| gvSIG desktop 1

/* gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana

 *

 * Copyright (C) 2004 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.

 *

 * For more information, contact:

 *

 *  Generalitat Valenciana

 *   Conselleria d'Infraestructures i Transport

 *   Av. Blasco Ib??ez, 50

 *   46010 VALENCIA

 *   SPAIN

 *

 *      +34 963862235

 *   gvsig@gva.es

 *      www.gvsig.gva.es

 *

 *    or

 *

 *   IVER T.I. S.A

 *   Salamanca 50

 *   46005 Valencia

 *   Spain

 *

 *   +34 963163400

 *   dac@iver.es

 */

package com.iver.cit.gvsig.fmap;

import java.awt.Color;

import java.awt.Dimension;

import java.awt.Point;

import java.awt.Toolkit;

import java.awt.geom.AffineTransform;

import java.awt.geom.NoninvertibleTransformException;

import java.awt.geom.Point2D;

import java.awt.geom.Rectangle2D;

import java.util.ArrayList;

import org.cresques.cts.GeoCalc;

import org.cresques.cts.IProjection;

import org.cresques.cts.gt2.CSUTM;

import org.cresques.geo.ViewPortData;

import com.iver.cit.gvsig.fmap.crs.CRSFactory;

import com.iver.cit.gvsig.fmap.layers.RasterAdapter;

import com.iver.utiles.StringUtilities;

import com.iver.utiles.XMLEntity;

/**

 * <p>The <code>ViewPort</code> class represents the information needed to transform an area of a map that user

 *  will use to work to the available area of a gvSIG's view in screen.</p>

 *  

 * <p>That's an affine transformation, between the rectangular area selected of the external map, in its own

 *  <i>map coordinates</i>, to the rectangular area of a view in <i>screen coordinates</i>.</p>

 * 

 * <p>Then we have:

 * <ul>

 * <li><i>extent</i>: the area selected of the map, in <i>map coordinates</i>.

 * <li><i>imageSize</i>: width and height in pixels (<i>screen coordinates</i>) of the area available

 *  in screen to display the area selected of the map. 

 * <li><i>adjustedExtent</i>: the area selected must be an scale of <i>imageSize</i>.<br>This implies adapt the

 *  extent, preserving and centering it, and adding around the needed area to fill all the image size. That

 *  added area will be extracted from the original map, wherever exists, and filled with the background color

 *  wherever not. 

 * <li><i>scale</i>: the scale between the adjusted extent and the image size.

 * <li><i>backColor</i>: the default background color in the view, if there is no map area. 

 * <li><i>trans</i>: the affine transformation.

 * <li><i>proj</i>: map projection used in this view  

 * <li><i>distanceUnits</i>: distance measurement unit, for data in screen.

 * <li><i>mapUnits</i>: measurement unit, for data in map.

 * <li><i>extents</i>: an {@link ExtentHistory ExtentHistory} with the last previous extents.

 * <li><i>offset</i>: position in pixels of the view, where start drawing the map.

 * <li><i>dist1pixel</i>: the distance in <i>world coordinates</i> equivalent to 1 pixel in the view with the

 *  current extent.

 * <li><i>dist3pixel</i>: the distance in <i>world coordinates</i> equivalent to 3 pixels in the view with the

 *  current extent.

 * <li><i>listeners</i>: list with the {@link ViewPortListener ViewPortListener} registered. 

 * </ul>

 * </p>

 *  

 * @author Vicente Caballero Navarro

 */

public class ViewPort {

        /**

         * <p>Metric unit or length equal to 1000 meters.</p>

         */

        public static int KILOMETROS = 0;

        /**

         * <p>The base unit of length in the International System of Units that is equal to the distance

         *  traveled by light in a vacuum in {frac;1;299,792,458} second or to about 39.37 inches.</p>

         */

        public static int METROS = 1;

        /**

         * <p>Metric unit or length equal to 0'01 meters.</p>

         */

        public static int CENTIMETRO = 2;

        /**

         * <p>Metric unit or length equal to 0'001 meters.</p>

         */

        public static int MILIMETRO = 3;

        /**

         * <p>The statute miles is a unit of length originated from a Statute of the English parliament in 1592 during

         *  the reign of Elizabeth I.as 5,280 feet or 1,760 yards; or 63,360 inches.</p> 

         */

        public static int MILLAS = 4;

        /**

         * <p>Unit of length equal in the United States to 0.9144 meter.</p> 

         */

        public static int YARDAS = 5;

        /**

         * <p>Any of various units of length based on the length of the human foot; especially :

         *  a unit equal to 1/3 yard and comprising 12 inches.</p>

         */

        public static int PIES = 6;

        /**

         * <p>Unit of length equal to 1/36 yard.</p>

         */

        public static int PULGADAS = 7;

        /**

         * <p>Grades according the current projection.</p>

         */

        public static int GRADOS = 8;

        /**

         * <p>Screen resolution in <i>dots-per-inch</i>. Useful to calculate the geographic scale of the view.</p>

         * 

         * @see Toolkit#getScreenResolution()

         * @see #getScale()

         */

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

        /**

         * <p>Area selected by user using some tool.</p>

         * 

         * <p>When the zoom changes (for instance when using the zoom in or zoom out tools,

         * but also zooming to a selected feature or shape) the extent that covers that

         * area is the value returned by this method. It is not the actual area shown

         * in the view because it does not care about the aspect ratio. However, any

         * part of the real world contained in this extent is shown in the view.

         * </p>

         * <p>

         * Probably this is not what you are looking for. If you are looking for

         * the complete extent currently shown, you must use {@linkplain #getAdjustedExtent()} method

         * which returns the extent that contains this one but regarding the current

         * view's aspect ratio.

