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‎ChessBoard.java

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import java.awt.Color;
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import java.awt.Dimension;
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import java.awt.GridLayout;
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import java.awt.Image;
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import java.awt.Toolkit;
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import java.awt.BorderLayout;
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import java.awt.Container;
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import java.awt.event.*;
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import java.io.File;
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import java.io.IOException;
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import javax.imageio.ImageIO;
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import javax.swing.JToggleButton;
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import javax.swing.JButton;
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import javax.swing.JLabel;
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import javax.swing.JPanel;
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import javax.swing.JFrame;
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import javax.swing.JToolBar;
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import javax.swing.ImageIcon;
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/*****************************************************************************
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* This is the UI class. It handles all (or as much as possible) of the
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* front-end implementation. It inherits from the JPanel class.
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*****************************************************************************/
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@SuppressWarnings("serial")
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public class ChessBoard extends JPanel{
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private static JLabel message = new JLabel("Ready to play!");
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private static JButton nextButt = new JButton("Next Solution");
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private static JToggleButton clickedButt;
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private static int totalSolutions = 0;
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public static int solCount = 1;
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public static JToggleButton[][] tilesButt = new JToggleButton[8][8];
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/**********************************************************************
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* creates the toolbar for the UI.
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**********************************************************************/
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public static JToolBar toolbar(JFrame frame){
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Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
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frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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JToolBar toolbar = new JToolBar(); // toolbar constructor
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toolbar.setRollover(true); // turn on the rollover visual effect
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toolbar.addSeparator(); // separate toolbar content
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JButton newGameButt = new JButton("New Game"); // construct 'New Game' JButton
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toolbar.add(newGameButt); // add button to toolbar
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toolbar.addSeparator(); // separate toolbar content
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toolbar.add(nextButt); // add button to toolbar (defined as an instance variable)
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nextButt.setEnabled(false); // disable nextButt until user clicks board
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toolbar.addSeparator(); // separate toolbar content
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toolbar.add(message); // add JLabel message to toolbar
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Container contentPane = frame.getContentPane();
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contentPane.add(toolbar, BorderLayout.NORTH);
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frame.setSize(screenSize.width, 150);
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toolbar.setFloatable(false);
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newGameButt.addActionListener( new ActionListener() {// add action listener
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@Override // override other buttons(/methods with same name)
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public void actionPerformed(ActionEvent e) {
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clearBoard(); // revert board to original
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Queen.resetData(); // reset stack and list to null
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nextButt.setEnabled(false); // re-disable next solution button
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clickedButt.setEnabled(true); // re-enable clicked button
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solCount = 1; // reset solCount
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setMSG("Ready to Play!"); // set UI message
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}
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});
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nextButt.addActionListener( new ActionListener() { // add action listener
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@Override // override other buttons(/methods with same name)
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public void actionPerformed(ActionEvent e) {
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Queen.iterate(); // get and print next solution in Queen.
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solCount++; // increment solCount
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setMSG("Solution " + solCount + "/" + totalSolutions); // set UI message
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}
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});
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return toolbar; // return the toolbar to main to be placed into frame
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}
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/*************************************************
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* Setter method: For 'totalSolutions' variable.
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*************************************************/
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public static void setTotSol(int x){
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totalSolutions = x; // set totalSolutions as provided int
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}
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/************************************************************
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* Setter method: Alters message at top of UI.
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************************************************************/
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public static void setMSG(String x){
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message.setText(x); // set message as provided string
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}
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/************************************************************
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* Method called when every solution has been displayed.
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************************************************************/
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public static void printEnd(){
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setMSG("Solution " + (solCount) + "/" + totalSolutions); // print current/total solutions
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nextButt.setEnabled(false); // disable nextButt so currently displayed solution isn't cleared
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}
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/**************************************************************
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* Method that clears the board of queen images and selections.
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* Does not enable the clicked button to retain its colour.
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**************************************************************/
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public static void clearBoard(){
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for (int x = 0; x < 8; x++) { // loop over board,
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for (int y = 0; y < 8; y++) {
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JToggleButton temp = tilesButt[x][y]; // each button..
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temp.setIcon(null); // remove icon
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temp.setSelected(false); // removes selections
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if(temp != clickedButt){ // unless the clicked button; enable
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temp.setEnabled(true);
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}
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}
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}
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}
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/********************************************************************************
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* ChessBoard object. This is the checkered grid of the Chessboard, created from
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* 8x8 grid of JToggleButtons that the user can interact with.
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********************************************************************************/
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public ChessBoard() { // constructor
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Dimension dims = new Dimension(64, 64); // instantize dimension for tiles
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setLayout(new GridLayout(8, 8)); // set the board layout
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for (int x = 0; x < 8; x++) { // loop through the 8 x 8 grid..
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for (int y = 0; y < 8; y++) {
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JToggleButton b = new JToggleButton(); // button to add to each tile
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b.setPreferredSize(dims); // set dimension for tiles
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b.setMinimumSize(dims); // set minimum dimension for tiles
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if ((x + y + 1) % 2 == 0) { // set the checkered colours for the board
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b.setBackground(Color.WHITE);
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} else {
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b.setBackground(Color.BLACK);
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}
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add(b); // add button
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tilesButt[x][y] = b; // set location
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final int i = x; // column number (to send to Queen)
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b.addActionListener( new ActionListener() { // adds listener to each button
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@Override
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public void actionPerformed(ActionEvent e) {// when clicked..
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clickedButt = b; // set clicked button variable
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Queen.iterate(b, i); // calls the iterate method from the Queen class to begin the algorithm
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queenIMG(b); // add queen image to board
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b.setEnabled(false); // essentially highlighting the image through the iterations
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nextButt.setEnabled(true); // enables the 'next solution' button
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setMSG("Solution " + solCount + "/" + totalSolutions); // set UI message
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}
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});
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}
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}
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}
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/******************************************************************************
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* method to import and set the queen image. First gets the image from location,
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* scales it down to fit inside the tile (64 x 64) and assigns to an
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* ImageIcon. It then sets this image at inside the required button.
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******************************************************************************/
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public static void queenIMG(JToggleButton q){ // method to import image
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try {
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final Image queenBuff = ImageIO.read(new File("queenIMG.png"));
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Image queenImage = queenBuff.getScaledInstance(64, 64, java.awt.Image.SCALE_SMOOTH);
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final ImageIcon queenIcon = new ImageIcon(queenImage);
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q.setIcon(queenIcon);
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}catch (IOException e){
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System.out.println(e.toString());
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System.out.println("Could not find file 'queenIMG.png'");
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}
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}
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}

‎Main.java

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import java.awt.BorderLayout;
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import javax.swing.JFrame;
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import javax.swing.JToolBar;
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/*******************************************************
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* the main class of the program; where it is run from.
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*******************************************************/
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public class Main{
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public static void main(String[] args) {
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setUI(); // calls method to setup the user interface
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}
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public static void setUI(){ // method to set UI
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JFrame f = new JFrame("Chess"); // new frame to house the UI
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JToolBar tools = ChessBoard.toolbar(f); // create toolbar from 'chessboard' class
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ChessBoard chessBoard = new ChessBoard(); // create chessboard object
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f.add(tools,BorderLayout.PAGE_START); // add toolbar to frame
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f.add(chessBoard); // add chessboard to frame
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f.pack(); // pack frame components
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f.setLocationRelativeTo(null); // ensure position
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f.setVisible(true); // set frame visible
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}
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}

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