import java.applet.Applet;import java.awt.*;import java.awt.event.*;import java.lang.*;import java.io.*;public class MixtureEM extends Applet {    ControlPanel cPanel;    PlotCanvas pCanvas;    CurvedGaussMixture CGMix;    GaussLineMixture GLMix;    Database DB;    final int xSize = 600;    final int ySize = 600;    public void init() {	setLayout(new BorderLayout());	DB = new Database(xSize, ySize, Color.black);	CGMix = new CurvedGaussMixture(xSize, ySize, DB);	GLMix = new GaussLineMixture(xSize, ySize, DB);	pCanvas = new PlotCanvas(CGMix,				 GLMix,				 DB, xSize, ySize);	cPanel = new ControlPanel(pCanvas,				  CGMix,				  GLMix,				  DB);	add("Center", pCanvas);	add("South", cPanel);    }}class ControlPanel extends Panel implements Runnable {    Choice nKernels;    Choice selectmix;    Choice EMswitch;    PlotCanvas pcanvas;    CurvedGaussMixture cgmix;    GaussLineMixture glmix;    int select;    Database db;    double[] ws, ws2;    Thread th;    boolean runMode = false;    public ControlPanel (PlotCanvas pC,			 CurvedGaussMixture CGMix, 			 GaussLineMixture GLMix, 			 Database DB) {	cgmix = CGMix;	glmix = GLMix;	db = DB;	pcanvas = pC;	pcanvas.connectControlPanel(this);	ws = new double[9];	ws2 = new double[9];	ws[0] = 0.1;	ws2[0] = 10;	for(int i = 1; i < 9; i++) ws[i] = ws2[i] = 1;		setLayout(new FlowLayout());	setselect(3);	selectmix = new Choice();	ItemListener selectmixListener = new ItemListener() {	    public void itemStateChanged(ItemEvent e) {		String item = (String)e.getItem();		if ("GaussMix".equals(item)) {		    setselect(3);		    cgmix.randomKernels(ws2);		} 		else if("LineMix".equals(item)) {		    setselect(4);		    glmix.randomKernels(ws2);		}		pcanvas.repaint();					    }	};	    	selectmix.addItem("GaussMix");	selectmix.addItem("LineMix");	add(selectmix);	selectmix.addItemListener(selectmixListener);	Button ringPts = new Button("RingPts");	ActionListener ringPtsListener = new ActionListener() {	    public void actionPerformed(ActionEvent e) {		boolean thflag = (th != null);			stop();		db.circlePoints(100);		pcanvas.repaint();		if(thflag) start();			    }	};	add(ringPts);	ringPts.addActionListener(ringPtsListener);	Button randomPts = new Button("RandomPts");	ActionListener randomPtsListener = new ActionListener() {	    public void actionPerformed(ActionEvent e) {		boolean thflag = (th != null);			stop();		db.randomPoints(10);		pcanvas.repaint();		if(thflag) start();	    }	};	add(randomPts);	randomPts.addActionListener(randomPtsListener);	Button clearPts = new Button("ClearPts");	ActionListener clearPtsListener = new ActionListener() {	    public void actionPerformed(ActionEvent e) {		boolean thflag = (th != null);			stop();		db.clearPoints();		pcanvas.repaint();		if(thflag) start();	    }	};	add(clearPts);	clearPts.addActionListener(clearPtsListener);	Button initKernels = new Button("InitKernels");	ActionListener initKernelsListener = new ActionListener() {	    public void actionPerformed(ActionEvent e) {		boolean thflag = (th != null);						stop();		cgmix.randomKernels(ws);		glmix.randomKernels(ws);					pcanvas.repaint();		if(thflag) start();	    }	};	add(initKernels);	initKernels.addActionListener(initKernelsListener);	nKernels = new Choice();	ItemListener nKernelsListener = new ItemListener() {	    public void itemStateChanged(ItemEvent e) {		boolean thflag = (th != null);		