import java.applet.*;
import java.awt.*;
import java.awt.image.MemoryImageSource;


public class rigid_rotor extends Applet implements Runnable
{
	Thread	 m_rigid_rotor = null;

	public boolean running = false;

	private Font font;
	private Font titleFont;
	private FontMetrics fm;
	private FontMetrics titleFm;
	
	private Graphics Fig1Graphics;
	private Image Fig1;

	private Graphics Fig2Graphics;
	private Image Fig2;

	private Image Atom_A;
	private atom1 atom_A = new atom1();
	
	private Image Atom_B;
	private atom1 atom_B = new atom1();

	private Image Reduced_Mol;
	private atom1 reduced_Mol = new atom1();

	private atom1 label_Pos = new atom1();

    // Parameter names.  To change a name of a parameter, you need only make
	// a single change.  Simply modify the value of the parameter string below.
    //--------------------------------------------------------------------------
	private final String PARAM_ProfPass = "ProfPass";

	public rigid_rotor()
	{
	}

	public String getAppletInfo()
	{
		return "Name: rigid_rotor\r\n" +
		       "Author: Dr. P. Bird\r\n" +
			   "Copyright, September 1997\r\n" +
		       "Created with Microsoft Visual J++ Version 1.0";
	}

	public void init()
	{
		resize(550, 250);

		font =	new Font("Courier",Font.BOLD,14);
		titleFont  = new Font("TimesRoman",Font.BOLD,16);
		titleFm = getFontMetrics(titleFont);
		setFont(titleFont);

		setBackground(Color.white);
		setForeground(Color.black);

		Fig1 = createImage(250,200);	  //Create off screen images
		Fig1Graphics = Fig1.getGraphics();

		Fig2 = createImage(250,200);	  //Create off screen images
		Fig2Graphics = Fig2.getGraphics();

		MediaTracker tracker = new MediaTracker(this);	  //Get .gifs
 		Atom_A = getImage(getDocumentBase(), "Atom_A.gif");
		tracker.addImage(Atom_A,1);
		Atom_B = getImage(getDocumentBase(), "Atom_B.gif");
		tracker.addImage(Atom_B,2);
		Reduced_Mol = getImage(getDocumentBase(), "Reduced_Mol.gif");
		tracker.addImage(Reduced_Mol,3);

		try
		{
			tracker.waitForAll();
			if (tracker.isErrorAny())
			{
				showStatus("Error loading the images");
				stop();
			}
		}
		catch(InterruptedException e)
		{
			showStatus("InterruptedException (Tracker)");
			stop();
		}

		atom_A.pathRadius = 30.0;
		atom_B.pathRadius = 50.0;

		reduced_Mol.pathRadius = 80.0;
		label_Pos.pathRadius = 40;
 	}

	public void destroy()
	{
	}

	public void paint()
	{
	}

	public synchronized void update(Graphics g)
	{
		if (!running)
		{
//			g.setColor(Color.white);
//			g.fillRect(0,0,550,250);
//			g.setColor(Color.black);
		}
		g.drawImage(Fig1,0,0,null);
		g.drawImage(Fig2,275,0,null);
		g.setColor(Color.black);
		g.drawString("Figure 1.",100,245);
		g.drawString("Figure 2.",370,245);
	}

	public void start()
	{
		if (m_rigid_rotor == null)
		{
			m_rigid_rotor = new Thread(this);
			m_rigid_rotor.start();
		}
	}
	
	public void stop()
	{
		if (m_rigid_rotor != null)
		{
			m_rigid_rotor.stop();
			m_rigid_rotor = null;
		}
	}

	public void run()
	{
		
		double angle = 0.0;
		running = false;
		repaint();
		running = true;
		Fig1Graphics.setFont(font);
		Fig2Graphics.setFont(font);

		while (true)
		{
			try
			{
				Fig1Graphics.setColor(Color.white);
				Fig1Graphics.clearRect(0,0,250,200);
				atom_A.atomPosition(angle);
				atom_B.atomPosition(angle+180.0);
				label_Pos.atomPosition(angle+180);
				Fig1Graphics.setColor(Color.red);
				Fig1Graphics.drawLine
					(atom_A.xpos+125,atom_A.ypos+100,atom_B.xpos+125,atom_B.ypos+100);
				Fig1Graphics.setColor(Color.black);
				Fig1Graphics.drawImage(Atom_A,atom_A.xpos+125-10,atom_A.ypos+100-10,null);
				Fig1Graphics.drawImage(Atom_B,atom_B.xpos+125-10,atom_B.ypos+100-10,null);
//				Fig1Graphics.fillOval(123,123,5,5);
				Fig1Graphics.drawString("m",atom_A.xpos+125-15,atom_A.ypos+100+15);
				Fig1Graphics.drawString("1",atom_A.xpos+125-5,atom_A.ypos+100+20);
 				Fig1Graphics.drawString("m",atom_B.xpos+125-15,atom_B.ypos+100+15);
				Fig1Graphics.drawString("2",atom_B.xpos+125-5,atom_B.ypos+100+20);
 				Fig1Graphics.drawString("r",123,102);
			
				Fig2Graphics.setColor(Color.white);
				Fig2Graphics.clearRect(0,0,250,200);
				reduced_Mol.atomPosition(angle+180.0);
				Fig2Graphics.setColor(Color.red);
				Fig2Graphics.drawLine
					(reduced_Mol.xpos+125,reduced_Mol.ypos+100,125,100);
				Fig2Graphics.setColor(Color.black);
				Fig2Graphics.drawImage(Reduced_Mol,reduced_Mol.xpos+125-10,reduced_Mol.ypos+100-10,null);
//				Fig2Graphics.fillOval(123,123,5,5);
  				Fig2Graphics.drawString("M",reduced_Mol.xpos+125+10,reduced_Mol.ypos+100-10);
				Fig2Graphics.drawString("r",label_Pos.xpos+123,label_Pos.ypos+102);

			
				angle = angle + 2.0;
				if (angle >= 360.0) angle = 0.0;

				repaint();
				Thread.sleep(60);
//				repaint(275,0,250,200);
			}
			catch (InterruptedException e)
			{
				stop();
			}
		}
	}

	public boolean mouseDown(Event evt, int x, int y)
	{
		return true;
	}

	public boolean mouseUp(Event evt, int x, int y)
	{
		return true;
	}

}