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/**
* Copyright 2024 The Life2 Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* @license
*/
/**
* The possible states of a cell in the world.
* @readonly
* @enum {string}
*/
export const CELL_STATES = {
/** The cell is empty, possible because it never was filled or it died. */
EMPTY: ".",
/** The cell is occupied by a member of team A. */
TEAM_A: "a",
/** The cell is occupied by a member of team B. */
TEAM_B: "b",
/** The cell is a barrier, and it cannot be occupied by any entity,
* nor can it be modified by rules. */
BARRIER: "#",
};
/**
* A board is an array of strings, where each string represents a row of the
* board, and each character in the string represents a cell in the row.
* @typedef {Array<CELL_STATES>} Board
*/
/**
* The representation of the world, where all the entities live, and where the
* simulation takes place.
*/
export class World {
/**
* Create a new world with the given width and height.
* @constructor
* @param {number} width - The width of the world.
* @param {number} height - The height of the world.
*/
constructor(width, height) {
// TODO(nc0) Support different types of boards, not just 2D
/**
* The width of the world board.
* @type {number}
* @readonly
*/
this.width = width;
/**
* The height of the world board.
* @type {number}
* @readonly
*/
this.height = height;
/**
* The board of the world, where all the entities live.
* @type {Board}
* @private
*/
this.board = this.newBoard(width, height);
}
/**
* Create a new board with the given width and height, initializing all
* the cells to be empty.
* @param {number} width - The width of the board.
* @param {number} height - The height of the board.
* @returns {Board} The new board.
*/
newBoard(width, height) {
return new Array(width).fill(CELL_STATES.EMPTY.repeat(height));
}
/**
* Returns the cell at the given coordinates.
* @param {number} x - The x coordinate of the cell.
* @param {number} y - The y coordinate of the cell.
* @returns {CELL_STATES | null} The cell at the given coordinates,
* or null if the coordinates are out of bounds.
*/
getCell(x, y) {
if (x < 0 || x > this.width ||
y < 0 || y > this.height) return null;
return this.board[x][y];
}
/**
* Returns the cells that are adjacent to the given coordinates.
* @param {number} x - The x coordinate of the cell.
* @param {number} y - The y coordinate of the cell.
* @returns {Array<(number, number)>} The cells that are adjacent to the given
* coordinates.
*/
getNeighbors(x, y) {
// TODO(nc0): Avoid hardcoding the 8 neighbors, check the bounds, ...
return [(x - 1, y - 1), (x, y - 1), (x + 1, y - 1),
(x - 1, y), /* (x, y) */ (x + 1, y),
(x - 1, y + 1), (x, y + 1), (x + 1, y + 1)]
.filter((x, y) => this.getCell(x, y) !== null);
}
/**
*
*/
nextState() {
// TODO(nc0): Implement various rules for the next state
const newBoard = this.newBoard(this.width, this.height);
for (let x = 0; x < this.width; x++) {
for (let y = 0; y < this.height; y++) {
const cell = this.getCell(x, y);
const neighbors = this.getNeighbors(x, y);
neighbors;
// Apply the rules to the cell and its neighbors
// and update the new board
newBoard[x][y] = cell;
}
}
this.board = newBoard;
}
}
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