         * </p>

         * 

         * @see #getExtent()

         * @see #setExtent()

         */

        private Rectangle2D extent;

        /**

         * <p>Location and dimensions of the extent adjusted to the image size.</p>

         * 

         * @see #getAdjustedExtent()

         */

        private Rectangle2D adjustedExtent;

        /**

         * <p>History with the last extents of the view.</p>

         * 

         * @see #setPreviousExtent()

         * @see #getExtents()

         */

        private ExtentHistory extents = new ExtentHistory();

        /**

         * <p>Size in <i>screen coordinates</i> of the rectangle where the image is displayed.</p>

         * <p>Used by {@linkplain} #calculateAffineTransform()} to calculate:<br>

           * 

         * <ul>

         * <li>The new {@link #scale scale} .

         * <li>The new {@link #adjustedExtent adjustableExtent} .

         * <li>The new {@link #trans trans} .

         * <li>The new real world coordinates equivalent to 1 pixel ({@link #dist1pixel dist1pixel}) .

         * <li>The new real world coordinates equivalent to 3 pixels ({@link #dist3pixel dist3pixel}) .

         * </ul>

         * </p>

         * 

         * @see #getImageSize()

         * @see #getImageHeight()

         * @see #getImageWidth()

         * @see #setImageSize(Dimension)

         */

        private Dimension imageSize;

        /**

         * <p>Affine transformation between <i>map 2D coordinates</i> to <i>screen 2D coordinates</i> (pixels).</p>

         *  

         * @see AffineTransform

         * 

         * @see #getAffineTransform()

         * @see #setAffineTransform(AffineTransform)

         * @see #calculateAffineTransform()

         */

        private AffineTransform trans = new AffineTransform();

        /**

         * <p>Measurement unit used for measuring distances and displaying information.</p>

         * 

         * @see #getDistanceUnits()

         * @see #setDistanceUnits(int)

         */

        private int distanceUnits = METROS;

        /**

         * <p>Measurement unit used by this view port for the map.</p>

         * 

         * @see #getMapUnits()

         * @see #setMapUnits(int)

         */

        private int mapUnits = METROS;

        /**

         * <p>Array with the {@link ViewPortListener ViewPortListener}s registered to this view port.</p>

         * 

         * @see #addViewPortListener(ViewPortListener)

         * @see #removeViewPortListener(ViewPortListener)

         */

        private ArrayList listeners = new ArrayList();

        /**

         * <p>The offset is the position where start drawing the map.</p>

         * <p>The offset of a <a href="http://www.gvsig.gva.es/">gvSIG</a>'s <i>View</i> is

         * always (0, 0) because the drawing area fits with the full window area. But in

         * a <a href="http://www.gvsig.gva.es/">gvSIG</a>'s <i>Layout</i> it's up to the place where

         * the <code>FFrameView</code> is located.</p>

         * 

         * @see #getOffset()

         * @see #setOffset(Point2D)

         */

        private Point2D offset = new Point2D.Double(0, 0);

        /**

         * <p>Clipping area.</p>

         */

        private Rectangle2D clip;

        /**

         * <p>Background color of this view.</p>

         * 

         * @see #getBackColor()

         * @see #setBackColor(Color)

         */

        private Color backColor = null; //Color.WHITE;

        /**

         * <p>Information about the map projection used in this view.</p>

         * 

         * @see #getProjection()

         * @see #setProjection(IProjection)

         */

        private IProjection proj;

        /**

         * <p>Represents the distance in <i>world coordinates</i> equivalent to 1 pixel in the view with the current extent.</p>

         * 

         * @see #getDist1pixel()

         * @see #setDist1pixel(double)

         */

        private double dist1pixel;

        /**

         * <p>Represents the distance in <i>world coordinates</i> equivalent to 3 pixels in the view with the current extent.</p>

         * 

         * @see #getDist3pixel()

         * @see #setDist3pixel(double)

         */

        private double dist3pixel;

        /**

         * <p>Ratio between the size of <code>imageSize</code> and <code>extent</code>:<br> <i><pre>min{(imageSize.getHeight()/extent.getHeight(), imageSize.getWidth()/extent.getWidth())}</pre></i></p>

         */

        private double scale;

        /**

         * <p>Clipping area.</p>

         * 

         * @see #setClipRect(Rectangle2D)

         */

        private Rectangle2D cliprect;

        /**

         * <p>Enables or disables the <i>"adjustable extent"</i> mode.</p>

         * 

         * <p>

         * When calculates the affine transform, if

         * <ul>

         * <li><i>enabled</i>: the new <code>adjustedExtent</code> will have the (X, Y) coordinates of the <code>extent</code> and

         *  an area that will be an scale of the image size. That area will have different.

         *  height or width (not both) of the extent according the least ratio (height or width) in <i>"image.size/extent.size"</i>.

         * <li><i>disabled</i>: the new <code>adjustedExtent</code> will be like <code>extent</code>.

