mgrscoordpanel.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/gui/MGRSCoordPanel.java,v $
// $RCSfile: MGRSCoordPanel.java,v $
// $Revision: 1.3.2.3 $
// $Date: 2005/08/09 17:59:30 $
// $Author: dietrick $
// 
// **********************************************************************

package com.bbn.openmap.gui;

import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.io.Serializable;

import javax.swing.*;
import javax.swing.border.*;

import com.bbn.openmap.LatLonPoint;
import com.bbn.openmap.event.CenterSupport;
import com.bbn.openmap.proj.coords.MGRSPoint;

/**
 * MGRSCoordPanel is a simple gui with an entry box for a MGRS
 * coordinate. It sets the center of a map by firing CenterEvents.
 */
public class MGRSCoordPanel extends CoordPanel implements Serializable {

    protected transient JTextField mgrs;

    /**
     * Creates the panel.
     */
    public MGRSCoordPanel() {
        super();
    }

    /**
     * Creates the panel.
     */
    public MGRSCoordPanel(CenterSupport support) {
        super(support);
    }

    /**
     * Creates and adds the labels and entry fields for latitude and
     * longitude
     */
    protected void makeWidgets() {
        String locText;
        GridBagLayout gridbag = new GridBagLayout();
        GridBagConstraints c = new GridBagConstraints();

        setLayout(gridbag);
        locText = i18n.get(MGRSCoordPanel.class, "border", "MGRS Coordinate");
        setBorder(new TitledBorder(new EtchedBorder(), locText));

        locText = i18n.get(MGRSCoordPanel.class, "mgrsLabel", "MGRS: ");
        JLabel mgrsLabel = new JLabel(locText);
        c.gridx = 0;
        gridbag.setConstraints(mgrsLabel, c);
        add(mgrsLabel);

        mgrs = new JTextField(20);
        c.gridx = 1;
        gridbag.setConstraints(mgrs, c);
        add(mgrs);
    }

    /**
     * @return the LatLonPoint represented by contents of the entry
     *         boxes
     */
    public LatLonPoint getLatLon() {

        try {
            // Allow blank minutes and seconds fields to represent zero
            return new MGRSPoint(mgrs.getText()).toLatLonPoint();

        } catch (NumberFormatException except) {
            //  	    System.out.println(except.toString());
            clearTextBoxes();
        }
        return null;
    }

    /**
     * Sets the contents of the latitude and longitude entry boxes
     * 
     * @param llpoint the object containing the coordinates that
     *        should go in the boxes.
     */
    public void setLatLon(LatLonPoint llpoint) {
        if (llpoint == null) {
            clearTextBoxes();
            return;
        }

        MGRSPoint mgrsp = new MGRSPoint(llpoint);
        mgrs.setText(mgrsp.getMGRS());
    }

    protected void clearTextBoxes() {
        mgrs.setText("");
    }
}