Application: gvSIG desktop » gvSIG raster

/* gvSIG. Geographic Information System of the Valencian Government

 *

 * Copyright (C) 2007-2008 Infrastructures and Transports Department

 * of the Valencian Government (CIT)

 *

 * 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., 51 Franklin Street, Fifth Floor, Boston,

 * MA  02110-1301, USA.

 *

 */

package org.gvsig.raster.impl.datastruct;

import java.awt.Dimension;

import java.awt.geom.AffineTransform;

import java.awt.geom.Dimension2D;

import java.awt.geom.Point2D;

import java.awt.geom.Rectangle2D;

import org.cresques.cts.ICoordTrans;

import org.cresques.cts.IProjection;

import org.gvsig.fmap.dal.coverage.datastruct.Extent;

import org.gvsig.fmap.dal.coverage.datastruct.ViewPortData;

import org.gvsig.timesupport.Time;

/**

 * Datos de vista sobre las capas.

 *

 * Mantiene un conjunto de datos necesarios, que describen el modo de

 * ver las capas actual.

 *

 * @author "Luis W. Sevilla"

 */

public class DefaultViewPortData implements ViewPortData {

    /**

     * Tipo de proyecci?n de la vista.

     */

    IProjection proj = null;

    /**

     * Sistema de coordenadas de la vista.

     */

    IProjection cs = null;

    /**

     * Amplitud de la vista, en coordenadas proyectadas.

     */

    Extent extent = null;

    /**

     * Tama?o de la vista, en coordenadas de dispositivo.

     */

    Dimension2D viewSize = null;

    /**

     * Transformaci?n af?n usada en la vista actual.

     */

    public AffineTransform mat = null;

    /**

     * Informaci?n de tama?o en pixeles. Esta no es calculada. Solo se almacena

     * si el usuario la necesita.

     */

    public Point2D pxSize = null;

    private Time time = null;

        /**

     * Resoluci?n (Puntos por pulgada) de la vista actual.

     * Se necesita para los c?lculos de escala geogr?fica.

     */

    int dpi = java.awt.Toolkit.getDefaultToolkit().getScreenResolution();

    public DefaultViewPortData() {

            mat = new AffineTransform();

            mat.scale(1.0, -1.0);

    }

    public DefaultViewPortData(IProjection proj, Extent extent, Dimension2D size) {

        this.proj = proj;

        this.extent = extent;

        this.viewSize = size;

        mat = new AffineTransform();

        mat.scale(1.0, -1.0);

    }

    public IProjection getProjection() {

        return proj;

    }

    public void setProjection(IProjection proj) {

        this.proj = proj;

    }

    public void reProject(ICoordTrans rp) {

        // TODO metodo reProject pendiente de implementar

    }

    public void setCoordSys(IProjection cs) {

        this.cs = cs;

    }

    //public void setCoordTrans(ICoordTrans ct) { this.ct = ct; }

    public AffineTransform getMat() {

        return mat;

    }

    public void setMat(AffineTransform mat) {

        this.mat = mat;

    }

    public Object clone() {

        DefaultViewPortData vp = new DefaultViewPortData();

        if (mat != null) {

            vp.mat = new AffineTransform(mat);

        }

        if (extent != null) {

            vp.extent = new ExtentImpl(extent);

        }

        vp.proj = proj;

        vp.viewSize = viewSize;

        vp.dpi = dpi;

        return vp;

    }

    /**

     * Obtiene el ancho de la vista

     * @return

     */

    public double getWidth() {

        return viewSize.getWidth();

    }

    /**

     * Obtiene el alto de la vista

     * @return

     */

    public double getHeight() {

        return viewSize.getHeight();

    }

    /**

     * Obtiene el tama?o de la vista

     */

    public Dimension2D getSize() {

        return viewSize;

    }

    /**

     * Asigna el ancho y alto de la vista

     * @param w Ancho

     * @param h Alto

     */

    public void setSize(double w, double h) {

        setSize(new Dimension((int) w, (int) h));

    }

    public void setSize(Dimension2D sz) {

            viewSize = sz;

        reExtent();

    }

    public Extent getExtent() {

        return extent;

    }

    public void setExtent(Dimension2D sz) {

        Point2D.Double pt0 = new Point2D.Double(0, 0);

        Point2D.Double ptSz = new Point2D.Double(sz.getWidth(), sz.getHeight());

        try {

            mat.inverseTransform(pt0, pt0);

            mat.inverseTransform(ptSz, ptSz);

        } catch (Exception e) {

            e.printStackTrace();

        }

        extent = new ExtentImpl(pt0, ptSz);

    }

    /**

     * Asigna la extensi?n del raster

     * @param ext Extent

     */

    public void setExtent(Extent ext) {

            extent = ext;

    }

    public void reExtent() {

        setExtent(viewSize);

    }

    public void setDPI(int dpi) {

        this.dpi = dpi;

    }

    public int getDPI() {

        return this.dpi;

    }

    /**

     * zoom a un marco.