         * </ul>

         * </p>

         * 

         * @see #setAdjustable(boolean)

         */

        private boolean adjustableExtent=true;

        /**

         * <p>Creates a new view port with the information of the projection in <code>proj</code> argument, and

         *  default configuration:<br>

         *

         * <ul>

         *  <li><i><code>distanceUnits</code></i> = meters

         *  <li><i><code>mapUnits</code></i> = meters

         *  <li><i><code>backColor</code></i> = <i>undefined</i>

         *  <li><i><code>offset</code></i> = <code>new Point2D.Double(0, 0);</code>

         * </ul>

         * </p>

         *

         * @param proj information of the projection for this view port

         */

        public ViewPort(IProjection proj) {

                // Por defecto

                this.proj = proj;

        }

        /**

         * <p>Changes the status of the <i>"adjustable extent"</i> option to enabled or disabled.</p>

         *

         * @param boolean the boolean to be set

         */

        public void setAdjustable(boolean adjustable) {

                adjustableExtent = adjustable;

        }

        /**

         * <p>Appends the specified {@link ViewPortListener ViewPortListener} listener if weren't.</p>

         * 

         * @param arg0 the listener to add

         *

         * @return <code>true</code> if has been added successfully

         * 

         * @see #removeViewPortListener(ViewPortListener)

         */

        public boolean addViewPortListener(ViewPortListener arg0) {

                if (!listeners.contains(arg0))

                        return listeners.add(arg0);

                return false;

        }

        /**

         * @see ArrayList#remove(Object)

         * 

         * @see #addViewPortListener(ViewPortListener)

         */

        public boolean removeViewPortListener(ViewPortListener arg0) {

                return listeners.remove(arg0);

        }

        /**

         * <p>Converts and returns the distance <code>d</code> argument, that is in <i>map

         *  coordinates</i> to <i>screen coordinates<i/> using a <i>delta transform</i> with

         *  the transformation affine information in the {@link #trans #trans} attribute.</p>

         *

         * @param d distance in <i>map coordinates</i>

         *

         * @return distance equivalent in <i>screen coordinates<i>

         * 

         * @see #toMapDistance(int)

         * @see AffineTransform#deltaTransform(Point2D, Point2D)S

         */

        public int fromMapDistance(double d) {

                Point2D.Double pWorld = new Point2D.Double(1, 1);

                Point2D.Double pScreen = new Point2D.Double();

                try {

                        trans.deltaTransform(pWorld, pScreen);

                } catch (Exception e) {

                        System.err.print(e.getMessage());

                }

                return (int) (d * pScreen.x);

        }

        /**

         * <p>Converts and returns the distance <code>d</code> argument, that is in <i>screen

         *  coordinates</i> to <i>map coordinates<i/> using the transformation affine information

         *  in the {@link #trans #trans} attribute.</p>

         *

         * @param d distance in pixels

         *

         * @return distance equivalent in <i>map coordinates<i>

         * 

         * @see #fromMapDistance(double)

         * @see AffineTransform

         */

        public double toMapDistance(int d) {

                double dist = d / trans.getScaleX();

                return dist;

        }

        /**

         * <p>Converts and returns the {@link Rectangle2D Rectangle2D}, that is in <i>map

         *  coordinates</i> to <i>screen coordinates<i/> (pixels) using an <i>inverse transform</i> with

         *  the transformation affine information in the {@link #trans #trans} attribute.</p>

         * 

         * @param r the 2D rectangle in <i>map coordinates</i>

         * @return 2D rectangle equivalent in <i>screen coordinates</i> (pixels)

         * 

         * @see #toMapRectangle(Rectangle2D)

         * @see #fromMapDistance(double)

         * @see #fromMapPoint(Point2D)

         */

        public Rectangle2D fromMapRectangle(Rectangle2D r) {

                double w=fromMapDistance((int)r.getWidth());

                double h=fromMapDistance((int)r.getHeight());

                Point2D p1=fromMapPoint((int)r.getX(),(int)r.getY());

                return new Rectangle2D.Double(p1.getX(),p1.getY(),w,h);

        }

        /**

         * <p>Converts and returns the {@link Rectangle2D Rectangle2D}, that is in <i>screen

         *  coordinates</i> (pixels) to <i>map coordinates<i/> using <i>transforms</i> with

         *  the transformation affine information in the {@link #trans #trans} attribute.</p>

         * 

         * @param r the 2D rectangle in <i>screen coordinates</i> (pixels)

         * @return 2D rectangle equivalent in <i>map coordinates</i>

         * 

         * @see #fromMapRectangle(Rectangle2D)

         * @see #toMapDistance(int)

         * @see #toMapPoint(int, int)

         */

        public Rectangle2D toMapRectangle(Rectangle2D r){

                double w=toMapDistance((int)r.getWidth());

                double h=toMapDistance((int)r.getHeight());

                Point2D p1=toMapPoint((int)r.getX(),(int)r.getY());

                return new Rectangle2D.Double(p1.getX(),p1.getY(),w,h);

        }

        /**

         * <p>Converts and returns the 2D point <code>(x,y)</code>, that is in <i>map

         *  coordinates</i> to <i>screen coordinates<i/> (pixels) using a <i>transform</i> with

         *  the transformation affine information in the {@link #trans #trans} attribute.</p>

         *

         * @param x the <code>x</code> <i>map coordinate</i> of a 2D point

         * @param y the <code>y</code> <i>map coordinate</i> of a 2D point

         *

         * @return 2D point equivalent in <i>screen coordinates<i> (pixels)

         * 

         * @see #fromMapPoint(Point2D)

         * @see AffineTransform#transform(Point2D, Point2D)

         */

        public Point2D fromMapPoint(double x, double y) {

                Point2D.Double pWorld = new Point2D.Double(x, y);

                Point2D.Double pScreen = new Point2D.Double();

                try {

                        trans.transform(pWorld, pScreen);

                } catch (Exception e) {

                        System.err.print(e.getMessage());

                }

                return pScreen;

        }

        /**

         * <p>Converts and returns the 2D point argument, that is in <i>map

         *  coordinates</i> to <i>screen coordinates<i/> (pixels) using a <i>transform</i> with

         *  the transformation affine information in the {@link #trans #trans} attribute.</p>

         *

         * @param point the 2D point in <i>map coordinates</i>

         *

         * @return 2D point equivalent in <i>screen coordinates<i> (pixels)

