Application: gvSIG desktop

/*

 * Cresques Mapping Suite. Graphic Library for constructing mapping applications.

 * 

 * Copyright (C) 2004-5. 

 *

 * 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:

 * 

 * cresques@gmail.com

 */

package org.cresques.io.raster;

import java.awt.Image;

/**

 * Calcula el m?ximo y el m?nimo de un raster, As? como el segundo menor valor y 

 * el segundo mayor valor.

 * @author Luis W. Sevilla (sevilla_lui@gva.es)

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

 */

public abstract class ComputeMinMaxFilter extends RasterFilter {

        protected int [] min = {Integer.MAX_VALUE,Integer.MAX_VALUE,Integer.MAX_VALUE};

        protected int [] max = {Integer.MIN_VALUE,Integer.MIN_VALUE,Integer.MIN_VALUE};

        protected int [] secondMin = {Integer.MAX_VALUE,Integer.MAX_VALUE,Integer.MAX_VALUE};

        protected int [] secondMax = {Integer.MIN_VALUE,Integer.MIN_VALUE,Integer.MIN_VALUE};

        protected int [] tmpMin = {Integer.MAX_VALUE,Integer.MAX_VALUE,Integer.MAX_VALUE};

        protected int [] tmpMax = {Integer.MIN_VALUE,Integer.MIN_VALUE,Integer.MIN_VALUE};

        /**

         * Constructor

         *

         */

        public ComputeMinMaxFilter(){

                super();

        }

        /**

         * Operaciones que se realizan antes de la ejecuci?n del filtro

         */

        public void pre(){

                //Obtenci?n de par?metros comunes a todos

                this.stats = (RasterStats)params.get("stats");

                this.stats.tailPercent = 0D;

                //Operaciones del filtro concreto

                this.min = new int[stats.minBandValue.length];

                this.max = new int[stats.maxBandValue.length];

                this.secondMin = new int[stats.minBandValue.length];

                this.secondMax = new int[stats.maxBandValue.length];

                this.tmpMin = new int[stats.minBandValue.length];

                this.tmpMax = new int[stats.maxBandValue.length];

                for (int i=0; i<min.length; i++) {

                        secondMin[i] = tmpMin[i] = min[i] = Integer.MAX_VALUE;

                        secondMax[i] = tmpMax[i] = max[i] = Integer.MIN_VALUE;

                }        

        }

        /**

         * Operaciones que se realizan despu?s de la ejecuci?n del filtro

         */

        public void post(){

                for (int i=0; i<3; i++) {

                        stats.minBandValue[i] = min[i];

                        stats.maxBandValue[i] = max[i];

                        stats.secondMinBandValue[i] = secondMin[i];

                        stats.secondMaxBandValue[i] = secondMax[i];

                }

        }

        /**

         * Obtiene le m?nimo para una banda dada

         * @param bandNr        banda

         * @return        valor m?nimo

         */

        public int getMin(int bandNr) { 

                return min[bandNr]; 

        }

        /**

         * Obtiene el m?ximo para una banda dada

         * @param bandNr        banda

         * @return        valor m?ximo

         */

        public int getMax(int bandNr) { 

                return max[bandNr]; 

        }

        /**

         * Obtiene el objeto stats con el calculo de m?ximos y m?nimos

         */

        public Object getResult(String name){

                if(name.equals("stats"))

                        return stats;

                else return null;

        }

}