// **********************************************************************// // <copyright>// //  BBN Technologies//  10 Moulton Street//  Cambridge, MA 02138//  (617) 873-8000// //  Copyright (C) BBNT Solutions LLC. All rights reserved.// // </copyright>// **********************************************************************// // $Source: /cvs/distapps/openmap/src/openmap/com/bbn/openmap/proj/MercatorView.java,v $// $RCSfile: MercatorView.java,v $// $Revision: 1.3.2.1 $// $Date: 2004/10/14 18:27:37 $// $Author: dietrick $// // **********************************************************************package com.bbn.openmap.proj;import java.awt.Point;import com.bbn.openmap.LatLonPoint;import com.bbn.openmap.util.Debug;/** * Implements the MercatorView projection. */public class MercatorView extends Mercator {    /**     * The MercatorView name.     */    public final static transient String MercatorViewName = "MercatorView";    /**     * The MercatorView type of projection.     */    public final static transient int MercatorViewType = 22;    private MercatorViewHelper helper;    // User = the space into which the projection is made    // The relationship between this and the real screen is held    // by some offsets etc.    // Screen = the space that we're looking at.    protected LatLonPoint uCtr;    protected float uCtrLat; // User Center in lat/lon    protected float uCtrLon;    protected int sCtrX; // Screen Origin in pixels (center=0,0)    protected int sCtrY; //     protected int uCtrX; // User Origin in pixels    protected int uCtrY; // 0,0 = lat/lon center    protected int dUSX; // delta between U and S, X axis    protected int dUSY; // delta between U and S, Y axis    /**     * Construct a MercatorView projection.     *      * @param center LatLonPoint center of projection     * @param scale float scale of projection     * @param width width of screen     * @param height height of screen     */    public MercatorView(LatLonPoint center, float scale, int width, int height) {        super(center, scale, width, height, MercatorViewType);        computeParameters();    }    /**     * Return stringified description of this projection.     *      * @return String     * @see Projection#getProjectionID     */    public String toString() {        return "MercatorView[" + super.toString();    }    /**     * Called when some fundamental parameters change.     * <p>     * Each projection will decide how to respond to this change. For     * instance, they may need to recalculate "constant" paramters     * used in the forward() and inverse() calls.     * <p>     */    protected void computeParameters() {        Debug.message("mercatorview", "MercatorView.computeParameters()");        // We have no way of constructing the User Space at anything        // other than 0,0 for now.        if (uCtr == null) {            uCtrLat = (float) 0.0;            uCtrLon = (float) 0.0;            uCtr = new LatLonPoint(uCtrLat, uCtrLon);        }        if (helper == null) {            helper = new MercatorViewHelper(uCtr, scale, width, height);        }        synchronized (helper) {            super.computeParameters();            // Screen stuff            Point temp = new Point();            helper.setAllParams(pixelsPerMeter,                    planetRadius,                    planetPixelRadius,                    planetPixelCircumference,                    minscale,                    maxscale,                    scale,                    scaled_radius,                    width,                    height,                    uCtrLat,                    uCtrLon);            helper.forward(ctrLat, ctrLon, temp, true);            sCtrX = temp.x;            sCtrY = temp.y;            helper.forward(uCtrLat, uCtrLon, temp);            uCtrX = temp.x;            uCtrY = temp.y;            dUSX = sCtrX - uCtrX;            dUSY = sCtrY - uCtrY;        }        Debug.message("mercatorview", "User Center LL: " + uCtrLon + ","                + uCtrLat + " User Center xy: " + uCtrX + "," + uCtrY                + " Screen Center LL: " + ProjMath.radToDeg(ctrLon) + ","                + ProjMath.radToDeg(ctrLat) + " Screen Center xy: " + sCtrX                + "," + sCtrY + " Screen wh: " + width + "x" + height                + " Screen halfwh: " + this.wx + "x" + this.hy + " Delta xy: "                + dUSX + "," + dUSY);    }    /**     * Projects a point from Lat/Lon space to X/Y space.     *      * @param pt LatLonPoint     * @param p Point retval     * @return Point p     */    public Point forward(LatLonPoint pt, Point p) {        helper.forward(pt, p);        Debug.message("mercatorview-f", "forward llp,p: " + pt.getLongitude()                + "," + pt.getLatitude() + " merc xy: " + p.x + "," + p.y);        p.x = p.x + wx - dUSX;        p.y = this.hy - p.y + dUSY;        Debug.message("mercatorview-f", "forward llp,p: " + pt.getLongitude()                + "," + pt.getLatitude() + " view xy: " + p.x + "," + p.y);        return p;    }    /**     * Forward projects a lat,lon coordinates.     *      * @param lat raw latitude in decimal degrees     * @param lon raw longitude in decimal degrees     * @param p Resulting XY Point     * @return Point p     */    public Point forward(float lat, float lon, Point p) {        helper.forward(lat, lon, p);        Debug.message("mercatorview-f", "forward l,l,p: " + lon + "," + lat                + " merc xy: " + p.x + "," + p.y);        p.x = p.x + wx - dUSX;        p.y = this.hy - p.y + dUSY;        Debug.message("mercatorview-f", "forward l,l,p: " + lon + "," + lat                + " view xy: " + p.x + "," + p.y);        return p;    }    /**     * Forward projects lat,lon into XY space and returns a Point.     *      * @param lat float latitude in radians     * @param lon float longitude in radians     * @param p Resulting XY Point     * @param isRadian bogus argument indicating that lat,lon     *        arguments are in radians     * @return Point p     */    public Point forward(float lat, float lon, Point p, boolean isRadian) {        helper.forward(lat, lon, p, isRadian);        Debug.message("mercatorview-f", "forward l,l,p,i: "                + ProjMath.radToDeg(lon) + "," + ProjMath.radToDeg(lat)                + " merc xy: " + p.x + "," + p.y);        p.x = p.x + wx - dUSX;        p.y = this.hy - p.y + dUSY;        Debug.message("mercatorview-f", "forward l,l,p,i: "                + ProjMath.radToDeg(lon) + "," + ProjMath.radToDeg(lat)                + " view xy: " + p.x + "," + p.y);        return p;    }    /**     * Inverse project a Point.     *      * @param pt x,y Point     * @param llp resulting LatLonPoint     * @return LatLonPoint llp     */    public LatLonPoint inverse(Point pt, LatLonPoint llp) {        // convert from screen to user coordinates        int x = pt.x - wx + dUSX;        int y = this.hy - pt.y + dUSY;        Debug.message("mercatorview-i", "pt: " + pt.x + "," + pt.y + "xy: " + x                + "," + y);        return (helper.inverse(x, y, llp));    }    /**     * Inverse project x,y coordinates into a LatLonPoint.     *      * @param x integer x coordinate     * @param y integer y coordinate     * @param llp LatLonPoint     * @return LatLonPoint llp     * @see Proj#inverse(Point)     */    public LatLonPoint inverse(int x, int y, LatLonPoint llp) {        // convert from screen to world coordinates        int tx = x - wx + dUSX;        int ty = this.hy - y + dUSY;        // This is only to aid printing....        LatLonPoint tllp = helper.inverse(tx, ty, llp);        Debug.message("mercatorview-i", "xy: " + x + "," + y + " txty: " + tx                + "," + ty + " llp: " + tllp.getLongitude() + ","                + tllp.getLatitude());        return (helper.inverse(tx, ty, llp));    }    /**     * MercatorViewHelper     *      * This will hold the "USER" space version of the Mercator The     * forward and inverse methods are extended here to undo the     * screen coordinate conversions (i.e this helper deals in user     * space while its "super" deals in what it thinks is screen     * space.     *       */    private class MercatorViewHelper extends Mercator {        /**         * MercatorViewHelper Constructor         *          * @param center the center of the projection into "user         *        space"         * @param scale the scale of the projection         * @param width the width of the projection into user space         * @param height the height of the projection into user space         */        public MercatorViewHelper(LatLonPoint center, float scale, int width,                int height) {            super(center, scale, width, height, MercatorType);        }        public void setAllParams(int hPixelsPerMeter, float hPlanetRadius,                                 float hPlanetPixelRadius,                                 float hPlanetPixelCircumference,                                 float hMinscale, float hMaxscale,                                 float hScale, float hScaled_radius,                                 int hWidth, int hHeight, float hCtrLat,                                 float hCtrLon) {            this.pixelsPerMeter = hPixelsPerMeter;            this.planetRadius = hPlanetRadius;            this.planetPixelRadius = hPlanetPixelRadius;            this.planetPixelCircumference = hPlanetPixelCircumference;            this.minscale = hMinscale;            this.maxscale = hMaxscale;            this.scale = hScale;            this.scaled_radius = hScaled_radius;            this.width = hWidth;            this.height = hHeight;            this.ctrLat = hCtrLat;            this.ctrLon = hCtrLon;            this.computeParameters();        }        public String toString() {            return "MercatorViewHelper[" + super.toString();        }        /**          */        public Point forward(LatLonPoint pt, Point p) {            super.forward(pt, p);            Debug.message("mercatorview-f", "forward l,l,p: "                    + pt.getLongitude() + "," + pt.getLatitude() + " help xy: "                    + p.x + "," + p.y);            p.x = p.x - this.wx;            p.y = this.hy - p.y;            return p;        }        public Point forward(float lat, float lon, Point p) {            super.forward(lat, lon, p);            Debug.message("mercatorview-f", "forward l,l,p: " + lon + "," + lat                    + " help xy: " + p.x + "," + p.y);            p.x = p.x - this.wx;            p.y = this.hy - p.y;            return p;        }        public Point forward(float lat, float lon, Point p, boolean isRadian) {            super.forward(lat, lon, p, isRadian);            Debug.message("mercatorview-f", "forward l,l,p: "                    + ProjMath.radToDeg(lon) + "," + ProjMath.radToDeg(lat)                    + " help xy: " + p.x + "," + p.y);            p.x = p.x - this.wx;            p.y = this.hy - p.y;            return p;        }        public LatLonPoint inverse(Point pt, LatLonPoint llp) {            int x = pt.x + this.wx;            int y = this.hy - pt.y;            return (super.inverse(x, y, llp));        }        public LatLonPoint inverse(int x, int y, LatLonPoint llp) {            x = x + this.wx;            y = this.hy - y;            return (super.inverse(x, y, llp));        }    }}