Struct TempoCurve 

pub struct TempoCurve { /* private fields */ }

A tempo curve: a programmed change in tempo over a duration.

Like a musician’s accelerando or ritardando, a TempoCurve smoothly transitions from one tempo to another over a given time span.

Implementations

impl TempoCurve

pub fn new(start_bpm: f64, end_bpm: f64, duration_beats: u32) -> Self

Create a new tempo curve.

pub fn rubato(base_bpm: f64, fluctuation: f64, duration_beats: u32) -> Self

Create a rubato-shaped curve (free fluctuation).

pub fn with_label(self, label: impl Into<String>) -> Self

Label the curve.

pub fn bpm_at_beat(&self, beat: f64) -> f64

Get the BPM at a given beat position (linear interpolation).

pub fn bpm_at_position(&self, pos: f64) -> f64

Get the BPM at a given normalized position (0.0 = start, 1.0 = end). Uses ease-in-ease-out for smoother transitions.

pub fn shape(&self) -> CurveShape

The shape of the curve.

pub fn start_bpm(&self) -> f64

Start BPM.

pub fn end_bpm(&self) -> f64

End BPM.

pub fn duration_beats(&self) -> u32

Duration in beats.

pub fn label(&self) -> Option<&str>

Label.

pub fn delta(&self) -> f64

Total change in BPM.

pub fn is_accelerando(&self) -> bool

Is the curve speeding up?

pub fn is_ritardando(&self) -> bool

Is the curve slowing down?

Trait Implementations

impl Clone for TempoCurve

fn clone(&self) -> TempoCurve

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for TempoCurve

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.