/******************************************************************************
 * Created by Kenneth A. Lee (Ken.Lee@KennethLee.org)
 *
 * You may use this code in any project as long as credit is given to Kenneth Lee.
 *
 * Copyright 2003, All Rights Reserved
 *
 ******************************************************************************/
import java.applet.*;
import java.lang.Math;

public class GreatCircle extends Applet {
	public double ALatHours;
	public double ALatMinutes;
	public double ALatSeconds;
	public double ALongHours;
	public double ALongMinutes;
	public double ALongSeconds;
	public double BLatHours;
	public double BLatMinutes;
	public double BLatSeconds;
	public double BLongHours;
	public double BLongMinutes;
	public double BLongSeconds;
	public double l1;
	public double n1;
	public double l2;
	public double n2;
	public double c;
	public double a;
	public double d;
	public double r;
	public String sTest;

	/*
	 * Default Constructor
	 */
	public GreatCircle() {}


	/*
	 * Init Method for applet
	 */
	public void init() {
		ALatHours    = 0.0D;
		ALatMinutes  = 0.0D;
		ALatSeconds  = 0.0D;
		ALongHours   = 0.0D;
		ALongMinutes = 0.0D;
		ALongSeconds = 0.0D;
		BLatHours    = 0.0D;
		BLatMinutes  = 0.0D;
		BLatSeconds  = 0.0D;
		BLongHours   = 0.0D;
		BLongMinutes = 0.0D;
		BLongSeconds = 0.0D;
		l1           = 0.0D;
		n1           = 0.0D;
		l2           = 0.0D;
		n2           = 0.0D;
		c            = 0.0D;
		a            = 0.0D;
		d            = 0.0D;
		r            = 3963.0D;
	}

	/*
	 * Method that solves problem
	 */
	public void solveit() {
		l1 = ALatHours + ALatMinutes/60.0 + ALatSeconds/3600.0;
		n1 = ALongHours + ALongMinutes/60.0 + ALongSeconds/3600.0;
		l2 = BLatHours + BLatMinutes/60.0 + BLatSeconds/3600.0;
		n2 = BLongHours + BLongMinutes/60.0 + BLongSeconds/3600.0;

		// Convert to radians
		l1 = l1*Math.PI/180;
		n1 = n1*Math.PI/180;
		l2 = l2*Math.PI/180;
		n2 = n2*Math.PI/180;

		c = ((Math.sin(l1))*(Math.sin(l2))) + ((Math.cos(l1))*(Math.cos(l2))*(Math.cos(n2 - n1)));
		a = Math.acos(c);  // in radians
		d = this.a * r;
	}

	/*
	 * Getters
	 */
	public String getDistance() {
		// return Double.toString(solveit());
		// double junk = solveit();
		// return "l1:" + l1 + " n1:" + n1 + " l2:" + l2 + " n2:" + n2 + " c:" + c + " a:" + a + " d:" + d + " r:" + r;
		// return String.valueOf(solveit());
		solveit();
		return String.valueOf(d);
	}

	public String getALatHours() {
		return String.valueOf(ALatHours);
	}

	public String getALatMinutes() {
		return String.valueOf(ALatMinutes);
	}

	public String getALatSeconds() {
		return String.valueOf(ALatSeconds);
	}

	public String getALongHours() {
		return String.valueOf(ALongHours);
	}

	public String getALongMinutes() {
		return String.valueOf(ALongMinutes);
	}

	public String getALongSeconds() {
		return String.valueOf(ALongSeconds);
	}

	public String getBLatHours() {
		return String.valueOf(BLatHours);
	}

	public String getBLatMinutes() {
		return String.valueOf(BLatMinutes);
	}

	public String getBLatSeconds() {
		return String.valueOf(BLatSeconds);
	}

	public String getBLongHours() {
		return String.valueOf(BLongHours);
	}

	public String getBLongMinutes() {
		return String.valueOf(BLongMinutes);
	}

	public String getBLongSeconds() {
		return String.valueOf(BLongSeconds);
	}

	public String getl1() {
		return String.valueOf(l1);
	}

	public String getn1() {
		return String.valueOf(n1);
	}

	public String getl2() {
		return String.valueOf(l2);
	}

	public String getn2() {
		return String.valueOf(n2);
	}

	public String getc() {
		return String.valueOf(c);
	}

	public String geta() {
		return String.valueOf(a);
	}

	public String getd() {
		return String.valueOf(d);
	}

	public String getr() {
		return String.valueOf(r);
	}


	/*
	 * Setters - Type Float is received from javascript.
	 */
	public void setALatHours(double bValue) {
		ALatHours = bValue;
	}

	public void setALatHours(float bValue) {
		ALatHours = (double) bValue;
	}

	public void setALatMinutes(double bValue) {
		ALatMinutes = bValue;
	}

	public void setALatMinutes(float bValue) {
		ALatMinutes = (double) bValue;
	}

	public void setALatSeconds(double bValue) {
		ALatSeconds = bValue;
	}

	public void setALatSeconds(float bValue) {
		ALatSeconds = (double) bValue;
	}

	public void setALongHours(double bValue) {
		ALongHours = bValue;
	}

	public void setALongHours(float bValue) {
		ALongHours = (double) bValue;
	}

	public void setALongMinutes(double bValue) {
		ALongMinutes = bValue;
	}

	public void setALongMinutes(float bValue) {
		ALongMinutes = (double) bValue;
	}

	public void setALongSeconds(double bValue) {
		ALongSeconds = bValue;
	}

	public void setALongSeconds(float bValue) {
		ALongSeconds = (double) bValue;
	}

	public void setBLatHours(double bValue) {
		BLatHours = bValue;
	}

	public void setBLatHours(float bValue) {
		BLatHours = (double) bValue;
	}

	public void setBLatMinutes(double bValue) {
		BLatMinutes = bValue;
	}

	public void setBLatMinutes(float bValue) {
		BLatMinutes = (double) bValue;
	}

	public void setBLatSeconds(double bValue) {
		BLatSeconds = bValue;
	}

	public void setBLatSeconds(float bValue) {
		BLatSeconds = (double) bValue;
	}

	public void setBLongHours(double bValue) {
		BLongHours = bValue;
	}

	public void setBLongHours(float bValue) {
		BLongHours = (double) bValue;
	}

	public void setBLongMinutes(double bValue) {
		BLongMinutes = bValue;
	}

	public void setBLongMinutes(float bValue) {
		BLongMinutes = (double) bValue;
	}

	public void setBLongSeconds(double bValue) {
		BLongSeconds = bValue;
	}

	public void setBLongSeconds(float bValue) {
		BLongSeconds = (double) bValue;
	}

	/*
	 * Testing method
	 */
	public static void main(String[] args) {
	 	GreatCircle gc = new GreatCircle();
	 	gc.init();

		gc.ALatHours    = 42;

		gc.ALongHours   = 87;
		gc.ALongMinutes = 55;


		gc.BLatHours    = 21;
		gc.BLatMinutes  = 20;

		gc.BLongHours   = 157;
		gc.BLongMinutes = 55;

		gc.solveit();
		System.out.println("Total distance = " + gc.d);
	}
}