feat: add recursive division maze generator

PROJECT_DESCRIPTION.md

@@ -36,7 +36,7 @@ npm run build
 | Need | Algorithm(s) | Module | Example |
 | ---- | ------------ | ------ | ------- |
 | Grid pathfinding | `astar`, `dijkstra`, `jumpPointSearch`, `computeFlowField`, `buildNavMesh`, `findNavMeshPath`, `manhattanDistance`, `gridFromString` | `pathfinding/astar.ts`, `pathfinding/dijkstra.ts`, `pathfinding/jumpPointSearch.ts`, `pathfinding/flowField.ts`, `pathfinding/navMesh.ts` | `examples/astar.ts`, `examples/flowField.ts`, `examples/navMesh.ts` |
-| Procedural textures & terrain | `perlin`, `perlin3D`, `simplex2D`, `simplex3D`, `worley`, `worleySample`, `waveFunctionCollapse`, `cellularAutomataCave`, `poissonDiskSampling`, `computeVoronoiDiagram`, `diamondSquare`, `generateLSystem`, `generateBspDungeon`, `generateRecursiveMaze`, `generatePrimMaze`, `generateKruskalMaze`, `generateWilsonMaze`, `generateAldousBroderMaze` | `procedural/*.ts` | `examples/simplex.ts`, `examples/worley.ts`, `examples/waveFunctionCollapse.ts`, `examples/cellularAutomata.ts`, `examples/poissonDisk.ts`, `examples/voronoi.ts`, `examples/diamondSquare.ts`, `examples/lSystem.ts`, `examples/dungeonBsp.ts`, `examples/mazeRecursive.ts`, `examples/mazePrim.ts`, `examples/mazeKruskal.ts`, `examples/mazeWilson.ts`, `examples/mazeAldous.ts` |
+| Procedural textures & terrain | `perlin`, `perlin3D`, `simplex2D`, `simplex3D`, `worley`, `worleySample`, `waveFunctionCollapse`, `cellularAutomataCave`, `poissonDiskSampling`, `computeVoronoiDiagram`, `diamondSquare`, `generateLSystem`, `generateBspDungeon`, `generateRecursiveMaze`, `generatePrimMaze`, `generateKruskalMaze`, `generateWilsonMaze`, `generateAldousBroderMaze`, `generateRecursiveDivisionMaze` | `procedural/*.ts` | `examples/simplex.ts`, `examples/worley.ts`, `examples/waveFunctionCollapse.ts`, `examples/cellularAutomata.ts`, `examples/poissonDisk.ts`, `examples/voronoi.ts`, `examples/diamondSquare.ts`, `examples/lSystem.ts`, `examples/dungeonBsp.ts`, `examples/mazeRecursive.ts`, `examples/mazePrim.ts`, `examples/mazeKruskal.ts`, `examples/mazeWilson.ts`, `examples/mazeAldous.ts`, `examples/mazeDivision.ts` |
 | Spatial queries & collision | `Quadtree`, `aabbCollision`, `aabbIntersection`, `satCollision`, `circleRayIntersection`, `sweptAABB` | `spatial/*.ts` | `examples/sat.ts` |
 | Web performance & UI throttling | `debounce`, `throttle`, `LRUCache`, `memoize`, `deduplicateRequest`, `clearRequestDedup`, `calculateVirtualRange` | `util/*.ts` | `examples/requestDedup.ts`, `examples/virtualScroll.ts` |
 | Text & search | `fuzzySearch`, `fuzzyScore`, `Trie`, `binarySearch`, `levenshteinDistance` | `search/*.ts` | `examples/search.ts` |