stop();		int nK = Integer.parseInt((String)e.getItem());		cgmix.setnk(nK + 1, ws);		glmix.setnk(nK + 1, ws);		if(thflag) start();		pcanvas.repaint();	    }	};	nKernels.addItem("1");	nKernels.addItem("2");	nKernels.addItem("3");	nKernels.addItem("4");	nKernels.addItem("5");	nKernels.addItem("6");	nKernels.addItem("7");	nKernels.addItem("8");	add(nKernels);	nKernels.addItemListener(nKernelsListener);	EMswitch = new Choice();	ItemListener EMswitchListener = new ItemListener() {	    public void itemStateChanged(ItemEvent e) {		String item = (String)e.getItem();		if("EM Stop".equals(item)) {		    stop();		} 		else if("EM Run".equals(item)) {		    stop();		    start();		} 		else if("EM 1 Step".equals(item)) {		    stop();		    EM();		}		pcanvas.repaint();					    }	};	EMswitch.addItem("EM Stop");	EMswitch.addItem("EM Run");	EMswitch.addItem("EM 1 Step");	add(EMswitch);	EMswitch.addItemListener(EMswitchListener);    }    public void start() {	if(th == null) {	    th = new Thread(this);	}	th.start();    }    public void stop() {	th = null;    }    public void run() {	while(th != null) {	    try {		for(int i = 0; i < 5; i++) {		    EM();		}		pcanvas.repaint();		Thread.sleep(200);	    } catch(InterruptedException e) {e.printStackTrace();}	}    }    private void EM() {	if(select == 3) {	    cgmix.EM(ws);	} else if(select == 4) {	    glmix.EM(ws);	}    }    public void dbpush(int x, int y) {	if(th != null) {	    stop();	    db.push(x, y);	    start();	} else {	    db.push(x, y);	}    }       public void setselect(int sel) { 	select = sel;	pcanvas.setselect(sel);    }}class PlotCanvas extends Canvas implements MouseListener {    ControlPanel cp;    Database db;    CurvedGaussMixture cgmix;    GaussLineMixture glmix;    int select;    int xsiz, ysiz;    public PlotCanvas(CurvedGaussMixture CGMix,		      GaussLineMixture GLMix,		      Database DB, int xSize, int ySize) {	cgmix = CGMix;	glmix = GLMix;	db = DB;	setBackground(Color.white);	xsiz = xSize;	ysiz = ySize;	setSize(xSize, ySize);	this.addMouseListener(this);    }    public void connectControlPanel(ControlPanel cPanel) {	cp = cPanel;    }    public void paint(Graphics g) {	g.clearRect(0, 0, xsiz, ysiz);	db.paint(g);	if(select == 3) {	    cgmix.paint(g);	} else if(select == 4) {	    glmix.paint(g);	}    }     public void setselect(int sel) {	select = sel;    }        public void mouseClicked(MouseEvent e) {	cp.dbpush(e.getX(), e.getY());	repaint();    }    public void mouseEntered(MouseEvent e) {}    public void mouseExited(MouseEvent e) {}    public void mousePressed(MouseEvent e) {}    public void mouseReleased(MouseEvent e) {}  }class CurvedGaussMixture extends Mixture {    final int kmax = 10;    public CurvedGaussMixture(int xSize, int ySize, Database DB) {	super(xSize, ySize, DB);	initKernel(new Uniform(xsiz, ysiz, 0.0), typeuniform, 0);	for(int i = 1; i < kmax; i++) {	    initKernel(new CurvedGaussian(xsiz, ysiz, 0.0), typecurvedgauss, i);	}	setnk(2);    }}class GaussLineMixture extends Mixture {    final int kmax = 10;    public GaussLineMixture(int xSize, int ySize, Database DB) {	super(xSize, ySize, DB);	CurvedGaussian cgmix;	initKernel(new Uniform(xsiz, ysiz, 0.0), typeuniform, 0);	for(int i = 1; i < kmax; i++) {	    cgmix = new CurvedGaussian(xsiz, ysiz, 0.0);	    cgmix.setplotline();	    initKernel(cgmix, typecurvedgauss, i);	}	setnk(2);    }}