MapComplete/vendor/Leaflet.AccuratePosition.js

/**
 * Leaflet.AccuratePosition aims to provide an accurate device location when simply calling map.locate() doesn’t.
 * https://github.com/m165437/Leaflet.AccuratePosition
 *
 * Greg Wilson's getAccurateCurrentPosition() forked to be a Leaflet plugin
 * https://github.com/gwilson/getAccurateCurrentPosition
 *
 * Copyright (C) 2013 Greg Wilson, 2014 Michael Schmidt-Voigt
 */

L.Map.include({
    _defaultAccuratePositionOptions: {
        maxWait: 10000,
        desiredAccuracy: 20
    },

    findAccuratePosition: function (options) {

        if (!navigator.geolocation) {
            this._handleAccuratePositionError({
                code: 0,
                message: 'Geolocation not supported.'
            });
            return this;
        }

        this._accuratePositionEventCount = 0;
        this._accuratePositionOptions = L.extend(this._defaultAccuratePositionOptions, options);
        this._accuratePositionOptions.enableHighAccuracy = true;
        this._accuratePositionOptions.maximumAge = 0;

        if (!this._accuratePositionOptions.timeout)
            this._accuratePositionOptions.timeout = this._accuratePositionOptions.maxWait;

        var onResponse = L.bind(this._checkAccuratePosition, this),
            onError = L.bind(this._handleAccuratePositionError, this),
            onTimeout = L.bind(this._handleAccuratePositionTimeout, this);

        this._accuratePositionWatchId = navigator.geolocation.watchPosition(
            onResponse,
            onError,
            this._accuratePositionOptions);

        this._accuratePositionTimerId = setTimeout(
            onTimeout,
            this._accuratePositionOptions.maxWait);
    },

    _handleAccuratePositionTimeout: function() {
        navigator.geolocation.clearWatch(this._accuratePositionWatchId);

        if (typeof this._lastCheckedAccuratePosition !== 'undefined') {
            this._handleAccuratePositionResponse(this._lastCheckedAccuratePosition);
        } else {
            this._handleAccuratePositionError({
                code: 3,
                message: 'Timeout expired'
            });
        }

        return this;
    },

    _cleanUpAccuratePositioning: function () {
        clearTimeout(this._accuratePositionTimerId);
        navigator.geolocation.clearWatch(this._accuratePositionWatchId);
    },

    _checkAccuratePosition: function (pos) {
        var accuracyReached = pos.coords.accuracy <= this._accuratePositionOptions.desiredAccuracy;

        this._lastCheckedAccuratePosition = pos;
        this._accuratePositionEventCount = this._accuratePositionEventCount + 1;

        if (accuracyReached && (this._accuratePositionEventCount > 1)) {
            this._cleanUpAccuratePositioning();
            this._handleAccuratePositionResponse(pos);
        } else {
            this._handleAccuratePositionProgress(pos);
        }
    },

    _prepareAccuratePositionData: function (pos) {
        var lat = pos.coords.latitude,
            lng = pos.coords.longitude,
            latlng = new L.LatLng(lat, lng),

            latAccuracy = 180 * pos.coords.accuracy / 40075017,
            lngAccuracy = latAccuracy / Math.cos(Math.PI / 180 * lat),

            bounds = L.latLngBounds(
                [lat - latAccuracy, lng - lngAccuracy],
                [lat + latAccuracy, lng + lngAccuracy]);

        var data = {
            latlng: latlng,
            bounds: bounds,
            timestamp: pos.timestamp
        };

        for (var i in pos.coords) {
            if (typeof pos.coords[i] === 'number') {
                data[i] = pos.coords[i];
            }
        }

        return data;
    },

    _handleAccuratePositionProgress: function (pos) {
        var data = this._prepareAccuratePositionData(pos);
        this.fire('accuratepositionprogress', data);
    },

    _handleAccuratePositionResponse: function (pos) {
        var data = this._prepareAccuratePositionData(pos);
        this.fire('accuratepositionfound', data);
    },

    _handleAccuratePositionError: function (error) {
        var c = error.code,
            message = error.message ||
                (c === 1 ? 'permission denied' :
                    (c === 2 ? 'position unavailable' : 'timeout'));

        this._cleanUpAccuratePositioning();

        this.fire('accuratepositionerror', {
            code: c,
            message: 'Geolocation error: ' + message + '.'
        });
    }
});
console.log("Find accurate position script loaded");