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|
use super::*;
/// A fraction of remaining space.
#[derive(Default, Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
pub struct Fr(Scalar);
impl Fr {
/// Takes up zero space: `0fr`.
pub const fn zero() -> Self {
Self(Scalar(0.0))
}
/// Takes up as much space as all other items with this fraction: `1fr`.
pub const fn one() -> Self {
Self(Scalar(1.0))
}
/// Create a new fraction.
pub const fn new(ratio: f64) -> Self {
Self(Scalar(ratio))
}
/// Get the underlying number.
pub const fn get(self) -> f64 {
(self.0).0
}
/// The absolute value of this fraction.
pub fn abs(self) -> Self {
Self::new(self.get().abs())
}
/// Determine this fraction's share in the remaining space.
pub fn share(self, total: Self, remaining: Abs) -> Abs {
let ratio = self / total;
if ratio.is_finite() && remaining.is_finite() {
(ratio * remaining).max(Abs::zero())
} else {
Abs::zero()
}
}
}
impl Numeric for Fr {
fn zero() -> Self {
Self::zero()
}
fn is_finite(self) -> bool {
self.0.is_finite()
}
}
impl Debug for Fr {
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
write!(f, "{}fr", round_2(self.get()))
}
}
impl Neg for Fr {
type Output = Self;
fn neg(self) -> Self {
Self(-self.0)
}
}
impl Add for Fr {
type Output = Self;
fn add(self, other: Self) -> Self {
Self(self.0 + other.0)
}
}
sub_impl!(Fr - Fr -> Fr);
impl Mul<f64> for Fr {
type Output = Self;
fn mul(self, other: f64) -> Self {
Self(self.0 * other)
}
}
impl Mul<Fr> for f64 {
type Output = Fr;
fn mul(self, other: Fr) -> Fr {
other * self
}
}
impl Div<f64> for Fr {
type Output = Self;
fn div(self, other: f64) -> Self {
Self(self.0 / other)
}
}
impl Div for Fr {
type Output = f64;
fn div(self, other: Self) -> f64 {
self.get() / other.get()
}
}
assign_impl!(Fr += Fr);
assign_impl!(Fr -= Fr);
assign_impl!(Fr *= f64);
assign_impl!(Fr /= f64);
impl Sum for Fr {
fn sum<I: Iterator<Item = Self>>(iter: I) -> Self {
Self(iter.map(|s| s.0).sum())
}
}
|
