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.cresques.cts.IProjection;

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

import org.gvsig.geoprocess.core.MapTools;

/**

 * Computes a constant size of each geometry built

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

 */

public class FieldDistance implements IDistance {

        private Feature        feature                   = null;

        private int            attributePosition         = 0;

        public FieldDistance(int attributePosition) {

                this.attributePosition = attributePosition;

        }

        public void setFeature(Feature feature) {

                this.feature = feature;

        }

        /*

         * (non-Javadoc)

         * @see org.gvsig.sextante.app.algorithm.buffer.IDistance#getBufferDistance(double, org.cresques.cts.IProjection, int, int)

         */

        public double getBufferDistance(double distance, IProjection projection,

                        int distanceUnits, int mapUnits) {

                double attr = 0D;

                Object obj = feature.get(attributePosition);

                if(obj instanceof Double)

                        attr = ((Double)obj).doubleValue();

                else if(obj instanceof Integer) 

                        attr = ((Integer)obj).doubleValue();

                else if(obj instanceof Float) 

                        attr = ((Float)obj).doubleValue();

                else return 0;

                return MapTools.getInInternalUnits(attr, projection, distanceUnits, mapUnits);

        }

}