Re: ChessB oard

From:
"John B. Matthews" <nospam@nospam.invalid>
Newsgroups:
comp.lang.java.programmer
Date:
Mon, 15 Sep 2008 10:03:30 -0400
Message-ID:
<nospam-DE85D8.10033015092008@news.motzarella.org>
In article <uoWdnekkkfNgBVDVnZ2dnUVZ_r3inZ2d@comcast.com>,
 Zelda Rottencrotch <beelzibub2@comcast.net> 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
superfluous.

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

<http://robotchase.sourceforge.net/>

<code>
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.setContentPane(getButtonPanel());
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(600, 600);
        frame.setVisible(true);
        Timer timer = new Timer(RATE, this);
        timer.start();
    }

    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;
        b.setBackground(Color.CYAN);
        b.setSelected(random.nextBoolean());
        b.addItemListener(this);
        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];
        b.setSelected(!b.isSelected());
    }

    public void itemStateChanged(ItemEvent e) {}
}

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

    public MyButton(int row, int col) {
        super();
        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;
    }
}
</code>
--
John B. Matthews
trashgod at gmail dot com
home dot woh dot rr dot com slash jbmatthews

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