import javax.swing.*;
import javax.swing.plaf.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
   
/**
 * This class implements a simple drawing program in java
 * 
 * @author Stuart Hansen 
 * @version September 28, 2008
 */

public class DrawProgram extends JFrame {   
   // These elements form the GUI of the application
   DrawPanel drawPanel = new DrawPanel();    
   JMenuBar menuBar = new JMenuBar();
   JMenu menu = new JMenu ("File");
   JMenuItem colorItem = new JMenuItem("Color");
   JMenuItem clearItem = new JMenuItem("Clear");
   JMenuItem exitItem = new JMenuItem ("Exit");          
   
   public DrawProgram () {
      super ("Line Draw");

      // add the menu to the application Frame
      setJMenuBar (menuBar);
      menu.add(colorItem);
      menu.add(clearItem);
      menu.add(exitItem);
      menuBar.add(menu);
    
      // setup the drawPanel
      getContentPane().add(drawPanel);
      drawPanel.setBackground(Color.white);
      // Set the current Color
      drawPanel.setColor(Color.black);

      // Change the drawing color
      colorItem.addActionListener (
         new ActionListener () {
            public void actionPerformed (ActionEvent e) {
               Color oldColor = drawPanel.getColor();
               Color newColor = JColorChooser.showDialog(null, 
                                   "Choose a new color", oldColor);
               if (newColor != null) 
                  drawPanel.setColor(newColor);
            }
         }
      );
   
      // Clear the drawing by replacing the DrawingPanel
      clearItem.addActionListener (
         new ActionListener () {
            public void actionPerformed (ActionEvent e) {
               drawPanel.reset();
               //repaint();
            }
         }
      );                                             
   
      // Exit the system elegantly
      exitItem.addActionListener (
         new ActionListener () {
            public void actionPerformed (ActionEvent e) {
               System.exit(0);
            }
         }
      );
   
      // Set the application window's properties
      setSize (400, 400);
      setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   
      // display the application window
      setVisible(true);
   }
    
   // a very simple main program
   public static void main (String args[]) {
      new DrawProgram();
   }
}