@jharrilim/game-of-life
Version:
Game of life in CLI
135 lines • 5.23 kB
JavaScript
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const Cell_1 = require("./Cell");
const events_1 = require("events");
class CellMap extends events_1.EventEmitter {
constructor(_width, _height) {
super();
this._width = _width;
this._height = _height;
this._cells = [];
this._cycles = 0;
for (let col = 0; col < this._width; col++) {
this._cells[col] = [];
for (let row = 0; row < this._height; row++) {
this._cells[col][row] = new Cell_1.Cell(col, row);
}
}
}
get cells() {
return this._cells;
}
cellAt(x, y) {
if (x === -1) {
x = this._width - 1; // If x went past the left wall, go to the right wall
}
if (x === this._width) {
x = 0; // If x went past the right wall, go to the left wall
}
if (y === -1) {
y = this._height - 1; // If y went past the top wall, go to the bottom wall
}
if (y === this._height) {
y = 0; // If y went past the bottom wall, go to the top wall
}
return this._cells[x][y];
}
resize(width, height) {
const widthDiff = width - this._width;
const heightDiff = height - this._height;
if (widthDiff > 0) { // Add new columns if width has been expanded
// This fills out the box on the right
for (let col = this._width; col < width; col++) {
this._cells[col] = [];
for (let row = 0; row < this._height; row++)
this._cells[col][row] = new Cell_1.Cell(col, row);
}
}
if (heightDiff > 0) { // Add new rows if height has been expanded
// This fills out the box on the bottom
for (let col = 0; col < this._width; col++)
for (let row = this._height; row < height; row++)
this._cells[col][row] = new Cell_1.Cell(col, row);
}
if (widthDiff > 0 && heightDiff > 0) { // Add the box in the bottom right corner if both sizes changed
for (let col = this._width; col < width; col++) {
this._cells[col] = [];
for (let row = this._height; row < height; row++)
this._cells[col][row] = new Cell_1.Cell(col, row);
}
}
if (widthDiff < 0) { // If width shrunk, remove columns
this._cells.splice(-1, Math.abs(widthDiff));
}
if (heightDiff < 0) {
for (let col = 0; col < this._width; col++) {
this._cells[col].splice(-1, Math.abs(heightDiff));
}
}
this._width = width;
this._height = height;
}
cellSurroundings(x, y) {
return [
this.cellAt(x, y + 1),
this.cellAt(x, y - 1),
this.cellAt(x - 1, y + 1),
this.cellAt(x + 1, y + 1),
this.cellAt(x - 1, y - 1),
this.cellAt(x + 1, y - 1),
this.cellAt(x - 1, y),
this.cellAt(x + 1, y) // Right
];
}
seed(initialSeed) {
if (!initialSeed) {
for (let col = 0; col < this._width; col++)
for (let row = 0; row < this._height; row++)
if (Math.round(Math.random()) === 1)
this._cells[col][row].live();
else
this._cells[col][row].die();
}
else {
if (initialSeed instanceof Array)
for (const point of initialSeed)
this._cells[point.x][point.y].live();
else
for (let col = 0; col < this._width; col++)
for (let row = 0; row < this._height; row++)
if (initialSeed > 0 && Math.round(Math.random()) === 1) {
this._cells[col][row].live();
initialSeed--;
}
else {
this._cells[col][row].die();
}
}
return this;
}
cycle() {
const newState = this._cells.map(col => [...col]);
newState.forEach(col => col.forEach(this._applyCellRules.bind(this)));
this._cells = newState;
this._cycles++;
this.emit('cycle', this._cycles);
return this;
}
_applyCellRules(cell) {
const { x, y } = cell.position;
const cells = this.cellSurroundings(x, y);
const aliveSurroundings = cells.reduce((prev, curr) => prev + (curr.isAlive ? 1 : 0), 0);
if (aliveSurroundings < 2)
cell.die(); // Underpopulated
else if (aliveSurroundings === 2)
return; // Unchanged
else if (aliveSurroundings === 3)
cell.live(); // Rebirth if dead
else if (aliveSurroundings > 3)
cell.die(); // Overpopulated
else
throw new Error(`Unexpected error in _applyCellRules.\naliveSurroundings:\n\t${aliveSurroundings}\ncell:\n${JSON.stringify(cell, null, 2)}`);
}
}
exports.CellMap = CellMap;
//# sourceMappingURL=CellMap.js.map