cordova-plugin-googlemaps/www/LatLngBounds.js

Google Maps native SDK for Android and iOS, and Google Maps JavaScript API v3 for browser.

var LatLng = require('./LatLng');

/*****************************************************************************
 * LatLngBounds Class
 *****************************************************************************/
var LatLngBounds = function () {
  Object.defineProperty(this, 'type', {
    value: 'LatLngBounds',
    writable: false
  });

  var args = [];
  if (arguments.length === 1 &&
    typeof arguments[0] === 'object' &&
    'push' in arguments[0]) {
    args = arguments[0];
  } else {
    args = Array.prototype.slice.call(arguments, 0);
  }

  for (var i = 0; i < args.length; i++) {
    if (args[i] && 'lat' in args[i] && 'lng' in args[i]) {
      this.extend(args[i]);
    }
  }
};

LatLngBounds.prototype.northeast = null;
LatLngBounds.prototype.southwest = null;

LatLngBounds.prototype.toString = function () {
  return '{"southwest":' + this.southwest.toString() + ', "northeast":' + this.northeast.toString() + '}';
};
LatLngBounds.prototype.toUrlValue = function (precision) {
  precision = precision || 6;
  return '[' + this.southwest.toUrlValue(precision) + ',' + this.northeast.toUrlValue(precision) + ']';
};

LatLngBounds.prototype.extend = function (latLng) {
  if (latLng && 'lat' in latLng && 'lng' in latLng) {
    if (!this.southwest && !this.northeast) {
      this.southwest = latLng;
      this.northeast = latLng;
    } else {
      var south = Math.min(latLng.lat, this.southwest.lat);
      var north = Math.max(latLng.lat, this.northeast.lat);

      var west = this.southwest.lng,
        east = this.northeast.lng;

      if (west > 0 && east < 0) {
        if (latLng.lng > 0) {
          west = Math.min(latLng.lng, west);
        } else {
          east = Math.max(latLng.lng, east);
        }
      } else {

        west = Math.min(latLng.lng, this.southwest.lng);
        east = Math.max(latLng.lng, this.northeast.lng);
      }

      delete this.southwest;
      delete this.northeast;
      this.southwest = new LatLng(south, west);
      this.northeast = new LatLng(north, east);
    }
  }
};

LatLngBounds.prototype.getCenter = function () {
  var centerLat = (this.southwest.lat + this.northeast.lat) / 2;

  var swLng = this.southwest.lng;
  var neLng = this.northeast.lng;
  var sumLng = swLng + neLng;
  var centerLng = sumLng / 2;

  if ((swLng > 0 && neLng < 0 && sumLng < 180)) {
    centerLng += sumLng > 0 ? -180 : 180;
  }
  return new LatLng(centerLat, centerLng);
};
LatLngBounds.prototype.contains = function (latLng) {
  if (!latLng || !('lat' in latLng) || !('lng' in latLng)) {
    return false;
  }
  var y = latLng.lat,
    x = latLng.lng;

  var y90 = y + 90;
  var south = this.southwest.lat,
    north = this.northeast.lat,
    west = this.southwest.lng,
    east = this.northeast.lng;
  var south90 = south + 90,
    north90 = north + 90;

  var containX = false,
    containY = false;

  if (west <= 0 && east <= 0 && west <= east) {
    if (x > 0) {
      containX = false;
    } else {
      containX = (west <= x && x <= east);
    }
  } else if (east <= 0 && west > 0 && east <= west) {
    if (x > 0) {
      containX = (x >= west && x <= 180);
    } else {
      containX = (-180 <= x && x <= west);
    }
  } else if (west <= 0 && east > 0 && west <= east) {
    if (x < 0) {
      containX = (west <= x && x <= 0);
    } else {
      containX = (x >= 0 && x <= east);
    }
  } else {
    containX = (west <= x && x <= east);
  }

  containY = (south90 <= y90 && y90 <= north90) || //#a
    (south >= 0 && north <= 0 && ((south <= y && y <= 90) || (y >= -90 && y <= north))); // #d

  return containX && containY;
};

module.exports = LatLngBounds;