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

/**
 * This program implements a simple drawing program in java
 * 
 * @author Stuart Hansen 
 * @version December 22, 2000
 * modified October 16, 2001 -- added alternative colors
 * modified February 5, 2002 -- made resizing work
 * modified February 4, 2003 -- changed to drawing with lines
 */
public class LineDraw extends JFrame {

    /** draw is the area of the JFrame we actually draw in */
    DrawPanel drawPanel;

    /** the constructor */
    public LineDraw () {
        super ("Line Draw");
      
        // setup the drawing area and add it to the application Frame
        drawPanel = new DrawPanel();
        getContentPane().add(drawPanel);

        // add the menu to the application Frame
        setJMenuBar (new DrawMenuBar() );

        // Set the application window's properties
        setSize (400, 400);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        // display the application window
        setVisible(true);
    }


    /** This class represents our menu */
    private class DrawMenuBar extends JMenuBar {

        // the menu and menu items
        JMenu menu = new JMenu ("File");
        JMenuItem colorItem = new JMenuItem("Color");
        JMenuItem clearItem = new JMenuItem("Clear");
        JMenuItem exitItem = new JMenuItem ("Exit");

        // The menu bar contains a menu with two items
        public DrawMenuBar () {

            // Change the drawing color
            colorItem.addActionListener (
                new ActionListener () {
                    public void actionPerformed (ActionEvent e) {
                        // We save the old color in case the user cancels
                        Color oldColor = drawPanel.getCurrentColor();
                        Color currentColor = JColorChooser.showDialog(null, 
                                    "Choose a new color", oldColor);
                        if (currentColor != null) 
                            drawPanel.setCurrentColor(currentColor);
                    }
                }
            );

            // Clear the drawing by replacing the DrawingPanel
            clearItem.addActionListener (
                new ActionListener () {
                    public void actionPerformed (ActionEvent e) {
                        drawPanel.clear();
                    }
                }
            );                                             

            // Exit the system elegantly
            exitItem.addActionListener (
                new ActionListener () {
                    public void actionPerformed (ActionEvent e) {
                        System.exit(0);
                    }
                }
             );

            // Add the menu items to the menu and the menu to the bar
            menu.add(colorItem);
            menu.add(clearItem);
            menu.add(exitItem);
            add(menu);
        }
    }
 
    // a very simple main program
    public static void main (String args[]) {
        new LineDraw();
    }
}