//------------------------------------------------------
// mainWindow.java -- implementation of mainWindow class
//------------------------------------------------------

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.media.opengl.*;
import java.lang.String;


public class mainWindow implements Runnable
{
	static Thread disp_thread = new Thread(new mainWindow());
	static boolean quit = false;
	static glWidget gl_listener;

	static String currentMode = "None";			// draw lines
	static GLJPanel canvas;

	public static void main(String[] args)
	{
		disp_thread.start();			// starts the thread and calls run()
	}

	public void run()
	{
		JFrame frame = new JFrame("Example Drawing App(Java Implementation)");

									// create menu bar
		JMenuBar menubar = new JMenuBar();
									// create menus
		JMenu fileMenu =  new JMenu("File");
			JMenuItem quitItem = new JMenuItem("Quit");
			quitItem.addActionListener(
				new ActionListener(){
					public void actionPerformed(ActionEvent e)
					{
						System.exit(0);
					}
				});
		fileMenu.add(quitItem);
		JMenu drawMenu =  new JMenu("Draw");
			JMenuItem drawLineItem = new JMenuItem("Draw Line");
			drawLineItem.addActionListener(
				new ActionListener(){
					public void actionPerformed(ActionEvent e)
					{
						changeMode ("Draw Line");	
					}
				});
			JMenuItem drawFreeItem = new JMenuItem("Draw Freehand");
			drawFreeItem.addActionListener(
				new ActionListener(){
					public void actionPerformed(ActionEvent e)
					{
						changeMode ("Draw Freehand");	
					}
				});
			JMenuItem drawImageItem = new JMenuItem("Draw Image");
			drawImageItem.addActionListener(
				new ActionListener(){
					public void actionPerformed(ActionEvent e)
					{
						changeMode ("Draw Image");	
					}
				});
			JMenuItem clearItem = new JMenuItem("Clear Canvas");
			clearItem.addActionListener(
				new ActionListener(){
					public void actionPerformed(ActionEvent e)
					{
						changeMode ("Clear Canvas");	
					}
				});

							// add the menu items to draw menu
		drawMenu.add(drawLineItem);
		drawMenu.add(drawFreeItem);
		drawMenu.add(drawImageItem);
		drawMenu.add(clearItem);

							// add menus to the menubar

		menubar.add(fileMenu);
		menubar.add(drawMenu);
							// add menubar to the frame
		frame.setJMenuBar(menubar);

							// create the gl canvas
		canvas = new GLJPanel();
							// create the listeners for various events
		gl_listener = new glWidget(this, canvas);
		canvas.addGLEventListener(gl_listener);
		canvas.addMouseListener((MouseListener)gl_listener);
		canvas.addMouseMotionListener((MouseMotionListener)gl_listener);
							// add canvas, set frame geometry
		frame.add(canvas);
		frame.setSize(700, 500);
		frame.setLocation(250, 250);

									// terminate thread if window is closed
		frame.addWindowListener(new WindowAdapter()
			{
				public void windowClosing(WindowEvent e) 
				{
					quit = true;
             	}
			}
		);
		
		frame.setVisible(true);
		canvas.requestFocus();
		if (!quit)
			canvas.display();
	}

	public void changeMode(String m)
	{
		currentMode  = m;
		gl_listener.changeMode(m);

		if (m == "Clear Canvas")
			canvas.display();
	} 

	public String getCurrentMode()
	{
		return currentMode;
	}
}