docs(modules): 添加框架模块文档 (#350)
* docs(modules): 添加框架模块文档 添加以下模块的完整文档: - FSM (状态机): 状态定义、转换条件、优先级、事件监听 - Timer (定时器): 定时器调度、冷却系统、服务令牌 - Spatial (空间索引): GridSpatialIndex、AOI 兴趣区域管理 - Pathfinding (寻路): A* 算法、网格地图、导航网格、路径平滑 - Procgen (程序化生成): 噪声函数、种子随机数、加权随机 所有文档均基于实际源码 API 编写,包含: - 快速开始示例 - 完整 API 参考 - 实际使用案例 - 蓝图节点说明 - 最佳实践建议 * docs(modules): 添加 Blueprint 模块文档和所有模块英文版 新增中文文档: - Blueprint (蓝图可视化脚本): VM、自定义节点、组合系统、触发器 新增英文文档 (docs/en/modules/): - FSM: State machine API, transitions, ECS integration - Timer: Timers, cooldowns, service tokens - Spatial: Grid spatial index, AOI management - Pathfinding: A*, grid map, NavMesh, path smoothing - Procgen: Noise functions, seeded random, weighted random - Blueprint: Visual scripting, custom nodes, composition 所有文档均基于实际源码 API 编写。
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docs/modules/pathfinding/index.md
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# 寻路系统 (Pathfinding)
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`@esengine/pathfinding` 提供了完整的 2D 寻路解决方案,包括 A* 算法、网格地图、导航网格和路径平滑。
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## 安装
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```bash
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npm install @esengine/pathfinding
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```
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## 快速开始
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### 网格地图寻路
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```typescript
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import { createGridMap, createAStarPathfinder } from '@esengine/pathfinding';
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// 创建 20x20 的网格地图
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const grid = createGridMap(20, 20);
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// 设置障碍物
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grid.setWalkable(5, 5, false);
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grid.setWalkable(5, 6, false);
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grid.setWalkable(5, 7, false);
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// 创建寻路器
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const pathfinder = createAStarPathfinder(grid);
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// 查找路径
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const result = pathfinder.findPath(0, 0, 15, 15);
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if (result.found) {
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console.log('找到路径!');
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console.log('路径点:', result.path);
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console.log('总代价:', result.cost);
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console.log('搜索节点数:', result.nodesSearched);
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}
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```
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### 导航网格寻路
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```typescript
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import { createNavMesh } from '@esengine/pathfinding';
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// 创建导航网格
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const navmesh = createNavMesh();
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// 添加多边形区域
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navmesh.addPolygon([
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{ x: 0, y: 0 }, { x: 10, y: 0 },
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{ x: 10, y: 10 }, { x: 0, y: 10 }
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]);
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navmesh.addPolygon([
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{ x: 10, y: 0 }, { x: 20, y: 0 },
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{ x: 20, y: 10 }, { x: 10, y: 10 }
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]);
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// 自动建立连接
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navmesh.build();
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// 寻路
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const result = navmesh.findPath(1, 1, 18, 8);
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```
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## 核心概念
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### IPoint - 坐标点
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```typescript
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interface IPoint {
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readonly x: number;
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readonly y: number;
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}
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```
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### IPathResult - 寻路结果
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```typescript
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interface IPathResult {
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readonly found: boolean; // 是否找到路径
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readonly path: readonly IPoint[]; // 路径点列表
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readonly cost: number; // 路径总代价
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readonly nodesSearched: number; // 搜索的节点数
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}
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```
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### IPathfindingOptions - 寻路配置
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```typescript
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interface IPathfindingOptions {
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maxNodes?: number; // 最大搜索节点数(默认 10000)
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heuristicWeight?: number; // 启发式权重(>1 更快但可能非最优)
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allowDiagonal?: boolean; // 是否允许对角移动(默认 true)
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avoidCorners?: boolean; // 是否避免穿角(默认 true)
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}
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```
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## 启发式函数
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模块提供了四种启发式函数:
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| 函数 | 适用场景 | 说明 |
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|------|----------|------|
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| `manhattanDistance` | 4方向移动 | 曼哈顿距离,只考虑水平/垂直 |
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| `euclideanDistance` | 任意方向 | 欧几里得距离,直线距离 |
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| `chebyshevDistance` | 8方向移动 | 切比雪夫距离,对角线代价为 1 |
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| `octileDistance` | 8方向移动 | 八角距离,对角线代价为 √2(默认) |
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```typescript
