private static IfcDerivedUnit AddIfcDerivedUnit(
Ifc4.Document document,
Unit unit,
IfcDerivedUnit ifcDerivedUnit
)
{
if (document.Project.UnitsInContext == null)
document.Project.UnitsInContext = new IfcUnitAssignment();
var ifcUnitAssignment = document.Project.UnitsInContext;
if (ifcUnitAssignment.Units == null)
ifcUnitAssignment.Units = new IfcUnitAssignmentUnits();
var ifcUnitAssignmentUnits = ifcUnitAssignment.Units;
ifcUnitAssignmentUnits.Items.Add(ifcDerivedUnit);
return ifcDerivedUnit;
}
/// <summary>
/// Get the full name of the IfcDerivedUnit
/// </summary>
/// <returns>string holding full name</returns>
public static string GetName(this IfcDerivedUnit ifcDerivedUnit)
{
if (ifcDerivedUnit.UserDefinedType.HasValue)
{
return(ifcDerivedUnit.UserDefinedType);
}
else
{
List <string> values = new List <string>();
foreach (IfcDerivedUnitElement item in ifcDerivedUnit.Elements)//loop the units associated to this type
{
string value = string.Empty;
value = item.Unit.GetName();
//add power
if (item.Exponent > 0)
{
if (item.Exponent == 2)
{
value += '\u00B2';//add ² ((char)0x00B2)
}
else if (item.Exponent == 3)
{
value += '\u00B3';//add ³ //((char)0x00B3)
}
else
{
value += "Pow:" + item.Exponent.ToString();
}
}
}
if (values.Count > 1)
{
return(string.Join("/", values));
}
else
{
return(string.Empty);
}
}
}
internal Entity AddUnitToIfcDocument(Ifc4.Document document, Ifc4.Unit unit)
{
if (document == null)
throw new ArgumentNullException("AddUnitToIfcDocument(Ifc4.Document document, ...)");
if (unit == null)
throw new ArgumentNullException("AddUnitToIfcDocument(..., Unit unit)");
Entity entity = null;
if (unit.Key == "m")
{
entity = AddIfcSIUnit(document, unit, IfcUnitEnum.Lengthunit, null, IfcSIUnitName.Metre);
}
else if (unit.Key == "dm")
{
entity = AddIfcSIUnit(document, unit, IfcUnitEnum.Lengthunit, IfcSIPrefix.Deci, IfcSIUnitName.Metre);
}
else if (unit.Key == "cm")
{
entity = AddIfcSIUnit(document, unit, IfcUnitEnum.Lengthunit, IfcSIPrefix.Centi, IfcSIUnitName.Metre);
}
else if (unit.Key == "mm")
{
entity = AddIfcSIUnit(document, unit, IfcUnitEnum.Lengthunit, IfcSIPrefix.Milli, IfcSIUnitName.Metre);
}
else if (unit.Key == "m²")
{
entity = AddIfcSIUnit(document, unit, IfcUnitEnum.Areaunit, null, IfcSIUnitName.SquareMetre);
}
else if (unit.Key == "dm²")
{
entity = AddIfcSIUnit(document, unit, IfcUnitEnum.Areaunit, IfcSIPrefix.Deci, IfcSIUnitName.SquareMetre);
}
else if (unit.Key == "cm²")
{
entity = AddIfcSIUnit(document, unit, IfcUnitEnum.Areaunit, IfcSIPrefix.Centi, IfcSIUnitName.SquareMetre);
}
else if (unit.Key == "mm²")
{
entity = AddIfcSIUnit(document, unit, IfcUnitEnum.Areaunit, IfcSIPrefix.Milli, IfcSIUnitName.SquareMetre);
}
else if (unit.Key == "m³")
{
entity = AddIfcSIUnit(document, unit, IfcUnitEnum.Volumeunit, null, IfcSIUnitName.CubicMetre);
}
else if (unit.Key == "dm³")
{
entity = AddIfcSIUnit(document, unit, IfcUnitEnum.Volumeunit, IfcSIPrefix.Deci, IfcSIUnitName.CubicMetre);
}
else if (unit.Key == "cm³")
{
entity = AddIfcSIUnit(document, unit, IfcUnitEnum.Volumeunit, IfcSIPrefix.Centi, IfcSIUnitName.CubicMetre);
}
else if (unit.Key == "mm³")
{
entity = AddIfcSIUnit(document, unit, IfcUnitEnum.Volumeunit, IfcSIPrefix.Milli, IfcSIUnitName.CubicMetre);
}
// 1Liter = 1dm³
