目前，我正致力于创建“生命游戏”版本。但是我的细胞不会出现。
这是我的Cell Class：
class Cell{
boolean alive; //true if cell is alive, false if cell is dead
int numNeighbors; //number of alive neightboring cells
//change alive/dead state of the cell
void setAlive(boolean state){
alive = state;
}
//return alive/dead state of the cell
boolean isAlive(){
return alive;
}
//set numNeightbors of the cell to n
void setNumNeighbors(int n){
numNeighbors = n;
}
//take the cell to the next generation
void update(){
if(numNeighbors <2 || numNeighbors >3){
alive = false;
} else if((numNeighbors == 2 || numNeighbors == 3) && alive == true){
alive = true;
} else if(numNeighbors == 3 && alive == false){
alive = true;
}
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
g.setColor( Color.blue );
g.setOpaque(true);
for(int i = 0; i < row; i++){
for(int j = 0; j < col; j++){
if(grid[i][j].isAlive()){
g.setColor( Color.BLACK);
} else {
g.setColor ( Color.WHITE);
g.fillRect(50, 50, 50*i, 50*j);
}
}
}
}
这是我的GameOfLife Class
<pre>import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import java.io.*;
public class GameOfLife implements MouseListener{
Cell[][] grid; //contain grid of cells
String birthFilename = "birth.txt"; //text file where initial generation is stored
int row; //number of rows
int col; //number of columns
ActionListener actionListener = new ActionListener(){
javax.swing.Timer timer = new javax.swing.Timer(500, this); //new timer
@Override
public void actionPerformed(ActionEvent event){
}
};
public void buildIt() {
int width = 600;
int height = 600;
JFrame frame = new JFrame("Game of Life");
readInitial();
//adds button interface
JPanel buttonbar = new JPanel();
frame.add(buttonbar, BorderLayout.SOUTH);
JButton start = new JButton("Start");
JButton stop = new JButton("Stop");
JButton nextg = new JButton("Next Generation");
buttonbar.add(nextg);
buttonbar.add(start);
buttonbar.add(stop);
JPanel panel = new JPanel();
frame.add(panel);
panel.setPreferredSize(new Dimension(width, height));
panel.setLayout(new GridLayout(row, col, 4, 4));
frame.pack();
frame.setBackground(Color.WHITE);
frame.setVisible(true);
}
public void mousePressed( MouseEvent e) {
//add code to update x and y
}
public void mouseReleased( MouseEvent e) { }
public void mouseClicked( MouseEvent e) { }
public void mouseEntered( MouseEvent e) { }
public void mouseExited( MouseEvent e) { }
//calculate number of living neightbors of each cell and sets numNeighbors
//Does not update dead/live state of cells
void calculateNumNeighbors(){
int numNeighbors = 0;
for(int i = 1; i < row + 1; i++){
for(int j = 1; j < col + 1; j++){
for(int k = -1; k < 2; k++){
for(int m = -1; m < 2; m++){
if(grid[i+k][j+m].isAlive() && !(k == 0 && m == 0)){
numNeighbors++;
}
}
}
grid[i][j].setNumNeighbors(numNeighbors);
}
}
}
//create grid and read initial generation from file
void readInitial(){
try{
grid = new Cell[row + 2][col + 2]; //empty neighbors at corners, so + 2
File file = new File(birthFilename);
Scanner scanner = new Scanner( file );
row = scanner.nextInt();
col = scanner.nextInt();
for(int i = 0; i < row + 2; i++){
for (int j = 0; j < col + 2; j++){
grid[i][j] = new Cell();
}
}
for(int i = 1; i < row + 1; i++){
for (int j = 1; j < col + 1; j++){
if(scanner.next().equals(".")){
grid[i][j].setAlive(false);
} else if(scanner.next().equals("*")){
grid[i][j].setAlive(true);
}
}
}
for(int i = 0; i < row + 2; i++){
grid[0][i].setAlive(false);
grid[row+2][i].setAlive(false);
