# 棋子、区域与 RNG

## 创建和放置 Part

```ts
import { createPart, createRegion } from 'boardgame-core';

const board = createRegion('board', [
    { name: 'row', min: 0, max: 2 },
    { name: 'col', min: 0, max: 2 },
]);

const piece = createPart<{ owner: string }>(
    { regionId: 'board', position: [1, 1], owner: 'white' },
    'piece-1'
);

state.produce(draft => {
    draft.parts[piece.id] = piece;
    draft.board.childIds.push(piece.id);
    draft.board.partMap['1,1'] = piece.id;
});
```

## Part 池

```ts
const pool = createPartPool<{ type: string }>(
    { regionId: 'supply', type: 'kitten' },
    10,
    'kitten'
);

const piece = pool.draw();       // 取出一个
pool.return(piece);              // 放回
pool.remaining();                // 剩余数量
```

## 区域操作

```ts
import { applyAlign, shuffle, moveToRegion, isCellOccupied } from 'boardgame-core';

isCellOccupied(state.parts, 'board', [1, 1]);
applyAlign(handRegion, state.parts);    // 紧凑排列
shuffle(deckRegion, state.parts, rng);  // 打乱
moveToRegion(piece, sourceRegion, targetRegion, [0, 0]);
```

## RNG

```ts
import { createRNG } from 'boardgame-core';

const rng = createRNG(12345);
rng.nextInt(6);   // 0-5
rng.next();       // [0, 1)
```

完整 API 列表详见 [API 参考](./api-reference.md)。