google-map-react/modules/utils/lib_geo/lat_lng_bounds.js

isomorphic google map react component, allows render react components on the google map

'use strict';

module.exports = LatLngBounds;

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

function LatLngBounds(sw, ne) {
    if (!sw) return;

    var latlngs = ne ? [sw, ne] : sw;

    for (var i = 0, len = latlngs.length; i < len; i++) {
        this.extend(latlngs[i]);
    }
}

LatLngBounds.prototype = {

    // extend the bounds to contain the given point or bounds
    extend: function extend(obj) {
        var sw = this._sw,
            ne = this._ne,
            sw2,
            ne2;

        if (obj instanceof LatLng) {
            sw2 = obj;
            ne2 = obj;
        } else if (obj instanceof LatLngBounds) {
            sw2 = obj._sw;
            ne2 = obj._ne;

            if (!sw2 || !ne2) return this;
        } else {
            return obj ? this.extend(LatLng.convert(obj) || LatLngBounds.convert(obj)) : this;
        }

        if (!sw && !ne) {
            this._sw = new LatLng(sw2.lat, sw2.lng);
            this._ne = new LatLng(ne2.lat, ne2.lng);
        } else {
            sw.lat = Math.min(sw2.lat, sw.lat);
            sw.lng = Math.min(sw2.lng, sw.lng);
            ne.lat = Math.max(ne2.lat, ne.lat);
            ne.lng = Math.max(ne2.lng, ne.lng);
        }

        return this;
    },

    getCenter: function getCenter() {
        return new LatLng((this._sw.lat + this._ne.lat) / 2, (this._sw.lng + this._ne.lng) / 2);
    },

    getSouthWest: function getSouthWest() {
        return this._sw;
    },
    getNorthEast: function getNorthEast() {
        return this._ne;
    },
    getNorthWest: function getNorthWest() {
        return new LatLng(this.getNorth(), this.getWest());
    },
    getSouthEast: function getSouthEast() {
        return new LatLng(this.getSouth(), this.getEast());
    },

    getWest: function getWest() {
        return this._sw.lng;
    },
    getSouth: function getSouth() {
        return this._sw.lat;
    },
    getEast: function getEast() {
        return this._ne.lng;
    },
    getNorth: function getNorth() {
        return this._ne.lat;
    }
};

// constructs LatLngBounds from an array if necessary
LatLngBounds.convert = function (a) {
    if (!a || a instanceof LatLngBounds) return a;
    return new LatLngBounds(a);
};