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Added temperature units

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This commit is contained in:
Kasper 2020-01-09 15:10:04 +01:00
parent f1095ca8de
commit d428546ecf
1 changed files with 28 additions and 2 deletions
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26
src/units.rs
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@ -8,6 +8,7 @@ pub enum UnitType {
Area,
Volume,
Mass,
Temperature,
}
use UnitType::*;
@ -104,6 +105,9 @@ create_units!(
Pound: (Mass, d128!(453.59237)),
ShortTon: (Mass, d128!(907184.74)),
LongTon: (Mass, d128!(1016046.9088)),
Kelvin: (Temperature, d128!(0)),
Celcius: (Temperature, d128!(0)),
Fahrenheit: (Temperature, d128!(0)),
);
impl Unit {
@ -120,8 +124,23 @@ fn get_convertion_factor(unit: Unit, to_unit: Unit) -> d128 {
}
pub fn convert(value: d128, unit: Unit, to_unit: Unit) -> Result<d128, String> {
if unit.category() == UnitType::Temperature {
match (unit, to_unit) {
(Kelvin, Kelvin) => Ok(value),
(Kelvin, Celcius) => Ok(value-d128!(273.15)),
(Kelvin, Fahrenheit) => Ok(value*d128!(1.8)-d128!(459.67)),
(Celcius, Celcius) => Ok(value),
(Celcius, Kelvin) => Ok(value+d128!(273.15)),
(Celcius, Fahrenheit) => Ok(value*d128!(1.8)+d128!(32)),
(Fahrenheit, Fahrenheit) => Ok(value),
(Fahrenheit, Kelvin) => Ok((value+d128!(459.67))*d128!(5)/d128!(9)),
(Fahrenheit, Celcius) => Ok((value-d128!(32))/d128!(1.8)),
_ => Err(format!("Error converting temperature {:?} to {:?}", unit, to_unit)),
}
} else {
let convertion_factor = get_convertion_factor(unit, to_unit);
Ok(value * convertion_factor)
}
}
#[cfg(test)]
@ -220,5 +239,12 @@ mod tests {
assert_eq!(convert_test(16.0, Ounce, Pound), 1.0);
assert_eq!(convert_test(2000.0, Pound, ShortTon), 1.0);
assert_eq!(convert_test(2240.0, Pound, LongTon), 1.0);
assert_eq!(convert_test(274.15, Kelvin, Celcius), 1.0);
assert_eq!(convert_test(300.0, Kelvin, Fahrenheit), 80.33);
assert_eq!(convert_test(-272.15, Celcius, Kelvin), 1.0);
assert_eq!(convert_test(-15.0, Celcius, Fahrenheit), 5.0);
assert_eq!(convert_test(80.33, Fahrenheit, Kelvin), 300.0);
assert_eq!(convert_test(5.0, Fahrenheit, Celcius), -15.0);
}
}