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pub struct ScrollTracker {
tick: f64,
last: f64,
acc: f64,
}
impl ScrollTracker {
#[allow(clippy::new_without_default)]
pub fn new(tick: i8) -> Self {
Self {
tick: f64::from(tick),
last: 0.,
acc: 0.,
}
}
pub fn accumulate(&mut self, amount: f64) -> i8 {
let changed_direction = (self.last > 0. && amount < 0.) || (self.last < 0. && amount > 0.);
if changed_direction {
self.acc = 0.
}
self.last = amount;
self.acc += amount;
let mut ticks = 0;
if self.acc.abs() >= self.tick {
let clamped = self.acc.clamp(-127. * self.tick, 127. * self.tick);
ticks = (clamped as i16 / self.tick as i16) as i8;
self.acc %= self.tick;
}
ticks
}
pub fn reset(&mut self) {
self.last = 0.;
self.acc = 0.;
}
}
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