//CirclesLab.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class CirclesLab3 extends JApplet {

    private int circles;
    private JTextField numCirclesText;
    private TextFieldHandler numCirclesHandler;
    private JButton againButton;
    private ButtonHandler againButtonHandler;

    public void init() {
	Container container = getContentPane();
	container.setLayout( new FlowLayout());

	numCirclesText = new JTextField( "12" ,3 );
	container.add( numCirclesText);
	numCirclesHandler = new TextFieldHandler();
	numCirclesText.addActionListener( numCirclesHandler );

	againButton = new JButton( "Again!" );
	container.add( againButton );
	againButtonHandler = new ButtonHandler( );
	againButton.addActionListener( againButtonHandler );
    }

    public void paint( Graphics g )
    {
	super.paint( g );
	
	int x1=0, y1=30, width, height, gap, appletSize;

	appletSize = Math.min(getWidth(),getHeight());
	//width = getWidth()-10;
	//height = getHeight()-30;
	width = appletSize-20;
	height = appletSize-20;
	gap = appletSize/circles/2;
	
	for (int i=0; i<circles; i++) {
	    g.setColor(new Color((int)(Math.random()*256),
				 (int)(Math.random()*256),
				 (int)(Math.random()*256)));
	    g.fillOval(x1,y1,width,height);

	    x1 += gap; 
	    y1 += gap; 
	    width -= 2*gap;
	    height -= 2*gap;
	}
    }

   private class TextFieldHandler implements ActionListener {
       public void actionPerformed (ActionEvent event) {
	   circles = Integer.parseInt(numCirclesText.getText());
	   repaint();
       }
   }
   private class ButtonHandler implements ActionListener {
       public void actionPerformed (ActionEvent event) {
	   repaint();
       }
   }
}