// Format an IFC attribute and maybe returns as string. Only literal scalar
// values are converted. Things like entity instances and lists are omitted.
boost::optional<std::string> format_attribute(const Argument* argument, IfcUtil::ArgumentType argument_type) {
boost::optional<std::string> value;
switch(argument_type) {
case IfcUtil::Argument_BOOL: {
const bool b = *argument;
value = b ? "true" : "false";
break; }
case IfcUtil::Argument_DOUBLE: {
const double d = *argument;
std::stringstream stream;
stream << d;
value = stream.str();
break; }
case IfcUtil::Argument_STRING:
case IfcUtil::Argument_ENUMERATION: {
value = static_cast<std::string>(*argument);
break; }
case IfcUtil::Argument_INT: {
const int v = *argument;
std::stringstream stream;
stream << v;
value = stream.str();
break; }
case IfcUtil::Argument_ENTITY_INSTANCE: {
IfcUtil::IfcBaseClass* e = *argument;
if (Type::IsSimple(e->type())) {
IfcUtil::IfcBaseType* f = (IfcUtil::IfcBaseType*) e;
value = format_attribute(f->getArgument(0), f->getArgumentType(0));
} else if (e->is(IfcSchema::Type::IfcSIUnit) || e->is(IfcSchema::Type::IfcConversionBasedUnit)) {
// Some string concatenation to have a unit name as a XML attribute.
std::string unit_name;
if (e->is(IfcSchema::Type::IfcSIUnit)) {
IfcSchema::IfcSIUnit* unit = (IfcSchema::IfcSIUnit*) e;
unit_name = IfcSchema::IfcSIUnitName::ToString(unit->Name());
if (unit->hasPrefix()) {
unit_name = IfcSchema::IfcSIPrefix::ToString(unit->Prefix()) + unit_name;
}
} else {
IfcSchema::IfcConversionBasedUnit* unit = (IfcSchema::IfcConversionBasedUnit*) e;
unit_name = unit->Name();
}
// TODO add toLower() and toUpper() string helper functions for the project
std::transform(unit_name.begin(), unit_name.end(), unit_name.begin(), ::tolower);
value = unit_name;
}
break; }
}
return value;
}
bool IfcGeom::Kernel::convert(const IfcSchema::IfcTrimmedCurve* l, TopoDS_Wire& wire) {
IfcSchema::IfcCurve* basis_curve = l->BasisCurve();
bool isConic = basis_curve->is(IfcSchema::Type::IfcConic);
double parameterFactor = isConic ? getValue(GV_PLANEANGLE_UNIT) : getValue(GV_LENGTH_UNIT);
Handle(Geom_Curve) curve;
if ( !convert_curve(basis_curve,curve) ) return false;
bool trim_cartesian = l->MasterRepresentation() == IfcSchema::IfcTrimmingPreference::IfcTrimmingPreference_CARTESIAN;
IfcEntityList::ptr trims1 = l->Trim1();
IfcEntityList::ptr trims2 = l->Trim2();
bool trimmed1 = false;
bool trimmed2 = false;
unsigned sense_agreement = l->SenseAgreement() ? 0 : 1;
double flts[2];
gp_Pnt pnts[2];
bool has_flts[2] = {false,false};
bool has_pnts[2] = {false,false};
BRepBuilderAPI_MakeWire w;
for ( IfcEntityList::it it = trims1->begin(); it != trims1->end(); it ++ ) {
IfcUtil::IfcBaseClass* i = *it;
if ( i->is(IfcSchema::Type::IfcCartesianPoint) ) {
IfcGeom::Kernel::convert((IfcSchema::IfcCartesianPoint*)i, pnts[sense_agreement] );
has_pnts[sense_agreement] = true;