README.md

@@ -25,7 +25,7 @@ CDN usage:
 | Goal | Algorithms | Import From | Example |
 | ---- | ---------- | ----------- | ------- |
 | Pathfinding & navigation | `astar`, `dijkstra`, `jumpPointSearch`, `computeFlowField`, `buildNavMesh`, `findNavMeshPath`, `manhattanDistance`, `gridFromString` | `pathfinding/astar.ts`, `pathfinding/dijkstra.ts`, `pathfinding/jumpPointSearch.ts`, `pathfinding/flowField.ts`, `pathfinding/navMesh.ts` | `examples/astar.ts`, `examples/flowField.ts`, `examples/navMesh.ts` |
-| Procedural generation | `perlin`, `perlin3D`, `simplex2D`, `simplex3D`, `worley`, `worleySample`, `waveFunctionCollapse`, `cellularAutomataCave`, `poissonDiskSampling`, `computeVoronoiDiagram`, `diamondSquare`, `generateLSystem`, `generateBspDungeon`, `generateRecursiveMaze`, `generatePrimMaze`, `generateKruskalMaze`, `generateWilsonMaze`, `generateAldousBroderMaze` | `procedural/*.ts` | `examples/simplex.ts`, `examples/worley.ts`, `examples/waveFunctionCollapse.ts`, `examples/cellularAutomata.ts`, `examples/poissonDisk.ts`, `examples/voronoi.ts`, `examples/diamondSquare.ts`, `examples/lSystem.ts`, `examples/dungeonBsp.ts`, `examples/mazeRecursive.ts`, `examples/mazePrim.ts`, `examples/mazeKruskal.ts`, `examples/mazeWilson.ts`, `examples/mazeAldous.ts` |
+| Procedural generation | `perlin`, `perlin3D`, `simplex2D`, `simplex3D`, `worley`, `worleySample`, `waveFunctionCollapse`, `cellularAutomataCave`, `poissonDiskSampling`, `computeVoronoiDiagram`, `diamondSquare`, `generateLSystem`, `generateBspDungeon`, `generateRecursiveMaze`, `generatePrimMaze`, `generateKruskalMaze`, `generateWilsonMaze`, `generateAldousBroderMaze`, `generateRecursiveDivisionMaze` | `procedural/*.ts` | `examples/simplex.ts`, `examples/worley.ts`, `examples/waveFunctionCollapse.ts`, `examples/cellularAutomata.ts`, `examples/poissonDisk.ts`, `examples/voronoi.ts`, `examples/diamondSquare.ts`, `examples/lSystem.ts`, `examples/dungeonBsp.ts`, `examples/mazeRecursive.ts`, `examples/mazePrim.ts`, `examples/mazeKruskal.ts`, `examples/mazeWilson.ts`, `examples/mazeAldous.ts`, `examples/mazeDivision.ts` |
 | Spatial queries & collision | `Quadtree`, `aabbCollision`, `aabbIntersection`, `satCollision`, `circleRayIntersection`, `sweptAABB` | `spatial/*.ts` | `examples/sat.ts` |
 | AI behaviours & crowds | `seek`, `flee`, `arrive`, `pursue`, `wander`, `updateBoids`, `BehaviorTree`, `rvoStep` | `ai/steering.ts`, `ai/boids.ts`, `ai/behaviorTree.ts`, `ai/rvo.ts` | `examples/steering.ts`, `examples/boids.ts`, `examples/rvo.ts` |
 | Web performance & UI | `debounce`, `throttle`, `LRUCache`, `memoize`, `deduplicateRequest`, `clearRequestDedup`, `calculateVirtualRange` | `util/*.ts` | `examples/requestDedup.ts`, `examples/virtualScroll.ts` |
@@ -52,7 +52,7 @@ npm run size        # Enforce bundle size budget
 - Milestone 0.2 next targets crowd-flow integrations (RVO + flow fields) and behaviour-tree decorators for richer AI control.
 - Milestone 0.4 plans a procedural + gameplay systems toolkit (Wave Function Collapse, dungeon suite, L-systems, game loop, camera, particles, inventory, combat, save/load, and more).
 
-Examples live under `examples/` and can be executed with `tsx`/`ts-node` or compiled for the browser. See `examples/astar.ts`, `examples/flowField.ts`, `examples/navMesh.ts`, `examples/cellularAutomata.ts`, `examples/poissonDisk.ts`, `examples/voronoi.ts`, `examples/diamondSquare.ts`, `examples/lSystem.ts`, `examples/dungeonBsp.ts`, `examples/mazeRecursive.ts`, `examples/mazePrim.ts`, `examples/mazeKruskal.ts`, `examples/mazeWilson.ts`, `examples/mazeAldous.ts`, `examples/steering.ts`, `examples/boids.ts`, `examples/requestDedup.ts`, `examples/search.ts`, `examples/graph.ts`, `examples/geometry.ts`, `examples/visual.ts`, `examples/sat.ts`, `examples/simplex.ts`, and `examples/worley.ts` for quick starts. The `examples` registry exported from `src/index.ts` provides a typed index you can traverse programmatically.
+Examples live under `examples/` and can be executed with `tsx`/`ts-node` or compiled for the browser. See `examples/astar.ts`, `examples/flowField.ts`, `examples/navMesh.ts`, `examples/cellularAutomata.ts`, `examples/poissonDisk.ts`, `examples/voronoi.ts`, `examples/diamondSquare.ts`, `examples/lSystem.ts`, `examples/dungeonBsp.ts`, `examples/mazeRecursive.ts`, `examples/mazePrim.ts`, `examples/mazeKruskal.ts`, `examples/mazeWilson.ts`, `examples/mazeAldous.ts`, `examples/mazeDivision.ts`, `examples/steering.ts`, `examples/boids.ts`, `examples/requestDedup.ts`, `examples/search.ts`, `examples/graph.ts`, `examples/geometry.ts`, `examples/visual.ts`, `examples/sat.ts`, `examples/simplex.ts`, and `examples/worley.ts` for quick starts. The `examples` registry exported from `src/index.ts` provides a typed index you can traverse programmatically.
 
