//TrafficLight.java
//needs WindowDestroyer.java

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;


public class TrafficLight extends JFrame implements ItemListener
{
	private JRadioButton bRed, bYellow, bGreen;
	private ButtonGroup bGroup = new ButtonGroup();
	private TLPanel tlpan = new TLPanel();


	public static void main(String[] args)
	{
		TrafficLight lt = new TrafficLight();
		lt.setSize(200, 400);
		lt.show(); 

	}//end main

	public TrafficLight()
	{
		setTitle("Traffic Light");
		addWindowListener(new WindowDestroyer());
		JPanel lPanel = new JPanel();
		lPanel.setSize(100, 300);
		lPanel.setLayout(new FlowLayout(FlowLayout.CENTER));
		
		lPanel.add(tlpan);
		
		JPanel toggleBP = new JPanel();
		toggleBP.setLayout(new FlowLayout());
		toggleBP.add(bRed = new JRadioButton("Red", false));
		toggleBP.add(bYellow = new JRadioButton("Yellow", false) );
		toggleBP.add(bGreen = new JRadioButton("Green", false));
		
		bGroup.add(bRed);
		bGroup.add(bYellow);
		bGroup.add(bGreen);

		getContentPane().setLayout(new BorderLayout());
		getContentPane().add(lPanel, BorderLayout.CENTER);
		getContentPane().add(toggleBP, BorderLayout.NORTH);

		bRed.addItemListener(this);
		bYellow.addItemListener(this);
		bGreen.addItemListener(this);


	}//end TrafficLight


	//Built-in for checking button states
	public void itemStateChanged(ItemEvent e)
	{
		if(bRed.isSelected())
			tlpan.redOn();
		if(bYellow.isSelected())	
			tlpan.yellowOn();
		if(bGreen.isSelected())	
			tlpan.greenOn();
	}//end intemStateChanged

}//end class TrafficLight

class TLPanel extends JPanel
{
	private boolean rB;
	private boolean yB;
	private boolean gB;
		
	//Create custom colors for off settings
	Color redOff = new Color(90,0,0);
	Color yellowOff = new Color(200,90,0);
	Color greenOff = new Color(0,100,0);
	
	public TLPanel()
	{
		greenOn();//initialize light
	}

	//When one is on, stop the other two
	public void redOn()
	{
		rB = true; 
		yB= false; gB = false;
		repaint();
	}//redOn

	public void yellowOn()
	{
		yB = true;
		rB = false; gB = false;
		repaint();
	}//yellowOn

	public void greenOn()
	{
		gB = true;
		rB = false; yB = false;
		
		repaint();
	}//greenOn


/**********************
* Paints the lights in the
* different states. Rather than 
* show the circles as black or blank
* I've set them to darker colors when off
* and bight color when on
*
***********************/


	public void paintComponent(Graphics g)
	{
		super.paintComponent(g);
		if(rB)
		{
			g.setColor(Color.black);
			g.drawRect(9, 5, 100, 320);
			g.setColor(Color.red);
			g.drawOval(10, 7, 95, 95);
			g.fillOval(10, 7, 95, 95);
			g.setColor(yellowOff);
			g.drawOval(10, 117, 95, 95);
      			g.fillOval(10, 117, 95, 95);
			g.setColor(greenOff);
			g.drawOval(10, 227, 95, 95);
      			g.fillOval(10, 227, 95, 95);
		}
		else if(yB)
		{
			g.setColor(Color.black);
			g.drawRect(9, 5, 100, 320);
			g.setColor(redOff);
			g.drawOval(10, 7, 95, 95);
			g.fillOval(10, 7, 95, 95);
			g.setColor(Color.yellow);
			g.drawOval(10, 117, 95, 95);
      			g.fillOval(10, 117, 95, 95);
			g.setColor(greenOff);
			g.drawOval(10, 227, 95, 95);
      			g.fillOval(10, 227, 95, 95);
		}
		else if(gB)
			{
			g.setColor(Color.black);
			g.drawRect(9, 5, 100, 320);
			g.setColor(redOff);
			g.drawOval(10, 7, 95, 95);
      			g.fillOval(10, 7, 95, 95);
			g.setColor(yellowOff);
			g.drawOval(10, 117, 95, 95);
      			g.fillOval(10, 117, 95, 95);
			g.setColor(Color.green);
			g.drawOval(10, 227, 95, 95);
			g.fillOval(10, 227, 95, 95);
		}
	}//end paintComponent

	public Dimension getPreferredSize()
	{
		return new Dimension(120, 330);
	}//end getPreferredSize()


}//end TLPanel