         * 

         * @see #toMapPoint(Point2D)

         * @see #fromMapPoint(double, double)

         */

        public Point2D fromMapPoint(Point2D point) {

                return fromMapPoint(point.getX(), point.getY());

        }

        /**

         * <p>Converts and returns the 2D point <code>(x,y)</code>, that is in <i>screen coordinates<i/>

         *  (pixels) to <i>map coordinates</i> using a <i>transform</i> with

         *  the transformation affine information in the {@link #trans #trans} attribute.</p>

         *

         * @param x the <code>x</code> <i>screen coordinate</i> of a 2D point

         * @param y the <code>y</code> <i>screen coordinate</i> of a 2D point

         *

         * @return 2D point equivalent in <i>map coordinates<i>

         * 

         * @see #toMapPoint(Point2D)

         * @see #fromMapPoint(double, double)

         */

        public Point2D toMapPoint(int x, int y) {

                Point pScreen = new Point(x, y);

                return toMapPoint(pScreen);

        }

        /**

         * <p>Converts and returns the 2D point argument, that is in <i>screen coordinates<i/>

         *  (pixels) to <i>map coordinates</i> using an <i>inverse transform</i> with

         *  the transformation affine information in the {@link #trans #trans} attribute.</p>

         * 

         * @param pScreen the 2D point in <i>screen coordinates</i> (pixels)

         *

         * @return 2D point equivalent in <i>map coordinates<i>

         * 

         * @see #toMapPoint(int, int)

         * @see AffineTransform#createInverse()

         * @see AffineTransform#transform(Point2D, Point2D)

         */

        public Point2D toMapPoint(Point2D pScreen) {

                Point2D.Double pWorld = new Point2D.Double();

                AffineTransform at;

                try {

                        at = trans.createInverse();

                        at.transform(pScreen, pWorld);

                } catch (NoninvertibleTransformException e) {

                        throw new RuntimeException(e);

                }

                return pWorld;

        }

        /**

         * <p>Returns the distance in meters between two points 2D that are in <i>map coordinates</i>. If

         *  the projection of this view is UTM, considers the Earth curvature.</p>

         *

         * @param pt1 a 2D point in <i>map coordinates</i>

         * @param pt2 another 2D point in <i>map coordinates</i>

         *

         * @return the distance in meters between the two points 2D

         * 

         * @see GeoCalc#distanceVincenty(Point2D, Point2D)

         */

        public double distanceWorld(Point2D pt1, Point2D pt2) {

                double dist = -1;

                dist = pt1.distance(pt2);

                if ((proj != null) && !(proj instanceof CSUTM)) {

                        dist = new GeoCalc(proj).distanceVincenty(proj.toGeo(pt1),

                                        proj.toGeo(pt2));

                }

                return dist*MapContext.CHANGEM[getMapUnits()];

        }

        /**

         * <p>Sets as current view's extent and adjusted extent, the previous.</p>

         * 

         * @see #getExtents()

         * @see #calculateAffineTransform()

         */

        public void setPreviousExtent() {

                extent = extents.removePrev();

                //Calcula la transformaci?n af?n

                calculateAffineTransform();

                // Lanzamos los eventos de extent cambiado

                callExtentChanged(getAdjustedExtent());

        }

        /**

         * <p>Gets the area selected by user using some tool.</p>

         * 

         * <p>When the zoom changes (for instance when using the <i>zoom in</i> or <i>zoom out</i> tools,

         *  but also zooming to a selected feature or shape) the extent that covers that

         *  area is the value returned by this method. It is not the actual area shown

         *  because it doesn't care about the aspect ratio of the image size of the view. However, any

         *  part of the real world contained in this extent is shown in the view.</p>

         * <p>If you are looking for the complete extent currently shown, you must use the

         *  {@linkplain #getAdjustedExtent()} method.</p>

         * 

         * @return the current extent

         * 

         * @see #setExtent(Rectangle2D)

         * @see #getAdjustedExtent()

         * @see #setPreviousExtent()

         * @see #getExtents()

         */

        public Rectangle2D getExtent() {

                return extent;

        }

        /**

         * <p>Changes the extent and adjusted extent of this view port:<br>

         * <ul>

         * <li>Stores the previous extent.

         * <li>Calculates the new extent using <code>r</code>:

         * <pre>extent = new Rectangle2D.Double(r.getMinX() - 0.1, r.getMinY() - 0.1, r.getWidth() + 0.2, r.getHeight() + 0.2);</pre>

         * <li>Executes {@linkplain #calculateAffineTransform()}: getting the new scale, adjusted extent, affine transformation between

         *  map and screen coordinates, the real world coordinates equivalent to 1 pixel, and the real world coordinates equivalent to 3 pixels.

         * <li>Notifies to all {@link ViewPortListener ViewPortListener}s registered that the extent has changed.

         * </ul>

         * </p>

         *

         * @param r the new extent

         * 

         * @see #getExtent()

         * @see #getExtents()

         * @see #calculateAffineTransform()

         * @see #setPreviousExtent()

         */

        public void setExtent(Rectangle2D r) {

                if (extent != null) {

                        extents.put(extent);

                }

                //Esto comprueba que el extent no es de anchura o altura = "0"

                //y si es as? lo redimensiona.

                if (r!=null &&((r.getWidth() == 0) || (r.getHeight() == 0))) {

                        extent = new Rectangle2D.Double(r.getMinX() - 0.1,

                                        r.getMinY() - 0.1, r.getWidth() + 0.2, r.getHeight() + 0.2);

                } else {

                        extent = r;

                }

                //Calcula la transformaci?n af?n

                calculateAffineTransform();

                // Lanzamos los eventos de extent cambiado

                callExtentChanged(getAdjustedExtent());

        }

        /**

         * <p>Changes the extent and adjusted extent of this view port:<br>

         * <ul>

         * <li>Stores the previous extent.