     *

     * @param extent

     */

    public void zoom(Extent extent) {

        double[] scale = extent.getScale(getWidth(), getHeight());

        double escala = Math.min(scale[0], scale[1]);

        mat.setToIdentity();

        mat.scale(escala, -escala);

        mat.translate(-extent.minX(), -extent.maxY());

        this.extent = extent;

        reExtent();

    }

    /**

     * zoom centrado en un punto.

     *

     * @param zoom

     * @param pt

     */

    public void zoom(double zoom, Point2D pt) {

        zoom(zoom, zoom, pt);

    }

    public void zoom(double zx, double zy, Point2D pt) {

        centerAt(pt);

        mat.scale(zx, zy);

        centerAt(pt);

        reExtent();

    }

    /**

     * Zoom a una escala (geogr?fica);

     *

     * @param scale

     */

    public void zoomToCenter(double f) {

        Point2D.Double ptCenter = new Point2D.Double(getWidth() / 2.0,

                                                     getHeight() / 2.0);

        try {

            mat.inverseTransform(ptCenter, ptCenter);

        } catch (Exception e) {

            e.printStackTrace();

        }

        zoom(f, ptCenter);

    }

    /**

     * Centrar en un punto.

     *

     * @param pt

     */

    public void centerAt(Point2D pt) {

        Point2D.Double ptCenter = new Point2D.Double(getWidth() / 2.0,

                                                     getHeight() / 2.0);

        try {

            mat.inverseTransform(ptCenter, ptCenter);

            mat.translate(ptCenter.x - pt.getX(), ptCenter.y - pt.getY());

        } catch (Exception e) {

            e.printStackTrace();

        }

        reExtent();

    }

    /**

     * Desplaza la vista actual.

     *

     * @param pt

     */

    public void pan(Point2D ptIni, Point2D ptFin) {

        mat.translate(ptFin.getX() - ptIni.getX(), ptFin.getY() - ptIni.getY());

        reExtent();

    }

    public Point2D getCenter() {

        Point2D.Double ptCenter = new Point2D.Double(getWidth() / 2.0,

                                                     getHeight() / 2.0);

        try {

            mat.inverseTransform(ptCenter, ptCenter);

        } catch (Exception e) {

            e.printStackTrace();

        }

        return ptCenter;

    }

    /**

     * Calcula la transformaci?n af?n.

     */

        public void calculateAffineTransform() {

                if ((viewSize == null) || (extent == null) ||

                        (viewSize.getWidth() <= 0) || (viewSize.getHeight() <= 0)) 

                        return;

                AffineTransform escalado = new AffineTransform();

                AffineTransform translacion = new AffineTransform();

                double escalaX;

                double escalaY;

                escalaX = viewSize.getWidth() / extent.width();

                escalaY = viewSize.getHeight() / extent.height();

                double xCenter = extent.getCenterX();

                double yCenter = extent.getCenterY();

                double newHeight;

                double newWidth;

                Rectangle2D adjustedExtent = new Rectangle2D.Double();

                double scale = 0;

                if (escalaX < escalaY) {

                        scale = escalaX;

                        newHeight = viewSize.getHeight() / scale;

                        adjustedExtent.setRect(xCenter - (extent.width() / 2.0),

                                        yCenter - (newHeight / 2.0), extent.width(), newHeight);

                } else {

                        scale = escalaY;

                        newWidth = viewSize.getWidth() / scale;

                        adjustedExtent.setRect(xCenter - (newWidth / 2.0),

                                        yCenter - (extent.height() / 2.0), newWidth,

                                        extent.height());

                }

                escalado.setToScale(scale, -scale);

                translacion.setToTranslation(-extent.getULX(), -extent.getULY());

                mat.setToIdentity();

                mat.concatenate(escalado);

                mat.concatenate(translacion);

        }

        public Time getTime() {

                return time;

        }

        public void setTime(Time time) {

                this.time = time;

        }

}