public IUnitMetaConfig ConvertValueBased(Unit second, Func <decimal, decimal> firstToSecond, Func <decimal, decimal> secondToFirst)
{
if (PhysicalUnit == null)
{
PhysicalUnit = unit.DerivePhysicalUnitsFromConstituentParts();
}
if (PhysicalUnit.IsDimensionless())
{
throw new InvalidOperationException("You must define physical unit of the left-hand side");
}
var unitMeta = second.GetUnitData();
if (unitMeta == null || unitMeta.PhysicalUnit.IsDimensionless())
{
// If right-hand side of conversion has no physical unit, we'll assume that it has the same physical unit as left-hand.
unitMeta = (UnitMeta)config.Unit(second).IsPhysicalUnit(PhysicalUnit);
}
if (unitMeta.PhysicalUnit != PhysicalUnit)
{
throw new InvalidOperationException("You can only define conversions between units that are compatible as physical units");
}
var node = config.UnitGraph.AddUnit(second);
ConversionInfo.AddConversion(node, firstToSecond);
node.AddConversion(ConversionInfo, secondToFirst);
return(this);
}
IUnitScale IUnitScale.To(Unit singleUnit, int scale)
{
var newUnit = config.Unit(singleUnit)
.IsPhysicalUnit(precedingUnit.PhysicalUnit)
.ConvertValueBased(precedingUnit.Unit, v => v * scale, v => v / scale);
((IUnitMetaConfig)precedingUnit).ConvertValueBased(singleUnit, v => v / scale, v => v * scale);
precedingUnit = (UnitMeta)newUnit;
return(this);
}