protected override IEnumerable <Stage> Following()
{
if (_completed)
{
return(null);
}
var target = _randomBoolSequence.Next();
var cue = target ? NonTargetChars.ElementAt(_r.Next(NonTargetChars.Length)).ToString() : "X";
if (_testConfig.Still)
{
var stage = new Stage {
Cue = cue, Duration = _remaining
};
_completed = true;
return(new[] { stage });
}
var stages = new Stage[2];
var marker = target ? CptExperiment.TargetDisplayMarker : CptExperiment.NonTargetDisplayMarker;
stages[0] = new CptStage {
Cue = cue, IsTarget = target, Duration = _testConfig.LetterDuration, Marker = marker
};
stages[1] = new Stage {
Cue = "", Duration = _testConfig.InterStimulusInterval, Marker = CptExperiment.IntervalMarker
};
if (_remaining < _testConfig.LetterDuration + _testConfig.InterStimulusInterval)
{
_completed = true;
}
else
{
_remaining -= _testConfig.LetterDuration + _testConfig.InterStimulusInterval;
if (_remaining < _testConfig.LetterDuration)
{
_completed = true;
}
}
return(stages);
}
public ActivedStage(ulong timestamp, CptStage stage, CptExperiment.CptTrial trial)
{
Timestamp = timestamp;
Stage = stage;
Trial = trial;
}
