@rickosborne/hexgrid/offset-neighbor.mjs

Rick Osborne's collection of hexagonal grid-related code.

var __defProp = Object.defineProperty;
var __name = (target, value) => __defProp(target, "name", { value, configurable: true });
import { EVEN_Q, EVEN_R, ODD_Q, ODD_R } from "./hex-system.mjs";
const DIRECTION_DIFFERENCES = Object.freeze({
  [EVEN_Q]: [
    [[1, 1], [1, 0], [0, -1], [-1, 0], [-1, 1], [0, 1]],
    [[1, 0], [1, -1], [0, -1], [-1, -1], [-1, 0], [0, 1]]
  ],
  [EVEN_R]: [
    [[1, 0], [1, -1], [0, -1], [-1, 0], [0, 1], [1, 1]],
    [[1, 0], [0, -1], [-1, -1], [-1, 0], [-1, 1], [0, 1]]
  ],
  [ODD_Q]: [
    [[1, 0], [1, -1], [0, -1], [-1, -1], [-1, 0], [0, 1]],
    [[1, 1], [1, 0], [0, -1], [-1, 0], [-1, 1], [0, 1]]
  ],
  [ODD_R]: [
    [[1, 0], [0, -1], [-1, 1], [-1, 0], [-1, 1], [0, 1]],
    [[1, 0], [1, -1], [0, -1], [-1, 0], [0, 1], [1, 1]]
  ]
});
const offsetNeighbor = /* @__PURE__ */ __name((offset, direction) => {
  const simpleKey = offset.system === ODD_Q || offset.system === EVEN_Q ? "col" : "row";
  const bit = offset[simpleKey] & 1;
  const [colStep, rowStep] = DIRECTION_DIFFERENCES[offset.system][bit][direction];
  return {
    col: offset.col + colStep,
    row: offset.row + rowStep,
    system: offset.system
  };
}, "offsetNeighbor");
export {
  offsetNeighbor
};
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