// Draw Random Circles
// Source code file: MyPanel.java
import javax.swing.*;
import java.awt.*;
import java.util.Random;

public class MyPanel extends JPanel {
    private final int NUM_CIRCLES = 1000;
    
    // Set background color for panel.
    public MyPanel( ) {
        setBackground(Color.white);
    }

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

        // Set up random number generator object.
        Random r = new Random( );
        
        // Define fill colors for circles.
        Color[ ] colors = { new Color(0xffa0a0),
            new Color(0xffffa0), new Color(0xa0ffa0),
            new Color(0xa0ffff), new Color(0xa0a0ff),
            new Color(0xffa0ff)};

        // Draw NUM_CIRCLES circles.
        for(int i = 0; i <= NUM_CIRCLES; i++) {
            int colorIndex = r.nextInt(6);
            int x = r.nextInt(600);
            int y = r.nextInt(600);
            int rad = r.nextInt(100);
            g.setColor(colors[colorIndex]);
            g.fillOval(x - rad, y - rad, 2 * rad, 2 * rad);
            g.setColor(Color.BLACK);
            g.drawOval(x - rad, y - rad, 2 * rad, 2 * rad);
        }
    }
}