在绘画组件上使用计时器 [英] Using Timer on a Paint Component

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本文介绍了在绘画组件上使用计时器的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我正在尝试使用遗传算法直观地描述旅行商的问题.我想我把其中的大部分都记下来了,但是我需要放慢repaint()的速度,这样我才能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?

I'm trying to make a visual representation of the traveling salesman problem using a genetic algorithm. I think I got most of it down but I need to slow the repaint() so i can see what's happening each iteration. Any idea how I should implement the actionPerformed() method while retaining the doGA() logic?

 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();

    }

}

推荐答案

基本上,Timer成为您for-loop,因此,每次打勾时,您都需要增加其迭代次数并更新模型的状态,然后再进行修改.画的.

Basically, the Timer becomes you for-loop, so each time it ticks, you need to increment it's iteration and update the state of the model before it's painted.

这意味着您将必须分开代码的初始化和更新阶段,例如...

This means you will HAVE to separate the initialisation and update phases of your code, for example...

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();
        }
    }
}

简短的答案是,不,您不能保持doGA方法原样,必须对其进行更改,根本没有其他方法可以实现,但是更长的答案是,这并不难如果您只是将Timer视为一种奇特的循环...

The short answer would be, no, you can't keep your doGA method as it is, it must be changed, there simply is no other way to achieve it, but the longer answer is, it's not that hard if you simply think of the Timer as a fancy type of loop...

这篇关于在绘画组件上使用计时器的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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