/**
 *	Prime Number Generator.
 *	@author Mark Chamness
 *	Any suggestions are appreciated.
 *
 *	This applet calculates prime numbers.
 *	It stores the first 10,000 primes it generates.
 *	It evaluates the rest based on those
 *	such that (prime[n] squared) < test prime.
 *	The 10,000th prime save is 104,743 .  So this applet 
 *	should calculate primes to 10,971,096,049
 *
 *	Since this Applet would run out of memory,
 *	the TextArea is cleared after every 200,000 primes listed.
 **/

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

public class PrimesApplet extends JApplet implements ActionListener
{
	JButton runButton = new JButton("Run");

	JButton stopButton = new JButton("Stop");

	Color appColor = Color.lightGray;

	private JTextArea dataTextArea = new JTextArea(20, 40);
	
	private JScrollPane scrollPane = new JScrollPane(dataTextArea);

	private Calculate calc = new Calculate(dataTextArea);

	public PrimesApplet()
	{
		Container cont = getContentPane();
		cont.setLayout(new BorderLayout());
		JPanel northPanel = new JPanel();
		northPanel.setLayout(new GridLayout(2, 1));
		northPanel.setBackground(Color.gray);
		northPanel.add(new JLabel("Calculate Primes", JLabel.CENTER));
		northPanel.add(new JLabel("Click Run to Start", JLabel.CENTER));
		northPanel.setBackground(appColor);
		cont.add("North", northPanel);
		JPanel southPanel = new JPanel();
		southPanel.setBackground(appColor);
		southPanel.setLayout(new FlowLayout());
		runButton.addActionListener(this);
		runButton.setPreferredSize(new Dimension(85, 23));
		southPanel.add(runButton);
		stopButton.addActionListener(this);
		southPanel.add(stopButton);
		cont.add("South", southPanel);
		scrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_NEVER); 
		scrollPane.setPreferredSize(new Dimension(100, 200));
		cont.add("Center", scrollPane);
		cont.setBackground(appColor);
		runButton.requestFocus();
	}

	public void actionPerformed(ActionEvent ae)
	{
		Object object = ae.getSource();
		if (object == runButton)
		{
			if (calc.getStatus() == Calculate.STOPPED)
			{
				dataTextArea.setText("");
				calc = new Calculate(dataTextArea);
				calc.start();
				runButton.setText("Pause");
			} else if (calc.getStatus() == Calculate.RUNNING)
			{
				calc.pause();
				runButton.setText("Resume");
			} else if (calc.getStatus() == Calculate.PAUSED)
			{
				runButton.setText("Pause");
				calc.continueRunning();
			}
		} else if (object == stopButton)
		{
			calc.stopRunning();
			runButton.setText("Run");
		}
	}
}