我试图使用遗传算法直观地表达旅行商问题。我认为我的大部分时间都已关闭，但我需要减慢重绘（），以便我可以看到每次迭代发生了什么。知道如何在保留doGA（）逻辑的同时实现actionPerformed（）方法吗？
class MyPanel extends JPanel implements ActionListener{
private final static int POINTWIDTH = 8;
private final static Color POINTCOLOR = Color.RED;
private final static Color LINECOLOR = Color.GREEN;
private JLabel label = new JLabel();
private City city,city2,city3,city4,city5,city6,city7,city8,city9,city10,city11,city12,city13,city14,city15,city16,city17,city18,city19,city20;
private Population population;
private ArrayList tempCity = new ArrayList<City>();
private ArrayList tempCity2 = new ArrayList<City>();
int delay = 5000;
Timer timer = new Timer(delay, this);
public void start(){
timer.start();
}
public void doGA(){
city = new City(60, 200);
TourManager.addCity(city);
city2 = new City(180, 200);
TourManager.addCity(city2);
city3 = new City(80, 180);
TourManager.addCity(city3);
city4 = new City(140, 180);
TourManager.addCity(city4);
city5 = new City(20, 160);
TourManager.addCity(city5);
city6 = new City(100, 160);
TourManager.addCity(city6);
city7 = new City(200, 160);
TourManager.addCity(city7);
city8 = new City(140, 140);
TourManager.addCity(city8);
city9 = new City(40, 120);
TourManager.addCity(city9);
city10 = new City(100, 120);
TourManager.addCity(city10);
city11 = new City(180, 100);
TourManager.addCity(city11);
city12 = new City(60, 80);
TourManager.addCity(city12);
city13 = new City(120, 80);
TourManager.addCity(city13);
city14 = new City(180, 60);
TourManager.addCity(city14);
city15 = new City(20, 40);
TourManager.addCity(city15);
city16 = new City(100, 40);
TourManager.addCity(city16);
city17 = new City(200, 40);
TourManager.addCity(city17);
city18 = new City(20, 20);
TourManager.addCity(city18);
city19 = new City(60, 20);
TourManager.addCity(city19);
city20 = new City(160, 20);
TourManager.addCity(city20);
population = new Population(50, true);
for (int i = 0; i < 100; i++) {
population = GA.evolvePopulation(population);
repaint();
System.out.println(population.getFittest().getFitness());
}
}
public void paintComponent(Graphics g){
super.paintComponent(g);
Graphics2D g2 = (Graphics2D) g;
g2.setStroke(new BasicStroke(3));
for(int x = 0; x<19;x++){
g2.setColor(LINECOLOR);
//g2.drawLine(tempCity.get(x).getX(), tempCity.get(x).getY(), tempCity2.get(x).getX(), tempCity2.get(x).getY());
g2.drawLine(population.getFittest().getCity(x).getX(), population.getFittest().getCity(x).getY(), population.getFittest().getCity(x+1).getX(), population.getFittest().getCity(x+1).getY());
g2.setColor(POINTCOLOR);
g2.fillOval(population.getFittest().getCity(x).getX() - POINTWIDTH/2, population.getFittest().getCity(x).getY() - POINTWIDTH/2, POINTWIDTH, POINTWIDTH);
}
g2.setColor(LINECOLOR);
g2.drawLine(population.getFittest().getCity(19).getX(), population.getFittest().getCity(19).getY(), population.getFittest().getCity(0).getX(), population.getFittest().getCity(0).getY());
g2.setColor(POINTCOLOR);
g2.fillOval(population.getFittest().getCity(0).getX() - POINTWIDTH/2, population.getFittest().getCity(0).getY() - POINTWIDTH/2, POINTWIDTH, POINTWIDTH);
}
public void actionPerformed(ActionEvent e){
doGA();
}
}
答案 0 :(得分：3)
基本上，Timer变为你for-loop，因此每次滴答时，都需要增加它的迭代次数并在模型绘制之前更新模型的状态。
这意味着您必须分离代码的初始化和更新阶段，例如......
