Composite curves

src/ifcgeom/kernels/cgal/CgalIfcGeomWires.cpp

@@ -85,3 +85,93 @@ bool IfcGeom::CgalKernel::convert(const IfcSchema::IfcOrientedEdge* l, cgal_wire
     return false;
   }
 }
+
+bool IfcGeom::CgalKernel::convert(const IfcSchema::IfcCompositeCurve* l, cgal_wire_t& wire) {
+  if ( getValue(GV_PLANEANGLE_UNIT)<0 ) {
+    Logger::Message(Logger::LOG_WARNING,"Creating a composite curve without unit information:",l->entity);
+    
+    // Temporarily pretend we do have unit information
+    setValue(GV_PLANEANGLE_UNIT,1.0);
+    
+    bool succes_radians = false;
+    bool succes_degrees = false;
+    bool use_radians = false;
+    bool use_degrees = false;
+    
+    // First try radians
+    cgal_wire_t wire_radians, wire_degrees;
+    try {
+		    succes_radians = IfcGeom::CgalKernel::convert(l,wire_radians);
+    } catch (...) {}
+    
+    // Now try degrees
+    setValue(GV_PLANEANGLE_UNIT,0.0174532925199433);
+    try {
+		    succes_degrees = IfcGeom::CgalKernel::convert(l,wire_degrees);
+    } catch (...) {}
+    
+    // Restore to unknown unit state
+    setValue(GV_PLANEANGLE_UNIT,-1.0);
+    
+    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.back() == wire_degrees.front() && wire_radians.back() != wire_radians.front() ) {
+        use_degrees = true;
+      } else if ( wire_radians.back() == wire_radians.front() && wire_degrees.back() != wire_degrees.front() ) {
+        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 ) {
+      Logger::Message(Logger::LOG_NOTICE,"Used radians to create composite curve");
+      wire = wire_radians;
+    } else if ( use_degrees ) {
+      Logger::Message(Logger::LOG_NOTICE,"Used degrees to create composite curve");
+      wire = wire_degrees;
+    }
+    
+    return use_radians || use_degrees;
+  }
+  IfcSchema::IfcCompositeCurveSegment::list::ptr segments = l->Segments();
+  cgal_wire_t w;
+  //TopoDS_Vertex last_vertex;
+  for( IfcSchema::IfcCompositeCurveSegment::list::it it = segments->begin(); it != segments->end(); ++ it ) {
+    IfcSchema::IfcCurve* curve = (*it)->ParentCurve();
+    cgal_wire_t wire2;
+    if ( !convert_wire(curve,wire2) ) {
+      Logger::Message(Logger::LOG_ERROR,"Failed to convert curve:",curve->entity);
+      continue;
+    }
+    if ( ! (*it)->SameSense() ) std::reverse(wire2.begin(),wire2.end());
+    
+    if (wire2.empty()) {
+      continue;
+    } else if (w.empty()) {
+      w = wire2;
+    } else if (w.back() == w.front()) {
+      std::vector<Kernel::Point_3>::const_iterator vertex = wire2.begin();
+      ++vertex;
+      while (vertex != wire2.end()) {
+        w.push_back(*vertex);
+        ++vertex;
+      }
+    } else {
+      for (auto &vertex: wire2) w.push_back(vertex);
+    }
+  }
+  
+  remove_duplicate_points_from_loop(w, false);
+  
+  wire = w;
+  return true;
+}