overpass-frontend/src/qlFunctions/bbox.js

A JavaScript (NodeJS/Browser) library to easily access data from OpenStreetMap via Overpass API or from an OSM File. The objects can directly be used with LeafletJS or exported to GeoJSON. Data will be cached in the browser memory.

const BoundingBox = require('boundingbox')
const turf = require('../turf')
const OverpassFrontend = require('../defines')
const qlFunction = require('./qlFunction')

module.exports = class bbox extends qlFunction {
  constructor (str) {
    super()
    this.fun = 'bbox'

    let s = str.split(/,/g)

    if (s.length !== 4) {
      throw new Error('bbox function expects "latitude,longitude,latitude,longitude"')
    }

    s = s.map(v => parseFloat(v))

    this.value = new BoundingBox({
      minlat: s[0],
      minlon: s[1],
      maxlat: s[2],
      maxlon: s[3]
    })
  }

  test (ob) {
    return ob.intersects(this.value)
  }

  toString () {
    return '(' + this.value.toLatLonString() + ')'
  }

  compileLokiJS () {
    return { needMatch: true }
  }

  cacheDescriptors (descriptors) {
    const bounds = this.value.toGeoJSON()

    descriptors.forEach(d => {
      const newBounds = d.bounds ? turf.intersect(d.bounds, bounds) : bounds
      if (newBounds === null) {
        d.invalid = true
      } else {
        d.bounds = newBounds.geometry
        d.properties |= OverpassFrontend.GEOM
      }
    })
  }

  isSupersetOf (other) {
    if (other instanceof bbox) {
      return other.value.within(this.value)
    }

    if (other.bounds) {
      return !!turf.difference(this.bounds(), other.bounds())
    }
  }

  bounds () {
    return this.value.toGeoJSON()
  }
}