         * <li>Calculates the new extent using <code>r</code>:

         * <pre>extent = new Rectangle2D.Double(r.getMinX() - 0.1, r.getMinY() - 0.1, r.getWidth() + 0.2, r.getHeight() + 0.2);</pre>

         * <li>Executes {@linkplain #calculateAffineTransform()}: getting the new scale, adjusted extent, affine transformation between

         *  map and screen coordinates, the real world coordinates equivalent to 1 pixel, and the real world coordinates equivalent to 3 pixels.

         * <li>Notifies to all {@link ViewPortListener ViewPortListener}s registered that the extent has changed.

         * </ul>

         * </p>

         * 

         * @see #setExtent(Rectangle2D)

         * @see #calculateAffineTransform()

         */

        public void refreshExtent() {

                //this.scale = scale;

                //Calcula la transformaci?n af?n

                calculateAffineTransform();

                // Lanzamos los eventos de extent cambiado

                callExtentChanged(getAdjustedExtent());

        }

        /**

         * <p>Calculates and returns using the current projection of this view port, the scale that

         *  is the extent in <i>screen coordinates</i> from the image in <i>map coordinates</i>.</p>

         *

         * @return the scale <i>extent / image size</i> projected by this view port

         * 

         * @deprecated since 07/09/07, use {@linkplain MapContext#getScaleView()}

         */

        public double getScale() {

                return proj.getScale(extent.getMinX(), extent.getMaxX(),

                        imageSize.getWidth(), dpi);

        }

        /**

         * <p>Recalculates the current {@linkplain #extent} using an scale. It's necessary execute {@linkplain #refreshExtent()} after.</p>

         * 

         * @param s the scale to set

         * 

         * @deprecated since 07/09/07, use {@linkplain MapContext#setScaleView(long)} 

         */

        public void setScale(long s){

                double x=extent.getX();

                double y=extent.getY();

                double escalaX = imageSize.getWidth() / extent.getWidth();

                double w=imageSize.getWidth() / s;

                double h=imageSize.getHeight() / s;

                double difw = escalaX/s;

                double x1 = (-x * difw) -

            x+

            extent.getWidth()/2;

        double y1 = (-y * difw) -

            y +

            extent.getHeight()/2;

        double w1=extent.getWidth()*difw;

        double h1=extent.getHeight()*difw;

                extent.setRect(-x1,-y1,w1,h1);

        }        

        /**

         * <p>Affine transformation between <i>map 2D coordinates</i> to <i>screen 2D coordinates</i> (pixels),

         * preserving the "straightness" and "parallelism" of lines.</p>

         *

         * @return the affine transformation

         * 

         * @see #setAffineTransform(AffineTransform)

         * @see #calculateAffineTransform()

         */

        public AffineTransform getAffineTransform() {

                return trans;

        }

        /**

         * <p>Returns the size of the image projected.</p>

         *

         * @return the image size

         * 

         * @see #setImageSize(Dimension)

         * @see #getImageHeight()

         * @see #getImageWidth()

         */

        public Dimension getImageSize() {

                return imageSize;

        }

        /**

         * <p>Sets the size of the image projected, recalculating the parameters of this view port.</p>

         *

         * @param imageSize the image size

         * 

         * @see #getImageSize()

         * @see #calculateAffineTransform()

         */

        public void setImageSize(Dimension imageSize) {

                this.imageSize = imageSize;

                calculateAffineTransform();

        }

        /**

         * <p>Notifies to all view port listeners registered, that the adjusted extent of this view port

         *  has changed.</p>

         *

         * @param newRect the new adjusted extend

         * 

         * @see #refreshExtent()

         * @see #setExtent(Rectangle2D)

         * @see #setPreviousExtent()

         * @see ExtentEvent

         * @see ViewPortListener

         */

        private void callExtentChanged(Rectangle2D newRect) {

                ExtentEvent ev = ExtentEvent.createExtentEvent(newRect);

                for (int i = 0; i < listeners.size(); i++) {

                        ViewPortListener listener = (ViewPortListener) listeners.get(i);

                        listener.extentChanged(ev);

                }

        }

        /**

         * <p>Notifies to all view port listeners registered, that the background color of this view port

         *  has changed.</p>

         *

         * @param c the new background color

         * 

         * @see #setBackColor(Color)

         * @see ColorEvent

         * @see ViewPortListener

         */

        private void callColorChanged(Color c) {

                ColorEvent ce = ColorEvent.createColorEvent(c);

                for (int i = 0; i < listeners.size(); i++) {

                        ViewPortListener listener = (ViewPortListener) listeners.get(i);

                        listener.backColorChanged(ce);

                }

        }

        /**

         * <p>Notifies to all view port listeners registered, that the projection of this view port

         *  has changed.</p>

         *

         * @param projection the new projection

         * 

         * @see #setProjection(IProjection)

         * @see ProjectionEvent

         * @see ViewPortListener

         */

        private void callProjectionChanged(IProjection projection) {

                ProjectionEvent ev = ProjectionEvent.createProjectionEvent(projection);

                for (int i = 0; i < listeners.size(); i++) {

                        ViewPortListener listener = (ViewPortListener) listeners.get(i);

                        listener.projectionChanged(ev);

                }

        }

        /**

         * <p>Calculates the affine transformation between the {@link #extent extent} in <i>map 2D coordinates</i> to

         *  the image area in the screen, in <i>screen 2D coordinates</i> (pixels).</p>

         * 

         * <p>This process recalculates some parameters of this view port:<br>

         * 

         * <ul>

         * <li>The new {@link #scale scale} .

