/// <summary>
/// Creates an unit system from the given prototype. This can be useful when
/// e.g. extending one of the standard unit systems with custom units.
/// If the prototype is an UnitSystem the created unit system will be an
/// identical copy of the unit system. If not, only units that are convertible
/// to the base unit will be added.
/// </summary>
/// <param name="prototype"></param>
/// <returns></returns>
public static UnitSystem CreateFrom(IUnitSystem prototype)
{
if (prototype is UnitSystem)
{
return((UnitSystem)((UnitSystem)prototype).Clone());
}
UnitSystem system = new UnitSystem();
foreach (IDimension dimension in prototype.Dimensions)
{
system.AddDimension(dimension);
// Register base unit
IUnit baseUnit = prototype.GetBaseUnit(dimension);
system.AddBaseUnit(baseUnit);
// Register scaled units
foreach (IUnit unit in prototype.GetSupportedUnits(dimension))
{
if (!ReferenceEquals(unit, baseUnit) && prototype.CanConvert(baseUnit, unit))
{
system.AddScaledUnit(baseUnit, unit, prototype.CreateConverter(baseUnit, unit));
}
}
}
return(system);
}
public void LengthTimesLength_Returns_AreaQuantity()
{
// Arrange
SiUnitSystemFactory siFactory = new SiUnitSystemFactory();
IUnitSystem siSystem = siFactory.Create();
StandardQuantitiesCatalog.Setup();
// Act
Quantity <float> width = new Quantity <float>(2.0f, StandardUnitsCatalog.Meter);
Quantity <float> height = new Quantity <float>(4.0f, StandardUnitsCatalog.Meter);
Quantity <float> resultm2 = (Quantity <float>)(width * height);
IValueConverter converter = siSystem.CreateConverter(resultm2.Unit, StandardUnitsCatalog.SquareCentimeter);
Assert.NotNull(converter);
Quantity <float> resultcm2 = new Quantity <float>(converter.Convert(resultm2.Value), converter.Target);
// Assert
Assert.AreEqual(8.0f, resultm2.Value);
Assert.AreEqual(StandardUnitsCatalog.SquareMeter, resultm2.Unit);
Assert.AreEqual(StandardDimensionsCatalog.Area, resultm2.Dimension);
Assert.AreEqual(StandardDimensionsCatalog.Area, resultcm2.Dimension);
Assert.AreEqual(resultm2.Value * 100.0f * 100.0f, resultcm2.Value);
}
private void ConvertTemperatures()
{
var celcius = new Quantity <double>(20, StandardUnitsCatalog.Celcius);
IValueConverter toKelvin = _siSystem.CreateConverter(celcius.Unit, StandardUnitsCatalog.Kelvin);
IValueConverter toFahrenheit = _siSystem.CreateConverter(celcius.Unit, StandardUnitsCatalog.Fahrenheit);
var kelvin = new Quantity <double>(toKelvin.Convert(celcius.Value), toKelvin.Target);
var fahrenheit = new Quantity <double>(toFahrenheit.Convert(celcius.Value), toFahrenheit.Target);
IValueConverter fromFtoK = _siSystem.CreateConverter(fahrenheit.Unit, StandardUnitsCatalog.Kelvin);
var kelvinFromFahrenheit = new Quantity <double>(fromFtoK.Convert(fahrenheit.Value), toKelvin.Target);
Console.WriteLine("--- Temperature conversion ---");
Console.WriteLine("{0} is equivalent to {1}", celcius, fahrenheit);
Console.WriteLine("{0} is equivalent to {1}", celcius, kelvin);
Console.WriteLine("{0} is equivalent to {1}", fahrenheit, kelvinFromFahrenheit);
Console.WriteLine();
}
