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package uk.co.notori.gol;
import javax.swing.*;
import java.awt.*;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.util.Random;
/**
* The grid for Conway's Game of Life
*/
public class Panel extends JPanel implements MouseListener {
public static Dimension rootSize;
private static final int DEFAULT_WIDTH = 40;
private static final int DEFAULT_HEIGHT = 40;
private static final int CELL_SIZE = 15;
private static final Color ALIVE_COLOR = Color.BLACK;
private static final Color DEAD_COLOR = Color.WHITE;
private static final Color GRID_COLOR = Color.GRAY;
private boolean[][] grid;
private boolean[][] nextGrid;
private int width;
private int height;
private boolean running;
private javax.swing.Timer timer;
private int generation;
private int population;
private int updateCounter = 0;
// update UI every 7 frames approx. every other second at medium speed
private static final int UPDATE_FREQUENCY = 7;
private Random random = new Random();
/**
* Create game Panel
*/
public Panel(Dimension rootSize) {
super();
Panel.rootSize = rootSize;
// calculate width and height based on screen size
// create space for buttons
this.width = rootSize.width / CELL_SIZE;
this.height = (rootSize.height - 100) / CELL_SIZE;
grid = new boolean[width][height];
nextGrid = new boolean[width][height];
// size of the grid
setPreferredSize(new Dimension(width * CELL_SIZE, height * CELL_SIZE));
setLayout(null);
running = false;
generation = 0;
population = 0;
// Set up timer for animation
ActionListener animationListener = new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (running) {
evolve();
updatePopulation();
generation++;
repaint();
updateCounter++;
// update UI counters so it's not visually annoying
if (updateCounter >= UPDATE_FREQUENCY) {
updateCounter = 0;
// update the UI with new generation and population count
if (getParent() instanceof MainUI) {
((MainUI) getParent()).updateCounters(generation, population);
}
}
}
}
};
timer = new javax.swing.Timer(300, animationListener);
initializeRandomGrid();
addMouseListener(this);
setVisible(true);
setOpaque(true);
timer.setInitialDelay(1000);
timer.start();
running = true;
}
/**
* Initialize the grid with random cells
*/
public void initializeRandomGrid() {
for (int x = 0; x < width; x++) {
for (int y = 0; y < height; y++) {
grid[x][y] = random.nextDouble() < 0.3;
}
}
updatePopulation();
generation = 0;
updateCounter = 0;
if (getParent() instanceof MainUI) {
((MainUI) getParent()).updateCounters(generation, population);
}
repaint();
}
public void clearGrid() {
for (int x = 0; x < width; x++) {
for (int y = 0; y < height; y++) {
grid[x][y] = false;
}
}
updatePopulation();
generation = 0;
updateCounter = 0;
if (getParent() instanceof MainUI) {
((MainUI) getParent()).updateCounters(generation, population);
}
repaint();
}
private void evolve() {
for (int x = 0; x < width; x++) {
for (int y = 0; y < height; y++) {
int neighbors = countNeighbors(x, y);
if (grid[x][y]) {
nextGrid[x][y] = neighbors == 2 || neighbors == 3;
} else {
nextGrid[x][y] = neighbors == 3;
}
}
}
boolean[][] temp = grid;
grid = nextGrid;
nextGrid = temp;
}
private int countNeighbors(int x, int y) {
int count = 0;
for (int dx = -1; dx <= 1; dx++) {
for (int dy = -1; dy <= 1; dy++) {
if (dx == 0 && dy == 0) continue;
int nx = (x + dx + width) % width;
int ny = (y + dy + height) % height;
if (grid[nx][ny]) {
count++;
}
}
}
return count;
}
private void updatePopulation() {
population = 0;
for (int x = 0; x < width; x++) {
for (int y = 0; y < height; y++) {
if (grid[x][y]) {
population++;
}
}
}
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
// Draw the grid
for (int x = 0; x < width; x++) {
for (int y = 0; y < height; y++) {
if (grid[x][y]) {
g.setColor(ALIVE_COLOR);
} else {
g.setColor(DEAD_COLOR);
}
g.fillRect(x * CELL_SIZE, y * CELL_SIZE, CELL_SIZE, CELL_SIZE);
g.setColor(GRID_COLOR);
g.drawRect(x * CELL_SIZE, y * CELL_SIZE, CELL_SIZE, CELL_SIZE);
}
}
}
public void play() {
if (!running) {
running = true;
timer.start();
}
}
public void pause() {
if (running) {
running = false;
timer.stop();
// force a final update when pausing
if (getParent() instanceof MainUI) {
((MainUI) getParent()).updateCounters(generation, population);
}
}
}
public void reset() {
pause();
initializeRandomGrid();
generation = 0;
updatePopulation();
}
// empty implementations
public void mouseClicked(MouseEvent e) {}
public void mousePressed(MouseEvent e) {}
public void mouseReleased(MouseEvent e) {}
public void mouseEntered(MouseEvent e) {}
public void mouseExited(MouseEvent e) {}
public boolean isRunning() {
return running;
}
public int getGeneration() {
return generation;
}
public int getPopulation() {
return population;
}
public void setSpeed(int delay) {
timer.setDelay(delay);
}
public int getDelay() {
return timer.getDelay();
}
}
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