maplibre-gl-indoor/src/bbox.ts

A MapLibre plugin to visualize multi-level buildings

import type { BBox, Position } from "geojson";

export function bboxCenter(bbox: BBox): Position {
  const [west, south, east, north] = bbox;
  return [(west + east) / 2, (south + north) / 2];
}

export function bboxContains(bbox: BBox, point: Position): boolean {
  const [west, south, east, north] = bbox;
  const [lng, lat] = point;

  const containsLatitude = south <= lat && lat <= north;
  let containsLongitude = west <= lng && lng <= east;
  if (west > east) {
    containsLongitude = west >= lng && lng >= east;
  }

  return containsLatitude && containsLongitude;
}

export function overlap(bounds1: BBox, bounds2: BBox) {
  const oneRectangleIsOnLeftSideOfOther =
    bounds1[0] > bounds2[2] || bounds2[0] > bounds1[2];
  if (oneRectangleIsOnLeftSideOfOther) {
    return false;
  }
  const rectangleIsAboveOther =
    bounds1[3] < bounds2[1] || bounds2[3] < bounds1[1];
  return !rectangleIsAboveOther;
}