Created
December 24, 2017 14:26
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World class for the Conway's Game Of Life tutorial on the SSaurel's Channel
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package com.ssaurel.gameoflife; | |
import java.util.ArrayList; | |
import java.util.List; | |
import java.util.Random; | |
public class World { | |
public static final Random RANDOM = new Random(); | |
public int width,height; | |
private Cell[][] board; | |
public World(int width, int height) { | |
this.width = width; | |
this.height = height; | |
board = new Cell[width][height]; | |
init(); | |
} | |
private void init() { | |
for(int i = 0; i < width; i++) { | |
for (int j = 0; j < height; j++) { | |
board[i][j] = new Cell(i, j, RANDOM.nextBoolean()); | |
} | |
} | |
} | |
public Cell get(int i, int j) { | |
return board[i][j]; | |
} | |
public int nbNeighboursOf(int i, int j) { | |
int nb = 0; | |
for (int k = i -1; k <= i +1; k++) { | |
for (int l = j - 1; l <= j +1; l++) { | |
if ((k != i || l != j) && k >= 0 | |
&& k < width && l >=0 && l < height) { | |
Cell cell = board[k][l]; | |
if (cell.alive) { | |
nb++; | |
} | |
} | |
} | |
} | |
return nb; | |
} | |
public void nextGeneration() { | |
List<Cell> liveCells = new ArrayList<Cell>(); | |
List<Cell> deadCells = new ArrayList<Cell>(); | |
for (int i = 0; i < width; i++) { | |
for (int j = 0; j < height; j++) { | |
Cell cell = board[i][j]; | |
int nbNeighbours = nbNeighboursOf(cell.x, cell.y); | |
// rule 1 & rule 3 | |
if (cell.alive && | |
(nbNeighbours < 2 || nbNeighbours > 3)) { | |
deadCells.add(cell); | |
} | |
// rule 2 & rule 4 | |
if ((cell.alive && (nbNeighbours == 3 || nbNeighbours == 2)) | |
|| | |
(!cell.alive && nbNeighbours == 3)) { | |
liveCells.add(cell); | |
} | |
} | |
} | |
// update future live and dead cells | |
for (Cell cell : liveCells) { | |
cell.reborn(); | |
} | |
for (Cell cell : deadCells) { | |
cell.die(); | |
} | |
} | |
} |
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