Java Code House

Today I am going to post a program that will create bubbles or a bubbling effect. Here I have used Ellipse2D class. A method calculates random coordinates,sizes and strokes of the ellipses. The size of the ellipses goes on increasing till it reaches its maximum value after which it starts from beginning. Each ellipse reaches its maximum size at different times. Each repainting is done after sleep of every 50ms. Related video is given below
Here is the code for you

import java.awt.*;
import java.awt.geom.Ellipse2D;
import javax.swing.*;

public class Bubbles extends JPanel{
  
    private Ellipse2D.Float[] ellipses;
    private double esize[];
    private float estroke[];
    private final double MAX_SIZE=40;
   
    public Bubbles() {
        ellipses = new Ellipse2D.Float[75];
        esize    = new double[ellipses.length];
        estroke  = new  float[ellipses.length];
        for (int i = 0; i < ellipses.length; i++) {
            ellipses[i] = new Ellipse2D.Float();
            getRandomXY(i, 20 * Math.random(),getWidth()-60,getHeight()-60);
        }
    }
    public void build(){
        while(true){
           for (int i = 0; i < ellipses.length; i++) {
            estroke[i] += 0.025f; //increasing stroke
            esize[i]++; //increasing size
            if (esize[i] > MAX_SIZE) //new values if reaches maximum
                getRandomXY(i, 20 * Math.random(),getWidth()-60,getHeight()-60);
            else
                ellipses[i].setFrame(ellipses[i].getX(), ellipses[i].getY(),
                                     esize[i], esize[i]);
           }
           repaint(); //repainting
            try {
               Thread.sleep(50); //sleeping
             }catch (Exception ex) {}
        }
    }
    public void getRandomXY(int i, double size, int w, int h) {
        esize[i] = size;
        estroke[i] = 1.0f; //setting size.strokes,coordinates
        double x = Math.random() * (getWidth()-(MAX_SIZE/2));
        double y = Math.random() * (getHeight()-(MAX_SIZE/2));
        ellipses[i].setFrame(x, y, size, size); //setting ellipse
    }
   
    @Override
    public void paintComponent(Graphics g){
        Graphics2D g2d=(Graphics2D)g;
        //clearing previous trails
        g2d.setColor(Color.black);
        g2d.fillRect(0,0,this.getWidth(),this.getHeight());
        for (int i = 0; i < ellipses.length; i++) {              
               g2d.setStroke(new BasicStroke(estroke[i]));
               int red=(int)(Math.random()*256);
               int green=(int)(Math.random()*256);
               int blue=(int)(Math.random()*256);
               g2d.setColor(new Color(red,green,blue));
               g2d.draw(ellipses[i]); //drawing ellipses
        }
    }
    public static void main(String[] args) {
        JFrame f=new JFrame("Bubbles");
        Bubbles b=new Bubbles();
        f.getContentPane().add(b);
        f.setSize(350,350);
        f.setVisible(true);
        f.setLocationRelativeTo(null);
        f.setDefaultCloseOperation(f.EXIT_ON_CLOSE);
        b.build();
    }
}You can also download source file from below links
DOWNLOAD the source from Mediafire
DOWNLOAD the source from 4shared