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import { manhattanDistance, octileDistance } from '@esengine/pathfinding';
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// 自定义启发式
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const grid = createGridMap(20, 20, {
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heuristic: manhattanDistance // 使用曼哈顿距离
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});
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```
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## 网格地图 API
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### createGridMap
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```typescript
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function createGridMap(
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width: number,
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height: number,
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options?: IGridMapOptions
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): GridMap
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```
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**配置选项:**
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| 属性 | 类型 | 默认值 | 描述 |
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|------|------|--------|------|
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| `allowDiagonal` | `boolean` | `true` | 允许对角移动 |
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| `diagonalCost` | `number` | `√2` | 对角移动代价 |
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| `avoidCorners` | `boolean` | `true` | 避免穿角 |
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| `heuristic` | `HeuristicFunction` | `octileDistance` | 启发式函数 |
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### 地图操作
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```typescript
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// 检查/设置可通行性
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grid.isWalkable(x, y);
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grid.setWalkable(x, y, false);
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// 设置移动代价(如沼泽、沙地)
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grid.setCost(x, y, 2); // 代价为 2(默认 1)
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// 设置矩形区域
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grid.setRectWalkable(0, 0, 5, 5, false);
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// 从数组加载(0=可通行,非0=障碍)
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grid.loadFromArray([
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[0, 0, 0, 1, 0],
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[0, 1, 0, 1, 0],
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[0, 1, 0, 0, 0]
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]);
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// 从字符串加载(.=可通行,#=障碍)
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grid.loadFromString(`
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.....
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.#.#.
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.#...
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`);
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// 导出为字符串
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console.log(grid.toString());
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// 重置所有节点为可通行
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grid.reset();
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```
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### 方向常量
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```typescript
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import { DIRECTIONS_4, DIRECTIONS_8 } from '@esengine/pathfinding';
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// 4方向(上下左右)
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DIRECTIONS_4 // [{ dx: 0, dy: -1 }, { dx: 1, dy: 0 }, ...]
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// 8方向(含对角线)
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DIRECTIONS_8 // [{ dx: 0, dy: -1 }, { dx: 1, dy: -1 }, ...]
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```
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## A* 寻路器 API
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### createAStarPathfinder
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```typescript
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function createAStarPathfinder(map: IPathfindingMap): AStarPathfinder
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```
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### findPath
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```typescript
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const result = pathfinder.findPath(
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startX, startY,
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endX, endY,
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{
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maxNodes: 5000, // 限制搜索节点数
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heuristicWeight: 1.5 // 加速但可能非最优
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}
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);
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```
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### 重用寻路器
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```typescript
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// 寻路器可重用,内部会自动清理状态
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pathfinder.findPath(0, 0, 10, 10);
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pathfinder.findPath(5, 5, 15, 15);
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// 手动清理(可选)
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pathfinder.clear();
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```
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## 导航网格 API
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### createNavMesh
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```typescript
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function createNavMesh(): NavMesh
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```
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### 构建导航网格
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```typescript
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const navmesh = createNavMesh();
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// 添加凸多边形
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const id1 = navmesh.addPolygon([
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{ x: 0, y: 0 }, { x: 10, y: 0 },
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{ x: 10, y: 10 }, { x: 0, y: 10 }
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]);
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const id2 = navmesh.addPolygon([
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{ x: 10, y: 0 }, { x: 20, y: 0 },
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{ x: 20, y: 10 }, { x: 10, y: 10 }
