// Copyright 1997, Joseph Bergin.  All rights reserved.  
// Updated 2002 for Java 2

import symantec.itools.awt.WrappingLabel;
import java.awt.*;
import java.applet.*;
import java.awt.event.*;

public class StabilityCalculator extends Applet 
{
	public void init() 
	{	super.init();

		setLayout(null);
		resize(560,310);
		Color paleYellow = new Color(16777171);
		Font timesRoman10 = new Font("TimesRoman", Font.PLAIN, 10);
		Font dialog14 = new Font("Dialog", Font.PLAIN, 14);
		setBackground(paleYellow);
		xMissles = new TextField();
		xMissles.setText("200");
		xMissles.setBounds(105,94,35,28);
	//	xMissles.setBackground(new Color(16777215));
		add(xMissles);
		yMissles = new TextField();
		yMissles.setText("150");
		yMissles.setBounds(105,140,35,28);
	//	yMissles.setBackground(new Color(16777215));
		add(yMissles);
		xWarheads = new TextField();
		xWarheads.setText("1");
		xWarheads.setBounds(160,94,30,28);
	//	xWarheads.setBackground(new Color(16777215));
		add(xWarheads);
		yWarheads = new TextField();
		yWarheads.setText("3");
		yWarheads.setBounds(160,140,30,28);
	//	yWarheads.setBackground(new Color(16777215));
		add(yWarheads);
		xTotalWarheads = new TextField();
		xTotalWarheads.setEnabled(false);
		xTotalWarheads.setBounds(206,94,44,28);
		xTotalWarheads.setBackground(paleYellow);
		add(xTotalWarheads);
		yTotalWarheads = new TextField();
		yTotalWarheads.setEnabled(false);
		yTotalWarheads.setBounds(206,140,44,28);
		yTotalWarheads.setBackground(paleYellow);
		add(yTotalWarheads);
		xKillProb = new TextField();
		xKillProb.setText(".9");
		xKillProb.setBounds(266,94,30,28);
	//	xKillProb.setBackground(new Color(16777215));
		add(xKillProb);
		yKillProb = new TextField();
		yKillProb.setText(".8");
		yKillProb.setBounds(267,140,30,28);
	//	yKillProb.setBackground(new Color(16777215));
		add(yKillProb);
		xFirstStrike = new TextField();
		xFirstStrike.setEnabled(false);
		xFirstStrike.setBounds(324,94,96,28);
		xFirstStrike.setBackground(paleYellow);
		add(xFirstStrike);
		yFirstStrike = new TextField();
		yFirstStrike.setEnabled(false);
		yFirstStrike.setBounds(325,140,96,28);
		yFirstStrike.setBackground(paleYellow);
		add(yFirstStrike);
		threshold = new TextField();
		threshold.setText("0.5");
		threshold.setBounds(464,113,56,28);
	//	threshold.setBackground(new Color(16777215));
		add(threshold);
		calculate = new Button("Calculate");
		calculate.addActionListener(new CalculateListener());
		calculate.setBounds(72,210,86,34);
	//	calculate.setBackground(new Color(16777215));
		add(calculate);
		label1 = new Label("X");
		label1.setBounds(70,97,23,21);
		label1.setFont(dialog14);
		add(label1);
		label2 = new Label("Y");
		label2.setBounds(69,144,23,21);
		label2.setFont(dialog14);
		add(label2);
		label3 = new Label("Missles");
		label3.setBounds(102,73,43,21);
		label3.setFont(timesRoman10);
		add(label3);
		label8 = new Label("Stability Threshold");
		label8.setBounds(450,87,90,21);
		label8.setFont(timesRoman10);
		add(label8);
		
