author | Ryan Willoughby <ryan.willoughby@nitobi.com> |
Tue, 06 Jul 2010 11:31:19 -0700 | |
changeset 0 | 54063d8b0412 |
permissions | -rwxr-xr-x |
0
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initial commit of PhoneGap WRT framework, licensing and test code
Ryan Willoughby <ryan.willoughby@nitobi.com>
parents:
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/** |
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* This class provides access to device GPS data. |
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* @constructor |
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*/ |
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function Geolocation() { |
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/** |
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* The last known GPS position. |
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*/ |
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this.lastPosition = null; |
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this.lastError = null; |
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this.callbacks = { |
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onLocationChanged: [], |
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initial commit of PhoneGap WRT framework, licensing and test code
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onError: [] |
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initial commit of PhoneGap WRT framework, licensing and test code
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}; |
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initial commit of PhoneGap WRT framework, licensing and test code
Ryan Willoughby <ryan.willoughby@nitobi.com>
parents:
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}; |
54063d8b0412
initial commit of PhoneGap WRT framework, licensing and test code
Ryan Willoughby <ryan.willoughby@nitobi.com>
parents:
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|
54063d8b0412
initial commit of PhoneGap WRT framework, licensing and test code
Ryan Willoughby <ryan.willoughby@nitobi.com>
parents:
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/** |
54063d8b0412
initial commit of PhoneGap WRT framework, licensing and test code
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parents:
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* Asynchronously aquires the current position. |
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parents:
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* @param {Function} successCallback The function to call when the position |
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initial commit of PhoneGap WRT framework, licensing and test code
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* data is available |
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* @param {Function} errorCallback The function to call when there is an error |
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initial commit of PhoneGap WRT framework, licensing and test code
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* getting the position data. |
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initial commit of PhoneGap WRT framework, licensing and test code
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* @param {PositionOptions} options The options for getting the position data |
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initial commit of PhoneGap WRT framework, licensing and test code
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* such as timeout. |
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initial commit of PhoneGap WRT framework, licensing and test code
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*/ |
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Geolocation.prototype.getCurrentPosition = function(successCallback, errorCallback, options) { |
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var referenceTime = 0; |
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if (this.lastPosition) |
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referenceTime = this.lastPosition.timestamp; |
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else |
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this.start(options); |
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|
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var timeout = 20000; |
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var interval = 500; |
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if (typeof(options) == 'object' && options.interval) |
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initial commit of PhoneGap WRT framework, licensing and test code
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interval = options.interval; |
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initial commit of PhoneGap WRT framework, licensing and test code
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|
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initial commit of PhoneGap WRT framework, licensing and test code
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if (typeof(successCallback) != 'function') |
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successCallback = function() {}; |
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initial commit of PhoneGap WRT framework, licensing and test code
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if (typeof(errorCallback) != 'function') |
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errorCallback = function() {}; |
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|
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initial commit of PhoneGap WRT framework, licensing and test code
Ryan Willoughby <ryan.willoughby@nitobi.com>
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var dis = this; |
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var delay = 0; |
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var timer = setInterval(function() { |
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delay += interval; |
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//if we have a new position, call success and cancel the timer |
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if (dis.lastPosition && dis.lastPosition.timestamp > referenceTime) { |
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successCallback(dis.lastPosition); |
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clearInterval(timer); |
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initial commit of PhoneGap WRT framework, licensing and test code
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} else if (delay >= timeout) { //else if timeout has occured then call error and cancel the timer |
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initial commit of PhoneGap WRT framework, licensing and test code
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errorCallback(); |
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initial commit of PhoneGap WRT framework, licensing and test code
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clearInterval(timer); |
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} |
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//else the interval gets called again |
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}, interval); |
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}; |
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|
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/** |
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* Asynchronously aquires the position repeatedly at a given interval. |
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* @param {Function} successCallback The function to call each time the position |
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parents:
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* data is available |
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* @param {Function} errorCallback The function to call when there is an error |
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initial commit of PhoneGap WRT framework, licensing and test code
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* getting the position data. |
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parents:
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* @param {PositionOptions} options The options for getting the position data |
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* such as timeout and the frequency of the watch. |
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*/ |
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Geolocation.prototype.watchPosition = function(successCallback, errorCallback, options) { |
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// Invoke the appropriate callback with a new Position object every time the implementation |
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// determines that the position of the hosting device has changed. |
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this.getCurrentPosition(successCallback, errorCallback, options); |
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var frequency = 10000; |
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if (typeof options == 'object' && options.frequency) |
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frequency = options.frequency; |
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var that = this; |
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return setInterval(function() { |
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that.getCurrentPosition(successCallback, errorCallback, options); |
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}, frequency); |
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}; |
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|
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|
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/** |
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* Clears the specified position watch. |
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* @param {String} watchId The ID of the watch returned from #watchPosition. |
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*/ |
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parents:
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Geolocation.prototype.clearWatch = function(watchId) { |
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clearInterval(watchId); |
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}; |
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|
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Geolocation.prototype.start = function(options) { |
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var so = device.getServiceObject("Service.Location", "ILocation"); |
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|
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//construct the criteria for our location request |
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var updateOptions = new Object(); |
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// Specify that location information need not be guaranteed. This helps in |
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// that the widget doesn't need to wait for that information possibly indefinitely. |
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updateOptions.PartialUpdates = true; |
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|
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99 |
//default 15 seconds |
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if (typeof(options) == 'object' && options.timeout) |
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//options.timeout in in ms, updateOptions.UpdateTimeout in microsecs |
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updateOptions.UpdateTimeOut = options.timeout * 1000; |
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103 |
|
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//default 1 second |
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if (typeof(options) == 'object' && options.interval) |
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//options.timeout in in ms, updateOptions.UpdateTimeout in microsecs |
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updateOptions.UpdateInterval = options.interval * 1000; |
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108 |
|
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// Initialize the criteria for the GetLocation call |
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var trackCriteria = new Object(); |
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// could use "BasicLocationInformation" or "GenericLocationInfo" |
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112 |
trackCriteria.LocationInformationClass = "GenericLocationInfo"; |
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trackCriteria.Updateoptions = updateOptions; |
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var dis = this; |
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so.ILocation.Trace(trackCriteria, function(transId, eventCode, result) { |
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var retVal = result.ReturnValue; |
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if (result.ErrorCode != 0 || isNaN(retVal.Latitude)) |
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return; |
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// heading options: retVal.TrueCourse, retVal.MagneticHeading, retVal.Heading, retVal.MagneticCourse |
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// but retVal.Heading was the only field being returned with data on the test device (Nokia 5800) |
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// WRT does not provide accuracy |
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var newCoords = new Coordinates(retVal.Latitude, retVal.Longitude, retVal.Altitude, null, retVal.Heading, retVal.HorizontalSpeed); |
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var positionObj = { coords: newCoords, timestamp: (new Date()).getTime() }; |
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dis.lastPosition = positionObj; |
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}); |
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}; |
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if (typeof navigator.geolocation == "undefined") navigator.geolocation = new Geolocation(); |
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