// 1m³ = 1000dm³
else if (unit.Key == "l" || unit.Key == "Liter")
{
entity = AddIfcSIUnit(document, unit, IfcUnitEnum.Volumeunit, IfcSIPrefix.Deci, IfcSIUnitName.CubicMetre);
}
else if (unit.Key == "V")
{
entity = AddIfcSIUnit(document, unit, IfcUnitEnum.Electricvoltageunit, null, IfcSIUnitName.Volt);
}
else if (unit.Key == "J")
{
entity = AddIfcSIUnit(document, unit, IfcUnitEnum.Energyunit, null, IfcSIUnitName.Joule);
}
else if (unit.Key == "°C")
{
entity = AddIfcSIUnit(document, unit, IfcUnitEnum.Thermodynamictemperatureunit, null, IfcSIUnitName.DegreeCelsius);
}
else if (unit.Key == "A")
{
entity = AddIfcSIUnit(document, unit, IfcUnitEnum.Electriccurrentunit, null, IfcSIUnitName.Ampere);
}
else if (unit.Key == "Hz") // 1/s
{
entity = AddIfcSIUnit(document, unit, IfcUnitEnum.Frequencyunit, null, IfcSIUnitName.Hertz);
}
else if (unit.Key == "N")
{
entity = AddIfcSIUnit(document, unit, IfcUnitEnum.Forceunit, null, IfcSIUnitName.Newton);
}
else if (unit.Key == "kg")
{
entity = AddIfcSIUnit(document, unit, IfcUnitEnum.Massunit, IfcSIPrefix.Kilo, IfcSIUnitName.Gram);
}
else if (unit.Key == "g")
{
entity = AddIfcSIUnit(document, unit, IfcUnitEnum.Massunit, null, IfcSIUnitName.Gram);
}
else if (unit.Key == "s")
{
entity = AddIfcSIUnit(document, unit, IfcUnitEnum.Timeunit, null, IfcSIUnitName.Second);
}
else if (unit.Key == "m/s")
{
IfcDerivedUnit ifcDerivedUnit = new IfcDerivedUnit()
{
Id = document.GetNextSid(),
UnitType = IfcDerivedUnitEnum.Linearvelocityunit,
UnitTypeSpecified = true,
Elements = new IfcDerivedUnitElements()
};
ifcDerivedUnit.Elements.IfcDerivedUnitElement.AddRange(
new IfcDerivedUnitElement[]
{
new IfcDerivedUnitElement()
{
Id = document.GetNextSid(),
Exponent = 1,
ExponentSpecified = true,
Unit = new IfcSIUnit()
{
UnitType = IfcUnitEnum.Lengthunit,
UnitTypeSpecified = true,
}
},
new IfcDerivedUnitElement()
{
Id = document.GetNextSid(),
Exponent = -1,
ExponentSpecified = true,
Unit = new IfcSIUnit()
{
UnitType = IfcUnitEnum.Timeunit,
UnitTypeSpecified = true,
}
}
}
);
entity = AddIfcDerivedUnit(document, unit, ifcDerivedUnit);
}
else if (unit.Key == "m/s²")
{
IfcDerivedUnit ifcDerivedUnit = new IfcDerivedUnit()
{
Id = document.GetNextSid(),
UnitType = IfcDerivedUnitEnum.Accelerationunit,
UnitTypeSpecified = true,
Elements = new IfcDerivedUnitElements()
};
ifcDerivedUnit.Elements.IfcDerivedUnitElement.AddRange(
new IfcDerivedUnitElement[]
{
new IfcDerivedUnitElement()
{
Id = document.GetNextSid(),
Exponent = 1,
ExponentSpecified = true,
Unit = new IfcSIUnit()
{
UnitType = IfcUnitEnum.Lengthunit,
UnitTypeSpecified = true,
}
},
new IfcDerivedUnitElement()
{
Id = document.GetNextSid(),
Exponent = -2,
ExponentSpecified = true,
Unit = new IfcSIUnit
{
UnitType = IfcUnitEnum.Timeunit,
UnitTypeSpecified = true,
}
}
}
);
entity = AddIfcDerivedUnit(document, unit, ifcDerivedUnit);
}
else if (unit.Key == "m³/h")
{
IfcDerivedUnit ifcDerivedUnit = new IfcDerivedUnit()
{
Id = document.GetNextSid(),
UnitType = IfcDerivedUnitEnum.Volumetricflowrateunit,
UnitTypeSpecified = true,
Elements = new IfcDerivedUnitElements()
};
ifcDerivedUnit.Elements.IfcDerivedUnitElement.AddRange(
new IfcDerivedUnitElement[]
{
new IfcDerivedUnitElement()
{
Id = document.GetNextSid(),
Exponent = 3,
