Iterated Circles - Mod of Sierpenski Square program

/* CMPT 300X  Chaos  Working with Fractals: Iterated Circle
 *
 * rewrite of Sierpinski Square code to iterate a circular fractal
 Author: Daniel Tanner
 *Note you can mess around with the code here a bit to avoid printing circles inside each other to generate a different fractal pattern (which I kinda like better but... eh).
 */

import javax.swing.JFrame;     //imports for the frame
import java.awt.*;         //imports the colour
import java.awt.Graphics;    //imports the graphics
import java.util.Random;  // imports the random class for random colour

import javax.swing.JPanel;

public class IteratedCircle extends JPanel
{
  public Graphics g;
  public Color c =Color.WHITE; // set colour to white to create the blanks
  public Random r = new Random();
   
  public static void main (String[]args)
  {
     JFrame SS = new JFrame("Drawing with Recursion");
     SS.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     SS.setVisible(true);   //Show the first drawing.
     IteratedCircle S = new IteratedCircle();  //call default constructor (not written);
     SS.setBackground(Color.BLACK);
     SS.add(S);
     SS.setSize(500, 500);  //(width ,height )   */

    //new SFrame();  // call to the frame, program
  }

  public void paint(Graphics g)
  {
    this.g = g;
    // start recursion with first call to draw square
    drawCircle( getWidth() / 2, getHeight() / 2, getWidth() / 4);    
   }
 
  private void drawCircle ( int x, int y ,int radius)
  {
      if (radius > 3) //control when to stop: when size is 2x2 pixels
      {      
      g.setColor(new Color((int)(Math.random() * 255), (int)(Math.random() * 255), (int)(Math.random() * 255)));          //random colour (default is white)
      g.drawRoundRect(x - radius / 2, y - radius / 2, radius, radius, radius * radius, radius / 2);
      drawCircle((int)(x + radius * .75), y, radius / 2);  //draws and fill the square, bigger one
      drawCircle((int)(x - radius * .75), y, radius / 2);
      drawCircle(x, (int)(y + radius * .75), radius / 2);
      drawCircle(x, (int)(y - radius * .75), radius / 2);
      //repaint();
      }
  }
 
  private void drawUpCircle( int x, int y ,int radius)
  {
      if (radius > 1) //control when to stop: when size is 2x2 pixels
      {      
      g.setColor(new Color((int)(Math.random() * 255), (int)(Math.random() * 255), (int)(Math.random() * 255)));          //random colour (default is white)
      g.drawRoundRect(x - radius / 2, y - radius / 2, radius, radius, radius * radius, radius / 2);
      drawUpCircle(x, (int)(y + radius * .75), radius / 2);
      drawRightCircle((int)(x + radius * .75), y, radius / 2);
      drawLeftCircle((int)(x - radius * .75), y, radius / 2);
      //repaint();
      }
  }
 
  private void drawDownCircle( int x, int y ,int radius)
  {
      if (radius > 1) //control when to stop: when size is 2x2 pixels
      {      
      g.setColor(new Color((int)(Math.random() * 255), (int)(Math.random() * 255), (int)(Math.random() * 255)));          //random colour (default is white)
      g.drawRoundRect(x - radius / 2, y - radius / 2, radius, radius, radius * radius, radius / 2);
      drawDownCircle(x, (int)(y - radius * .75), radius / 2);
      drawRightCircle((int)(x + radius * .75), y, radius / 2);
      drawLeftCircle((int)(x - radius * .75), y, radius / 2);
      //repaint();
      }
  }
 
  private void drawLeftCircle( int x, int y ,int radius)
  {
      if (radius > 1) //control when to stop: when size is 2x2 pixels
      {      
          g.setColor(new Color((int)(Math.random() * 255), (int)(Math.random() * 255), (int)(Math.random() * 255)));          //random colour (default is white)
      g.drawRoundRect(x - radius / 2, y - radius / 2, radius, radius, radius * radius, radius / 2);
      drawUpCircle(x, (int)(y + radius * .75), radius / 2);
      drawDownCircle(x, (int)(y - radius * .75), radius / 2);
      drawLeftCircle((int)(x - radius * .75), y, radius / 2);
      //repaint();
      }
  }
 
  private void drawRightCircle( int x, int y ,int radius)
  {
      if (radius > 1) //control when to stop: when size is 2x2 pixels
      {      
          g.setColor(new Color((int)(Math.random() * 255), (int)(Math.random() * 255), (int)(Math.random() * 255)));          //random colour (default is white)
      g.drawRoundRect(x - radius / 2, y - radius / 2, radius, radius, radius * radius, radius / 2);
      drawUpCircle(x, (int)(y + radius * .75), radius / 2);
      drawRightCircle((int)(x + radius * .75), y, radius / 2);
      drawDownCircle(x, (int)(y - radius * .75), radius / 2);
      //repaint();
      }
  }
}//end of class