         * <li>The new {@link #adjustedExtent adjustableExtent} .

         * <li>The new {@link #trans trans} .

         * <li>The new real world coordinates equivalent to 1 pixel ({@link #dist1pixel dist1pixel}) .

         * <li>The new real world coordinates equivalent to 3 pixels ({@link #dist3pixel dist3pixel}) .

         * </ul>

         * </p>

         * 

         * @see #getAffineTransform()

         * @see #setAffineTransform(AffineTransform)

         * @see #refreshExtent()

         * @see #setExtent(Rectangle2D)

         * @see #setImageSize(Dimension)

         * @see #setPreviousExtent()

         * @see #createFromXML(XMLEntity)

         * @see AffineTransform

         */

        private void calculateAffineTransform() {

                if ((imageSize == null) || (extent == null) ||

                                (imageSize.getWidth() <= 0) || (imageSize.getHeight() <= 0)) {

                        return;

                }

                AffineTransform escalado = new AffineTransform();

                AffineTransform translacion = new AffineTransform();

                double escalaX;

                double escalaY;

                escalaX = imageSize.getWidth() / extent.getWidth();

                escalaY = imageSize.getHeight() / extent.getHeight();

                double xCenter = extent.getCenterX();

                double yCenter = extent.getCenterY();

                double newHeight;

                double newWidth;

                adjustedExtent = new Rectangle2D.Double();

                if (adjustableExtent) {

                        // If is enabled the adjustable extent mode:

                        // the new 'adjustedExtent' will have the (X, Y) coordinates of the 'extent' and

                        // an area that will be an scale of the image size according the projection. That area will have different

                        // height or width (not both) of the extent according the least ratio image.size/extent.size

                        // The least ratio (height or width) will be used to calculate the other size value of the

                        // new 'adjustedExtent'

                        if (escalaX < escalaY) {

                                scale = escalaX;

                                newHeight = imageSize.getHeight() / scale;

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

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

                        } else {

                                scale = escalaY;

                                newWidth = imageSize.getWidth() / scale;

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

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

                                        extent.getHeight());

                        }

                        escalado.setToScale(scale, -scale);

                }

                else { // adjusted is same as extent

                        scale = escalaX;

                        adjustedExtent.setFrame(extent);

                        escalado.setToScale(escalaX, -escalaY);

                }

                translacion.setToTranslation(-getAdjustedExtent().getX(),

                        -getAdjustedExtent().getY() - getAdjustedExtent().getHeight());

                AffineTransform offsetTrans = new AffineTransform();

                offsetTrans.setToTranslation(offset.getX(), offset.getY());

                trans.setToIdentity();

                trans.concatenate(offsetTrans);

                trans.concatenate(escalado);

                trans.concatenate(translacion);

                // Calculamos las distancias de 1 pixel y 3 pixel con esa transformaci?n

                // de coordenadas, de forma que est?n precalculadas para cuando las necesitemos

                AffineTransform at;

                try {

                        at = trans.createInverse();

                        java.awt.Point pPixel = new java.awt.Point(1, 1);

                        Point2D.Float pProv = new Point2D.Float();

                        at.deltaTransform(pPixel, pProv);

                        dist1pixel = pProv.x;

                        dist3pixel = 3 * pProv.x;

                } catch (NoninvertibleTransformException e) {

                        System.err.println("transformada afin = " + trans.toString());

                        System.err.println("extent = " + extent.toString() +

                                " imageSize= " + imageSize.toString());

                        throw new RuntimeException(e);

                }

        }

        /**

         * <p>Sets the offset.</p>

         * <p>The offset is the position where start drawing the map.</p>

         * <p>The offset of a <a href="http://www.gvsig.gva.es/">gvSIG</a>'s <i>View</i> is

         * always (0, 0) because the drawing area fits with the full window area. But in

         * a <a href="http://www.gvsig.gva.es/">gvSIG</a>'s <i>Layout</i> it's up to the place where

         * the <code>FFrameView</code> is located.</p>

         *

         * @param p 2D point that represents the offset in pixels

         * 

         * @see #getOffset()

         */

        public void setOffset(Point2D p) {

                offset = p;

        }

        /**

         * <p>Gets the offset.</p>

         * <p>The offset is the position where start drawing the map.</p>

         * <p>The offset of a <a href="http://www.gvsig.gva.es/">gvSIG</a>'s <i>View</i> is

         * always (0, 0) because the drawing area fits with the full window area. But in

         * a <a href="http://www.gvsig.gva.es/">gvSIG</a>'s <i>Layout</i> it's up to the place where

         * the <code>FFrameView</code> is located.</p>

         *

         * @return 2D point that represents the offset in pixels

         * 

         * @see #setOffset(Point2D)

         */

        public Point2D getOffset() {

                return offset;

        }

        /**

         * <p>Sets the background color for the view.</p>

         *

         * @param c the new background color

         * 

         * @see #getBackColor()

         */

        public void setBackColor(Color c) {

                backColor = c;

                callColorChanged(backColor);

        }

        /**

         * <p>Gets the background color of this view.</p>

         *

         * @return the background color of the view

         * 

         * @see #setBackColor(Color)

         */

        public Color getBackColor() {

                return backColor;

        }

        /**

         * <p>Returns the extent currently covered by the view adjusted (scaled) to the image size aspect.</p>

         * 

         * @return extent of the view adjusted to the image size aspect

         * 

         * @see #setAdjustable(boolean)

         */

        public Rectangle2D getAdjustedExtent() {

                if (cliprect!=null){

                        return adjustedExtent.createIntersection(cliprect);

