/**
 * DegreeEntryPanel provides a data entry panel for Latitude and Longitude.
 * It is always expressed by a subclass (LatitudeField or LongitudeField)<p>
 *
 * Copyright &copy; 1998-89 Martin Minow. All Rights Reserved.<p>
 *
 * Permission to use, copy, modify, and redistribute this software and its
 * documentation for personal, non-commercial use is hereby granted provided that
 * this copyright notice and appropriate documentation appears in all copies. This
 * software may not be distributed for fee or as part of commercial, "shareware,"
 * and/or not-for-profit endevors including, but not limited to, CD-ROM collections,
 * online databases, and subscription services without specific license.<p>
 *
 * Based on DateGUI.java in Mastering JavaBeans.
 * @see <a href="http://www.sybase.com">Sybase</a>, click on
 *  "Catalog>Updates>Mastering JavaBeans".
 * @author <a href="mailto:minow@pobox.com">Martin Minow</a>
 * @version 1.0a0
 * Set tabs every 8 characters.
 */
package org.minow.applets.sunsphere;
import java.beans.*;
import java.util.*;
import java.awt.*;
import java.awt.event.*;
import java.text.*;

public class DegreeEntryPanel extends Panel
{
    /*
     * These are the property events we distribute.
     */
    public static final String DEGREE_CHANGE	= "degree";
    private static final char	degreeSign	= '\u00B0';	// 'd';
    private static final char	minuteSign	= '\'';		// 'm';
    private static final char	secondSign	= '"';		// 's';

    protected IntegerField	degreeField;
    protected IntegerField	minuteField;
    protected IntegerField	secondField;
    protected Checkbox		northEastCheck;
    
    private double		value;
    
    public DegreeEntryPanel()
    {
	this(0.0, 360, "East");
    }
    public DegreeEntryPanel(
    	    double		value,
    	    int			maximum,
	    String		checkBoxLabel
	)
    {
        /*
         * Since maximum will be 90 or 360, a clever user can
         * conceivably set the value just beyond the true maximum.
         * Note also that longitude > 180 is valid, as is longitude < 0
         */
	degreeField	= new IntegerField(3, 0, 0, maximum);
	minuteField	= new IntegerField(2, 0, 0, 59);
	secondField	= new IntegerField(2, 0, 0, 59);
	northEastCheck	= new Checkbox(checkBoxLabel);
	/*
	 * Construct the display Panel.
	 */
	GridBagLayout gridbag	= new GridBagLayout();
	setLayout(gridbag);
	GridBagConstraints c	= new GridBagConstraints();
	c.gridy			= 0;
	c.weightx		= 0.0;
	c.anchor		= GridBagConstraints.WEST;
	c.fill			= GridBagConstraints.NONE;
	addField(c, degreeField);
	addField(c, new Label("\u00B0"));	/* Degree mark  */
	addField(c, minuteField);
	addField(c, new Label("'"));
	addField(c, secondField);
	addField(c, new Label("\""));
	addField(c, northEastCheck);		
	setValue(Utility.MOD(value + 180.0, 360.0) - 180.0);
    }
    private void addField(
	    GridBagConstraints	c,
	    Component			component
	)
    {
	add(component);
	((GridBagLayout) getLayout()).setConstraints(component, c);
    }
    /*
     * Accessor functions.
     */
    public synchronized void setValue(
	    double		value
	)
    {
    	this.value		= value;
	int seconds	    	= (int) Math.round(value * 3600.0);
	boolean isPositive	= (seconds >= 0.0);
	seconds		   	 = Math.abs(seconds);
	int degrees	   	= seconds / 3600;
	seconds			-= (degrees * 3600);
	int minutes		= seconds / 60;
	seconds			-= (minutes * 60);
	degreeField.setText(String.valueOf(degrees));
	minuteField.setText(String.valueOf(minutes));
	secondField.setText(String.valueOf(seconds));
	northEastCheck.setState(isPositive);
    }
    public synchronized double getValue()
    {
	try {
	    long seconds	= Integer.parseInt(secondField.getText());
	    long minutes	= Integer.parseInt(minuteField.getText());
	    long degrees	= Integer.parseInt(degreeField.getText());
	    value		=
	    	((double) degrees)
	    	+ (((double) minutes) / 60.0)
	    	+ (((double) seconds) / 3600.0);
	}
	catch (NumberFormatException e) { }
	return (value);
    }
}