ExponentSpecified = true,
Unit = new IfcSIUnit()
{
UnitType = IfcUnitEnum.Lengthunit,
UnitTypeSpecified = true
}
},
new IfcDerivedUnitElement()
{
Id = document.GetNextSid(),
Exponent = -1,
ExponentSpecified = true,
Unit = new IfcConversionBasedUnit
{
Name = "Hour",
UnitType = IfcUnitEnum.Timeunit,
UnitTypeSpecified = true,
ConversionFactor = new IfcMeasureWithUnit()
{
ValueComponent = new IfcMeasureWithUnitValueComponent()
{
Item = new IfcTimeMeasurewrapper()
{
Value = 3600.0
}
},
UnitComponent = new IfcMeasureWithUnitUnitComponent()
{
Item = new IfcSIUnit()
{
UnitType = IfcUnitEnum.Timeunit,
UnitTypeSpecified = true
}
}
}
}
}
}
);
entity = AddIfcDerivedUnit(document, unit, ifcDerivedUnit);
}
else if (unit.Key == "Ah")
{
IfcDerivedUnit ifcDerivedUnit = new IfcDerivedUnit()
{
Id = document.GetNextSid(),
UnitType = IfcDerivedUnitEnum.Heatfluxdensityunit,
UnitTypeSpecified = true,
Elements = new IfcDerivedUnitElements()
};
ifcDerivedUnit.Elements.IfcDerivedUnitElement.AddRange(
new IfcDerivedUnitElement[]
{
new IfcDerivedUnitElement()
{
Id = document.GetNextSid(),
Exponent = 1,
ExponentSpecified = true,
Unit = new IfcSIUnit()
{
UnitType = IfcUnitEnum.Electriccurrentunit,
UnitTypeSpecified = true
}
},
new IfcDerivedUnitElement()
{
Id = document.GetNextSid(),
Exponent = -1,
ExponentSpecified = true,
Unit = new IfcConversionBasedUnit
{
Name = "Hour",
UnitType = IfcUnitEnum.Timeunit,
UnitTypeSpecified = true,
ConversionFactor = new IfcMeasureWithUnit()
{
ValueComponent = new IfcMeasureWithUnitValueComponent()
{
Item = new IfcTimeMeasurewrapper()
{
Value = 3600.0
}
},
UnitComponent = new IfcMeasureWithUnitUnitComponent()
{
Item = new IfcSIUnit()
{
UnitType = IfcUnitEnum.Timeunit,
UnitTypeSpecified = true
}
}
}
}
}
}
);
entity = AddIfcDerivedUnit(document, unit, ifcDerivedUnit);
}
else if (unit.Key == "Ohm")
{
entity = AddIfcSIUnit(document, unit, IfcUnitEnum.Electricresistanceunit, null, IfcSIUnitName.Ohm);
}
else if (unit.Key == "kg/m³")
{
IfcDerivedUnit ifcDerivedUnit = new IfcDerivedUnit()
{
Id = document.GetNextSid(),
UnitType = IfcDerivedUnitEnum.Massdensityunit,
UnitTypeSpecified = true,
Elements = new IfcDerivedUnitElements()
};
ifcDerivedUnit.Elements.IfcDerivedUnitElement.AddRange(
new IfcDerivedUnitElement[]
{
new IfcDerivedUnitElement()
{
Id = document.GetNextSid(),
Exponent = 1,
ExponentSpecified = true,
Unit = new IfcSIUnit()
{
UnitType = IfcUnitEnum.Massunit,
UnitTypeSpecified = true,
}
},
new IfcDerivedUnitElement()
{
Id = document.GetNextSid(),
Exponent = -3,
ExponentSpecified = true,
Unit = new IfcSIUnit
{
UnitType = IfcUnitEnum.Lengthunit,
UnitTypeSpecified = true,
}
}
}
);
entity = AddIfcDerivedUnit(document, unit, ifcDerivedUnit);
}
else if (unit.Key == "N/m²")
{
IfcDerivedUnit ifcDerivedUnit = new IfcDerivedUnit()
{
Id = document.GetNextSid(),
UnitType = IfcDerivedUnitEnum.Planarforceunit,
UnitTypeSpecified = true,
Elements = new IfcDerivedUnitElements()
};
ifcDerivedUnit.Elements.IfcDerivedUnitElement.AddRange(
new IfcDerivedUnitElement[]
{
new IfcDerivedUnitElement()
{
Id = document.GetNextSid(),
Exponent = 1,
ExponentSpecified = true,
Unit = new IfcSIUnit()
{
UnitType = IfcUnitEnum.Forceunit,
UnitTypeSpecified = true,
}
},
new IfcDerivedUnitElement()
{
Id = document.GetNextSid(),
