@2d-game-grid/square/src/algorithms/distance/listCellsInDistance.js

A simple square grid made for games

import {ALL_DIRECTIONS, UniqueCellQueue} from '@2d-game-grid/core'
/**
 * @param cell The start cell
 * @param maxDistance The maximum distance (including) to a cell that should be returned
 * @param algorithm The algorithm that should be used for the distance calculation
 * @returns All cells that are in the distance (excluding the start cell)
 */
export function listCellsInDistance(cell, maxDistance, algorithm) {
  const queue = new UniqueCellQueue()
  const neighbors = cell.neighbors.list(ALL_DIRECTIONS)
  queue.ignore(cell)
  queue.addAll(neighbors)
  const cellsInDistance = []
  while (queue.hasNext()) {
    const nextCell = queue.getNext()
    if (nextCell.getDistance(cell, algorithm) <= maxDistance) {
      cellsInDistance.push(nextCell)
      queue.addAll(nextCell.neighbors.list(ALL_DIRECTIONS))
    }
  }
  return cellsInDistance
}