| gvSIG desktop 1

/* 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;

import java.awt.Dimension;

import java.awt.geom.AffineTransform;

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.IBuffer;

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.ui.zoom.IExtensionRequest;

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

/**

 * 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 ViewDialog        view = null;

        /**

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

         * @param lyr

         */

        public ViewRasterRequestManager(ViewDialog 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) {

                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.getCanvasWith() * h) / view.getCanvasHeight();

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

                } else {

                        x = extent.getX();

                        w = extent.getWidth();

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

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

                }

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

                request(r);

                return r;

        }

        public Rectangle2D request(Rectangle2D extent) {

                if(extent == null)

                        return lyr.getFullExtent();

                //Ajustamos el extent al del raster

                Extent ext = new Extent(extent);

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

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

                vp.mat = new AffineTransform();

                vp.mat.setToScale(view.getCanvasWith()/ext.width() , -view.getCanvasHeight()/ext.height());

                try {

                        BufferedImage img = (BufferedImage)lyr.getRender().draw(view.getCanvasGraphic(), vp);

                        if(img != null)

                                setDrawParams(img, extSelection.toRectangle2D());

                        else

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

                } catch (RasterDriverException e) {

                } catch (InvalidSetViewException e) {

                } catch (InterruptedException e) {

                }

                return extent;

        }

        /*

         * (non-Javadoc)

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

         */

        public void fullExtent() {

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

        }

        /**

         * Dibuja la capa raster pasada por par?metro sobre un buffer con las coordenadas

         * pixel especificadas.

         * @param size Tama?o del graphics sobre el que se dibuja

         * @param x Posici?n x donde se empieza a leer la capa raster para la petici?n

         * @param y Posici?n x donde se empieza a leer la capa raster para la petici?n

         * @param w Ancho de la petici?n sobre la capa raster

         * @param h Alto de la petici?n sobre la capa raster

         */

        private BufferedImage drawRasterLayer(Dimension size, int x, int y, int w, int h, int wCanvas, int hCanvas) {

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

                int pxW = 0, pxH = 0;

                if(        (size.getWidth() > size.getHeight() && r.getWidth() > r.getHeight()) ||

                        (size.getWidth() < size.getHeight() && r.getWidth() > r.getHeight())) {

                        pxW = (int)size.getWidth();

                        pxH =  (int)((r.getHeight() * size.getWidth()) / r.getWidth());

                } else {

                        pxH = (int)size.getHeight();

                        pxW =  (int)((r.getWidth() * size.getHeight()) / r.getHeight());

                }

                BufferedImage img = new BufferedImage(pxW, pxH, BufferedImage.TYPE_INT_RGB);

                try {

                        if (lyr.getBufferFactory() != null && lyr.getBandCount() == 1) {

                                lyr.getBufferFactory().setDrawableBands(new int[] { 0, 0, 0 });

                        } else if (lyr.getBufferFactory() != null && lyr.getBufferFactory().getDataSource().getBandCount() == 2) {

                                lyr.getBufferFactory().setDrawableBands(new int[] { 0, 1, 1 });

                        } else {

                                lyr.getBufferFactory().setDrawableBands(new int[] { 0, 1, 2 });

                        }

                        lyr.getBufferFactory().setAreaOfInterest(x, y, w, h, pxW, pxH);

                        IBuffer buf = lyr.getBufferFactory().getRasterBuf();

                        for (int i = 0; i < pxH; i++) {

                                for (int j = 0; j < pxW; j++) {

                                        img.setRGB(j, i, ((buf.getElemByte(i, j, 0) & 0xff) << 16) + 

                                                                        ((buf.getElemByte(i, j, 1) & 0xff) << 8) +

                                                                        (buf.getElemByte(i, j, 2) & 0xff));

                                }

                        }

                } catch (RasterDriverException e) {

                        //TODO: Lanzar una excepci?n

                } catch (InvalidSetViewException e) {

                        //TODO: Lanzar una excepci?n

                } catch (InterruptedException e) {

                        //TODO: Lanzar una excepci?n

                } catch (NullPointerException e) {

                        //TODO: Lanzar una excepci?n

                }

                return img;

        }

        /**

         * Dibuja la capa raster pasada por par?metro sobre un buffer.

         * @param size Tama?o del graphics sobre el que se dibuja

         * @return BufferedImage cargado con los datos o null si no se ha podido dibujar

         */

        public BufferedImage drawRasterLayer(Dimension size) {

                return drawRasterLayer(size, 0, 0, (int)lyr.getPxWidth(), (int)lyr.getPxHeight(), view.getCanvasWith(), view.getCanvasHeight());

        }

        /**

         * 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) {

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

                }

        }

}