| gvSIG desktop 1

/* 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

 */

package com.iver.cit.gvsig.fmap.operations.strategies;

import java.awt.geom.Point2D;

import java.awt.geom.Rectangle2D;

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

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.FBitSet;

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

/**

 * Query by point Visitor.

 *

 * @author Vicente Caballero Navarro

 */

public class QueryByPointVisitor implements FeatureVisitor {

        private Point2D point = null;

        private double tolerance;

        private FLayer layer = null;

        private FBitSet bitset = null;

        private Rectangle2D recPoint = null;

        // private ICoordTrans ct = null;

        /**

         * Devuelve un FBitSet con los ?ndices de los registros de la consulta.

         *

         * @return FBitSet con los ?ndices de la consulta.

         */

        public FBitSet getBitSet() {

                return bitset;

        }

        /**

         * DOCUMENT ME!

         *

         * @param layer DOCUMENT ME!

         */

        public void setLayer(FLayer layer) {

                this.layer = layer;

                // this.ct = layer.getCoordTrans();

        }

        /**

         * Inserta la tolerancia que se aplica en la selecci?n.

         *

         * @param t tolerancia.

         */

        public void setTolerance(double t) {

                tolerance = t;

        }

        /**

         * Inserta el punto de consulta.

         *

         * @param p punto de consulta.

         */

        public void setQueriedPoint(Point2D p) {

                point = p;

        }

        /**

         * @see com.iver.cit.gvsig.fmap.operations.strategies.FeatureVisitor#visit(com.iver.cit.gvsig.fmap.core.IGeometry,

         *                 int)

         */

        public void visit(IGeometry g, int index) throws VisitorException, ProcessVisitorException {

                if (g==null)return;

                /* if (ct != null) {

                        g.reProject(ct);

                } */

                if (g.intersects(recPoint)) {

                        bitset.set(index, true);

                } else {

                        bitset.set(index, false);

                }

        }

        /**

         * @see com.iver.cit.gvsig.fmap.operations.strategies.FeatureVisitor#stop()

         */

        public void stop(FLayer layer) throws VisitorException {

        }

        /**

         * @see com.iver.cit.gvsig.fmap.operations.strategies.FeatureVisitor#start()

         */

        public boolean start(FLayer layer) throws StartVisitorException {

                bitset = new FBitSet();

                recPoint = new Rectangle2D.Double(point.getX() - (tolerance / 2),

                                point.getY() - (tolerance / 2), tolerance, tolerance);

                return true;

        }

        public String getProcessDescription() {

                return "Selecting geometries that intersects a point";

        }

}