/// <summary>
///
/// </summary>
/// <param name="quantity"></param>
/// <returns></returns>
public static TimeSpan ToTimeSpan(this IQuantity quantity)
{
quantity.VerifyNotNull().VerifyTimeQuantity();
var dimension = quantity.Dimensions.SingleOrDefault();
// ReSharper disable once PossibleNullReferenceException
if (dimension.Equals(T.Microsecond))
{
var millisecondQty = quantity.ConvertTo(T.Millisecond);
millisecondQty.Value = Math.Min(millisecondQty.Value, TimeSpan.MaxValue.TotalMilliseconds - 1);
millisecondQty.Value = Math.Max(millisecondQty.Value, TimeSpan.MinValue.TotalMilliseconds + 1);
return(TimeSpan.FromMilliseconds(millisecondQty.Value));
}
if (dimension.Equals(T.Millisecond))
{
return(TimeSpan.FromMilliseconds(quantity.Value));
}
if (dimension.Equals(T.Second))
{
return(TimeSpan.FromSeconds(quantity.Value));
}
if (dimension.Equals(T.Minute))
{
return(TimeSpan.FromMinutes(quantity.Value));
}
if (dimension.Equals(T.Hour))
{
return(TimeSpan.FromHours(quantity.Value));
}
if (dimension.Equals(T.Day))
{
return(TimeSpan.FromDays(quantity.Value));
}
// ReSharper disable once ConvertIfStatementToReturnStatement
if (dimension.Equals(T.Week))
{
return(TimeSpan.FromDays(quantity.ConvertTo(T.Day).Value));
}
return(TimeSpan.Zero);
}
/// <summary>
/// Returns the cotangent of the specified <paramref name="angle"/>.
/// </summary>
/// <param name="angle"></param>
/// <returns></returns>
/// <see cref="SiTheta.Radian"/>
/// <see cref="UsTheta.Degree"/>
public static IQuantity Cot(this IQuantity angle)
{
const double max = 360d;
angle.VerifyAngular();
/* The operators are still a little bit of a work in progress, handling what to do
* about converting to/from base approaching the core calculation. For purposes of
* trig functions, however, we actually sometimes want these in terms of degrees,
* not Radians, for purposes of evaluation. */
var angleDegreesValue = angle.ConvertTo(UsTheta.Degree).Value;
// This is likely not wholely correct, but it is close enough.
if ((angleDegreesValue % max).Equals(0d))
{
return(new Quantity(double.PositiveInfinity));
}
if ((angleDegreesValue % max).Equals(180d))
{
return(new Quantity(double.NegativeInfinity));
}
var sine = CalculateDimensionless(angle, Math.Sin);
var cosine = (Quantity)CalculateDimensionless(angle, Math.Cos);
return(cosine / sine);
}
//private static bool IsDegree(this IQuantity angle, double expectedAngle)
//{
// angle.VerifyAngular();
// // TODO: might be better if we had an actual IEquatable<IQuantiy> here ...
// return angle.ConvertTo(UsTheta.Degree).Value.Equals(expectedAngle);
//}
private static IQuantity CalculateDimensionless(this IQuantity angle, Func <double, double> trigonometry)
{
angle.VerifyAngular();
var theta = angle.ConvertTo(SiTheta.Radian);
var result = new Quantity(trigonometry(theta.Value));
return(result);
}
internal ConversionContext ConvertTo(double expectedValue, params IDimension[] units)
{
_converted = _original.ConvertTo(units);
// We do not care about exponents in this instances, only the dimensions themselves.
