Add SEO files and implement grid-based enemy movement system#144
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Add SEO files and implement grid-based enemy movement system#144
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Standardize enemy movement to a discrete tile grid with orthogonal-only movement (Up/Down/Left/Right) at 1 tile per turn. This makes enemy pathing predictable and allows players to forecast threats by tile distance. - Add gridX/gridZ coordinates to Enemy type and GridPos helper type - Add grid constants (GRID_TILE_SIZE, GRID_HALF, GRID_SPAWN_RING, GRID_TOWER_RADIUS) - Rewrite spawnEnemies to place on Manhattan-distance perimeter cells - Rewrite updateEnemies for orthogonal greedy pathfinding with collision avoidance - Update killEnemies and fireBullet to use Manhattan distance https://claude.ai/code/session_01B1pGw7pTLFLwYhHVKFJig2
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Summary
This PR adds SEO infrastructure (robots.txt and sitemap.xml) and refactors the tower defense enemy movement system from continuous physics-based movement to a discrete grid-based system with orthogonal-only movement.
Key Changes
SEO Infrastructure
public/robots.txtwith crawler directives (disallowing/api/,/admin/,/images/,/net*) and sitemap referencepublic/sitemap.xmlwith four main routes (blog, shader-demo, sns-widgets, sunphase) marked for daily crawlingTower Defense Grid System
New grid constants in
constants.ts:GRID_TILE_SIZE: World units per grid tile (1 unit)GRID_HALF: Grid extends ±18 tiles from centerGRID_SPAWN_RING: Enemies spawn at Manhattan distance 18 from towerGRID_TOWER_RADIUS: Enemy reaches tower at Manhattan distance ≤ 1Enemy type updates in
types.ts:gridXandgridZproperties for discrete grid coordinatesx,y,zare now derived from grid coords for renderingMovement system refactor in
useGameState.ts:spawnEnemies(): Spawns enemies on the perimeter at Manhattan distance = 18, with collision avoidanceupdateEnemies(): Implements pathfinding using Manhattan distance; enemies pick the best cardinal direction that reduces distance to tower, avoiding occupied cellskillEnemies()andfireBullet(): Updated to use Manhattan distance for targeting priorityImplementation Details
GRID_TILE_SIZE) for 3D renderinghttps://claude.ai/code/session_01B1pGw7pTLFLwYhHVKFJig2