                }

                return adjustedExtent;

        }

        /**

         * <p>Returns the measurement unit of this view port used for measuring distances and displaying information.</p>

         *

         * @return the measurement unit of this view used for measuring distances and displaying information

         * 

         * @see #setDistanceUnits(int)

         */

        public int getDistanceUnits() {

                return distanceUnits;

        }

        /**

         * <p>Sets the measurement unit of this view port used for measuring distances and displaying information.</p>

         *

         * @param distanceUnits the measurement unit of this view used for measuring distances and displaying information

         * 

         * @see #getDistanceUnits()

         */

        public void setDistanceUnits(int distanceUnits) {

                this.distanceUnits = distanceUnits;

        }

        /**

         * <p>Gets the measurement unit used by this view port for the map.</p>

         *

         * @return Returns the current map measure unit

         * 

         * @see #setMapUnits(int)

         */

        public int getMapUnits() {

                return mapUnits;

        }

        /**

         * <p>Sets the measurement unit used by this view port for the map.</p>

         *

         * @param mapUnits the new map measure unit

         * 

         * @see #getMapUnits()

         */

        public void setMapUnits(int mapUnits) {

                this.mapUnits = mapUnits;

        }

        /**

         * <p>Gets the size in <i>screen coordinates</i> of the rectangle where the image is displayed.</p>

         * <p>Used by {@linkplain} #calculateAffineTransform()} to calculate:<br>

           * 

         * <ul>

         * <li>The new {@link #scale scale} .

         * <li>The new {@link #adjustedExtent adjustableExtent} .

         * <li>The new {@link #trans trans} .

         * <li>The new real world coordinates equivalent to 1 pixel ({@link #dist1pixel dist1pixel}) .

         * <li>The new real world coordinates equivalent to 3 pixels ({@link #dist3pixel dist3pixel}) .

         * </ul>

         * </p>

         * 

         * @see #getImageHeight()

         * @see #getImageSize()

         * @see #setImageSize(Dimension)

         */

        public int getImageWidth() {

                return imageSize.width;

        }

        /**

         * <p>Sets the size in <i>screen coordinates</i> of the rectangle where the image is displayed.</p>

         * <p>Used by {@linkplain} #calculateAffineTransform()} to calculate:<br>

           * 

         * <ul>

         * <li>The new {@link #scale scale} .

         * <li>The new {@link #adjustedExtent adjustableExtent} .

         * <li>The new {@link #trans trans} .

         * <li>The new real world coordinates equivalent to 1 pixel ({@link #dist1pixel dist1pixel}) .

         * <li>The new real world coordinates equivalent to 3 pixels ({@link #dist3pixel dist3pixel}) .

         * </ul>

         * </p>

         * 

         * @see #getImageWidth()

         * @see #getImageSize()

         * @see #setImageSize(Dimension)

         */

        public int getImageHeight() {

                return imageSize.height;

        }

        /**

         * <p>Gets the distance in <i>world coordinates</i> equivalent to 1 pixel in the view with the current extent.</p> 

         *

         * @return the distance

         * 

         * @see #setDist1pixel(double)

         */

        public double getDist1pixel() {

                return dist1pixel;

        }

        /**

         * <p>Sets the distance in <i>world coordinates</i> equivalent to 1 pixel in the view with the current extent.</p> 

         *

         * @param dist1pixel the distance

         * 

         * @see #getDist1pixel()

         */

        public void setDist1pixel(double dist1pixel) {

                this.dist1pixel = dist1pixel;

        }

        /**

         * <p>Gets the distance in <i>world coordinates</i> equivalent to 3 pixels in the view with the current extent.</p> 

         *

         * @return the distance

         * 

         * @see #setDist3pixel(double)

         */

        public double getDist3pixel() {

                return dist3pixel;

        }

        /**

         * <p>Sets the distance in <i>world coordinates</i> equivalent to 3 pixels in the view with the current extent.</p> 

         *

         * @param dist3pixel the distance

         * 

         * @see #getDist3pixel()

         */

        public void setDist3pixel(double dist3pixel) {

                this.dist3pixel = dist3pixel;

        }

        /**

         * <p>Returns the last previous extents of this view port.</p>

         *

         * @return the last previous extents of this view port

         * 

         * @see #setPreviousExtent()

         */

        public ExtentHistory getExtents() {

                return extents;

        }

        /**

         * <p>Gets the projection used in this view port.</p>

         *

         * @return projection used in this view port

         * 

         * @see #setProjection(IProjection)

         */

        public IProjection getProjection() {

                return proj;

        }

        /**

         * <p>Sets the projection to this view port.</p>

         *

         * @param proj the new projection

         * 

         * @see #getProjection()

         */

        public void setProjection(IProjection proj) {

                if(this.proj == null || !this.proj.getAbrev().equals(proj.getAbrev())) {

                        this.proj = proj;

                        callProjectionChanged(proj);

                }

        }

        /**

         * <p>Sets only the affine transform to this view port, without updating dependent attributes.</p>

         * <p><b><i>This method can be problematic!.</i></b></p>

         * <p>Only used for print, should be removed, redefining the {@link RasterAdapter RasterAdapter} interface,

         *  allowing it to receive a {@link ViewPortData ViewPortData} .</p>

         *

         * @param at the affine transform to set

         * 

         * @see #getAffineTransform()

         * @see #calculateAffineTransform()

         */

        public void setAffineTransform(AffineTransform at)

        {

            this.trans = at;

        }

        /**

         * <p>Returns an XML entity that represents this view port instance:<br>

         * <ul>

         * <li>Properties:

         *  <ul>

         *  <li><i>className</i>: name of this class.

