import java.applet.*;
import java.awt.*;

public class deBroglie_wave extends Applet implements Runnable
{
	Thread	 deBroglie = null;

//	public boolean running = false;

	private Font font;
	private Font titleFont;
	private FontMetrics fm;
	private FontMetrics titleFm;
	
	private Graphics ringGraphics;
	private Image ring;

	private Image Electron;
	private atom electron = new atom();
	private double realRadiusScale = 52.9/50;              //pm per pixel

	private Image Nucleus;

	private int[] sineWave = new int[37];	  //data points for wave
//	private int[] nWaveSum = new int[82];
//	private int pass;
	private double trialRadius;
	private int pixRadius;
	private double lambda;						  //in degrees around the orbit
//	private double lambdaScale = 24.748;		  //to get wave length in degrees!
	private double velocity = 0.50;
	private double velocityScale = 0.5;
	private double circumference;
	private double realCircumference;
	private double stepSize;
	private double stepScale = 2.0;
	private double waveStepSize;
	private boolean showWave = false;
	private atom wavePoint1 = new atom();
	private atom wavePoint2 = new atom();
	
	private String m_ProfPass = "Qatg1yh";

	private Scrollbar radiusScrollbar = 
		new Scrollbar(Scrollbar.HORIZONTAL,200,5,10,1000);
	private Label scrollbarLabel = new Label("Select radius - ");
	private Label scrollbarValue = new Label("");
	private Button tryItButton = new Button("Show Wave");
	private Panel panel = new Panel();


    // 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 deBroglie_wave()
	{
	}

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

	public String[][] getParameterInfo()
	{
		String[][] info =
		{
			{ PARAM_ProfPass, "String", "Debugging password" },
		};
		return info;		
	}

	public void init()
	{
		String param;
		
		System.out.println("Entering init");
		setBackground(Color.white);

		param = getParameter(PARAM_ProfPass);
		if (param != null)
			m_ProfPass = param;

//		resize(550, 350);

		setLayout(new BorderLayout());
		panel.setLayout(new GridLayout(1,4,5,5));
		panel.add(scrollbarLabel);
		panel.add(radiusScrollbar);
		panel.add(scrollbarValue);
		panel.add(tryItButton);

		add("South",panel);


//		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);

		ring = createImage(550,280);	  //Create off screen images
		ringGraphics = ring.getGraphics();

		MediaTracker tracker = new MediaTracker(this);	  //Get .gifs
 		Electron = getImage(getDocumentBase(), "electron.gif");
		tracker.addImage(Electron,1);
		Nucleus = getImage(getDocumentBase(), "nucleus.gif");
		tracker.addImage(Nucleus,2);

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

		trialRadius = (double)radiusScrollbar.getValue();
		atom.pathRadius1 = trialRadius/4.0;					   //in pixels
		pixRadius = (int)(atom.pathRadius1+0.5);			   //in pixels	(fixed)
		atom.pathRadius2 = trialRadius/(4.0*3.0);			   //in pixels
		atom.realRadius = realRadiusScale*trialRadius;		   //in pm
		circumference = 2.0*Math.PI*trialRadius/4.0;				   //in pixels
		realCircumference = 2.0*Math.PI*atom.realRadius;	   //in pm
		stepSize = 360.0*stepScale/circumference;				   //in pixels
//		System.out.println("About to calculate Velocity");
		velocity = radiusToVelocity(atom.realRadius);
//		System.out.println("done it!");
		lambda = 2.0*Math.PI*7.27324*Math.sqrt(atom.realRadius);  //in pm
		waveStepSize = 10.0*lambda/realCircumference;			   //in degrees around orbit
		scrollbarValue.setText
			("Radius: "+ Float.toString((float)atom.realRadius)+ " pm");
//		scrollbarValue.setText
//			("Radius: "+ Double.toString(atom.realRadius)+ " pm");

		for (int i = 0; i <=36; i++)
			sineWave[i]= electron.rint(20.0*Math.sin(2.0*Math.PI*((double)i/36.0)));
 	}

	public void destroy()
	{
	}

	public void paint()
	{
	}

	public void update(Graphics g)
	{
		g.setColor(Color.gray);
		g.drawString("Copyright 1998, P.H. Bird",380,12);
		g.setColor(Color.black);
		g.drawImage(ring,0,25,null);
		g.setColor(Color.black);
//		g.drawString("Fig 2. An Electron - Wave in its Orbit",20,20);
	}

	public void start()
	{
		if (deBroglie == null)
		{
			deBroglie = new Thread(this);
			deBroglie.start();
//			try deBroglie.setPriority(Thread.MAX_PRIORITY); catch (SecurityException e) {}
		}
	}
	
	public void stop()
	{
		if (deBroglie != null)
		{
			deBroglie.stop();
			deBroglie = null;
		}
	}

	public void run()
	{
		
		double angle = 0.0;
		double waveAngle0;
		double waveAngle1;
		double waveAngle2;
		int i;