Exponent = -2,
ExponentSpecified = true,
Unit = new IfcSIUnit()
{
UnitType = IfcUnitEnum.Lengthunit,
UnitTypeSpecified = true,
}
}
}
);
entity = AddIfcDerivedUnit(document, unit, ifcDerivedUnit);
}
else if (unit.Key == "W/m²")
{
IfcDerivedUnit ifcDerivedUnit = new IfcDerivedUnit()
{
Id = document.GetNextSid(),
UnitType = IfcDerivedUnitEnum.Heatfluxdensityunit,
UnitTypeSpecified = true,
Elements = new IfcDerivedUnitElements()
};
ifcDerivedUnit.Elements.IfcDerivedUnitElement.AddRange(
new IfcDerivedUnitElement[]
{
new IfcDerivedUnitElement()
{
Id = document.GetNextSid(),
Exponent = 1,
ExponentSpecified = true,
Unit = new IfcSIUnit()
{
UnitType = IfcUnitEnum.Powerunit,
UnitTypeSpecified = true,
}
},
new IfcDerivedUnitElement()
{
Id = document.GetNextSid(),
Exponent = -2,
ExponentSpecified = true,
Unit = new IfcSIUnit
{
UnitType = IfcUnitEnum.Lengthunit,
UnitTypeSpecified = true,
}
}
}
);
entity = AddIfcDerivedUnit(document, unit, ifcDerivedUnit);
}
else if (unit.Key == "W")
{
entity = AddIfcSIUnit(document, unit, IfcUnitEnum.Powerunit, null, IfcSIUnitName.Watt);
}
else if (unit.Key == "kW")
{
entity = AddIfcSIUnit(document, unit, IfcUnitEnum.Powerunit, IfcSIPrefix.Kilo, IfcSIUnitName.Watt);
}
else if (unit.Key == "Pa")
{
entity = AddIfcSIUnit(document, unit, IfcUnitEnum.Pressureunit, null, IfcSIUnitName.Pascal);
}
else if (unit.Key == "db")
{
IfcDerivedUnit ifcDerivedUnit = new IfcDerivedUnit()
{
Id = document.GetNextSid(),
UnitType = IfcDerivedUnitEnum.Soundpowerlevelunit,
UnitTypeSpecified = true,
Elements = new IfcDerivedUnitElements()
};
ifcDerivedUnit.Elements.IfcDerivedUnitElement.AddRange(
new IfcDerivedUnitElement[]
{
new IfcDerivedUnitElement()
{
Id = document.GetNextSid(),
Exponent = 1,
ExponentSpecified = true,
Unit = new IfcSIUnit()
{
UnitType = IfcUnitEnum.Powerunit,
UnitTypeSpecified = true,
}
},
new IfcDerivedUnitElement()
{
Id = document.GetNextSid(),
Exponent = -1,
ExponentSpecified = true,
Unit = new IfcSIUnit
{
UnitType = IfcUnitEnum.Powerunit,
UnitTypeSpecified = true,
}
}
}
);
entity = AddIfcDerivedUnit(document, unit, ifcDerivedUnit);
}
if (entity == null)
throw new NullReferenceException("AddUnitToIfcDocument - Entity = null");
return entity;
}
private static void Main(string[] args)
{
var database = new DatabaseIfc(ModelView.Ifc4X3NotAssigned);
database.Factory.ApplicationDeveloper = "Sebastian Esser";
// turn owner history off
database.Factory.Options.GenerateOwnerHistory = false;
// basic setup
var site = new IfcSite(database, "SiteA");
var project = new IfcProject(
site,
"SampleProject with a span annotation",
IfcUnitAssignment.Length.Metre
);
// create an annotation
var annotation = new IfcAnnotation(database)
{
Name = "DesignSpeed",
};
annotation.AddComment("Annotation item span-placed along the alignment");
// link annotation with site
var contained = new IfcRelContainedInSpatialStructure(site);
contained.RelatedElements.Add(annotation);
#region Alignment
var alignment = new IfcAlignment(site)
{
Name = "Basic alignment with a single horizontal segment"
};
alignment.AddComment("Generate alignment representation");
// semantic
var horizSegment = new IfcAlignmentHorizontalSegment(
new IfcCartesianPoint(database, 5, 10),
0,
0,
0,
200,
