rexboard-visibility-and-routes

name	rexboard-visibility-and-routes
description	Use this skill when working with RexBoard fieldOfView, FieldOfView, board visibility, line of sight, LOS, blockers, cone mode, visible tiles, RexBoard Monopoly, board route traversal, route cost, or directional board paths. Triggers on: RexBoard fieldOfView, FieldOfView, board visibility, line of sight, LOS, RexBoard Monopoly, board route.

RexBoard Visibility And Routes

Use this skill for board algorithms that answer visibility and route traversal questions.

Use This First

Choose the helper:

Need	Use
Visible tiles around a chess piece	FieldOfView.findFOV(...)
Can a piece see a target	FieldOfView.isInLOS(...) or LOS(...)
Filter visible targets	FieldOfView.LOS(targets, ...)
Directional route traversal	Monopoly.getPath(...)
Route stop/blocker rules	Monopoly.costCallback

Required Setup

This skill assumes pieces are already registered as RexBoard chess. If not, use rexboard-board-and-chess.

References

Read these only when needed:

• references/fieldofview-config.md: FOV config, callbacks, costs, blockers, LOS, and cone options.
• references/monopoly-config.md: route traversal config, callbacks, and sentinels.
• references/visibility-route-recipes.md: reduced recipes for visible tiles, LOS, target filtering, and route paths.

Core Rules

• Use FieldOfView for visibility; use PathFinder for shortest/reachable paths.
• Use Monopoly for directional route traversal, not general A* pathfinding.
• Keep occupied tests, blocker tests, pre-test callbacks, and cost callbacks separate.
• Use instance sentinels (fov.BLOCKER, fov.INFINITY, monopoly.STOP, monopoly.BLOCKER) in callbacks.
• Choose coneMode: 'direction' for grid-direction cones and coneMode: 'angle' for angular cones.

Source File Map

• plugins/board/fieldofview/FieldOfView.d.ts: visibility config, callbacks, LOS, and FOV methods.
• plugins/board/monopoly/Monopoly.d.ts: route config, cost callback, and path methods.
• plugins/board/fieldofview/Factory.js: fieldOfView factory signature.
• plugins/board/monopoly/Factory.js: monopoly factory signature.

Related Skills

• rexboard-board-and-chess: board chess and blockers.
• rexboard-grids-and-coordinates: directions, cones, distances, and line tile queries.
• rexboard-movement-and-pathfinding: PathFinder and MoveTo workflows.

Gotchas

• FieldOfView.BLOCKER is null; FieldOfView.INFINITY is undefined.
• Monopoly.STOP is -1; Monopoly.BLOCKER is null.
• LOS has several overloads; keep argument order explicit in generated code.