		while (true)
		{
			try
			{
				Thread.sleep((int)(1.0/velocity));
				ringGraphics.setColor(Color.white);
				ringGraphics.clearRect(0,0,550,280);
				ringGraphics.setColor(Color.red);
				electron.atomPosition(angle);
				ringGraphics.drawOval
					(275-pixRadius,140-(pixRadius+1)/3,
					2*pixRadius,-1+2*(pixRadius+1)/3);
				ringGraphics.drawOval
					(275-pixRadius,140-(pixRadius+1)/3,
					2*pixRadius,2*(pixRadius+1)/3);
				ringGraphics.drawOval
					(275-pixRadius,140-(pixRadius+1)/3,
					2*pixRadius,1+2*(pixRadius+1)/3);
				if (!showWave)
				{
					if (electron.ypos < 0)
					{
						ringGraphics.drawImage(Electron,electron.xpos+275-6,electron.ypos+140-5,null);
						ringGraphics.drawImage(Nucleus,275-6,140-5,null);
					}
					else
					{
						ringGraphics.drawImage(Nucleus,275-6,140-5,null);
						ringGraphics.drawImage(Electron,electron.xpos+275-6,electron.ypos+140-5,null);
					}
				}
				else
				{
					waveAngle0 = 0;
					waveAngle1 = angle;
					waveAngle2 = angle + waveStepSize;
					ringGraphics.setColor(Color.red.darker().darker());
					i = 0;

					wavePoint1.atomPosition(waveAngle1+waveStepSize);
					ringGraphics.drawString
						("x",wavePoint1.xpos+270,wavePoint1.ypos+175);
					ringGraphics.drawString
						("o",wavePoint1.xpos+277,wavePoint1.ypos+178);
					ringGraphics.drawLine(wavePoint1.xpos+275,wavePoint1.ypos+165,
						wavePoint1.xpos+275,wavePoint1.ypos+150);
					ringGraphics.drawLine(wavePoint1.xpos+273,wavePoint1.ypos+155,
						wavePoint1.xpos+275,wavePoint1.ypos+150);
					ringGraphics.drawLine(wavePoint1.xpos+277,wavePoint1.ypos+155,
						wavePoint1.xpos+275,wavePoint1.ypos+150);
					ringGraphics.setColor(Color.blue);
			
					while (waveAngle0 <= 360.0)
					{
						ringGraphics.drawImage(Nucleus,275-6,140-5,null);
						waveAngle0 = waveAngle0 + waveStepSize;
						waveAngle1 = waveAngle1 + waveStepSize;
						wavePoint1.atomPosition(waveAngle1);
						waveAngle2 = waveAngle2 + waveStepSize;
						wavePoint2.atomPosition(waveAngle2);
						ringGraphics.drawLine(wavePoint1.xpos+275,wavePoint1.ypos+140+sineWave[i],
							wavePoint2.xpos+275,wavePoint2.ypos+140+sineWave[i+1]);
 						ringGraphics.drawLine(wavePoint1.xpos+275,wavePoint1.ypos+140,
							wavePoint1.xpos+275,wavePoint1.ypos+140+sineWave[i]);

						i++;
						if (i > 35) i = 0;
					}
				}
				angle = angle + stepSize;
				if (angle >= 36000.0) angle = 0.0;
				repaint(0,0,550,310);
			}
			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;
	}

	public double radiusToVelocity(double radius)
	{
		double velocity;

		velocity = velocityScale/Math.sqrt(radius); 
		return velocity;
	}

	public double radiusToWaveLength(double radius)
	{
		double waveLength;

		waveLength = 7.270/radiusToVelocity(radius);
		return waveLength;
	}

	public boolean handleEvent (Event event)
	{
		if (event.target == radiusScrollbar)
		{
			trialRadius = (double)radiusScrollbar.getValue();		   
			atom.pathRadius1 = trialRadius/4.0;					   //in pixels
			pixRadius = (int)(atom.pathRadius1+0.5);			   //in pixels	(fixed)
			atom.pathRadius2 = trialRadius/(4.0*3.0);			   //in pixels
			atom.realRadius = realRadiusScale*trialRadius;		   //in pm
			circumference = 2.0*Math.PI*trialRadius/4.0;			   //in pixels
			realCircumference = 2.0*Math.PI*atom.realRadius;	   //in pm
			
			stepSize = 360.0*stepScale/circumference;				   //in degrees
			velocity = radiusToVelocity(atom.realRadius);
			lambda = 2.0*Math.PI*7.27324*Math.sqrt(atom.realRadius);  //in pm
			waveStepSize = 10.0*lambda/realCircumference;			   //in degrees around orbit
			scrollbarValue.setText
				("Radius: "+Double_toString(atom.realRadius,3)+ " pm");
			return true;
		}
		else
			return super.handleEvent(event);
//			return true;
	}

	public boolean action (Event event, Object obj)
	{
 		if (event.target instanceof Button)
		{
			if (!showWave)
			{
				showWave = true;
				tryItButton.setLabel("Show particle");
			}
			else
			{	
				showWave = false;
				tryItButton.setLabel("Show wave");
			}
			repaint();
			return true;
		}
		else
			return super.action(event,obj);
//			return true;
	}
	public String Double_toString(double x, int dp)
	//Round to dp decimal places 
	{
		int i = 0;
		double mul = 1;
		while (i < dp)
		{
			mul = mul*10.0;
			i = i + 1;
		}
		return Double.toString((double)(Math.rint(x*mul))/mul);
	}
}