Assert.That(_original.Dimensions.AreCompatible(units, true));
Assert.That(_converted.Value, Is.EqualTo(expectedValue).Within(_epsilon));
VerifyUnitsNotSame(_converted, units);
return(this);
}
public void TestKelvinPerSecondConvertedToCe_per_s()
{
// 2013-09-05 From CodePlex User JuricaGrcic
// Define Celsius per second - °C/s
Unit Ce_per_s = SI.Ce.CombineDivide(SI.s);
// Define Kelvin per second - K/s
Unit Kelvin_per_s = SI.K.CombineDivide(SI.s);
// Create value in units °C/s
Quantity valueOfCelsiusPerSecond = new Quantity(2, Ce_per_s);
//Console.WriteLine("Base value : {0}", valueOfCelsiusPerSecond);
// prints 2 °C/s
string valueOfCelsiusPerSecond_str = valueOfCelsiusPerSecond.ToString();
string valueOfCelsiusPerSecond_str_expected = "2 °C/s";
// Convert °C/s to K/s
IQuantity valueOfKelvinPerSecond = valueOfCelsiusPerSecond.ConvertTo(Kelvin_per_s);
//Console.WriteLine("Base value converted to {0} : {1}", Ce_per_s, valueOfKelvinPerSecond);
// prints 275.15 K/s - correct conversion or not??
// 2013-10-29 Corrected to print 2 K/s
string valueOfKelvinPerSecond_str = valueOfKelvinPerSecond.ToString();
string valueOfKelvinPerSecond_str_expected = "2 K/s";
// Convert K/s back to °C/s
IQuantity valueOfKelvinPerSecondConvertedToCe_per_s = valueOfKelvinPerSecond.ConvertTo(Ce_per_s);
//Console.WriteLine("{0} converted back to {1}: {2}", Kelvin_per_s, Ce_per_s, valueOfKelvinPerSecond.ConvertTo(Ce_per_s));
// prints 1.0036476381543 °C/s - should print 2 °C/s - incorrect conversion
string valueOfKelvinPerSecondConvertedToCe_per_s_str = valueOfKelvinPerSecondConvertedToCe_per_s.ToString();
string valueOfKelvinPerSecondConvertedToCe_per_s_str_expected = "2 °C/s";
Assert.AreEqual(valueOfCelsiusPerSecond, valueOfKelvinPerSecondConvertedToCe_per_s);
Assert.AreEqual(valueOfCelsiusPerSecond_str, valueOfCelsiusPerSecond_str_expected);
Assert.AreEqual(valueOfKelvinPerSecond_str, valueOfKelvinPerSecond_str_expected);
Assert.AreEqual(valueOfKelvinPerSecondConvertedToCe_per_s_str, valueOfKelvinPerSecondConvertedToCe_per_s_str_expected);
}
/// <summary>
/// Returns the tangent of the specified <paramref name="angle"/>.
/// </summary>
/// <param name="angle"></param>
/// <returns></returns>
/// <see cref="SiTheta.Radian"/>
/// <see cref="UsTheta.Degree"/>
/// <a href="!:http://msdn.microsoft.com/en-us/library/system.math.tan.aspx" />
/// <a href="!:http://www.quora.com/Is-tan-90%C2%B0-equal-to-infinity" />
public static IQuantity Tan(this IQuantity angle)
{
/* These are a couple of corner cases that the Math library does not take into
* account, or returned an "undefined" number, which is technically incorrect.
* http://www.uwgb.edu/dutchs/structge/sl01.htm */
const double max = 360d;
angle.VerifyAngular();
var angleDegreesValue = angle.ConvertTo(UsTheta.Degree).Value;
if ((angleDegreesValue % max).Equals(90d))
{
return(new Quantity(double.PositiveInfinity));
}
if ((angleDegreesValue % max).Equals(270d))
{
return(new Quantity(double.NegativeInfinity));
}
return(CalculateDimensionless(angle, Math.Tan));
}
public IQuantity Plus(IQuantity other)
{
if(null == other) return this;
return new Quantity(Amount + other.ConvertTo(Units).Amount, Units);
}
public bool IsGreaterThan(IQuantity other)
{
return this.Amount > other.ConvertTo(this.Units).Amount;
}