1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
|
/**
* 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
*/
/**
* @fileoverview The world is the interface to interact with the simulation
* game. It is responsible for managing the game loop, emitting events, and
* controlling the game state (rules and cells) in real-time, without coupling
* downstream users to the game's internal state.
*
* @package life2
*/
import {Board} from './board';
import {Cell} from './cell';
import {Rule} from './rule';
import {RulesManager} from './rules_manager';
/**
* Stats about a board in general, and a state in particular.
* @typedef {Object} Stats
* @property {number} birthACount The number of cells that became TEAM_A.
* @property {number} deathACount The number of cells from TEAM_A that died.
* @property {number} birthBCount The number of cells that became TEAM_B.
* @property {number} deathBCount The number of cells from TEAM_B that died.
* @const
*/
export let Stats;
/**
* The World class is the main interface to interact with the game state in
* real-time without coupling the game's internal state to external
* applications. The World is also the main manager of the game loop and
* applies the rules to the cells.
*/
export class World {
/**
* Initializes the game world with a board and rules.
* @param {!Board} board The game board.
* @param {?Array<!Rule>} rules A list of rules to add and enable by default.
*/
constructor(board, rules) {
/**
* The game board.
* @type {!Board}
*/
this.board = board;
/**
* The game rules.
* @type {!RulesManager}
*/
this.rules = new RulesManager(rules);
// Stats
/**
* The amount of cells from TEAM_A that died in the last game iteration.
* @type {number}
*/
this.deathACount_ = 0;
/**
* The amount of cells from TEAM_B that died in the last game iteration.
* @type {number}
*/
this.deathBCount_ = 0;
/**
* The amount of cells that became from TEAM_A in the last game iteration.
* @type {number}
*/
this.birthACount_ = 0;
/**
* The amount of cells that became TEAM_A in the last game iteration.
* @type {number}
*/
this.birthBCount_ = 0;
}
/**
* Given a list of cell states, reduces the list to the most occurring one.
* @param {!Array<!Cell>} states The list of states.
* @return {!Cell}
* @private
*/
reduceStates_(states) {
let countA = 0;
let countB = 0;
let countEmpty = 0;
// One loop is better than three ".filter"s btw.
for (const state of states) {
if (state === Cell.ALIVE) {
countA++;
} else if (state === Cell.DEAD) {
countB++;
} else {
countEmpty++;
}
}
return Math.max(countA, countB, countEmpty);
}
/**
* Calculates the next state of the game and applies it to the board.
*/
nextState() {
const rules = this.rules.getAll();
const width = this.board.getWidth();
const height = this.board.getHeight();
const newGrid = this.board.getGrid();
for (let x = 0; x < width; x++) {
for (let y = 0; y < height; y++) {
if (this.board.isOutOfBounds(x, y)) continue;
const cell = this.board.getCell(x, y);
if (cell === Cell.EMPTY) continue;
const neighbors = this.board.getNeighbors(x, y);
const states = rules.map((rule) => rule.execute(cell, neighbors))
.filter((state) => state != null);
const newCell = this.reduceStates_(states);
if (newCell === Cell.EMPTY && cell === Cell.TEAM_A) {
this.deathACount_ += 1;
} else if (newCell === Cell.EMPTY && cell === Cell.TEAM_B) {
this.deathBCount_ += 1;
} else if (newCell === Cell.TEAM_A && cell !== Cell.TEAM_A) {
this.birthACount_ += 1;
} else if (newCell === Cell.TEAM_B && cell !== Cell.TEAM_B) {
this.birthBCount_ += 1;
}
newGrid[x][y] = newCell;
}
}
this.board.setGrid(newGrid);
}
/**
* Returns the stats of the world and of the last nextState().
* @return {!Stats}
*/
getStats() {
return {
birthACount: this.birthACount_,
deathACount: this.deathACount_,
birthBCount: this.birthBCount_,
deathBCount: this.deathBCount_,
};
}
}
|
