HEX_LINE_DIRECTIONSconstant

The three line orientations on the hexagon lattice — see rules/hexagon.ts for the embedding. Each is checked both ways, covering the six neighbours a hexagon cell has. Three of the square board's own four: horizontal, vertical and the slanted diagonal that follows the lattice's shear. The fourth, {row: 1, col: 1}, is a diagonal of the SQUARE embedding only — two cells that far apart along it are not lattice neighbours, and no unbroken run of hexagon cells ever lies along it — so it is left out here on purpose, never scanned as a line.

import { HEX_LINE_DIRECTIONS } from "@johnmorrisdotca/narabe";

const HEX_LINE_DIRECTIONS: readonly Point[] = [
    { row: 0, col: 1 },
    { row: 1, col: 0 },
    { row: 1, col: -1 },
]

import { HEX_LINE_DIRECTIONS } from "@johnmorrisdotca/narabe";
console.log(HEX_LINE_DIRECTIONS);

[ { row: 0, col: 1 }, { row: 1, col: 0 }, { row: 1, col: -1 } ]