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.geoprocess.algorithm.buffer;

import org.cresques.cts.IProjection;

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

/**

 * Computes a constant size of each geometry built

 * 

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

 */

public class FieldDistance extends AbstractDistance {

    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.geoprocess.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 getInInternalUnits(attr, projection, distanceUnits, mapUnits);

    }

}