basiclocation.java

openmap java写的开源数字地图程序. 用applet实现,可以像google map 那样放大缩小地图.

// **********************************************************************
// 
// <copyright>
// 
//  BBN Technologies
//  10 Moulton Street
//  Cambridge, MA 02138
//  [phone]
// 
//  Copyright (C) BBNT Solutions LLC. All rights reserved.
// 
// </copyright>
// **********************************************************************
// 
// $Source: /cvs/distapps/openmap/src/openmap/com/bbn/openmap/layer/location/BasicLocation.java,v $
// $RCSfile: BasicLocation.java,v $
// $Revision: 1.2.2.1 $
// $Date: 2004/10/14 18:27:09 $
// $Author: dietrick $
// 
// **********************************************************************

package com.bbn.openmap.layer.location;

/*  OpenMap  */
import com.bbn.openmap.omGraphics.OMRect;
import com.bbn.openmap.omGraphics.OMGraphic;

/**
 * A BasicLocation the standard Location - dot for the marker, text to
 * the right of the dot. Other graphics can be substituted for the
 * dot, but you should modify the setGraphicLocations methods
 * accordingly.
 */
public class BasicLocation extends Location {

    /**
     * A plain constructor if you are planning on setting everything
     * yourself.
     */
    public BasicLocation() {}

    /**
     * Create a location at a latitude/longitude. If the
     * locationMarker is null, a small rectangle (dot) will be created
     * to mark the location.
     * 
     * @param latitude the latitude, in decimal degrees, of the
     *        location.
     * @param longitude the longitude, in decimal degrees, of the
     *        location.
     * @param name the name of the location, also used in the label.
     * @param locationMarker the OMGraphic to use for the location
     *        mark.
     */
    public BasicLocation(float latitude, float longitude, String name,
            OMGraphic locationMarker) {
        super(latitude, longitude, name, locationMarker);
    }

    /**
     * Create a location at a map location. If the locationMarker is
     * null, a small rectangle (dot) will be created to mark the
     * location.
     * 
     * @param x the pixel location of the object from the let of the
     *        map.
     * @param y the pixel location of the object from the top of the
     *        map
     * @param name the name of the location, also used in the label.
     * @param locationMarker the OMGraphic to use for the location
     *        mark.
     */
    public BasicLocation(int x, int y, String name, OMGraphic locationMarker) {
        super(x, y, name, locationMarker);
    }

    /**
     * Create a location at a pixel offset from a latitude/longitude.
     * If the locationMarker is null, a small rectangle (dot) will be
     * created to mark the location.
     * 
     * @param latitude the latitude, in decimal degrees, of the
     *        location.
     * @param longitude the longitude, in decimal degrees, of the
     *        location.
     * @param xOffset the pixel location of the object from the
     *        longitude.
     * @param yOffset the pixel location of the object from the
     *        latitude.
     * @param name the name of the location, also used in the label.
     * @param locationMarker the OMGraphic to use for the location
     *        mark.
     */
    public BasicLocation(float latitude, float longitude, int xOffset,
            int yOffset, String name, OMGraphic locationMarker) {
        super(latitude, longitude, xOffset, yOffset, name, locationMarker);
    }

    /**
     * Called by setLocations(). Assumes the dot for the location
     * marker, and a text object as the label, stored to the right.
     */
    public void setGraphicLocations(float latitude, float longitude) {
        if (location instanceof OMRect) {
            ((OMRect) location).setLocation(latitude, longitude, -1, -1, 1, 1);
        }
        label.setLat(latitude);
        label.setLon(longitude);
    }

    /**
     * Called by setLocations(). Assumes the dot for the location
     * marker, and a text object as the label, stored to the right.
     */
    public void setGraphicLocations(int x, int y) {
        if (location instanceof OMRect) {
            ((OMRect) location).setLocation(x - 1, y - 1, x + 1, y + 1);
        }
        label.setX(x);
        label.setY(y);
    }

    /**
     * Called by setLocations(). Assumes the dot for the location
     * marker, and a text object as the label, stored to the right.
     */
    public void setGraphicLocations(float latitude, float longitude,
                                    int offsetX, int offsetY) {
        if (location instanceof OMRect) {
            ((OMRect) location).setLocation(latitude,
                    longitude,
                    offsetX - 1,
                    offsetY - 1,
                    offsetX + 1,
                    offsetY + 1);
        }

        label.setLat(latitude);
        label.setLon(longitude);
        label.setX(offsetX);
        label.setY(offsetY);
    }
}