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If no plane angle unit is provided in the IFC file, create composite curves using both radians and degrees and see which 'looks best' (=successfully created and/or closed curve)

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Thomas Krijnen
2012-07-29 15:16:30 +00:00
parent 4b2bbc63de
commit 975d0caa0f
1 changed files with 50 additions and 15 deletions
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src/ifcgeom/IfcGeomWires.cpp
+50 -15
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@@ -85,24 +85,59 @@
bool IfcGeom::convert(const Ifc2x3::IfcCompositeCurve::ptr l, TopoDS_Wire& wire) { bool IfcGeom::convert(const Ifc2x3::IfcCompositeCurve::ptr l, TopoDS_Wire& wire) {
if ( ! Ifc::hasPlaneAngleUnit ) { if ( ! Ifc::hasPlaneAngleUnit ) {
Ifc::LogMessage("Warning","Creating a composite curve without unit information:",l->entity); Ifc::LogMessage("Warning","Creating a composite curve without unit information:",l->entity);
Ifc::hasPlaneAngleUnit = true;
// First try radians // Temporarily pretend we do have unit information
Ifc::hasPlaneAngleUnit = true;
bool succes_radians = false;
bool succes_degrees = false;
bool use_radians = false;
bool use_degrees = false;
// First try radians
Ifc::PlaneAngleUnit = 1.0f; Ifc::PlaneAngleUnit = 1.0f;
bool succes_radians = IfcGeom::convert(l,wire); TopoDS_Wire wire_radians, wire_degrees;
bool succes_degrees; try {
if ( succes_radians ) { succes_radians = IfcGeom::convert(l,wire_radians);
} catch (...) {}
// Now try degrees
Ifc::PlaneAngleUnit = 0.0174532925199433f;
try {
succes_degrees = IfcGeom::convert(l,wire_degrees);
} catch (...) {}
// Restore to unknown unit state
Ifc::PlaneAngleUnit = 1.0f;
Ifc::hasPlaneAngleUnit = false;
if ( succes_degrees && ! succes_radians ) {
use_degrees = true;
} else if ( succes_radians && ! succes_degrees ) {
use_radians = true;
} else if ( succes_radians && succes_degrees ) {
if ( wire_degrees.Closed() && ! wire_radians.Closed() ) {
use_degrees = true;
} else if ( wire_radians.Closed() && ! wire_degrees.Closed() ) {
use_radians = true;
} else {
// No heuristic left to prefer the one over the other,
// apparently both variants are equally succesful.
// The curve might be composed of only straight segments.
// Let's go with the wire created using radians as that
// at least is a SI unit.
use_radians = true;
}
}
if ( use_radians ) {
Ifc::LogMessage("Notice","Used radians to create composite curve"); Ifc::LogMessage("Notice","Used radians to create composite curve");
} else { wire = wire_radians;
// Now try degrees } else if ( use_degrees ) {
Ifc::PlaneAngleUnit = 0.0174532925199433f; Ifc::LogMessage("Notice","Used degrees to create composite curve");
succes_degrees = IfcGeom::convert(l,wire); wire = wire_degrees;
if ( succes_degrees ) {
Ifc::LogMessage("Notice","Used degrees to create composite curve");
}
// Restore to radians
Ifc::PlaneAngleUnit = 1.0f;
} }
Ifc::hasPlaneAngleUnit = false;
return succes_radians || succes_degrees; return succes_radians || succes_degrees;
} }
Ifc2x3::IfcCompositeCurveSegment::list segments = l->Segments(); Ifc2x3::IfcCompositeCurveSegment::list segments = l->Segments();