کد:
import java.applet.*;
import java.util.*;
import java.awt.*;
import java.net.*;
import java.io.*;
public class TSP extends Applet implements Runnable {
public int NCITY = 5;
public int NGEONEURON;
public static final double COUNTRY = 1.00;
public static final double NEAR = 0.05;
public static final Color bkC = new Color(0x000090);
public static final Color bk2C = new Color(0x000050);
public static final Color lnC = new Color(0xff0000);
public static final Color ln2C = new Color(0xcccc00);
public static final Color fgC = new Color(0xffffff);
public Image homeI,offscreen;
public int imagewidth ,imageheight;
public Thread animator = null;
public boolean please_stop = false;
Font mF = new Font("Courier", Font.BOLD, 12);
Font sF = new Font("Courier", Font.BOLD, 8);
public int counter;
public City city[];
public geoNeuron gn[];
public double r[][];
public double theta, phi, momentum;
public Scrollbar cscroll;
///////////////////////////////////////////////////////////////////
//
// Init section
//
///////////////////////////////////////////////////////////////////
public void kohonenInit(){
theta = 0.5;
phi = 0.5;
momentum = 0.995;
NCITY = cscroll.getValue()/10;
NGEONEURON = NCITY*2;
//URL url;
//homeI = this.getImage(this.getDocumentBase(), "home.gif");
city = new City[NCITY];
for(int i = 0; i<NCITY; i++) city[i] = new City(Math.random()*COUNTRY, Math.random()*COUNTRY);
double alpha = 0.0;
gn = new geoNeuron[NGEONEURON];
for(int i = 0; i<NGEONEURON; i++){
gn[i] = new geoNeuron(0.5+0.5*Math.cos(alpha),0.5+0.5*Math.sin(alpha));
alpha += Math.PI *2.0 / (double)(NGEONEURON);
}
r = new double[NGEONEURON][NGEONEURON];
makeR(theta);
counter = 0;
}
///////////////////////////////////////////////////////////////////
//
// Problem section
//
///////////////////////////////////////////////////////////////////
public void makeR(double th){
//System.out.println("");
for(int i=0; i<NGEONEURON; i++){
r[i][i]= 1.0;
for(int j=i+1; j<NGEONEURON; j++){
r[i][j] = Math.exp( -1.0 * ( gn[i].dist(gn[j])*gn[i].dist(gn[j]) )/(2.0*th*th));
r[j][i] = r[i][j];
//System.out.print(" "+r[i][j]);
}
//System.out.println("");
}
}
// The body of the animator thread.
public void run() {
int idx,j;
double x1,x2,mindist;
int count = 0;
while(!please_stop) {
counter++;
// CHOSE A RANDOM PATTERN
idx = (int)(Math.random()*NCITY);
x1 = city[idx].x+(Math.random()*NEAR)-NEAR/2;
x2 = city[idx].y+(Math.random()*NEAR)-NEAR/2;
city[idx].choose++;
// SEARCH FOR MINIMAL
mindist = 100000.0;
j = -1;
for(int i=0; i<NGEONEURON;i++){
double d = (x1 - gn[i].wx)*(x1 - gn[i].wx) + (x2 - gn[i].wy)*(x2 - gn[i].wy);
//double d = x1*gn[i].wx + x2*gn[i].wy;
//System.out.println("d="+d);
if(d < mindist){
mindist = d;
j = i;
}
}
gn[j].update++;
// UPDATE WEIGHTS
for(int i=0; i<NGEONEURON;i++){
gn[i].wx += (phi * r[i][j] * (x1 - gn[i].wx));
gn[i].wy += (phi * r[i][j] * (x2 - gn[i].wy));
}
// DECREASE LEARNING PARAMETERS
phi *= momentum;
theta *= momentum;
// RE-COMPUTE r MATRIX
makeR(theta);
// PLOT RESULT EVERY 10 SESSIONS
count = (count++)%10;
if(count==0){
//System.out.println("theta = "+theta+" phi = "+phi);
paint(this.getGraphics());
// Call Garbage Collect
//System.gc();
try {Thread.sleep(10);} catch (InterruptedException e){};
}
}
animator = null;
}
///////////////////////////////////////////////////////////////////
//
// Functional section
//
///////////////////////////////////////////////////////////////////
public void init() {
cscroll = new Scrollbar(Scrollbar.HORIZONTAL,NCITY*10, 10, 30, 200);
cscroll.setLineIncrement(10);
cscroll.setPageIncrement(10);
add(cscroll);
kohonenInit();
}
private int toXReal(double val){int w = this.size().width;return (int)(val *((double)w/2.0-50.0) / COUNTRY +25.0);}