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]);
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// 方式1:自动检测共享边并建立连接
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navmesh.build();
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// 方式2:手动设置连接
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navmesh.setConnection(id1, id2, {
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left: { x: 10, y: 0 },
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right: { x: 10, y: 10 }
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});
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```
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### 查询和寻路
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```typescript
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// 查找包含点的多边形
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const polygon = navmesh.findPolygonAt(5, 5);
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// 检查位置是否可通行
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navmesh.isWalkable(5, 5);
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// 寻路(内部使用漏斗算法优化路径)
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const result = navmesh.findPath(1, 1, 18, 8);
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```
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## 路径平滑 API
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### 视线简化
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移除不必要的中间点:
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```typescript
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import { createLineOfSightSmoother } from '@esengine/pathfinding';
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const smoother = createLineOfSightSmoother();
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const smoothedPath = smoother.smooth(result.path, grid);
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// 原路径: [(0,0), (1,1), (2,2), (3,3), (4,4)]
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// 简化后: [(0,0), (4,4)]
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```
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### 曲线平滑
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使用 Catmull-Rom 样条曲线:
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```typescript
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import { createCatmullRomSmoother } from '@esengine/pathfinding';
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const smoother = createCatmullRomSmoother(
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5, // segments - 每段插值点数
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0.5 // tension - 张力 (0-1)
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);
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const curvedPath = smoother.smooth(result.path, grid);
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```
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### 组合平滑
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先简化再曲线平滑:
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```typescript
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import { createCombinedSmoother } from '@esengine/pathfinding';
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const smoother = createCombinedSmoother(5, 0.5);
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const finalPath = smoother.smooth(result.path, grid);
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```
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### 视线检测函数
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```typescript
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import { bresenhamLineOfSight, raycastLineOfSight } from '@esengine/pathfinding';
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// Bresenham 算法(快速,网格对齐)
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const hasLOS = bresenhamLineOfSight(x1, y1, x2, y2, grid);
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// 射线投射(精确,支持浮点坐标)
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const hasLOS = raycastLineOfSight(x1, y1, x2, y2, grid, 0.5);
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```
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## 实际示例
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### 游戏角色移动
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```typescript
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class MovementSystem {
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private grid: GridMap;
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private pathfinder: AStarPathfinder;
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private smoother: CombinedSmoother;
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constructor(width: number, height: number) {
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this.grid = createGridMap(width, height);
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this.pathfinder = createAStarPathfinder(this.grid);
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this.smoother = createCombinedSmoother();
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}
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findPath(from: IPoint, to: IPoint): IPoint[] | null {
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const result = this.pathfinder.findPath(
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from.x, from.y,
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to.x, to.y
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);
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if (!result.found) {
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return null;
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}
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// 平滑路径
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return this.smoother.smooth(result.path, this.grid);
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}
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setObstacle(x: number, y: number): void {
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this.grid.setWalkable(x, y, false);
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}
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setTerrain(x: number, y: number, cost: number): void {
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this.grid.setCost(x, y, cost);
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}
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}
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```
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### 动态障碍物
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```typescript
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class DynamicPathfinding {
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private grid: GridMap;
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private pathfinder: AStarPathfinder;
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private dynamicObstacles: Set<string> = new Set();
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addDynamicObstacle(x: number, y: number): void {
