Friday, August 3, 2012
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(){
           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);
                ellipses[i].setFrame(ellipses[i].getX(), ellipses[i].getY(),
                                     esize[i], esize[i]);
            try {
             }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
    public void paintComponent(Graphics g){
        Graphics2D g2d=(Graphics2D)g;
//clearing previous trails
        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));
//drawing ellipses
    public static void main(String[] args) {
        JFrame f=new JFrame("Bubbles");
        Bubbles b=new Bubbles();
You can also download source file from below links
DOWNLOAD the source from Mediafire
DOWNLOAD the source from 4shared 


  1. is it possible to add bubble effect on a static wallpaper in a theme using this code????

    1. U can add bubbling effect to a static wallpaper in two ways. First way is that, u can draw an image on the panel just before drawing this bubbles. This is very easy and the original image remains same and only the bubbles are added above it. Second way is that, u can use image processing where the bubbles will be drawn on the image in offscreen mode. Thus it will change the original image in 2nd case. in 2nd case BufferedImage can be used to achieve this processing. Try both of it and I will post the 2nd way as soon as possible.


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I am a student of BTech Computer Science Engineering from RCCIIT,Kolkata. I am a crazy lover of Java and wants to settle as a Java developer. I have a seven years Java experience with an application developer experience for 2 years. Recently from March 2012 I am a registered S40 app developer for Nokia and has corrected an app of them. I am currently writing blogs to encourage and grow interest in all those who don't know or learning Java.