134 lines
4.4 KiB
JavaScript
134 lines
4.4 KiB
JavaScript
/**
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* Leaflet.AccuratePosition aims to provide an accurate device location when simply calling map.locate() doesn’t.
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* https://github.com/m165437/Leaflet.AccuratePosition
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*
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* Greg Wilson's getAccurateCurrentPosition() forked to be a Leaflet plugin
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* https://github.com/gwilson/getAccurateCurrentPosition
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*
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* Copyright (C) 2013 Greg Wilson, 2014 Michael Schmidt-Voigt
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*/
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L.Map.include({
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_defaultAccuratePositionOptions: {
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maxWait: 10000,
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desiredAccuracy: 20
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},
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findAccuratePosition: function (options) {
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if (!navigator.geolocation) {
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this._handleAccuratePositionError({
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code: 0,
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message: 'Geolocation not supported.'
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});
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return this;
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}
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this._accuratePositionEventCount = 0;
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this._accuratePositionOptions = L.extend(this._defaultAccuratePositionOptions, options);
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this._accuratePositionOptions.enableHighAccuracy = true;
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this._accuratePositionOptions.maximumAge = 0;
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if (!this._accuratePositionOptions.timeout)
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this._accuratePositionOptions.timeout = this._accuratePositionOptions.maxWait;
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var onResponse = L.bind(this._checkAccuratePosition, this),
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onError = L.bind(this._handleAccuratePositionError, this),
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onTimeout = L.bind(this._handleAccuratePositionTimeout, this);
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this._accuratePositionWatchId = navigator.geolocation.watchPosition(
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onResponse,
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onError,
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this._accuratePositionOptions);
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this._accuratePositionTimerId = setTimeout(
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onTimeout,
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this._accuratePositionOptions.maxWait);
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},
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_handleAccuratePositionTimeout: function() {
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navigator.geolocation.clearWatch(this._accuratePositionWatchId);
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if (typeof this._lastCheckedAccuratePosition !== 'undefined') {
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this._handleAccuratePositionResponse(this._lastCheckedAccuratePosition);
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} else {
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this._handleAccuratePositionError({
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code: 3,
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message: 'Timeout expired'
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});
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}
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return this;
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},
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_cleanUpAccuratePositioning: function () {
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clearTimeout(this._accuratePositionTimerId);
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navigator.geolocation.clearWatch(this._accuratePositionWatchId);
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},
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_checkAccuratePosition: function (pos) {
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var accuracyReached = pos.coords.accuracy <= this._accuratePositionOptions.desiredAccuracy;
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this._lastCheckedAccuratePosition = pos;
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this._accuratePositionEventCount = this._accuratePositionEventCount + 1;
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if (accuracyReached && (this._accuratePositionEventCount > 1)) {
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this._cleanUpAccuratePositioning();
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this._handleAccuratePositionResponse(pos);
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} else {
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this._handleAccuratePositionProgress(pos);
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}
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},
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_prepareAccuratePositionData: function (pos) {
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var lat = pos.coords.latitude,
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lng = pos.coords.longitude,
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latlng = new L.LatLng(lat, lng),
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latAccuracy = 180 * pos.coords.accuracy / 40075017,
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lngAccuracy = latAccuracy / Math.cos(Math.PI / 180 * lat),
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bounds = L.latLngBounds(
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[lat - latAccuracy, lng - lngAccuracy],
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[lat + latAccuracy, lng + lngAccuracy]);
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var data = {
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latlng: latlng,
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bounds: bounds,
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timestamp: pos.timestamp
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};
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for (var i in pos.coords) {
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if (typeof pos.coords[i] === 'number') {
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data[i] = pos.coords[i];
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}
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}
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return data;
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},
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_handleAccuratePositionProgress: function (pos) {
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var data = this._prepareAccuratePositionData(pos);
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this.fire('accuratepositionprogress', data);
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},
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_handleAccuratePositionResponse: function (pos) {
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var data = this._prepareAccuratePositionData(pos);
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this.fire('accuratepositionfound', data);
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},
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_handleAccuratePositionError: function (error) {
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var c = error.code,
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message = error.message ||
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(c === 1 ? 'permission denied' :
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(c === 2 ? 'position unavailable' : 'timeout'));
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this._cleanUpAccuratePositioning();
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this.fire('accuratepositionerror', {
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code: c,
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message: 'Geolocation error: ' + message + '.'
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});
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}
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});
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console.log("Find accurate position script loaded"); |