         *  <li>If defined, the adjusted extent:

         *   <ul>

         *   <li><i>adjustedExtentX</i>: X coordinate of the adjusted extent. 

         *   <li><i>adjustedExtentY</i>: Y coordinate of the adjusted extent.

         *   <li><i>adjustedExtentW</i>: width of the adjusted extent.

         *   <li><i>adjustedExtentH</i>: height of the adjusted extent.

         *   </ul> 

         *  <li>If defined, the background color:

         *   <ul>

         *   <li><i>backColor</i>: background color.

         *   </ul> 

         *  <li>If defined, the clip:

         *   <ul>

         *   <li><i>clipX</i>: X coordinate of the clip. 

         *   <li><i>clipY</i>: Y coordinate of clip.

         *   <li><i>clipW</i>: width of the clip.

         *   <li><i>clipH</i>: height of the clip.

         *   </ul> 

         *  <li><i>dist1pixel</i>: the distance in world coordinates equivalent to 1 pixel in the view.

         *  <li><i>dist3pixel</i>: the distance in world coordinates equivalent to 3 pixels in the view.

         *  <li><i>distanceUnits</i>: the distance measurement unit.

         *  <li>If defined, the extent:

         *   <ul>

         *   <li><i>extentX</i>: X coordinate of the extent. 

         *   <li><i>extentY</i>: Y coordinate of the extent.

         *   <li><i>extentW</i>: width of the extent.

         *   <li><i>extentH</i>: height of the extent.

         *   </ul> 

         *  <li><i>mapUnits</i>: the map measurement unit. 

         *  <li><i>offsetX</i>: X coordinate of the offset.

         *  <li><i>offsetY</i>: Y coordinate of the offset. 

         *  <li>If defined, the projection:

         *   <ul>

         *   <li><i>proj</i>: the projection.

         *   </ul> 

         *  <li><i>scale</i>: ratio between the size of imageSize and extent.

         *  </ul>

         * <li>Child branches:

         *  <ul>

         *  <li>XML entity of the internal {@link ExtentHistory ExtentHistory} .

         *  </ul>

         * </ul>

         * 

         * @return XMLEntity the XML entity

         * 

         * @see #createFromXML(XMLEntity)

         */

        public XMLEntity getXMLEntity() {

                XMLEntity xml = new XMLEntity();

                xml.putProperty("className",this.getClass().getName());

                if (adjustedExtent != null) {

                        xml.putProperty("adjustedExtentX", adjustedExtent.getX());

                        xml.putProperty("adjustedExtentY", adjustedExtent.getY());

                        xml.putProperty("adjustedExtentW", adjustedExtent.getWidth());

                        xml.putProperty("adjustedExtentH", adjustedExtent.getHeight());

                }

                if (backColor != null)

                    xml.putProperty("backColor", StringUtilities.color2String(backColor));

                if (clip != null) {

                        xml.putProperty("clipX", clip.getX());

                        xml.putProperty("clipY", clip.getY());

                        xml.putProperty("clipW", clip.getWidth());

                        xml.putProperty("clipH", clip.getHeight());

                }

                xml.putProperty("dist1pixel", dist1pixel);

                xml.putProperty("dist3pixel", dist3pixel);

                xml.putProperty("distanceUnits", distanceUnits);

                if (extent != null) {

                        xml.putProperty("extentX", extent.getX());

                        xml.putProperty("extentY", extent.getY());

                        xml.putProperty("extentW", extent.getWidth());

                        xml.putProperty("extentH", extent.getHeight());

                }

                xml.addChild(extents.getXMLEntity());

                xml.putProperty("mapUnits", mapUnits);

                xml.putProperty("offsetX", offset.getX());

                xml.putProperty("offsetY", offset.getY());

                if (proj != null) {

                        xml.putProperty("proj", proj.getAbrev());

                }

                xml.putProperty("scale", scale);

                return xml;

        }

        /**

         * <p>Creates a new <code>ViewPort</code> from an XML entity.</p>

         *

         * @param xml an XML entity

         *

         * @return the new <code>ViewPort</code>

         * 

         * @see #getXMLEntity()

         * @see #createFromXML(XMLEntity)

         */

        public static ViewPort createFromXML03(XMLEntity xml) {

                ViewPort vp = new ViewPort(null);

                if (xml.contains("adjustedExtentX")) {

                        vp.adjustedExtent = new Rectangle2D.Double(xml.getDoubleProperty(

                                                "adjustedExtentX"),

                                        xml.getDoubleProperty("adjustedExtentY"),

                                        xml.getDoubleProperty("adjustedExtentW"),

                                        xml.getDoubleProperty("adjustedExtentH"));

                }

                if (xml.contains("backColor")) {

                        vp.setBackColor(StringUtilities.string2Color(xml.getStringProperty(

                                                "backColor")));

                }

                if (xml.contains("clipX")) {

                        vp.clip = new Rectangle2D.Double(xml.getDoubleProperty("clipX"),

                                        xml.getDoubleProperty("clipY"),

                                        xml.getDoubleProperty("clipW"),

                                        xml.getDoubleProperty("clipH"));

                }

                vp.setDist1pixel(xml.getDoubleProperty("dist1pixel"));

                vp.setDist3pixel(xml.getDoubleProperty("dist3pixel"));

                vp.setDistanceUnits(xml.getIntProperty("distanceUnits"));

                vp.extents = ExtentHistory.createFromXML03(xml.getChild(0));

                if (xml.contains("extentX")) {

                        vp.setExtent(new Rectangle2D.Double(xml.getDoubleProperty("extentX"),

                                        xml.getDoubleProperty("extentY"),

                                        xml.getDoubleProperty("extentW"),