Re: ChessB oard

"John B. Matthews" <nospam@nospam.invalid>
Mon, 15 Sep 2008 10:03:30 -0400
In article <>,
 Zelda Rottencrotch <> wrote:

[I] was working on the below code when [I] ran
into some [immense] social problems and had had to
put it aside. [N]ow [I] must restart. [A]ny tips?


Separate the view (a grid possibly having screen coordinates) from the
model (a data structure having row and column coordinates corresponding
to a chess board). It may help to factor out the conversions to and from
the two coordinate systems.

In the example below, the coordinate systems are conformal. The view is
a 8x8 grid of JButtons. The model is an empty 8x8 grid of Strings; your
model would contain actual chess piece names. The animation is

A more elaborate example of a grid based game may be found here:


import java.awt.*;
import java.awt.event.*;
import java.util.Random;
import javax.swing.*;

 * Make some buttons!
 * @author John B. Matthews
public class Buttons extends JFrame
    implements ActionListener, ItemListener {

    public static final int ROWS = 8;
    public static final int COLS = ROWS;
    private static final int RATE = 1000 / 20;
    private static final Random random = new Random();
    private static MyButton[][] buttons = new MyButton[ROWS][COLS];

    public static void main(String args[]) {
        new Buttons();

    public Buttons() {
        JFrame frame = new JFrame();
        frame.setSize(600, 600);
        Timer timer = new Timer(RATE, this);

    private JPanel getButtonPanel() {
        JPanel panel = new JPanel(new GridLayout(ROWS, COLS));
        for (int r = 0 ; r < ROWS; r++)
            for (int c = 0 ; c < COLS; c++)
                panel.add(getButton(r, c));
        return panel;

    private MyButton getButton(int row, int col) {
        MyButton b = new MyButton(row, col);
        buttons[row][col] = b;
        return b;

    public void actionPerformed(ActionEvent e) {
        int row = Math.abs(random.nextInt()) % ROWS;
        int col = Math.abs(random.nextInt()) % COLS;
        MyButton b = buttons[row][col];

    public void itemStateChanged(ItemEvent e) {}

class MyButton extends JToggleButton {
    private int row;
    private int col;

    public MyButton(int row, int col) {
        this.row = row;
        this.col= col;
        this.setText(MyModel.getName(row, col));

class MyModel extends Object {
    private static final String[][] chessBoard =
       new String[Buttons.ROWS][Buttons.COLS];

    public static String getName(int row, int col) {
        return "R" + row + "C" + col;
John B. Matthews
trashgod at gmail dot com
home dot woh dot rr dot com slash jbmatthews

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