// purpose: demonstrate rendering of a randomly colored box

import java.util.*;
import javax.swing.*;
import java.awt.*;
import java.awt.image.*;

public class RandomBox {

    // RGB value base
    public static final int RGB_BASE = 256;

    // ******  desired dimensions and background
    public static final int PICTURE_WIDTH  = 150;
    public static final int PICTURE_HEIGHT = 200;
    public static final Color BACKGROUND_COLOR = Color.BLACK;

    // ****** convenience constant
    public static final int RGB = BufferedImage.TYPE_INT_RGB;

    // method main(): program starting point
    public static void main( String[] args ) throws Exception {
        // ******  set up window
        JFrame window = new JFrame( "Randomly" );

        window.setAlwaysOnTop( true );
        window.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );

        // ****** set up a surface for painting the image
        BufferedImage surface = new BufferedImage(
                            PICTURE_WIDTH, PICTURE_HEIGHT, RGB );

        // ****** get the window to put the surface on its content pane
        ImageIcon icon = new ImageIcon( surface );
        JLabel pane = new JLabel( icon );
        window.setContentPane( pane );

        // ****** size and display the window
        window.pack();
        window.setVisible( true );

        // ******  get a renderer to manipulate the surface's display
        Graphics g = surface.getGraphics();
        pane.setBackground( Color.BLACK );

        // ****** paint the entire surface the background color
        g.setColor( BACKGROUND_COLOR );
        g.fillRect( 0, 0, PICTURE_WIDTH, PICTURE_HEIGHT );

        // ****** ready to produce the drawing

        // set description of the box
        int x =  35;
        int y =  45;
        int w =  80;
        int h = 100;

        // ****** get random generator for RGB values
        Random die = new Random();

        // get color using random RGB values
        int red   = die.nextInt( RGB_BASE );
        int green = die.nextInt( RGB_BASE );
        int blue  = die.nextInt( RGB_BASE );

        Color c = new Color( red, green, blue );

        // ****** set the rendering color
        g.setColor( c );

        // ****** draw a filled in rectangle
        g.fillRect( x, y, w, h );

        // ****** print text representation of the color
        System.out.println( "color = " + c );
    }
}