Right now I have code to be able to randomize colored squares over a 25x25 board. What I'm trying to do is be able to make those colored squares turn white once pressed on and once it turns white, you can't reverse it. I was thinking about using Listeners but I'm not sure how to start.
Here is what I have to create the randomized squares.
import java.awt.*;
import javax.swing.*;
import java.util.ArrayList;
import java.util.List;
public class ColoredBoxes {
//Selected Colors
private Color[] availableColors = new Color[] {Color.YELLOW, Color.RED, Color.BLUE, Color.GREEN};
public static void main(String[] args) {
new ColoredBoxes();
}
public ColoredBoxes() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Collapse");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
//Size of the board
protected static final int ROWS = 25;
protected static final int COLS = 25;
protected static final int BOX_SIZE = 25;
private List<Color> colors;
//RandomColors across the given board size.
public TestPane() {
int length = ROWS * COLS;
colors = new ArrayList<Color>();
for (int index = 0; index < length; index++) {
int randomColor = (int) (Math.random() * availableColors.length);
colors.add(availableColors[randomColor]);
}
}
@Override
public Dimension getPreferredSize() {
return new Dimension(COLS * BOX_SIZE, ROWS * BOX_SIZE);
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g.create();
int xOffset = (getWidth() - (COLS * BOX_SIZE)) / 2;
int yOffset = (getHeight() - (ROWS * BOX_SIZE)) / 2;
System.out.println("...");
for (int row = 0; row < ROWS; row++) {
for (int col = 0; col < COLS; col++) {
int index = (row * COLS) + col;
g2d.setColor(colors.get(index));
g2d.fillRect(xOffset + (col * BOX_SIZE), yOffset + (row * BOX_SIZE), BOX_SIZE, BOX_SIZE);
}
}
g2d.dispose();
}
}
}
Any help is much appreciated.
To change color on click, you just need a MouseListener, in the mouseClicked() method you must convert the click coordinates to row and column of the color grid, change that color and then ask the component to repaint.
Here the implementation, I just replaced your 1-dimensional color list with a 2-dimension color array, since it simplify the representation and the conversion from x,y to row,col.
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class ColoredBoxes {
//Selected Colors
private Color[] availableColors = new Color[] {Color.YELLOW, Color.RED, Color.BLUE, Color.GREEN};
//This is the color that will be set when a cell is clicked
private static final Color CLICKED_COLOR = Color.white;
public static void main(String[] args) {
new ColoredBoxes();
}
public ColoredBoxes() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Collapse");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
//Size of the board
protected static final int ROWS = 25;
protected static final int COLS = 25;
protected static final int BOX_SIZE = 25;
//Since you have a ROWSxCOLS color grid better use a 2-dimension array
private Color[][] cells;
//RandomColors across the given board size.
public TestPane() {
cells=new Color[ROWS][COLS];
for (int i=0;i<cells.length;i++) {
for (int j=0;j<cells[i].length;j++) {
int randomColor = (int) (Math.random() * availableColors.length);
cells[i][j]=availableColors[randomColor];
}
}
//Here the mouse listener, we only need to manage click events
//so I use a MouseAdapter to not implement the complete MouseListener interface
addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent e) {
onClick(e);
}
});
}
@Override
public Dimension getPreferredSize() {
return new Dimension(COLS * BOX_SIZE, ROWS * BOX_SIZE);
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g.create();
int xOffset = (getWidth() - (COLS * BOX_SIZE)) / 2;
int yOffset = (getHeight() - (ROWS * BOX_SIZE)) / 2;
System.out.println("...");
for (int row = 0; row < ROWS; row++) {
for (int col = 0; col < COLS; col++) {
g2d.setColor(cells[row][col]);
g2d.fillRect(xOffset + (col * BOX_SIZE), yOffset + (row * BOX_SIZE), BOX_SIZE, BOX_SIZE);
}
}
g2d.dispose();
}
//Finally the click handler
protected void onClick(MouseEvent e) {
//Convert mouse x,y (that are relative to the panel) to row and col
int xOffset = (getWidth() - (COLS * BOX_SIZE)) / 2;
int yOffset = (getHeight() - (ROWS * BOX_SIZE)) / 2;
int row=(e.getY()-yOffset)/BOX_SIZE;
int col=(e.getX()-xOffset)/BOX_SIZE;
//Check that we are in the grid
if (row>=0&&row<ROWS&&col>=0&&col<COLS) {
//Set new color
cells[row][col]=Color.white;
//Repaint, only the changed region
repaint(xOffset + (col * BOX_SIZE), yOffset + (row * BOX_SIZE), BOX_SIZE, BOX_SIZE);
}
}
}
}