public static string GetSymbol(IIfcDerivedUnit du)
{
var symbol = du.UnitType switch
{
IfcDerivedUnitEnum.PHUNIT => "pH",
IfcDerivedUnitEnum.SOUNDPOWERUNIT => "W",
IfcDerivedUnitEnum.SOUNDPOWERLEVELUNIT => "db",
IfcDerivedUnitEnum.SOUNDPRESSUREUNIT => "Pa",
IfcDerivedUnitEnum.SOUNDPRESSURELEVELUNIT => "db",
_ => string.Empty
};
if (!string.IsNullOrEmpty(symbol))
{
return(symbol);
}
var sb = new StringBuilder();
foreach (var item in du.Elements)
{
var unit = GetSymbol(item.Unit);
sb.Append(unit);
var exponent = GetExponentSymbol(item.Exponent);
sb.Append(exponent);
}
return(sb.ToString());
}
static bool getDerivedUnitRepStr(IIfcUnit unitDef, out IfcDerivedUnitEnum unitType, out string unitRepStr)
{
// Initialize the static Dicts, if it is still empty upon the first use. These Dicts do not need to be reset
setupUnitRep();
unitType = IfcDerivedUnitEnum.USERDEFINED; // initial value
IIfcDerivedUnit derivedUnit = unitDef as IIfcDerivedUnit;
unitType = derivedUnit.UnitType;
unitRepStr = string.Empty;
IList <string> positiveExpUnits = new List <string>();
IList <string> negativeExpUnits = new List <string>();
foreach (IIfcDerivedUnitElement dUnitElem in derivedUnit.Elements)
{
IfcUnitEnum elemUnitType;
string elemUnitRepStr = string.Empty;
int exponent = (int)dUnitElem.Exponent;
if (getNamedUnitRepStr(dUnitElem.Unit, out elemUnitType, out elemUnitRepStr))
{
if (exponent >= 0)
{
if (exponent > 1)
{
elemUnitRepStr = elemUnitRepStr + "^" + exponent.ToString();
}
//elemUnitRepStr = elemUnitRepStr + unicodeSuperScript(exponent);
positiveExpUnits.Add(elemUnitRepStr);
}
else
{
if (exponent < -1)
{
elemUnitRepStr = elemUnitRepStr + "^" + Math.Abs(exponent).ToString();
}
//elemUnitRepStr = elemUnitRepStr + unicodeSuperScript(Math.Abs(exponent));
negativeExpUnits.Add(elemUnitRepStr);
}
}
}
if (positiveExpUnits.Count > 0)
{
foreach (string elemUnit in positiveExpUnits)
{
BIMRLCommon.appendToString(elemUnit, ".", ref unitRepStr);
//BAIFCCommon.appendToString(elemUnit, "\u22C5", ref negUnitRepStr);
}
}
else
{
if (negativeExpUnits.Count > 0)
{
unitRepStr = "1";
}
}
string negUnitRepStr = string.Empty;
if (negativeExpUnits.Count > 0)
{
foreach (string elemUnit in negativeExpUnits)
{
BIMRLCommon.appendToString(elemUnit, "ยท", ref negUnitRepStr);
//BAIFCCommon.appendToString(elemUnit, "\u22C5", ref negUnitRepStr);
}
}
if (!string.IsNullOrEmpty(negUnitRepStr))
{
unitRepStr += "/" + negUnitRepStr;
}
if (!string.IsNullOrEmpty(unitRepStr))
{
return(true);
}
else
{
return(false);
}
}
