Application: gvSIG desktop » gvSIG projections

/*

 * 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.px;

import java.awt.geom.Point2D;

import java.awt.geom.Rectangle2D;

import java.text.DecimalFormat;

/**

 *        Clase que getiona el extent de una imagen

 *        

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

 */

public class Extent {

    Point2D min = null;

    Point2D max = null;

    /**

     * Constructor sin par?metros

     */

    public Extent() {

        min = new Point2D.Double(999999999.0, 999999999.0);

        max = new Point2D.Double(-999999999.0, -999999999.0);

    }

    /**

     * Constructor 

     * @param pt1        punto que representa la esquina superior izquierda

     * @param pt2        punto que representa la esquina inferior derecha

     */

    public Extent(Point2D pt1, Point2D pt2) {

        newExtent(pt1.getX(), pt1.getY(), pt2.getX(), pt2.getY());

    }

    /**

     * Contructor

     * @param x1 punto que representa la coordenada X de la esquina superior izquierda

     * @param y1 punto que representa la coordenada Y de la esquina superior izquierda

     * @param x2 punto que representa la coordenada X de la esquina inferior derecha

     * @param y2 punto que representa la coordenada Y de la esquina inferior derecha

     */

    public Extent(double x1, double y1, double x2, double y2) {

        newExtent(x1, y1, x2, y2);

    }

    /**

     * Constructor

     * @param r        Rectangulo 2D

     */

    public Extent(Rectangle2D r) {

        newExtent(r.getX(), r.getY(), r.getX() + r.getWidth(),

                  r.getY() + r.getHeight());

    }

    /**

     * Constructor de copia

     * @param ext        Objeto Extent

     */

    public Extent(Extent ext) {

        newExtent(ext.minX(), ext.minY(), ext.maxX(), ext.maxY());

    }

    /**

     * Crea un objeto extent identico y lo retorna

     * @return Objeto extent

     */

    public Object clone() {

        Extent e = (Extent) clone();

        e.min = (Point2D) min.clone();

        e.max = (Point2D) max.clone();

        return e;

    }

    private void newExtent(double x1, double y1, double x2, double y2) {

        min = new Point2D.Double(Math.min(x1, x2), Math.min(y1, y2));

        max = new Point2D.Double(Math.max(x1, x2), Math.max(y1, y2));

    }

    /**

     * Obtiene la coordenada X m?nima

     * @return valor de la coordenada X m?nima

     */

    public double minX() {

        return min.getX();

    }

    /**

     * Obtiene la coordenada Y m?nima

     * @return valor de la coordenada X m?nima

     */

    public double minY() {

        return min.getY();

    }

    /**

     * Obtiene la coordenada X m?xima

     * @return valor de la coordenada X m?xima

     */

    public double maxX() {

        return max.getX();

    }

    /**

     * Obtiene la coordenada Y m?xima

     * @return valor de la coordenada Y m?xima

     */

    public double maxY() {

        return max.getY();

    }

    /**

     * Obtiene el punto m?nimo

     * @return m?nimo

     */

    public Point2D getMin() {

        return min;

    }

    /**

     * Obtiene el punto m?ximo

     * @return m?ximo

     */

    public Point2D getMax() {

        return max;

    }

    public boolean isAt(Point2D pt) {

        if (pt.getX() < minX()) {

            return false;

        }

        if (pt.getX() > maxX()) {

            return false;

        }

        if (pt.getY() < minY()) {

            return false;

        }

        if (pt.getY() > maxY()) {

            return false;

        }

        return true;

    }

    public double width() {

        return Math.abs(maxX() - minX());

    }

    public double height() {

        return Math.abs(maxY() - minY());

    }

    /**

     * Verifica un punto, y modifica el extent si no est? incluido

     */

    public void add(Point2D pt) {

        if (pt == null) {

            return;

        }

        min.setLocation(Math.min(pt.getX(), minX()), Math.min(pt.getY(), minY()));

        max.setLocation(Math.max(pt.getX(), maxX()), Math.max(pt.getY(), maxY()));

    }

    public void add(Extent ext) {

        if (ext == null) {

            return;

        }

        min.setLocation(Math.min(ext.minX(), minX()),

                        Math.min(ext.minY(), minY()));

        max.setLocation(Math.max(ext.maxX(), maxX()),

                        Math.max(ext.maxY(), maxY()));

    }

    /**

     * Obtiene la escala

     * @param width        Ancho

     * @param height        Alto

     * @return

     */

    public double[] getScale(int width, int height) {

        return getScale((double) width, (double) height);

    }

    public double[] getScale(double width, double height) {

        double[] scale = new double[2];

        scale[0] = ((float) width) / width();

        scale[1] = ((float) height) / height();

        return scale;

    }

    public Rectangle2D toRectangle2D() {

        return new Rectangle2D.Double(minX(), minY(), width(), height());

    }

    public String toString() {

        DecimalFormat format = new DecimalFormat("####.000");

        return "Extent: (" + format.format(minX()) + "," +

               format.format(minY()) + "), (" + format.format(maxX()) + "," +

               format.format(maxY()) + ")";

    }

    public interface Has {

        public Extent getExtent();

    }

}