public async Task<EvaluationResultModel> RunEvaluationDuringMeasurementAsync(EvaluationDataModel evaluationData, EvaluationSettingModel evaluationSetting)
{
return await Task.Run<EvaluationResultModel>(() =>
{
return Run(evaluationData, evaluationSetting);
});
}
private EvaluationResultModel Run(EvaluationDataModel evaluationData, EvaluationSettingModel evaluationSetting)
{
EvaluationResultModel evaluationResult = new EvaluationResultModel();
AnalysisVectorLength(evaluationData, evaluationResult);
AssumingAcceleromterSteps(evaluationResult, evaluationSetting);
AssumingGyrometerSteps(evaluationResult, evaluationSetting);
DetectSteps(evaluationResult, evaluationSetting);
return evaluationResult;
}
public async Task<EvaluationResultModel> RunEvaluationAfterMeasurementAsync(EvaluationDataModel evaluationData, EvaluationSettingModel evaluationSetting)
{
return await Task.Run<EvaluationResultModel>(() =>
{
_lastKnownStep = TimeSpan.Zero;
lastAssumedAcclerometerStepTime = TimeSpan.Zero;
lastAssumedGyrometerStepTime = TimeSpan.Zero;
return Run(evaluationData, evaluationSetting);
});
}
private void AssumingAcceleromterSteps(EvaluationResultModel evaluationResultModel, EvaluationSettingModel evaluationSetting)
{
double accelerometerThreshold = evaluationSetting.AccelermeterVectorLengthThreshold;
var evaluationList = evaluationResultModel.EvaluationResultList;
if (evaluationList != null && evaluationList.Count > 2)
{
// detect Steps
for (int i = 1; i < evaluationList.Count - 1; i++)
{
double twicePreviousAccelerometerVectorLength = evaluationList.ElementAt(i).AccelerometerVectorLength;
double previousAccelerometerVectorLength = evaluationList.ElementAt(i).AccelerometerVectorLength;
double currentAccelerometerVectorLength = evaluationList.ElementAt(i).AccelerometerVectorLength;
double nextAccelerometerVectorLength = evaluationList.ElementAt(i).AccelerometerVectorLength;
double twiceNextAccelerometerVectorLength = evaluationList.ElementAt(i).AccelerometerVectorLength;
// is evaluation value not the first one && is evaluation value not the last one
if (i > 0)
{
previousAccelerometerVectorLength = evaluationList.ElementAt(i - 1).AccelerometerVectorLength;
}
if (i > 1)
{
twicePreviousAccelerometerVectorLength = evaluationList.ElementAt(i - 2).AccelerometerVectorLength;
}
if (i < evaluationList.Count - 1)
{
nextAccelerometerVectorLength = evaluationList.ElementAt(i + 1).AccelerometerVectorLength;
}
if (i < evaluationList.Count - 2)
{
twiceNextAccelerometerVectorLength = evaluationList.ElementAt(i + 2).AccelerometerVectorLength;
}
// Assume accelerometer step
if (// find peak
(currentAccelerometerVectorLength - previousAccelerometerVectorLength) * (currentAccelerometerVectorLength - nextAccelerometerVectorLength) > 0d &&
(currentAccelerometerVectorLength - twicePreviousAccelerometerVectorLength) * (currentAccelerometerVectorLength - twiceNextAccelerometerVectorLength) > 0d &&
// check threshold
currentAccelerometerVectorLength.CompareTo(accelerometerThreshold) > 0)
{
// Set assumed step
evaluationList.ElementAt(i).IsAssumedAccelerometerStep = true;
}
}
}
}
//###########################################################################
//######################## Init MeasurementTask #############################
//###########################################################################
public void Run(IBackgroundTaskInstance taskInstance)
{
Debug.WriteLine(
"####################################################\n" +
