// Multimedia Physics TrueFalse Applet
// Gary D. Westfall
// October, 1996
import java.awt.*;
import java.lang.*;
import java.util.*;
import java.applet.*;
import java.net.*;
import java.io.*;

public class TrueFalse extends Applet {
	TFCon controls;
	String param;
	TFCanv c;
	public void init() {
		int i;
		setBackground(Color.white);
		setLayout(new GridLayout(1,3));
		c = new TFCanv();
		add(controls=new TFCon(getParameter("tf"),c));
		add(c);
	}
	public void start() {
		controls.enable();
	}
	public void stop() {
		controls.disable();
		System.gc(); // Force garbage collection
	}	
	public boolean handleEvent(Event e) {
		if (e.id == Event.WINDOW_DESTROY) {
	    	stop();
	    	destroy();
	 		return true;
		}
		return super.handleEvent(e);
	}
}
class TFCanv extends Canvas {
	String replyString;
	Color replyColor;
	public TFCanv(){
	}               
	public void paint(Graphics g) {
		Font myFont=new Font("TimesRoman",Font.PLAIN,14);
		g.setFont(myFont);
		g.setColor(replyColor);
		if(replyString!=null) {
			g.drawString(replyString,0,21);
		}
	}
	public void redraw(String myString,int myColor) {
		replyString=myString;
		if(myColor==1) {
			replyColor=Color.green;
		}
		if(myColor==2) {
			replyColor=Color.red;
		}
		repaint();
	}
}

class TFCon extends Panel {
	Checkbox radioButton1;
	CheckboxGroup Group1;
	Checkbox radioButton2;
	String tfValueLocal;
	TFCanv canvas;
	
	public TFCon(String tfValue,TFCanv canvasLocal) {
		canvas=canvasLocal;
		tfValueLocal=tfValue;
		Font myFont=new Font("TimesRoman",Font.PLAIN,14);
		Group1 = new CheckboxGroup();
		radioButton1 = new java.awt.Checkbox("True", Group1, false);
		radioButton1.setFont(myFont);
		add(radioButton1);
		radioButton2 = new java.awt.Checkbox("False", Group1, false);
		radioButton2.setFont(myFont);
		add(radioButton2);
	}
	
	public boolean handleEvent(Event event) {
		if (event.target == radioButton1 && event.id == Event.ACTION_EVENT) {
			radioButton1_Action(event);
		}
		if (event.target == radioButton2 && event.id == Event.ACTION_EVENT) {
			radioButton2_Action(event);
		}
		return super.handleEvent(event);
	}

	void radioButton1_Action(Event event) {
		if(tfValueLocal.equals("T")) {
			canvas.redraw("Excellent, that is correct",1);
		} else {
			canvas.redraw("Sorry, that is not correct",2);
		}
	}

	void radioButton2_Action(Event event) {
		if(tfValueLocal.equals("F")) {
			canvas.redraw("Excellent, that is correct",1);
		} else {
			canvas.redraw("Sorry, that is not correct",2);
		}
	}
}