}
for(int j = 0; j < col + 2; j++){
grid[j][0].setAlive(false);
grid[j][col+2].setAlive(false);
}
} catch(FileNotFoundException e) {
grid = new Cell[12][12];
row = 10;
col = 10;
for(int i = 0; i < 12; i++){
for (int j = 0; j < 12; j++){
grid[i][j] = new Cell();
grid[i][j].setAlive(false);
}
}
}
}
//update grid to the next generation, using the values of numNeightbors in the cells
void nextGeneration(){
for(int i = 1; i < row + 1; i++){
for (int j = 1; j < col + 1; j++){
grid[i][j].update();
}
}
}
public static void main(String[] arg) {
(new GameOfLife()).buildIt();
}
我希望任何人都可以帮助我使这个计划有效。
答案 0 :(得分：5)
我不明白为什么要画画。你有一个具有paintComponent方法的Cell类，但是这个方法没有意义，因为它不是Swing组件的一部分。您的JPanel，您应该在哪里绘图 - 什么都不做。你还有Cell类的其他问题，因为它似乎试图绘制整个网格，而不仅仅是一个单元格。
public void draw(Graphics g)方法。 draw(g)方法。@Override注释。如果你已经完成了这个，在paintComponent之上，编译器会警告你出错了。例如：这是一个没有做生命游戏的小程序，但是显示了一个JPanel保持并显示非组件单元网格的示例。通过“非组件”，SimpleCell类不会从Swing组件扩展，没有任何Swing方法，但如上所述，确实有draw(...)方法，并且可以使用它来绘制自己。它还有一个public boolean contains(Point p)方法，主程序可以在其MouseListener中使用它来决定它是否被点击：
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.*;
@SuppressWarnings("serial")
public class SimpleCellGrid extends JPanel {
private static final int ROWS = 40;
private static final int COLS = 40;
private static final int CELL_WIDTH = 10;
private static final int PREF_W = CELL_WIDTH * COLS;
private static final int PREF_H = CELL_WIDTH * ROWS;
private SimpleCell[][] cellGrid = new SimpleCell[ROWS][COLS];
public SimpleCellGrid() {
MyMouse myMouse = new MyMouse();
addMouseListener(myMouse);
for (int row = 0; row < cellGrid.length; row++) {
for (int col = 0; col < cellGrid[row].length; col++) {
int x = col * CELL_WIDTH;
int y = row * CELL_WIDTH;
cellGrid[row][col] = new SimpleCell(x, y, CELL_WIDTH);
}
}
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2 = (Graphics2D) g;
for (SimpleCell[] cellRow : cellGrid) {
for (SimpleCell simpleCell : cellRow) {
simpleCell.draw(g2);
}
}
}
@Override
public Dimension getPreferredSize() {
if (isPreferredSizeSet()) {
return super.getPreferredSize();
}
return new Dimension(PREF_W, PREF_H);
}
private class MyMouse extends MouseAdapter {
@Override
public void mousePressed(MouseEvent e) {
for (SimpleCell[] cellRow : cellGrid) {
for (SimpleCell simpleCell : cellRow) {
if (simpleCell.contains(e.getPoint())) {
simpleCell.setAlive(!simpleCell.isAlive());
}
}
}
repaint();
}
}
private static void createAndShowGui() {
JFrame frame = new JFrame("SimpleCellGrid");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(new SimpleCellGrid());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> createAndShowGui());
}
}
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.Rectangle;
public class SimpleCell {
private static final Color CELL_COLOR = Color.RED;
private boolean alive = false;
private int x;
private int y;
private int width;
private Rectangle rectangle;
public SimpleCell(int x, int y, int width) {
this.x = x;
this.y = y;
this.width = width;
rectangle = new Rectangle(x, y, width, width);
}
public boolean isAlive() {
return alive;
}
public void setAlive(boolean alive) {
this.alive = alive;
}
public void draw(Graphics2D g2) {
if (alive) {
g2.setColor(CELL_COLOR);
g2.fill(rectangle);
}
}
public boolean contains(Point p) {
return rectangle.contains(p);
}
@Override
public String toString() {
return "SimpleCell [alive=" + alive + ", x=" + x + ", y=" + y + ", width=" + width + ", rectangle=" + rectangle
+ "]";
}
}