116 lines
2.3 KiB
Rust
116 lines
2.3 KiB
Rust
//! Length quantities.
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//!
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//! The base unit is the meter. [`Meters`] and [`Kilometers`] both measure
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//! [`Length`](crate::dimension::Length) and convert into each other through
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//! [`Quantity::to_unit`](apsis_core::Quantity::to_unit).
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use crate::dimension::Length;
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use crate::macros::impl_quantity_ops;
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use apsis_core::{Quantity, Unit};
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use core::fmt;
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/// A length in meters.
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#[derive(Debug, Clone, Copy, PartialEq, PartialOrd, Default)]
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pub struct Meters(f64);
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/// A length in kilometers.
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#[derive(Debug, Clone, Copy, PartialEq, PartialOrd, Default)]
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pub struct Kilometers(f64);
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impl Meters {
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/// Creates a length from a value in meters.
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pub const fn new(value: f64) -> Self {
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Self(value)
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}
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/// Returns this length in meters.
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pub const fn value(self) -> f64 {
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self.0
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}
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/// Converts this length to kilometers.
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pub fn to_kilometers(self) -> Kilometers {
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Kilometers(self.0 / 1_000.0)
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}
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}
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impl Kilometers {
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/// Creates a length from a value in kilometers.
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pub const fn new(value: f64) -> Self {
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Self(value)
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}
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/// Returns this length in kilometers.
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pub const fn value(self) -> f64 {
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self.0
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}
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/// Converts this length to meters.
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pub fn to_meters(self) -> Meters {
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Meters(self.0 * 1_000.0)
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}
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}
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impl Unit for Meters {
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type Dimension = Length;
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fn factor_to_base() -> f64 {
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1.0
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}
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fn symbol() -> &'static str {
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"m"
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}
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}
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impl Unit for Kilometers {
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type Dimension = Length;
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fn factor_to_base() -> f64 {
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1_000.0
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}
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fn symbol() -> &'static str {
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"km"
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}
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}
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impl Quantity for Meters {
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type U = Meters;
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fn value(self) -> f64 {
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self.0
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}
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fn from_value(value: f64) -> Self {
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Self(value)
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}
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}
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impl Quantity for Kilometers {
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type U = Kilometers;
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fn value(self) -> f64 {
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self.0
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}
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fn from_value(value: f64) -> Self {
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Self(value)
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}
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}
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impl fmt::Display for Meters {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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write!(f, "{} m", self.0)
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}
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}
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impl fmt::Display for Kilometers {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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write!(f, "{} km", self.0)
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}
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}
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impl_quantity_ops!(Meters);
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impl_quantity_ops!(Kilometers);
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