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use super::measurement::*;
const NEWTON_METRE_POUND_FOOT_FACTOR: f64 = 0.73756326522588;
#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
#[derive(Copy, Clone, Debug)]
pub struct Torque {
newton_metres: f64,
}
impl Torque {
pub fn from_newton_metres(newton_metres: f64) -> Self {
Torque { newton_metres }
}
pub fn from_newton_meters(newton_meters: f64) -> Self {
Torque::from_newton_metres(newton_meters)
}
pub fn from_pound_foot(pound_foot: f64) -> Self {
Torque::from_newton_metres(pound_foot / NEWTON_METRE_POUND_FOOT_FACTOR)
}
pub fn as_newton_metres(&self) -> f64 {
self.newton_metres
}
pub fn as_newton_meters(&self) -> f64 {
self.newton_metres
}
pub fn as_pound_foot(&self) -> f64 {
self.newton_metres * NEWTON_METRE_POUND_FOOT_FACTOR
}
}
impl Measurement for Torque {
fn as_base_units(&self) -> f64 {
self.newton_metres
}
fn from_base_units(units: f64) -> Self {
Self::from_newton_metres(units)
}
fn get_base_units_name(&self) -> &'static str {
"Nm"
}
}
implement_measurement! { Torque }
#[cfg(test)]
mod test {
use super::*;
use test_utils::assert_almost_eq;
#[test]
fn lbf_ft() {
let i1 = Torque::from_pound_foot(250.0);
let r1 = i1.as_newton_metres();
let i2 = Torque::from_newton_metres(300.0);
let r2 = i2.as_pound_foot();
assert_almost_eq(r1, 338.954);
assert_almost_eq(r2, 221.269);
}
}