| gvSIG desktop 1

/*

 * Created on 20-sep-2005

 *

 * To change the template for this generated file go to

 * Window>Preferences>Java>Code Generation>Code and Comments

 */

/* 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;

import java.util.ArrayList;

import org.cresques.px.Extent;

/**

 * Clase para almacenar los extents que se van seleccionando al manipular

 * una imagen para su georreferenciaci?n. Esto permite recuperar extents anteriores.

 * 

 * @author Nacho Brodin (brodin_ign@gva.es)

 */

public class StackZoom{

        private ArrayList extentList = new ArrayList();

        private Extent initExtent = null;

        private int selectElem = -1;

        public StackZoom(){}

        /**

         * A?ade un extent a la lista

         * @param ext

         */

        public void setZoom(Extent ext){

                extentList.add(ext);

                selectElem ++;

        }

        /**

         * Recupera el ?ltimo extent aplicado

         * @return

         */

        public Extent getLastZoom(){

                if(extentList.size() == 0)

                        return null;

                if((selectElem - 1)== -1){

                        selectElem = -1;

                        extentList.clear();

                        return null;

                }

                selectElem --;

                Extent ex = (Extent)extentList.get(selectElem);

                return ex;

        }

        /**

         * Recupera el siguiente zoom. Se usa cuando se ha recuperado el ?ltimo

         * zoom y se quiere volver al siguiente.

         * @return

         */

        public Extent getNextZoom(){

                if(selectElem == (extentList.size() - 1) || extentList.size() == 0)

                        return null;

                selectElem ++;

                Extent ex = (Extent)extentList.get(selectElem);

                return ex;

        }

        /**

         * @return Returns the initExtent.

         */

        public Extent getInitExtent() {

                return initExtent;

        }

        /**

         * @param initExtent The initExtent to set.

         */

        public void setInitExtent(Extent initExtent) {

                this.initExtent = initExtent;

        }

}