 ## Contributing
 1. Fork the repository.

ROADMAP.md

@@ -42,7 +42,7 @@
   - [x] Diamond-square terrain height map generator
   - [x] L-system generator for foliage and organic structures
   - [x] Dungeon generation suite (BSP subdivision, rooms & corridors variants)
-  - [ ] Maze algorithms pack (Recursive backtracking ✅, Prim's ✅, Kruskal's ✅, Wilson's ✅, Aldous–Broder ✅, Recursive Division)
+  - [ ] Maze algorithms pack (Recursive backtracking ✅, Prim's ✅, Kruskal's ✅, Wilson's ✅, Aldous–Broder ✅, Recursive Division ✅)
 - Gameplay systems & utilities:
   - [ ] Fixed-timestep game loop utility with interpolation helpers
   - [ ] Delta-time manager for frame-independent timing

docs/index.d.ts

@@ -56,6 +56,8 @@ export const examples: {
     readonly generatePrimMaze: 'examples/mazePrim.ts';
     readonly generateKruskalMaze: 'examples/mazeKruskal.ts';
     readonly generateWilsonMaze: 'examples/mazeWilson.ts';
+    readonly generateAldousBroderMaze: 'examples/mazeAldous.ts';
+    readonly generateRecursiveDivisionMaze: 'examples/mazeDivision.ts';
   };
   readonly spatial: {
     readonly Quadtree: 'examples/sat.ts';
@@ -645,6 +647,14 @@ export function generateWilsonMaze(options: MazeOptions): MazeResult;
  */
 export function generateAldousBroderMaze(options: MazeOptions): MazeResult;
 
+/**
+ * Generates a maze using recursive division.
+ * Use for: structured mazes with nested chambers.
+ * Performance: O(width × height).
+ * Import: procedural/maze.ts
+ */
+export function generateRecursiveDivisionMaze(options: MazeOptions): MazeResult;
+
 /**
  * Simplex noise generator for smooth gradients without directional artifacts.
  * Use for: large terrain synthesis, animated textures, volumetric noise.

examples/mazeDivision.ts

@@ -0,0 +1,11 @@
+import { generateRecursiveDivisionMaze } from '../src/index.js';
+
+const { grid, start, end } = generateRecursiveDivisionMaze({
+  width: 21,
+  height: 21,
+  seed: 2025,
+});
+
+console.log('Start:', start);
+console.log('End:', end);
+console.log('Sample row:', grid[10]?.join(''));

src/index.ts

@@ -53,6 +53,7 @@ export const examples = {
     generateKruskalMaze: 'examples/mazeKruskal.ts',
     generateWilsonMaze: 'examples/mazeWilson.ts',
     generateAldousBroderMaze: 'examples/mazeAldous.ts',
+    generateRecursiveDivisionMaze: 'examples/mazeDivision.ts',
   },
   spatial: {
     Quadtree: 'examples/sat.ts',
@@ -314,6 +315,13 @@ export { generateWilsonMaze } from './procedural/maze.js';
  */
 export { generateAldousBroderMaze } from './procedural/maze.js';
 
+/**
+ * Recursive division maze generator for structured layouts.
+ *
+ * Example file: examples/mazeDivision.ts
+ */
+export { generateRecursiveDivisionMaze } from './procedural/maze.js';
+
 // ============================================================================
 // 🎯 SPATIAL & COLLISION
 // ============================================================================

src/procedural/maze.ts

@@ -296,6 +296,40 @@ export function generateAldousBroderMaze({
   return { grid, start, end };
 }
 