IfcAlignmentHorizontalSegmentTypeEnum.LINE);
// geometric representation of a single segment. It gets referenced by IfcCompositeCurve.segments and IfcAlignmentSegment.Representation
var curveSegment = new IfcCurveSegment(
IfcTransitionCode.CONTSAMEGRADIENTSAMECURVATURE,
new IfcAxis2Placement2D(new IfcCartesianPoint(database, 0, 0)),
new IfcParameterValue(0),
new IfcParameterValue(200),
null);
var segments = new List <IfcSegment> {
curveSegment
};
var compositeCurve = new IfcCompositeCurve(segments);
var rep = new IfcShapeRepresentation(compositeCurve)
{
RepresentationIdentifier = "Axis",
RepresentationType = "Curve2D"
};
alignment.Representation = new IfcProductDefinitionShape(rep);
alignment.Axis = compositeCurve;
// create an alignment horizontal instance that takes a list of horizontal segments
var alignmentHorizontal = new IfcAlignmentHorizontal(database)
{
Segments = new LIST <IfcAlignmentHorizontalSegment>()
{
horizSegment
}
};
// link alignment and and its horizontal part semantically
new IfcRelAggregates(alignment, alignmentHorizontal);
// create a new alignmentSegment with then gets one curve segment as its geometric representation
var alignmentSegment = new IfcAlignmentSegment(database);
// link horizontal alignment with the recently created alignment segment
new IfcRelNests(alignmentHorizontal, alignmentSegment); // sorted list -> IfcRelNests
// connect geom representation to this segment
alignmentSegment.Representation = new IfcProductDefinitionShape(new IfcShapeRepresentation(curveSegment));
#endregion Alignment
#region Annotation placement
alignmentSegment.AddComment("Create placement for annotation");
var axis2place = new IfcAxis2PlacementLinear(
new IfcPointByDistanceExpression(25, compositeCurve),
null,
null);
var linPlacement = new IfcLinearPlacement(axis2place);
linPlacement.Distance = new IfcPointByDistanceExpression(128, compositeCurve);
annotation.ObjectPlacement = linPlacement;
#endregion Annotation placement
#region PSet
//var lengthUnit = new IfcSIUnit(database, IfcUnitEnum.LENGTHUNIT, IfcSIPrefix.NONE, IfcSIUnitName.METRE);
var lengthDerivedUnit = new IfcSIUnit(database, IfcUnitEnum.LENGTHUNIT, IfcSIPrefix.KILO, IfcSIUnitName.METRE);
lengthDerivedUnit.AddComment("PSet setup");
var timeBaseUnit = new IfcSIUnit(database, IfcUnitEnum.TIMEUNIT, IfcSIPrefix.NONE, IfcSIUnitName.SECOND);
var timeDerivedUnit = new IfcConversionBasedUnit(IfcUnitEnum.TIMEUNIT, "hour", new IfcMeasureWithUnit(new IfcPositiveInteger(3600), timeBaseUnit));
var ifcderivedunitelem1 = new IfcDerivedUnitElement(lengthDerivedUnit, 1);
var ifcderivedunitelem2 = new IfcDerivedUnitElement(timeDerivedUnit, -1);
var speedUnit = new IfcDerivedUnit(
new List <IfcDerivedUnitElement> {
ifcderivedunitelem1, ifcderivedunitelem2
},
IfcDerivedUnitEnum.LINEARVELOCITYUNIT);
var pSet = new IfcPropertySet(annotation, "PSET_SpeedData", new List <IfcProperty>
{
new IfcPropertySingleValue(database, "CargoSpeed", new IfcLinearVelocityMeasure(60), speedUnit),
new IfcPropertySingleValue(database, "DesignSpeed", new IfcLinearVelocityMeasure(110), speedUnit)
});
#endregion PSet
database.WriteFile("AlignmentWithSpanAnnotation.ifc");
}
/// <summary>
/// Extract the unit name
/// </summary>
/// <param name="ifcUnit">ifcUnit object to get unit name from</param>
