/// <summary>
/// Applies the current trigger and aligns all sample sequences accordingly.
/// </summary>
/// <param name="externalSampleSequenceProviders">
/// The functions that provide the raw signal sample sequences, one function per channel.
/// </param>
/// <returns>
/// Functions that provide the signal sample sequences after the trigger has been applied,
/// one function per channel.
/// </returns>
protected IEnumerable <Func <SampleSequence> > ApplyTriggerAndAlignSampleSequences(
IEnumerable <Func <SampleSequence> > externalSampleSequenceProviders)
{
double triggerX = 0;
return(externalSampleSequenceProviders.Select((provider, index) =>
{
return new Func <SampleSequence>(() =>
{
var sampleSequence = provider();
if (index == TriggerChannelIndex)
// We are currently providing the sample sequence of the trigger channel,
// determine the trigger reference time.
{
Trigger.Arm();
var taken = sampleSequence.Values.TakeWhile(element => !Trigger.Check(element));
var numberOfValuesTakenBeforeTrigger = taken.Count();
// TODO: Interpolate considering values before and after trigger.
triggerX =
Trigger.State == TriggerState.Triggered ?
numberOfValuesTakenBeforeTrigger * sampleSequence.SampleInterval
: 0;
}
// Set the channel's reference point according to where triggering has happened.
sampleSequence.ReferenceX = triggerX;
return sampleSequence;
});
}));
}