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|
use super::{ Amplitude, Hz, Line, Millisecond, Osc, Sample, SamplesPerSecond };
pub struct Partial {
amplitude: Amplitude,
relative_duration: f32,
relative_frequency: f32,
detune: Hz,
osc: Osc,
attack: Line,
decay: Line,
}
impl Partial {
pub fn new(
amplitude: Amplitude,
relative_duration: f32,
relative_frequency: f32,
detune: Hz,
sample_rate: SamplesPerSecond,
base_duration: Millisecond,
base_frequency: Hz,
) -> Self {
let freq = base_frequency * relative_frequency + detune;
let decay_duration = base_duration as f32 * relative_duration;
Self {
amplitude, relative_duration, relative_frequency, detune,
osc: Osc::new(freq, sample_rate),
attack: Line::new(0.0, amplitude, 5, sample_rate),
decay: Line::new(amplitude, 0.0, decay_duration as u32, sample_rate),
}
}
}
impl Iterator for Partial {
type Item = Sample;
fn next(&mut self) -> Option<Self::Item> {
let amplitude = match self.attack.next() {
Some(amp) => Some(amp),
None => self.decay.next()
};
match amplitude {
Some(amp) => Some(self.osc.next().unwrap() * amp),
None => None
}
}
}
|
