mapcomplete/vendor/Leaflet.AccuratePosition.js

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JavaScript
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/**
* Leaflet.AccuratePosition aims to provide an accurate device location when simply calling map.locate() doesnt.
* 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 + '.'
});
}
});
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console.log("Find accurate position script loaded");