/// <returns>string holding unit name</returns>
public static string GetUnitName(IfcUnit ifcUnit)
{
string value = "";
string sqText = "";
string prefixUnit = "";
if (ifcUnit is IfcSIUnit)
{
IfcSIUnit ifcSIUnit = ifcUnit as IfcSIUnit;
prefixUnit = (ifcSIUnit.Prefix != null) ? ifcSIUnit.Prefix.ToString() : ""; //see IfcSIPrefix
value = ifcSIUnit.Name.ToString(); //see IfcSIUnitName
if (!string.IsNullOrEmpty(value))
{
if (value.Contains("_"))
{
string[] split = value.Split('_');
if (split.Length > 1)
{
sqText = split.First(); //see if _ delimited value such as SQUARE_METRE
}
value = sqText + prefixUnit + split.Last(); //combine to give full unit name
}
else
{
value = prefixUnit + value; //combine to give length name
}
}
}
else if (ifcUnit is IfcConversionBasedUnit)
{
IfcConversionBasedUnit IfcConversionBasedUnit = ifcUnit as IfcConversionBasedUnit;
value = (IfcConversionBasedUnit.Name != null) ? IfcConversionBasedUnit.Name.ToString() : "";
if (!string.IsNullOrEmpty(value))
{
if (value.Contains("_"))
{
string[] split = value.Split('_');
if (split.Length > 1)
{
sqText = split.First(); //see if _ delimited value such as SQUARE_METRE
}
value = sqText + split.Last(); //combine to give full unit name
}
}
}
else if (ifcUnit is IfcContextDependentUnit)
{
IfcContextDependentUnit ifcContextDependentUnit = ifcUnit as IfcContextDependentUnit;
value = ifcContextDependentUnit.Name;
if (string.IsNullOrEmpty(value)) //fall back to UnitType enumeration
{
value = ifcContextDependentUnit.UnitType.ToString();
}
}
else if (ifcUnit is IfcDerivedUnit)
{
IfcDerivedUnit ifcDerivedUnit = ifcUnit as IfcDerivedUnit;
value = ifcDerivedUnit.UnitType.ToString();
if ((string.IsNullOrEmpty(value)) && (ifcDerivedUnit.UserDefinedType != null)) //fall back to user defined
{
value = ifcDerivedUnit.UserDefinedType;
}
}
else if (ifcUnit is IfcMonetaryUnit)
{
value = GetMonetaryUnitName(ifcUnit as IfcMonetaryUnit);
return((string.IsNullOrEmpty(value)) ? DEFAULT_STRING : value); //don't want to lower case so return here
}
value = (string.IsNullOrEmpty(value)) ? DEFAULT_STRING : value.ToLower();
//check for unit spelling on meter/metre
if (value.Contains("metre") || value.Contains("meter"))
{
string culturemetre = ErrorDescription.meter;
if (!string.IsNullOrEmpty(culturemetre))
{
if (value.Contains("metre"))
{
value = value.Replace("metre", culturemetre);
}
else
{
value = value.Replace("meter", culturemetre);
}
}
}
return(value);
}
/// <summary>
/// Get the html version of the Derived unit
/// </summary>
/// <param name="ifcDerivedUnit">IfcDerivedUnit to get name for</param>
/// <returns>String holding name</returns>
public static string GetDerivedUnitName(IfcDerivedUnit ifcDerivedUnit)
{
string unit = string.Empty;
if (ifcDerivedUnit.UserDefinedType.HasValue)
unit = ifcDerivedUnit.UserDefinedType;
else
{
List<string> values = new List<string>();
foreach (IfcDerivedUnitElement item in ifcDerivedUnit.Elements)//loop the units associated to this type
{
string value = string.Empty;
value = item.Unit.GetName();
//add power
if (item.Exponent > 0)
{
value += "<sup>" + item.Exponent.ToString() + "</sup>";
}
}
if (values.Count > 1)
unit = string.Join("/", values);
else
unit = string.Empty;
}
return unit;
}