Application: gvSIG desktop

/* gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana

 *

 * Copyright (C) 2007 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.

 */

package org.gvsig.rastertools.georeferencing.ui.zoom;

import java.awt.Color;

import java.awt.Graphics;

import java.awt.event.MouseEvent;

import java.awt.event.MouseListener;

import java.awt.event.MouseMotionListener;

import java.awt.geom.Point2D;

import java.awt.geom.Rectangle2D;

/**

 * Herramienta de selecci?n de zoom sobre la vista.

 * 

 * 17/01/2008

 * @author Nacho Brodin (nachobrodin@gmail.com)

 */

public class ZoomRectangleTool extends BaseViewTool implements MouseListener, MouseMotionListener {

    private Point2D                  initPoint = null;

    private double                   x = 0, y = 0, w = 0, h = 0;

    private Rectangle2D              result = null;

        /**

         * Constructor. Asigna el canvas e inicializa los listeners.

         * @param canvas

         */

        public ZoomRectangleTool(CanvasZone canvas, ToolListener listener) {

                super(canvas, listener);

                canvas.addMouseListener(this);

                canvas.addMouseMotionListener(this);

        }

        /*

         * (non-Javadoc)

         * @see org.gvsig.rastertools.georeferencing.ui.zoom.IViewTool#draw(java.awt.image.BufferedImage, java.awt.geom.Rectangle2D)

         */

        public void draw(Graphics g) {

                if(initPoint == null || w == 0 || h == 0)

                        return;

                g.setColor(Color.RED);

                g.drawRect((int)x, (int)y, (int)w, (int)h);

        }

        /*

         * (non-Javadoc)

         * @see org.gvsig.rastertools.georeferencing.ui.zoom.IViewTool#getResult()

         */

        public Object getResult() {

                return result;

        }

        /**

         * Selecciona el punto inicial del cuadro del que se quiere el zoom

         */

        public void mousePressed(MouseEvent e) {

                if(selectArea) {

                        initPoint = e.getPoint();

                        result = null;

                }

        }

        /**

         * Dibujado del cuadro con el ?rea a hacer zoom.

         */

        public void mouseDragged(MouseEvent e) {

                if(selectArea) {

                        x = initPoint.getX();

                        y = initPoint.getY();

                        w = Math.abs(e.getX() - x);

                        h = Math.abs(e.getY() - y);

                        if(e.getX() < x) 

                                x = e.getX();

                        if(e.getY() < y) 

                                y = e.getY();

                        Graphics g1 = canvas.getGraphics();

                        g1.setColor(Color.RED);

                        g1.drawRect((int)x,(int)y, (int)w, (int)h);

                }

        }

        /*

         * (non-Javadoc)

         * @see java.awt.event.MouseListener#mouseReleased(java.awt.event.MouseEvent)

         */

        public void mouseReleased(MouseEvent e) {

                if(selectArea) {

                        //Ajuste de la petici?n a la proporci?n del canvas. Esto se hace porque la relaci?n entre

                        //el ancho y alto del canvas es distinta a la del cuadro que hemos pintado en pantalla.

                        double centerX = x + (w / 2);

                        double centerY = y + (h / 2);

                        if(w >= h) { //La X y la W no varian

                                h = (canvas.getHeight() * w) / canvas.getWidth();

                                y = centerY - (h / 2);

                        } else { //La Y y la H no varian

                                w = (canvas.getWidth() * h) / canvas.getHeight();

                                x = centerX - (w / 2);

                        }

                        Point2D pInit = canvas.viewCoordsToWorld(new Point2D.Double(x, y));

                        Point2D pEnd = canvas.viewCoordsToWorld(new Point2D.Double(x + w, y + h));

                        result = new Rectangle2D.Double(pInit.getX(), pEnd.getY(), Math.abs(pInit.getX() - pEnd.getX()), Math.abs(pInit.getY() - pEnd.getY()));

                        initPoint = null;

                        x = y = w = h = 0;

                        listener.endAction(new ToolEvent(this));

                }

        }

        public void mouseClicked(MouseEvent e) {

        }

        public void mouseEntered(MouseEvent e) {

        }

        public void mouseExited(MouseEvent e) {

        }

        public void mouseMoved(MouseEvent e) {

        }

}