Application: gvSIG desktop

/*

 * Cresques Mapping Suite. Graphic Library for constructing mapping applications.

 * 

 * Copyright (C) 2004-5. 

 *

 * 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.

 *

 * For more information, contact:

 * 

 * cresques@gmail.com

 */

package org.cresques.geo;

import java.awt.Dimension;

import java.awt.geom.AffineTransform;

import java.awt.geom.Dimension2D;

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.

 * 

 * @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.

         */

        Dimension2D 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, Dimension2D 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.getWidth(); } 

        public double getHeight() { return size.getHeight(); }

        /**

         * 

         */

        public Dimension2D getSize() {

                return size;                

        }

        public void setSize(double w, double h) {

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

        }

        public void setSize(Dimension2D sz) {

                size = sz;

                reExtent();

        }

        public Extent getExtent() { return extent; }

        public void setExtent(Dimension2D sz) {

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

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

                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());

        }

}