protected override Task <double> Frequency(double t, int n, int channel)
{
var isThisFeature = featureChooser.IsFeature(n, nameof(FeatureProbabilityModel.Frequency));
if (!isThisFeature)
{
return(Task.FromResult(pulseFrequency.Quiescent));
}
var section = sectionsProvider.Section(n);
var topFrequency = topFrequencyCache.GetOrAdd(section, CreateTopFrequency);
var frequency = featureProvider.FeatureValue(t, n, pulseFrequency.Quiescent, topFrequency);
return(Task.FromResult(frequency));
}
private Task <double> EvaluateCarrierFrequency(double t, int n, string carrierFrequencyString)
{
var script = scripts.GetOrAdd(carrierFrequencyString, CarrierFrequenyExpression.Parse);
var p = new CarrierFrequencyExpressionParams
{
t = t,
T = metadata.TrackLength.TotalSeconds,
v = featureProvider.FeatureValue(t, n, 0, 1)
};
script.setArgumentValue(nameof(CarrierFrequencyExpressionParams.t), p.t);
script.setArgumentValue(nameof(CarrierFrequencyExpressionParams.T), p.T);
script.setArgumentValue(nameof(CarrierFrequencyExpressionParams.v), p.v);
var result = script.calculate();
return(Task.FromResult(result));
}
private double Wetness(double t, int n)
{
if (wetness == null)
{
return(0);
}
if (sections == null)
{
return(wetness.Maximum);
}
// rise in a sin^2 fashion from MinWetness to MaxWetness
var section = sectionsProvider.Section(n);
var maxForSection = maxWetnessForSectionCache.GetOrAdd(section, s =>
{
var numSections = sectionsProvider.NumSections();
var progression = (double)s / Math.Max(1, numSections - 1); // <= 1
var max = randomizer.ProportionAlong(wetness.Variation, progression,
wetness.Minimum, wetness.Maximum);
return(max);
});
double value;
if (wetness.LinkToFeature)
{
var isThisFeature = featureChooser.IsFeature(n, nameof(FeatureProbabilityModel.Wetness));
value = isThisFeature ?
featureProvider.FeatureValue(t, n, wetness.Minimum, maxForSection)
: wetness.Minimum;
}
else
{
value = maxForSection;
}
return(value);
}