package test;

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;
import java.awt.image.WritableRaster;
import java.util.Random;

public class SwingTest {
    BufferedImage image = new BufferedImage(200,200, BufferedImage.TYPE_INT_ARGB);

    public static void main(String[] args){
        SwingUtilities.invokeLater(new Runnable(){
            public void run(){
                new SwingTest().init();
            }
        });
    }

    private void init(){
        for(int x=0; x<image.getWidth(); x++)
            for(int y=0; y<image.getHeight(); y++)
                image.setRGB(x, y, 0xFFFFFFFF);

        final JFrame frame = new JFrame();

        frame.add(new ImageFrame(image));

        frame.setPreferredSize(new Dimension(300,300));
        frame.setMinimumSize(new Dimension(300,300));
        frame.pack();
        frame.setVisible(true);

        Timer timer = new Timer(0, new ActionListener(){
            public void actionPerformed(ActionEvent e) {
                frame.repaint();
            }
        });


        timer.start();

        new Thread(new ImagePainter(image, 0,100,0,100, Color.RED)).start();
        new Thread(new ImagePainter(image, 100,200,0,100, Color.BLUE)).start();
        new Thread(new ImagePainter(image, 0,100,100,200, Color.GREEN)).start();
    }
}

class ImageFrame extends JPanel{
    Image image;

    ImageFrame(Image img){
        image = img;
    }

    @Override
    public void paintComponent(Graphics g){
        super.paintComponent(g);

        g.fillRect(0,0,getWidth(), getHeight());

        g.drawImage(image, 25, 25, null);
    }
}

class ImagePainter implements Runnable{
    BufferedImage image;
    int xMin, xMax;
    int yMin, yMax;
    Random rnd;
    Color color;

    ImagePainter(BufferedImage img, int xMin, int xMax, int yMin, int yMax, Color c){
        image = img;
        this.xMin = xMin;
        this.xMax = xMax;
        this.yMin = yMin;
        this.yMax = yMax;
        rnd = new Random();
        color = c;
    }

    public void run(){
        while(true){
            try {
                Thread.sleep((long)(Math.random() * 100));
            } catch (InterruptedException e) {
                e.printStackTrace();
                return;
            }

            int x = rnd.nextInt(xMax - xMin) + xMin;
            int y = rnd.nextInt(yMax - yMin) + yMin;

            image.setRGB(x, y, color.getRGB());
        }
    }
}