class MyPanel extends JPanel implements ActionListener{
private final static int POINTWIDTH = 8;
private final static Color POINTCOLOR = Color.RED;
private final static Color LINECOLOR = Color.GREEN;
private JLabel label = new JLabel();
private City city,city2,city3,city4,city5,city6,city7,city8,city9,city10,city11,city12,city13,city14,city15,city16,city17,city18,city19,city20;
private Population population;
private ArrayList tempCity = new ArrayList<City>();
private ArrayList tempCity2 = new ArrayList<City>();
int delay = 5000;
private int iteration = 0;
Timer timer = new Timer(delay, this);
public void start(){
iteration = 0;
timer.start();
}
public void initGA() {
city = new City(60, 200);
TourManager.addCity(city);
city2 = new City(180, 200);
TourManager.addCity(city2);
city3 = new City(80, 180);
TourManager.addCity(city3);
city4 = new City(140, 180);
TourManager.addCity(city4);
city5 = new City(20, 160);
TourManager.addCity(city5);
city6 = new City(100, 160);
TourManager.addCity(city6);
city7 = new City(200, 160);
TourManager.addCity(city7);
city8 = new City(140, 140);
TourManager.addCity(city8);
city9 = new City(40, 120);
TourManager.addCity(city9);
city10 = new City(100, 120);
TourManager.addCity(city10);
city11 = new City(180, 100);
TourManager.addCity(city11);
city12 = new City(60, 80);
TourManager.addCity(city12);
city13 = new City(120, 80);
TourManager.addCity(city13);
city14 = new City(180, 60);
TourManager.addCity(city14);
city15 = new City(20, 40);
TourManager.addCity(city15);
city16 = new City(100, 40);
TourManager.addCity(city16);
city17 = new City(200, 40);
TourManager.addCity(city17);
city18 = new City(20, 20);
TourManager.addCity(city18);
city19 = new City(60, 20);
TourManager.addCity(city19);
city20 = new City(160, 20);
TourManager.addCity(city20);
population = new Population(50, true);
}
public void doGA(){
population = GA.evolvePopulation(population);
repaint();
System.out.println(population.getFittest().getFitness());
}
public void paintComponent(Graphics g){
super.paintComponent(g);
Graphics2D g2 = (Graphics2D) g;
g2.setStroke(new BasicStroke(3));
for(int x = 0; x<19;x++){
g2.setColor(LINECOLOR);
//g2.drawLine(tempCity.get(x).getX(), tempCity.get(x).getY(), tempCity2.get(x).getX(), tempCity2.get(x).getY());
g2.drawLine(population.getFittest().getCity(x).getX(), population.getFittest().getCity(x).getY(), population.getFittest().getCity(x+1).getX(), population.getFittest().getCity(x+1).getY());
g2.setColor(POINTCOLOR);
g2.fillOval(population.getFittest().getCity(x).getX() - POINTWIDTH/2, population.getFittest().getCity(x).getY() - POINTWIDTH/2, POINTWIDTH, POINTWIDTH);
}
g2.setColor(LINECOLOR);
g2.drawLine(population.getFittest().getCity(19).getX(), population.getFittest().getCity(19).getY(), population.getFittest().getCity(0).getX(), population.getFittest().getCity(0).getY());
g2.setColor(POINTCOLOR);
g2.fillOval(population.getFittest().getCity(0).getX() - POINTWIDTH/2, population.getFittest().getCity(0).getY() - POINTWIDTH/2, POINTWIDTH, POINTWIDTH);
}
public void actionPerformed(ActionEvent e){
iteration++;
if (iteration < 100) {
doGA();
} else {
((Timer)e.getSource()).stop();
}
}
}
简短的回答是，不，你不能保持你的doGA方法，它必须改变，没有其他方法可以实现它，但更长的答案是，如果您只是将Timer视为一种奇特的循环类型，那就不那么难了......
答案 1 :(得分：0)
如果您的目标是打电话：
population = GA.evolvePopulation(population);
repaint();
System.out.println(population.getFittest().getFitness());
每秒，例如，你可以使用一个线程：
int i = 0;
Thread thread = new Thread()
{
public void run()
{
if i != 100
{
Thread.sleep(1000); //1000 milliseconds is one second.
System.out.println("Thread Running iteration:" + i );
i++;
population = GA.evolvePopulation(population);
SwingUtilities.invokeLater(new Runnable()
{
public void run()
{
// Here, we can safely update the GUI
// because we'll be called from the
// event dispatch thread
repaint();
}
});
System.out.println(population.getFittest().getFitness());
}
else
{
Thread.currentthread.interrupt()
}
}
}
thread.start();
您也可以使用timer，就像评论中提到的那样：
int delay = 1000; //milliseconds
ActionListener taskPerformer = new ActionListener() {
public void actionPerformed(ActionEvent evt) {
//...Perform a task...
}
};
new Timer(delay, taskPerformer).start();