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.Dimension;

import java.awt.Graphics2D;

import java.awt.geom.Point2D;

import java.awt.geom.Rectangle2D;

import java.awt.image.BufferedImage;

import org.gvsig.rastertools.georeferencing.view.BaseZoomView;

import com.iver.cit.gvsig.fmap.MapControl;

import com.iver.cit.gvsig.fmap.ViewPort;

import com.iver.cit.gvsig.fmap.layers.FLayers;

import com.iver.utiles.swing.threads.Cancellable;

/**

 * Gestor de peticiones de zoom sobre el panel con el raster a georreferenciar.

 * Implementa el interfaz IExtensionRequest para que este comunique la peticiones

 * de zoom y ViewRasterRequestManager pueda hacer las peticiones de datos a la capa.

 * 

 * 30/12/2007

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

 */

public class ViewMapRequestManager implements IExtensionRequest {

        private FLayers          lyrs          = null;

        private BaseZoomView     view          = null;

        private MapControl       mapControl    = null;

        /**

         * Asigna la capa a georreferenciar de donde se obtienen los datos.

         * @param lyr

         */

        public ViewMapRequestManager(BaseZoomView view, MapControl mapControl) {

                this.mapControl = mapControl;

                this.lyrs = mapControl.getMapContext().getLayers();

                this.view = view;

        }

        /**

         * Calcula la extensi?n que contendr? la vista a partir del extent

         * m?ximo de la capa/s que contienen . Tienen en cuenta las distintan proporciones

         * entre vista y petici?n

         * @param Rectangle2D

         */

        public Rectangle2D initRequest(Rectangle2D extent) throws InvalidRequestException {

                double x = extent.getX();

                double y = extent.getY();

                double w = extent.getWidth();

                double h = extent.getHeight();

                //Calculamos la extensi?n de la vista para el extent m?ximo que va a contener

                //teniendo en cuenta las proporciones de ambos.

                if(extent.getWidth() < extent.getHeight()) {

                        if(((double)view.getCanvasWidth() / (double)view.getCanvasHeight()) <= (extent.getWidth() / extent.getHeight())) {

                                h = (view.getCanvasHeight() * w) / view.getCanvasWidth();

                                y = extent.getCenterY() - (h / 2);

                        } else { //p1 < p2

                                w = (view.getCanvasWidth() * h) / view.getCanvasHeight();

                                x = extent.getCenterX() - (w / 2);

                        }

                } else {

                        if(((double)view.getCanvasWidth() / (double)view.getCanvasHeight()) >= (extent.getWidth() / extent.getHeight())) {

                                w = (view.getCanvasWidth() * h) / view.getCanvasHeight();

                                x = extent.getCenterX() - (w / 2);

                        } else { //p1 < p2

                                h = (view.getCanvasHeight() * w) / view.getCanvasWidth();

                                y = extent.getCenterY() - (h / 2);

                        }

                }

                Rectangle2D r = new Rectangle2D.Double(x, y, w, h);

                setDrawParams(null, r);

                request(r);

                return r;

        }

        /*

         * (non-Javadoc)

         * @see org.gvsig.rastertools.georeferencing.ui.zoom.IExtensionRequest#request(java.awt.geom.Rectangle2D)

         */

        public Rectangle2D request(Rectangle2D extent) throws InvalidRequestException {

                if(extent == null)

                        return lyrs.getFullExtent();

                //Obtenemos el viewport y calculamos la matriz de transformaci?n

                ViewPort vp = new ViewPort(null);

                vp.setImageSize(new Dimension(view.getCanvasWidth(), view.getCanvasHeight()));

                vp.setExtent(extent);

                try {

                        //Dibujamos a trav?s del render de la capa en un graphics como el de la vista

                        BufferedImage initImg = new BufferedImage(view.getCanvasWidth(), view.getCanvasHeight(), BufferedImage.TYPE_INT_RGB);

                        lyrs.draw(initImg, (Graphics2D)initImg.getGraphics(), vp, new CancellableClass(), mapControl.getMapContext().getScaleView());

                        setDrawParams(initImg, extent);

                } catch (Exception e) {

                        throw new InvalidRequestException("Error en al acceso al fichero");

                }

                return extent;

        }

        /*

         * (non-Javadoc)

         * @see org.gvsig.rastertools.georeferencing.ui.zoom.IExtensionRequest#fullExtent(java.awt.Dimension)

         */

        public void fullExtent() throws InvalidRequestException  {

                this.initRequest(lyrs.getFullExtent());

        }

        /**

         * Asigna los par?metros para el control de zoom del mapa

         * @param img BufferedImage

         * @param vp ViewPort

         */

        public void setDrawParams(BufferedImage img, Rectangle2D extBuf) {

                if(view != null && lyrs != null) {

                        if(img != null)

                                view.setDrawParams(img, extBuf, extBuf.getWidth()/img.getWidth(), new Point2D.Double(extBuf.getCenterX(), extBuf.getCenterY()));

                        else

                                view.setDrawParams(img, extBuf, extBuf.getWidth()/view.getCanvasWidth(), new Point2D.Double(extBuf.getCenterX(), extBuf.getCenterY()));

                }

        }

        class CancellableClass implements Cancellable{

            private boolean cancel = false;

                   public void setCanceled(boolean canceled) {

                           this.cancel = canceled;

                   }

                public boolean isCanceled() {

                        return this.cancel;

                }

           }

}