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.fmap.raster.layers.FLyrRasterSE;

import org.gvsig.raster.dataset.InvalidSetViewException;

import org.gvsig.raster.dataset.io.RasterDriverException;

import org.gvsig.raster.datastruct.Extent;

import org.gvsig.raster.datastruct.ViewPortData;

import org.gvsig.raster.util.RasterUtilities;

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

/**

 * 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 ViewRasterRequestManager implements IExtensionRequest {

        private FLyrRasterSE     lyr = null;

        private BaseZoomView     view = null;

        /**

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

         * @param lyr

         */

        public ViewRasterRequestManager(BaseZoomView view, FLyrRasterSE lyr) {

                this.lyr = lyr;

                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, y, w, h;

                //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.getHeight() > extent.getWidth()) {

                        y = extent.getY();

                        h = extent.getHeight();

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

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

                } else {

                        x = extent.getX();

                        w = extent.getWidth();

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

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

                }

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

                view.getCanvas().setCanvasExtent(new Rectangle2D.Double(x, y + h , w, h));

                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 lyr.getFullExtent();

                //Ajustamos el extent al del raster

                Extent ext = new Extent(extent);//.getX(), extent.getY(), extent.getX() + extent.getWidth(), extent.getY() - extent.getHeight());

                Extent extSelection = RasterUtilities.calculateAdjustedView(ext, lyr.getFullRasterExtent());

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

                ViewPortData vp = new ViewPortData(        null, ext, new Dimension(view.getCanvasWidth(), view.getCanvasHeight()));

                vp.calculateAffineTransform();

                //Calculamos el punto del canvas de la vista donde se empieza a dibujar el buffer de la imagen

                Point2D pt = new Point2D.Double(extSelection.getULX(), extSelection.getLRY());

                vp.mat.transform(pt, pt);

                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);

                        BufferedImage drawedImg = (BufferedImage)lyr.getRender().draw((Graphics2D)initImg.getGraphics(), vp);

                        ((Graphics2D)initImg.getGraphics()).drawImage(drawedImg, (int) Math.round(pt.getX()), (int) Math.round(pt.getY()), null);

                        //Asignamos el buffer a dibujar al canvas

                        if(initImg != null)

                                setDrawParams(initImg, extent);

                        else

                                throw new InvalidSetViewException("Buffer de dibujado vacio");

                } catch (RasterDriverException e) {

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

                } catch (InvalidSetViewException e) {

                        throw new InvalidRequestException("Error asignando el ?rea de la petici?n");

                } catch (InterruptedException e) {

                }

                return extent;

        }

        /*

         * (non-Javadoc)

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

         */

        public void fullExtent() throws InvalidRequestException  {

                this.initRequest(lyr.getFullRasterExtent().toRectangle2D());

        }

        /**

         * 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 && lyr != null) {

                        if(img != null)

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

                }

        }

}