Application: gvSIG desktop » gvSIG projections

/**

 * gvSIG. Desktop Geographic Information System.

 *

 * Copyright (C) 2007-2013 gvSIG Association.

 *

 * 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 3

 * 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.

 *

 * For any additional information, do not hesitate to contact us

 * at info AT gvsig.com, or visit our website www.gvsig.com.

 */

package org.cresques.geo;

import java.awt.Dimension;

import java.awt.geom.AffineTransform;

import java.awt.geom.Point2D;

import java.text.DecimalFormat;

import org.cresques.cts.ICoordTrans;

import org.cresques.cts.IProjection;

import org.cresques.px.Extent;

/**

 * Datos de vista sobre las capas.

 *

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

 * ver las capas actual.

 *

 * cmartinez: Esta clase no deber?a formar parte de una API, pero

 * se deja hasta que se aborde el refactoring de libProjection.

 *

 * @author "Luis W. Sevilla" <sevilla_lui@gva.es>

 */

public class ViewPortData implements Projected {

    /**

     * 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.

     */

    Dimension size = null;

    /**

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

     */

    public AffineTransform mat = 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 ViewPortData() {

    }

    public ViewPortData(IProjection proj, Extent extent, Dimension size) {

        this.proj = proj;

        this.extent = extent;

        this.size = 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() {

        ViewPortData vp = new ViewPortData();

        if (mat != null) {

            vp.mat = new AffineTransform(mat);

        }

        if (extent != null) {

            vp.extent = new Extent(extent);

        }

        vp.proj = proj;

        vp.size = size;

        vp.dpi = dpi;

        return vp;

    }

    public double getWidth() {

        return size.width;

    }

    public double getHeight() {

        return size.height;

    }

    /**

     *

     */

    public Dimension getSize() {

        return size;

    }

    public void setSize(double w, double h) {

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

    }

    public void setSize(Dimension sz) {

        size = sz;

        reExtent();

    }

    public Extent getExtent() {

        return extent;

    }

    public void setExtent(Dimension sz) {

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

        Point2D.Double ptSz = new Point2D.Double(sz.width, sz.height);

        try {

            mat.inverseTransform(pt0, pt0);

            mat.inverseTransform(ptSz, ptSz);

        } catch (Exception e) {

            e.printStackTrace();

        }

        extent = new Extent(pt0, ptSz);

    }

    public void reExtent() {

        setExtent(size);

    }

    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 zoomToGeoScale(double scale) {

        double actual = getGeoScale();

        double f = actual / scale;

        zoomToCenter(f);

    }

    /**

     * 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;

    }

    /**

     * Escala Geogr?fica.

     *

     * @param dpi resolucion en puntos por pulgada

     */

    public double getGeoScale() {

        /* // TODO Actulizarlo para Geotools2

        double scale = 0.0;

        if (proj.getClass() == UtmZone.class) { // UTM;

                scale = (extent.maxX()-extent.minX())*        // metros

                        (dpi / 2.54 * 100.0)/                                // px / metro

                        getWidth();                                                        // pixels

        } else if (proj.getClass() == Geodetic.class) { // Geodetic

                scale = (extent.maxX()-extent.minX())*                // grados

                        // 1852.0 metros x minuto de meridiano

                        (dpi / 2.54 * 100.0 * 1852.0 * 60.0)/        // px / metro

                        getWidth();                                                                // pixels

        } else if (proj.getClass() == Mercator.class) { // Mercator

                Projection prj = Geodetic.getProjection((Ellipsoid) proj.getDatum());

                GeoPoint pt1 = (GeoPoint) prj.createPoint(1.0,0.0);

                GeoPoint pt2 = (GeoPoint) prj.createPoint(2.0,0.0);

                ProjPoint ppt1 = (ProjPoint) proj.createPoint(0.0, 0.0);

                ProjPoint ppt2 = (ProjPoint) proj.createPoint(0.0, 0.0);

                ((Mercator) proj).fromGeo(pt1, ppt1);

                ((Mercator) proj).fromGeo(pt2, ppt2);

                //scale = ppt2.getX()-ppt1.getX();

                scale =  ((extent.maxX()-extent.minX())/ (ppt2.getX()-ppt1.getX()) ) *

                //scale = ((extent.maxX()-extent.minX())/ getWidth());// *

                        (dpi / 2.54 * 100.0 * 1852.0 * 60.0) /

                        getWidth();

        } */

        return proj.getScale(extent.minX(), extent.maxX(), getWidth(), dpi);

    }

    public String getGeoScaleAsString(String fmt) {

        DecimalFormat format = new DecimalFormat(fmt);

        return "1:" + format.format(getGeoScale());

    }

}