"############### Run MeasurementTask ################\n" +
"####################################################");
_taskInstance = taskInstance;
// GET TASKARGRUMENTS
_taskArguments = GetTaskArgumentsFromTriggerDetails((DeviceUseDetails)_taskInstance.TriggerDetails);
if (_taskArguments != null)
{
// init different sensors
InitAccelerometer(_taskArguments);
InitGyrometer(_taskArguments);
InitOrientationSensor(_taskArguments);
InitGeolocationSensor(_taskArguments);
taskInstance.Canceled += new BackgroundTaskCanceledEventHandler(OnCanceled);
// create new measurement data model
_measurementData = new MeasurementData(_taskArguments.Filename, _taskArguments.SampleBufferSize);
_measurementData.ListsHasSwitched += MeasurementData_ReadingsListsHasSwitched;
//set evaluation setting model
_evaluationSettingModel = new EvaluationSettingModel(_taskArguments.SampleBufferSize, _taskArguments.AccelerometerThreshold,
_taskArguments.GyrometerThreshold, _taskArguments.StepDistance, _taskArguments.PeakJoinDistance);
_deferral = _taskInstance.GetDeferral();
Debug.WriteLine(
"####################################################\n" +
"########## MeasurementTask initialisiert ###########\n" +
"####################################################");
}
else
{
Debug.WriteLine(
"####################################################\n" +
"############# MeasurementTask aborted ##############\n" +
"####################################################");
}
}
private async void StartEvaluationAppBarButton_Click(object sender, RoutedEventArgs e)
{
// Show loader
_mainPage.ShowLoader();
//prepare timer
Stopwatch stopwatch = new Stopwatch();
SettingViewModel setting = _evaluationPageViewModel.MeasurementViewModel.Setting;
//prepare evaluation settings and evaluation data
uint processedSampleCount = setting.EvaluationSettingViewModel.SampleBufferSize;
double accelerometerThreshold = setting.EvaluationSettingViewModel.AccelerometerThreshold;
double gyrometerThreshold = setting.EvaluationSettingViewModel.GyrometerThreshold;
uint stepDistance = setting.EvaluationSettingViewModel.StepDistance;
uint peakJoinDistance = setting.EvaluationSettingViewModel.PeakJoinDistance;
EvaluationSettingModel evaluationSettingModel = new EvaluationSettingModel(processedSampleCount, accelerometerThreshold, gyrometerThreshold, stepDistance, peakJoinDistance);
EvaluationDataModel evaluationDataModel = _evaluationPageViewModel.EvaluationDataModel;
//set evaluation state to started
_evaluationPageViewModel.EvaluationState = EvaluationState.Started;
((StartEvaluationCommand)_evaluationPageViewModel.StartEvaluationCommand).OnCanExecuteChanged();
//process evaluation
stopwatch.Start();
_evaluationPageViewModel.EvalautionResultModel = await _measurementEvaluationService.RunEvaluationAfterMeasurementAsync(evaluationDataModel, evaluationSettingModel);
uint totalDetectedSteps = _evaluationPageViewModel.EvalautionResultModel.DetectedSteps;
_evaluationPageViewModel.MeasurementViewModel.TotalSteps = totalDetectedSteps;
//propagate update
MeasurementModel measurement = _mainPage.GlobalMeasurementModel.GetMeasurementById(_evaluationPageViewModel.MeasurementViewModel.Id);
_mainPage.GlobalMeasurementModel.UpdateMeasurementInList(_evaluationPageViewModel.MeasurementViewModel);
// Save evaluation if necessary
if (setting.EvaluationSettingViewModel.IsRecordSamples)
{
await EvaluationService.SaveEvaluationDataToFileAsync(measurement.Filename, _evaluationPageViewModel.EvalautionResultModel);
