/**
 * ClockPanel.
 * 
 * @author John Paxton 
 * @version November 21, 2008
 */

import javax.swing.JPanel;
import javax.swing.JLabel;
import javax.swing.JButton;
import javax.swing.JTextField;

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;

import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;

public class ClockPanel extends JPanel
{
    ClockPanel()
    {
        hour = 0;
        minute = 0;
        
        add (new JLabel("Hour: "));
        hours = new JTextField(10);
        add (hours);
        
        add (new JLabel("Minute: "));
        minutes = new JTextField(10);
        add (minutes);
        
        add (createButton("Draw Clock"));
        
        setBackground(Color.white);
    }
    
    public void paintComponent (Graphics g)
    {
        Graphics2D g2 = (Graphics2D) g;
        double radians;
        
        super.paintComponent(g);
        
        g2.setColor(Color.black);
        g2.drawOval(150, 150, 200, 200);
        
        g2.setColor(Color.blue);
        radians = minute / 60.0 * 2 * Math.PI - Math.PI / 2;
        drawHand(radians, 100, g2);
        
        g2.setColor(Color.red);
        radians = (hour * 60.0 + minute) / (12 * 60) * 2 * Math.PI - Math.PI / 2;
        drawHand(radians, 50, g2);
    }
    
    private void drawHand (double radians, int size, Graphics2D g2)
    {
        g2.drawLine(250, 250, (int) (250 + Math.cos(radians) * size), 
                        (int) (250 + Math.sin(radians) * size));
    }
    
    private JButton createButton (String label)
    {
        JButton result = new JButton(label);
        
        class AddActionListener implements ActionListener
        {            
            public void actionPerformed(ActionEvent evt)
            {
                hour = Integer.parseInt(hours.getText());
                minute = Integer.parseInt(minutes.getText());
                repaint();
            }
        }
        
        result.addActionListener(new AddActionListener());
        return result;
    }
    
    private JTextField hours;
    private JTextField minutes;
    private int hour;
    private int minute;
}