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const key = `${x},${y}`;
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if (!this.dynamicObstacles.has(key)) {
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this.dynamicObstacles.add(key);
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this.grid.setWalkable(x, y, false);
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}
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}
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removeDynamicObstacle(x: number, y: number): void {
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const key = `${x},${y}`;
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if (this.dynamicObstacles.has(key)) {
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this.dynamicObstacles.delete(key);
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this.grid.setWalkable(x, y, true);
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}
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}
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findPath(from: IPoint, to: IPoint): IPathResult {
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return this.pathfinder.findPath(from.x, from.y, to.x, to.y);
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}
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}
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```
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### 不同地形代价
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```typescript
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// 设置不同地形的移动代价
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const grid = createGridMap(50, 50);
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// 普通地面 - 代价 1(默认)
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// 沙地 - 代价 2
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for (let y = 10; y < 20; y++) {
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for (let x = 0; x < 50; x++) {
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grid.setCost(x, y, 2);
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}
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}
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// 沼泽 - 代价 4
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for (let y = 30; y < 35; y++) {
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for (let x = 20; x < 30; x++) {
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grid.setCost(x, y, 4);
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}
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}
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// 寻路时会自动考虑地形代价
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const result = pathfinder.findPath(0, 0, 49, 49);
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```
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### 分层寻路
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对于大型地图,使用层级化寻路:
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```typescript
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class HierarchicalPathfinding {
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private coarseGrid: GridMap; // 粗粒度网格
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private fineGrid: GridMap; // 细粒度网格
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private coarsePathfinder: AStarPathfinder;
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private finePathfinder: AStarPathfinder;
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private cellSize = 10;
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findPath(from: IPoint, to: IPoint): IPoint[] {
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// 1. 在粗粒度网格上寻路
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const coarseFrom = this.toCoarse(from);
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const coarseTo = this.toCoarse(to);
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const coarseResult = this.coarsePathfinder.findPath(
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coarseFrom.x, coarseFrom.y,
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coarseTo.x, coarseTo.y
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);
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if (!coarseResult.found) {
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return [];
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}
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// 2. 在每个粗粒度单元内进行细粒度寻路
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const finePath: IPoint[] = [];
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// ... 详细实现略
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return finePath;
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}
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private toCoarse(p: IPoint): IPoint {
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return {
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x: Math.floor(p.x / this.cellSize),
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y: Math.floor(p.y / this.cellSize)
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||||
};
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||||
}
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||||
}
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||||
```
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## 蓝图节点
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||||
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||||
Pathfinding 模块提供了可视化脚本支持的蓝图节点:
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||||
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||||
- `FindPath` - 查找路径
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- `FindPathSmooth` - 查找并平滑路径
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- `IsWalkable` - 检查位置是否可通行
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||||
- `GetPathLength` - 获取路径点数
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- `GetPathDistance` - 获取路径总距离
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||||
- `GetPathPoint` - 获取路径上的指定点
|
||||
- `MoveAlongPath` - 沿路径移动
|
||||
- `HasLineOfSight` - 检查视线
|
||||
|
||||
## 性能优化
|
||||
|
||||
1. **限制搜索范围**
|
||||
```typescript
|
||||
pathfinder.findPath(x1, y1, x2, y2, { maxNodes: 1000 });
|
||||
```
|
||||
|
||||
2. **使用启发式权重**
|
||||
```typescript
|
||||
// 权重 > 1 会更快但可能不是最优路径
|
||||
pathfinder.findPath(x1, y1, x2, y2, { heuristicWeight: 1.5 });
|
||||
```
|
||||
|
||||
3. **复用寻路器实例**
|
||||
```typescript
|
||||
// 创建一次,多次使用
|
||||
const pathfinder = createAStarPathfinder(grid);
|
||||
```
|
||||
|
||||
4. **使用导航网格**
|
||||
- 对于复杂地形,NavMesh 比网格寻路更高效
|
||||
- 多边形数量远少于网格单元格数量
|
||||
|
||||
5. **选择合适的启发式**
|
||||
- 4方向移动用 `manhattanDistance`
|
||||
- 8方向移动用 `octileDistance`(默认)
|
||||
|
||||
## 网格 vs 导航网格
|
||||
|
||||
| 特性 | GridMap | NavMesh |
|
||||
|------|---------|---------|
|
||||
| 适用场景 | 规则瓦片地图 | 复杂多边形地形 |
|
||||
| 内存占用 | 较高 (width × height) | 较低 (多边形数) |
|
||||
| 精度 | 网格对齐 | 连续坐标 |
|
||||
| 动态修改 | 容易 | 需要重建 |
|
||||
| 设置复杂度 | 简单 | 较复杂 |
|
||||
Reference in New Issue
Block a user