvSIG Association.

 *

 * 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.

 *

 * For any additional information, do not hesitate to contact us

 * at info AT gvsig.com, or visit our website www.gvsig.com.

 */

package org.gvsig.geoprocess.algorithm.buffer;

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;

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.geoprocess.algorithm.base.util.GeometryUtil;

import org.gvsig.geoprocess.algorithm.base.util.JTSFacade;

/**

 * 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);

    }

    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,

                getDistanceUnits(), 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 && !newGeom.isEmpty()) {

                    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.geoprocess.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);

    }

}