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Ingy döt Net 2023-07-01 11:58:00 -04:00
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Task/Temperature-conversion/AppleScript/temperature-conversion-4.applescript Normal file
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use AppleScript version "2.5" -- macOS 10.12 (Sierra) or later
use framework "Foundation"
on convertFromKelvin(kelvinValue)
set |⌘| to current application
-- Set up an NSMeasurement object representing the given number of Kelvin units.
set kelvinUnit to |⌘|'s class "NSUnitTemperature"'s kelvin()
set kelvinMeasurement to |⌘|'s class "NSMeasurement"'s alloc()'s initWithDoubleValue:(kelvinValue) unit:(kelvinUnit)
-- Get value of the same measurement in each of the other "units" in turn.
set celsiusUnit to |⌘|'s class "NSUnitTemperature"'s celsius()
set celsiusMeasurement to kelvinMeasurement's measurementByConvertingToUnit:(celsiusUnit)
set celsiusValue to celsiusMeasurement's doubleValue()
set fahrenheitUnit to |⌘|'s class "NSUnitTemperature"'s fahrenheit()
set fahrenheitMeasurement to kelvinMeasurement's measurementByConvertingToUnit:(fahrenheitUnit)
set fahrenheitValue to fahrenheitMeasurement's doubleValue()
-- There's no predefined unit for Rankine (as at macOS 10.14 Mojave), but custom units are easy to define.
-- A unit's linear 'converter' must contain the unit's size and zero offset relative to those of its class's "base unit"
-- which for temperatures is the 'kelvin' unit.
set rankineConverter to |⌘|'s class "NSUnitConverterLinear"'s alloc()'s initWithCoefficient:(5 / 9) |constant|:(0)
set rankineUnit to |⌘|'s class "NSUnitTemperature"'s alloc()'s initWithSymbol:("°R") converter:(rankineConverter)
set rankineMeasurement to kelvinMeasurement's measurementByConvertingToUnit:(rankineUnit)
set rankineValue to rankineMeasurement's doubleValue()
return ("K" & tab & (kelvinValue as real)) & ¬
(linefeed & "C" & tab & celsiusValue) & ¬
(linefeed & "F" & tab & fahrenheitValue) & ¬
(linefeed & "R" & tab & rankineValue)
end convertFromKelvin
convertFromKelvin(21)