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const BOARD_SIZE = 8;
export default class Othello {
public board: Array<Array<'black' | 'white'>>;
/**
* ゲームを初期化します
*/
constructor() {
this.board = [
[null, null, null, null, null, null, null, null],
[null, null, null, null, null, null, null, null],
[null, null, null, null, null, null, null, null],
[null, null, null, 'black', 'white', null, null, null],
[null, null, null, 'white', 'black', null, null, null],
[null, null, null, null, null, null, null, null],
[null, null, null, null, null, null, null, null],
[null, null, null, null, null, null, null, null]
];
}
public setByNumber(color, n) {
const ps = this.getPattern(color);
this.set(color, ps[n][0], ps[n][1]);
}
private write(color, x, y) {
this.board[y][x] = color;
}
/**
* 石を配置します
*/
public set(color, x, y) {
this.write(color, x, y);
const reverses = this.getReverse(color, x, y);
reverses.forEach(r => {
switch (r[0]) {
case 0: // 上
for (let c = 0, _y = y - 1; c < r[1]; c++, _y--) {
this.write(color, x, _y);
}
break;
case 1: // 右上
for (let c = 0, i = 1; c < r[1]; c++, i++) {
this.write(color, x + i, y - i);
}
break;
case 2: // 右
for (let c = 0, _x = x + 1; c < r[1]; c++, _x++) {
this.write(color, _x, y);
}
break;
case 3: // 右下
for (let c = 0, i = 1; c < r[1]; c++, i++) {
this.write(color, x + i, y + i);
}
break;
case 4: // 下
for (let c = 0, _y = y + 1; c < r[1]; c++, _y++) {
this.write(color, x, _y);
}
break;
case 5: // 左下
for (let c = 0, i = 1; c < r[1]; c++, i++) {
this.write(color, x - i, y + i);
}
break;
case 6: // 左
for (let c = 0, _x = x - 1; c < r[1]; c++, _x--) {
this.write(color, _x, y);
}
break;
case 7: // 左上
for (let c = 0, i = 1; c < r[1]; c++, i++) {
this.write(color, x - i, y - i);
}
break;
}
});
}
/**
* 打つことができる場所を取得します
*/
public getPattern(myColor): number[][] {
const result = [];
this.board.forEach((stones, y) => stones.forEach((stone, x) => {
if (stone != null) return;
if (this.canReverse(myColor, x, y)) result.push([x, y]);
}));
return result;
}
/**
* 指定の位置に石を打つことができるかどうか(相手の石を1つでも反転させられるか)を取得します
*/
public canReverse(myColor, targetx, targety): boolean {
return this.getReverse(myColor, targetx, targety) !== null;
}
private getReverse(myColor, targetx, targety): number[] {
const opponentColor = myColor == 'black' ? 'white' : 'black';
const createIterater = () => {
let opponentStoneFound = false;
let breaked = false;
return (x, y): any => {
if (breaked) {
return;
} else if (this.board[y][x] == myColor && opponentStoneFound) {
return true;
} else if (this.board[y][x] == myColor && !opponentStoneFound) {
breaked = true;
} else if (this.board[y][x] == opponentColor) {
opponentStoneFound = true;
} else {
breaked = true;
}
};
};
const res = [];
let iterate;
// 上
iterate = createIterater();
for (let c = 0, y = targety - 1; y >= 0; c++, y--) {
if (iterate(targetx, y)) {
res.push([0, c]);
break;
}
}
// 右上
iterate = createIterater();
for (let c = 0, i = 1; i <= Math.min(BOARD_SIZE - targetx, targety); c++, i++) {
if (iterate(targetx + i, targety - i)) {
res.push([1, c]);
break;
}
}
// 右
iterate = createIterater();
for (let c = 0, x = targetx + 1; x < BOARD_SIZE; c++, x++) {
if (iterate(x, targety)) {
res.push([2, c]);
break;
}
}
// 右下
iterate = createIterater();
for (let c = 0, i = 1; i < Math.min(BOARD_SIZE - targetx, BOARD_SIZE - targety); c++, i++) {
if (iterate(targetx + i, targety + i)) {
res.push([3, c]);
break;
}
}
// 下
iterate = createIterater();
for (let c = 0, y = targety + 1; y < BOARD_SIZE; c++, y++) {
if (iterate(targetx, y)) {
res.push([4, c]);
break;
}
}
// 左下
iterate = createIterater();
for (let c = 0, i = 1; i < Math.min(targetx, BOARD_SIZE - targety); c++, i++) {
if (iterate(targetx - i, targety + i)) {
res.push([5, c]);
break;
}
}
// 左
iterate = createIterater();
for (let c = 0, x = targetx - 1; x >= 0; c++, x--) {
if (iterate(x, targety)) {
res.push([6, c]);
break;
}
}
// 左上
iterate = createIterater();
for (let c = 0, i = 1; i <= Math.min(targetx, targety); c++, i++) {
if (iterate(targetx - i, targety - i)) {
res.push([7, c]);
break;
}
}
return res.length === 0 ? null : res;
}
public toString(): string {
//return this.board.map(row => row.map(state => state === 'black' ? '●' : state === 'white' ? '○' : '┼').join('')).join('\n');
return this.board.map(row => row.map(state => state === 'black' ? '⚫️' : state === 'white' ? '⚪️' : '🔹').join('')).join('\n');
}
public toPatternString(color): string {
//const num = ['０', '１', '２', '３', '４', '５', '６', '７', '８', '９'];
const num = ['0️⃣', '1️⃣', '2️⃣', '3️⃣', '4️⃣', '5️⃣', '6️⃣', '7️⃣', '8️⃣', '9️⃣', '🔟', '🍏', '🍎', '🍐', '🍊', '🍋', '🍌', '🍉', '🍇', '🍓', '🍈', '🍒', '🍑', '🍍'];
const pattern = this.getPattern(color);
return this.board.map((row, y) => row.map((state, x) => {
const i = pattern.findIndex(p => p[0] == x && p[1] == y);
//return state === 'black' ? '●' : state === 'white' ? '○' : i != -1 ? num[i] : '┼';
return state === 'black' ? '⚫️' : state === 'white' ? '⚪️' : i != -1 ? num[i] : '🔹';
}).join('')).join('\n');
}
}
export function ai(color: string, othello: Othello) {
const opponentColor = color == 'black' ? 'white' : 'black';
function think() {
// 打てる場所を取得
const ps = othello.getPattern(color);
if (ps.length > 0) { // 打てる場所がある場合
// 角を取得
const corners = ps.filter(p =>
// 左上
(p[0] == 0 && p[1] == 0) ||
// 右上
(p[0] == (BOARD_SIZE - 1) && p[1] == 0) ||
// 右下
(p[0] == (BOARD_SIZE - 1) && p[1] == (BOARD_SIZE - 1)) ||
// 左下
(p[0] == 0 && p[1] == (BOARD_SIZE - 1))
);
if (corners.length > 0) { // どこかしらの角に打てる場合
// 打てる角からランダムに選択して打つ
const p = corners[Math.floor(Math.random() * corners.length)];
othello.set(color, p[0], p[1]);
} else { // 打てる角がない場合
// 打てる場所からランダムに選択して打つ
const p = ps[Math.floor(Math.random() * ps.length)];
othello.set(color, p[0], p[1]);
}
// 相手の打つ場所がない場合続けてAIのターン
if (othello.getPattern(opponentColor).length === 0) {
think();
}
}
}
think();
}
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