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;

/**

 * Clase base para los filtros de transparencia en sus diferentes tipos

 * de datos.

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

 * 

 */ 

public abstract class TransparencyFilter extends RasterFilter{

        //Par?metros del filtro

        protected int[][] rangesR;

        protected int[][] rangesG;

        protected int[][] rangesB;

        /**

         * Valor de transparencia

         */

        public int                 alpha = 0x10;

        /**

         * Color en la banda del rojo para la transparencia

         */

        public int                 transparencyColorRed = 0xff;

        /**

         * Color en la banda del verde para la transparencia

         */

        public int                 transparencyColorGreen = 0xff;

        /**

         * Color en la banda del azul para la transparencia

         */

        public int                 transparencyColorBlue = 0xff;

        /**

         * Constructor

         *

         */

        public TransparencyFilter(){

                super();

        }

        /**

         * Obtiene par?metros del filtro desde la tabla Hash

         */

        public void pre(){

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

                this.rangesR = (int[][])params.get("red");

                this.rangesG = (int[][])params.get("green");

                this.rangesB = (int[][])params.get("blue");

                this.alpha = ((Integer)params.get("alpha")).intValue();

                this.transparencyColorRed = ((Integer)params.get("transparencyRed")).intValue();

                this.transparencyColorGreen = ((Integer)params.get("transparencyGreen")).intValue();

                this.transparencyColorBlue = ((Integer)params.get("transparencyBlue")).intValue();

        }

        /**

         * Para dos intervalos dados, devuelve true si el intervalo B est? dentro del A y

         * false si no lo est?

         * @param intervalA intervalo A

         * @param intervalB intervalo B

         * @return true si el intervalo B est? dentro del A y false si no lo est?

         */

        private boolean compareIntervals(int[][] intervalA, int[][] intervalB){

                if(intervalA != null && intervalB != null){

                        boolean equalInterval = false;

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

                                for(int j=0;j<intervalA.length;j++){

                                        if(        intervalB[i][0] >= intervalA[i][0] && 

                                                intervalB[i][1] <= intervalA[i][1]){

                                                equalInterval = true;

                                                break;

                                        }

                                }

                                if(!equalInterval)

                                        return false;

                        }

                        return true;

                }

                if(intervalA == null && intervalB == null)

                        return true;

                return false;

        }

        /**

         * Devuelve true si el filtro pasado por par?metro es equivalente a este

         * y false si no lo es.

         * @param filter        Filtro a comparar

         * @return        true si son equivalentes y false si no lo son

         */

        public boolean isEquivalent(TransparencyFilter filter){

                if(        alpha!=filter.alpha ||

                        transparencyColorRed != filter.transparencyColorRed ||

                        transparencyColorGreen != filter.transparencyColorGreen ||

                        transparencyColorBlue != filter.transparencyColorBlue)

                        return false;

                boolean equalRange = false;

                equalRange = compareIntervals((int[][])params.get("red"), (int[][])filter.params.get("red"));

                if(!equalRange)

                        return false;

                equalRange = false;

                equalRange = compareIntervals((int[][])params.get("green"), (int[][])filter.params.get("green"));

                if(!equalRange)

                        return false;

                equalRange = false;

                equalRange = compareIntervals((int[][])params.get("blue"), (int[][])filter.params.get("blue"));

                if(!equalRange)

                        return false;

                return true;                

        }

        /**

         * Obtiene los rangos de transparencia en la banda  del rojo 

         * @return rangos de transparencia en la banda del rojo

         */

        public int[][] getRangeR(){

                return this.rangesR;

        }

        /**

         * Obtiene los rangos de transparencia en la banda  del verde

         * @return rangos de transparencia en la banda del verde

         */

        public int[][] getRangeG(){

                return this.rangesG;

        }

        /**

         * Obtiene los rangos de transparencia en la banda  del azul

         * @return rangos de transparencia en la banda del azul

         */

        public int[][] getRangeB(){

                return this.rangesB;

        }

}