private int toYReal(double val){int h = this.size().height;return (int)(val *((double)h-50.0) / COUNTRY +25.0);}
private int to2XReal(double val){int w = this.size().width;return (int)((double)w/2.0 + val *((double)w/2.0-50.0) / COUNTRY +25.0);}
private int to2YReal(double val){int h = this.size().height;return (int)(val *((double)h-50.0) / COUNTRY +25.0);}
public void paintLeft(Graphics g) {
Dimension size = this.size();
int w = size.width, h = size.height;
g.setFont(mF);
// CLEAR ALL
g.setColor(bkC);
g.fillRect(0, 0, w, h);
// DRAW GRID
g.setColor(bk2C);
for(double i=0; i<=COUNTRY; i+=(COUNTRY/20.0)){
g.drawLine(toXReal(0.0),toYReal(i),toXReal(COUNTRY),toYReal(i));
g.drawLine(toXReal(i),toYReal(0.0),toXReal(i),toYReal(COUNTRY));
}
//DRAW PATH
g.setColor(lnC);
for(int i=0; i<NGEONEURON; i++){
g.drawLine( toXReal(gn[i].wx),toYReal(gn[i].wy),
toXReal(gn[(i+1)%NGEONEURON].wx),toYReal(gn[(i+1)%NGEONEURON].wy) );
g.drawString(""+i+"-"+(gn[i].update*100/counter)+"%",toXReal(gn[i].wx),toYReal(gn[i].wy));
}
g.setColor(fgC);
// DRAW CITYS
for(int i=0; i<NCITY; i++){
g.drawOval( toXReal(city[i].x)-4, toYReal(city[i].y)-4,8,8);
g.drawString(""+i+"-"+(city[i].choose*100/counter)+"%",toXReal(city[i].x),toYReal(city[i].y)+8);
}
}
public void paintRight(Graphics g) {
Dimension size = this.size();
int w = size.width, h = size.height;
// CLEAR ALL
g.setColor(bkC);
g.fillRect(0, 0, w, h);
g.setFont(sF);
// DRAW CITYS
g.setColor(fgC);
for(int i=0; i<NCITY; i++){
g.drawOval( to2XReal(city[i].x)-4, to2YReal(city[i].y)-4,8,8);
//g.drawString("["+city[i].wx+";"+gn[i].wy+"]",to2XReal(gn[i].x),to2YReal(gn[i].y));
}
g.setColor(ln2C);
for(int i=0; i<NGEONEURON; i++)
for(int j=i+1; j<NGEONEURON; j++){
g.drawLine( to2XReal(gn[i].x),to2YReal(gn[i].y),
to2XReal(gn[j].x),to2YReal(gn[j].y));
g.drawString(""+r[i][j],to2XReal((gn[i].x+gn[j].x)/2),to2YReal((gn[i].y+gn[j].y)/2));
//r[i][j] = Math.exp( -1.0 * (double)( gn[i].dist(gn[j])*gn[i].dist(gn[j]) )/(2.0*th));
}
g.setFont(mF);
g.setColor(fgC);
g.drawString("phi="+phi+" theta="+theta,to2XReal(0.0),to2YReal(0.0)+20);
}
public void paint(Graphics g) {
Dimension size = this.size();
int w = size.width, h = size.height;
this.setBackground(bkC);
if ((offscreen == null) || ((imagewidth != w) || (imageheight != h))) {
offscreen = this.createImage(w, h);
imagewidth = w;
imageheight = h;
}
Rectangle clip = new Rectangle(toXReal(0),toYReal(0),toXReal(COUNTRY),toYReal(COUNTRY));
Graphics goff = offscreen.getGraphics();
goff.clipRect(clip.x, clip.y, clip.width, clip.height);
Graphics g1 = this.getGraphics();
g1.clipRect(clip.x, clip.y, clip.width, clip.height);
paintLeft(goff);
g1.drawImage(offscreen, 0, 0, this);
//clip = new Rectangle(to2XReal(0),to2YReal(0),to2XReal(COUNTRY),to2YReal(COUNTRY));
//goff = offscreen.getGraphics();
//goff.clipRect(clip.x, clip.y, clip.width, clip.height);
//g1 = this.getGraphics();
//g1.clipRect(clip.x, clip.y, clip.width, clip.height);
//paintRight(goff);
//g1.drawImage(offscreen, 0, 0, this);
clip = null;
goff = null;
g1 = null;
System.gc();
// CLEAR ALL
g.setColor(bkC);
g.fillRect(w/2+30,0,w/2+130, 20);
g.setColor(fgC);
g.drawString("# of city:"+cscroll.getValue()/10,w/2+30,20);
}
// Start the animation
public void start() {
animator = new Thread(this);
animator.start();
}
// Stop it.
public void stop() {
if (animator != null) animator.stop();
animator = null;
}
// Stop and start animating on mouse clicks.
public boolean mouseDown(Event e, int x, int y) {
// if running, stop it. Otherwise, start it.
if (animator != null){
please_stop = true;
}else{
please_stop = false;
animator = new Thread(this);
kohonenInit();
animator.start();
}
return true;
}
}
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