		wrappingLabel1 = new symantec.itools.awt.WrappingLabel();
		wrappingLabel1.setText("Warheads  per  Missle");
		wrappingLabel1.setBounds(154,58,50,38);
		wrappingLabel1.setFont(timesRoman10);
		add(wrappingLabel1);
		wrappingLabel2 = new symantec.itools.awt.WrappingLabel();
		wrappingLabel2.setText("Total Warheads");
		wrappingLabel2.setBounds(208,58,49,38);
		wrappingLabel2.setFont(timesRoman10);
		add(wrappingLabel2);
		wrappingLabel3 = new symantec.itools.awt.WrappingLabel();
		wrappingLabel3.setText("Kill Probability per Warhead");
		wrappingLabel3.setBounds(262,46,58,48);
		wrappingLabel3.setFont(timesRoman10);
		add(wrappingLabel3);
		wrappingLabel4 = new symantec.itools.awt.WrappingLabel();
		wrappingLabel4.setText("Probability of Successful First Strike");
		wrappingLabel4.setBounds(334,46,70,48);
		wrappingLabel4.setFont(timesRoman10);
		add(wrappingLabel4);
		
		Stability = new java.awt.TextField();
		Stability.setEnabled(false);
		Stability.setBounds(290,205,116,38);
		Stability.setFont(new Font("Dialog", Font.BOLD|Font.ITALIC, 18));
		Stability.setBackground(paleYellow);
		add(Stability);
		label4 = new Label("Stability Calculator");
		label4.setBounds(10,1,276,53);
		label4.setFont(new Font("Dialog", Font.PLAIN, 24));
		add(label4);
	}
	
	private class CalculateListener implements ActionListener
	{
		public void actionPerformed(ActionEvent e)
		{	calculate_Clicked();
		}
	}

	private TextField xMissles;
	private TextField yMissles;
	private TextField xWarheads;
	private TextField yWarheads;
	private TextField xTotalWarheads;
	private TextField yTotalWarheads;
	private TextField xKillProb;
	private TextField yKillProb;
	private TextField xFirstStrike;
	private TextField yFirstStrike;
	private TextField threshold;
	private Button calculate;
	private Label label1;
	private Label label2;
	private Label label3;
	private Label label8;
	private symantec.itools.awt.WrappingLabel wrappingLabel1;
	private symantec.itools.awt.WrappingLabel wrappingLabel2;
	private symantec.itools.awt.WrappingLabel wrappingLabel3;
	private symantec.itools.awt.WrappingLabel wrappingLabel4;
	private TextField Stability;
	private Label label4;

	void calculate_Clicked() 
	{	int xw = Integer.valueOf(xWarheads.getText()).intValue(),
			yw = Integer.valueOf(yWarheads.getText()).intValue(), 
			xm = Integer.valueOf(xMissles.getText()).intValue(),
			ym = Integer.valueOf(yMissles.getText()).intValue();
		int xwarheads = xm*xw;
		int ywarheads = ym*yw;
			
		float	t = Float.valueOf(threshold.getText()).floatValue(),
				xk = Float.valueOf(xKillProb.getText()).floatValue(),
				yk = Float.valueOf(yKillProb.getText()).floatValue();
		if (xk > 1.0) // Sanity checks
		{	xk = (float)1.0;
			xKillProb.setText("1.0");
		}
		if (xk < 0.0)		
		{	xk = (float)0.0;
			xKillProb.setText("0.0");
		}		
		if (yk > 1.0)
		{	yk = (float)1.0;
			yKillProb.setText("1.0");
		}
		if (yk < 0.0)		
		{	yk = (float)0.0;		
			yKillProb.setText("0.0");
		}				
		float	xfs = (float)Math.pow(1.0 - Math.pow(1.0 - xk, (float)(xwarheads)/(float)(ym)),  (float)(ym)),
				yfs = (float)Math.pow(1.0 - Math.pow(1.0 - yk, (float)(ywarheads)/(float)(xm)),  (float)(xm));
		// Formula fails if kill probability == 1.0.
		if(xfs < .001) xfs = (float)0.0;
		if(yfs < .001) yfs = (float)0.0;
		xTotalWarheads.setText(""+xwarheads);
		yTotalWarheads.setText(""+ywarheads);
		if(xwarheads < ym) // Adjust in case kill probablility == 1. 
			xfs = (float)0.0;
		xFirstStrike.setText(""+xfs);
		if(ywarheads < xm)
			yfs = (float)0.0;
		yFirstStrike.setText(""+yfs);
		if(xfs < t && yfs < t)
			Stability.setText("Stable");
		else
			Stability.setText("Unstable");		
	}
}