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public class Test extends JApplet implements Runnable {
/**
*
*/
private class ButtonPanel extends JPanel implements ActionListener {
private JButton newButton ;
private JButton runButton ;
private JButton pauseButton ;
private JButton infoButton ;
private ButtonPanel() {
super() ;
setLayout(new BoxLayout(this, BoxLayout.LINE_AXIS)) ;
newButton = new JButton ("New") ;
runButton = new JButton ("Run") ;
pauseButton = new JButton ("Pause") ;
infoButton = new JButton ("Info") ;
pauseButton.setEnabled(false) ;
newButton.addActionListener(this) ;
runButton.addActionListener(this) ;
pauseButton.addActionListener(this) ;
infoButton.addActionListener(this) ;
newButton.setToolTipText("New simulation") ;
runButton.setToolTipText("Run simulation") ;
pauseButton.setToolTipText("Pause simulation") ;
infoButton.setToolTipText("Simulation info") ;
add(newButton) ;
add(runButton) ;
add(pauseButton) ;
add(infoButton) ;
}
public void actionPerformed(ActionEvent e) {
if ( e.getSource() == newButton ) {
pause = true ;
pauseButton.setEnabled(false) ;
runButton.setEnabled(true);
depopulate();
populate(blacks,whites);
iterations=0;
}
else if ( e.getSource() == runButton ) {
pauseButton.setEnabled(true);
runButton.setEnabled(false);
pause = false;
}
else if ( e.getSource() == pauseButton ) {
pause = true;
pauseButton.setEnabled(false);
runButton.setEnabled(true);
}
else if ( e.getSource() == infoButton ) {
boolean wasPaused = pause;
pause = true;
JOptionPane.showMessageDialog(this, getInfo(), "Information", JOptionPane.INFORMATION_MESSAGE) ;
pause = wasPaused;
}
else
Toolkit.getDefaultToolkit().beep();
}
} // End Inner Class ButtonPanel
/**
*
*/
private class CityPanel extends JPanel {
static final int xMargin = 20;
static final int yMargin = 15;
static final int pSize = 5;
public void paintComponent(Graphics g) {
g.setColor(Color.gray);
g.fillRect(xMargin-1, yMargin-1, cityX*pSize+1, cityY*pSize+1);
for (int x=0; x<cityX; x++)
for (int y=0; y<cityY; y++) {
if (city[x][y]!=null) plot(x,y);
}
}
void plot(int x, int y) {
Graphics g = this.getGraphics();
if (city[x][y]!=null) g.setColor(city[x][y].color);
else g.setColor(Color.gray);
g.fillRect(xMargin+x*pSize, yMargin+y*pSize, pSize-1, pSize-1);
}
}
class Agent {
final Color color;
private int x,y;
Agent(Color color) {
this.color = color;
}
void setPosition(int x, int y) {
this.x = x;
this.y = y;
}
int getX() {
return x;
}
int getY() {
return y;
}
boolean getSatisfaction() {
int stranger = 0;
int similar = 0;
for (int dx=-1;dx<=1;dx++)
for (int dy=-1;dy<=1;dy++) {
int nX=x+dx;
int nY=y+dy;
if (nX<0) nX=cityX-1;
if (nY<0) nY=cityY-1;
if (nX>=cityX) nX=0;
if (nY>=cityY) nY=0;
Agent neighbour = city[nX][nY];
if (neighbour != null) {
if (neighbour.color==this.color)
similar++;
else stranger++;
}
}
boolean satisfaction = (stranger<=similar+1);
return satisfaction;
}
}
private int cityY;
private int cityX;
private Agent [][] city;
private CityPanel cityPanel;
private Thread runner;
private int iterations=0;
private boolean pause=true;
private int blacks;
private int whites;
public void init() {
System.out.println("init");
String widthString = getParameter("myWidth");
String heightString = getParameter("myHeight");
String blacksParameter = getParameter("blacks");
String whitesParameter = getParameter("whites");
cityY = Integer.parseInt(widthString);
cityX = Integer.parseInt(heightString);
city = new Agent [cityX][cityY];
try {
javax.swing.SwingUtilities.invokeAndWait(new Runnable() {
public void run() {
createGUI();
}
});
} catch (Exception e) {
System.err.println("createGUI didn't successfully complete");
}
blacks = Integer.parseInt(blacksParameter);
whites = Integer.parseInt(whitesParameter);
populate(blacks,whites);
}
private String getInfo() {
String nl=System.getProperty("line.separator");
String info =
"Population:"+nl+
" Blacks:"+blacks+nl+
" Whites:"+whites+nl+
" Total:"+(blacks+whites)+nl+nl+
"Simulation size:"+nl+
" Eight:"+cityX+nl+
" Width:"+cityY+nl+
" Total:"+(cityX*cityY)+nl+
" Vacancies:"+((cityX*cityY)-(blacks+whites))+nl+nl+
"Iterations:"+iterations
;
return info;
}
public void start() {
if (runner == null) {
runner = new Thread(this);
runner.start();
}
}
public void run() {
Thread thisThread = Thread.currentThread();
int count = 0;
while (runner == thisThread) {
if (!pause) action();
count++;if (count>10) {
try {Thread.sleep(1);} catch (InterruptedException e) { }
count=0;
}
}
}
private void action() {
Agent agent = getRandomAgent();
if (!agent.getSatisfaction()) {
move(agent);
}
iterations++;
}
private void move(Agent agent) {
int x=agent.getX();
int y=agent.getY();
this.findFreeLocation(agent);
city[x][y]=null;
cityPanel.plot(x, y);
}
private Agent getRandomAgent() {
do {
int x = getRandomX();
int y = getRandomY();
if (city[x][y]!=null)
return city[x][y];
}
while (true);
}
private void depopulate() {
for (int x=0; x<cityX; x++)
for (int y=0; y<cityY; y++) {
city[x][y]=null;
cityPanel.plot(x, y);
}
}
private void populate(int blacks, int whites) {
int population=blacks+whites;
for (int count = 0; count < population; count ++) {
Agent newAgent;
double p = (double)blacks/(blacks+whites);
double r = Math.random();
if (r<p) {
newAgent = new Agent(Color.BLACK);
blacks--;
}
else {
newAgent = new Agent(Color.WHITE);
whites--;
}
findFreeLocation(newAgent);
}
}
private void findFreeLocation(Agent agent) {
do {
int x = getRandomX();
int y = getRandomY();
if (city[x][y]==null) {
city[x][y] = agent;
agent.setPosition(x, y);
cityPanel.plot(x, y);
break;
}
}
while (true);
}
private int getRandomY() {
return (int) (Math.random()*this.cityY);
}
private int getRandomX() {
return (int) (Math.random()*this.cityX);
}
private void createGUI() {
cityPanel= new CityPanel();
getContentPane().add(cityPanel, BorderLayout.CENTER);
getContentPane().add(new ButtonPanel(), BorderLayout.SOUTH);
}
} |
