@2d-game-grid/square/src/algorithms/pathfinding/listReachableCells.js

A simple square grid made for games

import {ALL_DIRECTIONS, UniqueCellQueue} from '@2d-game-grid/core'
/**
 * @param cell The start cell
 * @param maxPathSteps The maximum amount of steps (including) to a cell that should be returned (start and end cell included)
 * @param options The options to customize the pathfinding
 * @returns All cells that are reachable (excluding the start cell)
 */
export function listReachableCells(cell, maxPathSteps, options) {
  const queue = new UniqueCellQueue()
  const neighbors = cell.neighbors.list(ALL_DIRECTIONS)
  queue.ignore(cell)
  queue.addAll(neighbors)
  const reachableCells = []
  while (queue.hasNext()) {
    const nextCell = queue.getNext()
    const steps = cell.getPath(nextCell, options).length
    if (steps >= 1 && steps <= maxPathSteps) {
      reachableCells.push(nextCell)
      queue.addAll(nextCell.neighbors.list(ALL_DIRECTIONS))
    }
  }
  return reachableCells
}