java - 线程和图形

Question

我正在制作一个带有棋盘的小程序(如棋盘，大小为 m x n)，每个字段都必须位于不同的线程中，并且它必须每秒改变颜色，直到我将其关闭。我该怎么做呢？我不能只将 g.setColor 或 g.fillRect 放入 run 方法中。有没有办法通过使用paintComponent方法来绘制整个事物并每秒改变颜色，所有这些都在每个字段的单独线程中进行？

小程序:

import javax.swing.JApplet;

public class MyApplet extends JApplet {

    public void init() {
        add(new Board(  Integer.parseInt(getParameter("m")),
                            Integer.parseInt(getParameter("n")),
                            Integer.parseInt(getParameter("k")),
                            Integer.parseInt(getParameter("p"))
        ));
    }
}

董事会:

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.applet.*;
import java.net.*;
import java.util.Random;

class NowyWatek extends Board implements Runnable{
    public NowyWatek(){
        super(0, 0, 0, 0);
    }
    public void run(){
        Random random=new Random();
        int r1=random.nextInt(255)+0;
        int r2=random.nextInt(255)+0;
        int r3=random.nextInt(255)+0;
        g.setColor(r1, r2, r3);
    }

}

public class Board extends JPanel {
    int m,n,k,p;
    public Board (int m, int n, int k, int p) {
            super();
            this.m = m;
            this.n = n;
            this.k = k;
            this.p = p;
    }

    public void paintComponent(Graphics g)
    {
            int a=0, b=0;
            for(int i=0; i<m*n;i++)
            {
                NowyWatek nowywatek=new NowyWatek();
                Thread thread=new Thread(nowywatek);
                thread.start();
                g.fillRect(a,b,29,29);
                a+=30;
                if(i%n==n-1)
                {
                    a=0;
                    b+=30;
                }
            }
        }
    }

Answer 1

it has to change color every second until I turn it off. How am I suppose to do this with this?

1. 创建 swing Timer更新颜色并调用组件上的repaint
2. 保留对您在 (1) 中更改的 Color 对象的引用
3. 将 Color 对象从 (2) 传递到 paintComponent 中的 g.setColor

例如:

Color color = Color.WHITE;
Random random = new Random();
....
Timer timer = new Timer(1000, new ActionListener(){
    @Override
    public void actionPerformed(ActionEvent arg0) {
        int r1=random.nextInt(255);
        int r2=random.nextInt(255);
        int r3=random.nextInt(255);
        color = new Color(r1, r2, r3);
        repaint();
    }
});
timer.start();
...
public void paintComponent(Graphics g){
    super.paintComponent(g);
    g.setColor(color);
    ...
}