+/**
+ * Generates a maze using recursive division.
+ * Useful for: structured mazes with nested chambers and corridors.
+ */
+export function generateRecursiveDivisionMaze({
+  width,
+  height,
+  seed = Date.now(),
+}: MazeOptions): MazeResult {
+  validateDimensions(width, height);
+
+  const grid = Array.from({ length: height }, () => Array<number>(width).fill(PATH));
+  const random = createLinearCongruentialGenerator(seed);
+
+  // Surround with walls
+  for (let x = 0; x < width; x += 1) {
+    grid[0][x] = WALL;
+    grid[height - 1][x] = WALL;
+  }
+  for (let y = 0; y < height; y += 1) {
+    grid[y][0] = WALL;
+    grid[y][width - 1] = WALL;
+  }
+
+  divide(grid, 1, 1, width - 2, height - 2, random);
+
+  const start: Cell = { x: 1, y: 1 };
+  const end = findFarthestCell(start, grid);
+  carveCell(grid, start);
+  carveCell(grid, end);
+
+  return { grid, start, end };
+}
+
 function validateDimensions(width: number, height: number): void {
   if (!Number.isInteger(width) || !Number.isInteger(height)) {
     throw new Error('width and height must be integers.');
@@ -460,3 +494,46 @@ function unionSet(parent: Int32Array, a: number, b: number): void {
     parent[rootA] = rootB;
   }
 }
+
+function divide(
+  grid: number[][],
+  x: number,
+  y: number,
+  width: number,
+  height: number,
+  random: () => number
+): void {
+  if (width < 2 || height < 2) {
+    return;
+  }
+
+  const horizontal = width < height ? true : width > height ? false : random() < 0.5;
+
+  if (horizontal) {
+    const wallY = y + (Math.floor(random() * (height / 2)) * 2 + 1);
+    const passageX = x + Math.floor(random() * Math.ceil(width / 2)) * 2;
+    for (let i = x; i < x + width + 1; i += 1) {
+      if (i === passageX) {
+        continue;
+      }
+      if (grid[wallY] && grid[wallY][i] !== undefined) {
+        grid[wallY][i] = WALL;
+      }
+    }
+    divide(grid, x, y, width, wallY - y - 1, random);
+    divide(grid, x, wallY + 1, width, y + height - wallY - 1, random);
+  } else {
+    const wallX = x + (Math.floor(random() * (width / 2)) * 2 + 1);
+    const passageY = y + Math.floor(random() * Math.ceil(height / 2)) * 2;
+    for (let j = y; j < y + height + 1; j += 1) {
+      if (j === passageY) {
+        continue;
+      }
+      if (grid[j] && grid[j][wallX] !== undefined) {
+        grid[j][wallX] = WALL;
+      }
+    }
+    divide(grid, x, y, wallX - x - 1, height, random);
+    divide(grid, wallX + 1, y, x + width - wallX - 1, height, random);
+  }
+}

tests/index.test.ts

@@ -19,6 +19,7 @@ describe('package entry point', () => {
     expect(examples.procedural.generateKruskalMaze).toBe('examples/mazeKruskal.ts');
     expect(examples.procedural.generateWilsonMaze).toBe('examples/mazeWilson.ts');
     expect(examples.procedural.generateAldousBroderMaze).toBe('examples/mazeAldous.ts');
+    expect(examples.procedural.generateRecursiveDivisionMaze).toBe('examples/mazeDivision.ts');
     expect(examples.search.Trie).toBe('examples/search.ts');
     expect(examples.pathfinding.buildNavMesh).toBe('examples/navMesh.ts');
   });
@@ -68,6 +69,7 @@ describe('package entry point', () => {
       | 'generateKruskalMaze'
       | 'generateWilsonMaze'
       | 'generateAldousBroderMaze'
+      | 'generateRecursiveDivisionMaze'
     >();
   });
 });

tests/mazeDivision.test.ts

@@ -0,0 +1,24 @@
+import { describe, expect, it } from 'vitest';
+
+import { generateRecursiveDivisionMaze } from '../src/index.js';
+
+describe('generateRecursiveDivisionMaze', () => {
+  it('is deterministic for identical seeds', () => {
+    const options = { width: 21, height: 21, seed: 555 } as const;
+    const a = generateRecursiveDivisionMaze(options);
+    const b = generateRecursiveDivisionMaze(options);
+
+    expect(a.grid).toEqual(b.grid);
+    expect(a.start).toEqual(b.start);
+    expect(a.end).toEqual(b.end);
+  });
+
+  it('produces nested chambers bounded by walls', () => {
+    const { grid } = generateRecursiveDivisionMaze({ width: 17, height: 17, seed: 73 });
+    expect(grid.length).toBe(17);
+    expect(grid.every((row) => row.length === 17)).toBe(true);
+    expect(grid[0].every((cell) => cell === 1)).toBe(true);
+    expect(grid[grid.length - 1].every((cell) => cell === 1)).toBe(true);
+    expect(grid.every((row) => row[0] === 1 && row[row.length - 1] === 1)).toBe(true);
+  });
+});