}
//set evaluation state to stopped
stopwatch.Stop();
_evaluationPageViewModel.EvaluationState = EvaluationState.Stopped;
((StartEvaluationCommand)_evaluationPageViewModel.StartEvaluationCommand).OnCanExecuteChanged();
_mainPage.ShowNotifyMessage(String.Format("Messung wurde innerhalb von '{0:f4}' Sekunden erneut ausgewertet.", stopwatch.Elapsed.Duration().TotalSeconds), NotifyLevel.Info);
// hide loader
_mainPage.HideLoader();
}
private void DetectSteps(EvaluationResultModel evaluationResultModel, EvaluationSettingModel evaluationSetting)
{
TimeSpan stepTimeDistence = evaluationSetting.StepDistance;
TimeSpan assumedStepsPairingThreshold = evaluationSetting.PeakJoinDistance;
var evaluationList = evaluationResultModel.EvaluationResultList;
if (evaluationList != null && evaluationList.Count > 0)
{
// detect Steps
for (int i = 0; i < evaluationList.Count; i++)
{
// check timespan between to detected steps
if (evaluationList.ElementAt(i).MeasurementTime.Subtract(_lastKnownStep) > stepTimeDistence)
{
// Set assumed accelerometer step
if (evaluationList.ElementAt(i).IsAssumedAccelerometerStep)
{
lastAssumedAcclerometerStepTime = evaluationList.ElementAt(i).MeasurementTime;
}
// Set assumed gyrometer step
if (evaluationList.ElementAt(i).IsAssumedGyrometerStep)
{
lastAssumedGyrometerStepTime = evaluationList.ElementAt(i).MeasurementTime;
}
// Vergleichen der zuletzt gefundenen peaks
if (lastAssumedAcclerometerStepTime != TimeSpan.Zero &&
lastAssumedGyrometerStepTime != TimeSpan.Zero)
{
//Tritt ein, wenn der zuletzt vermutete Accelerometerschritt nach dem zuletzt vermuteten Gyrometerschritt liegt und kleiner als der Schwellwert ist.
//oder
//Tritt ein, wenn der zuletzt vermutete Acceleroemeterschritt vor dem zuletzt vermuteten Gyrometerschritt liegt und kleiner als der Schwellwert ist.
if ((lastAssumedAcclerometerStepTime.CompareTo(lastAssumedGyrometerStepTime) >= 0 &&
lastAssumedAcclerometerStepTime.Subtract(lastAssumedGyrometerStepTime) < assumedStepsPairingThreshold)
||
(lastAssumedAcclerometerStepTime.CompareTo(lastAssumedGyrometerStepTime) < 0 &&
lastAssumedGyrometerStepTime.Subtract(lastAssumedAcclerometerStepTime) < assumedStepsPairingThreshold))
{
evaluationList.ElementAt(i).IsDetectedStep = true;
_lastKnownStep = evaluationList.ElementAt(i).MeasurementTime;
lastAssumedGyrometerStepTime = TimeSpan.Zero;
lastAssumedAcclerometerStepTime = TimeSpan.Zero;
}
// Tritt ein, wenn der zuletzt vermutete Acceleroemeterschritt nach dem zuletzt vermuteten Gyrometerschritt liegt und größer als der Schwellwert ist.
else if (lastAssumedAcclerometerStepTime.CompareTo(lastAssumedGyrometerStepTime) > 0 &&
lastAssumedAcclerometerStepTime.Subtract(lastAssumedGyrometerStepTime) > assumedStepsPairingThreshold)
{
// Setzt den vermuteten Gyrometerschritt auf null zurück, weil der pairing Schwellwert überschritten wurde.
lastAssumedGyrometerStepTime = TimeSpan.Zero;
}
//Tritt ein, wenn der zuletzt vermutete Acceleroemeterschritt vor dem zuletzt vermuteten Gyrometerschritt liegt und größer als der Schwellwert ist.
else if (lastAssumedAcclerometerStepTime.CompareTo(lastAssumedGyrometerStepTime) < 0 &&
lastAssumedGyrometerStepTime.Subtract(lastAssumedAcclerometerStepTime) < assumedStepsPairingThreshold)
{
// Setzt den vermuteten Accelerometerschritt auf null zurück, weil der pairing Schwellwert überschritten wurde.
lastAssumedAcclerometerStepTime = TimeSpan.Zero;
}
}
}
}
}
}