} else if ( i->is(IfcSchema::Type::IfcParameterValue) ) {
const double value = *((IfcSchema::IfcParameterValue*)i);
flts[sense_agreement] = value * parameterFactor;
has_flts[sense_agreement] = true;
}
}
for ( IfcEntityList::it it = trims2->begin(); it != trims2->end(); it ++ ) {
IfcUtil::IfcBaseClass* i = *it;
if ( i->is(IfcSchema::Type::IfcCartesianPoint) ) {
IfcGeom::Kernel::convert((IfcSchema::IfcCartesianPoint*)i, pnts[1-sense_agreement] );
has_pnts[1-sense_agreement] = true;
} else if ( i->is(IfcSchema::Type::IfcParameterValue) ) {
const double value = *((IfcSchema::IfcParameterValue*)i);
flts[1-sense_agreement] = value * parameterFactor;
has_flts[1-sense_agreement] = true;
}
}
trim_cartesian &= has_pnts[0] && has_pnts[1];
bool trim_cartesian_failed = !trim_cartesian;
if ( trim_cartesian ) {
if ( pnts[0].Distance(pnts[1]) < getValue(GV_WIRE_CREATION_TOLERANCE) ) {
Logger::Message(Logger::LOG_WARNING,"Skipping segment with length below tolerance level:",l->entity);
return false;
}
ShapeFix_ShapeTolerance FTol;
TopoDS_Vertex v1 = BRepBuilderAPI_MakeVertex(pnts[0]);
TopoDS_Vertex v2 = BRepBuilderAPI_MakeVertex(pnts[1]);
FTol.SetTolerance(v1, getValue(GV_WIRE_CREATION_TOLERANCE), TopAbs_VERTEX);
FTol.SetTolerance(v2, getValue(GV_WIRE_CREATION_TOLERANCE), TopAbs_VERTEX);
BRepBuilderAPI_MakeEdge e (curve,v1,v2);
if ( ! e.IsDone() ) {
BRepBuilderAPI_EdgeError err = e.Error();
if ( err == BRepBuilderAPI_PointProjectionFailed ) {
Logger::Message(Logger::LOG_WARNING,"Point projection failed for:",l->entity);
trim_cartesian_failed = true;
}
} else {
w.Add(e.Edge());
}
}
if ( (!trim_cartesian || trim_cartesian_failed) && (has_flts[0] && has_flts[1]) ) {
// The Geom_Line is constructed from a gp_Pnt and gp_Dir, whereas the IfcLine
// is defined by an IfcCartesianPoint and an IfcVector with Magnitude. Because
// the vector is normalised when passed to Geom_Line constructor the magnitude
// needs to be factored in with the IfcParameterValue here.
if ( basis_curve->is(IfcSchema::Type::IfcLine) ) {
IfcSchema::IfcLine* line = static_cast<IfcSchema::IfcLine*>(basis_curve);
const double magnitude = line->Dir()->Magnitude();
flts[0] *= magnitude; flts[1] *= magnitude;
}
if ( basis_curve->is(IfcSchema::Type::IfcEllipse) ) {
IfcSchema::IfcEllipse* ellipse = static_cast<IfcSchema::IfcEllipse*>(basis_curve);
double x = ellipse->SemiAxis1() * getValue(GV_LENGTH_UNIT);
double y = ellipse->SemiAxis2() * getValue(GV_LENGTH_UNIT);
const bool rotated = y > x;
if (rotated) {
flts[0] -= M_PI / 2.;
flts[1] -= M_PI / 2.;
}
}
if ( isConic && ALMOST_THE_SAME(fmod(flts[1]-flts[0],(double)(M_PI*2.0)),0.0f) ) {
w.Add(BRepBuilderAPI_MakeEdge(curve));
} else {
BRepBuilderAPI_MakeEdge e (curve,flts[0],flts[1]);
w.Add(e.Edge());
}
} else if ( trim_cartesian_failed && (has_pnts[0] && has_pnts[1]) ) {
w.Add(BRepBuilderAPI_MakeEdge(pnts[0],pnts[1]));
}
if ( w.IsDone() ) {
wire = w.Wire();
return true;
} else {
return false;
}
}