IfcOpenShell/src/ifcgeom/mapping/IfcPolyLoop.cpp

/********************************************************************************
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 * This file is part of IfcOpenShell.                                           *
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#include "mapping.h"
#define mapping POSTFIX_SCHEMA(mapping)
using namespace ifcopenshell::geometry;

#include "../profile_helper.h"

taxonomy::ptr mapping::map_impl(const IfcSchema::IfcPolyLoop* inst) {
	IfcSchema::IfcCartesianPoint::list::ptr points = inst->Polygon();

	// Parse and store the points in a sequence
	std::vector<taxonomy::point3::ptr> polygon;
	polygon.reserve(points->size());
	std::transform(points->begin(), points->end(), std::back_inserter(polygon), [this](const IfcSchema::IfcCartesianPoint* p) {
		return taxonomy::cast<taxonomy::point3>(map(p));
	});

	// A loop should consist of at least three vertices
	int original_count = polygon.size();
	if (original_count < 3) {
		logger_.Message(Logger::LOG_WARNING, "GEO", 278, "Not enough edges for:", inst);
		return nullptr;
	}

	// @todo Remove points that are too close to one another
	const double eps = settings_.get<settings::Precision>().get();
	auto previous_size = polygon.size();
	remove_duplicate_points_from_loop(polygon, true, eps);
	if (polygon.size() != previous_size) {
		logger_.Warning("GEO", 279, "Removed " + std::to_string(previous_size - polygon.size()) + " (near) duplicate points from:", inst);
	}

	int count = polygon.size();
	if (original_count - count != 0) {
		std::stringstream ss; ss << (original_count - count) << " edges removed for:"; 
		logger_.Message(Logger::LOG_WARNING, "GEO", 280, ss.str(), inst);
	}

	if (count < 3) {
		logger_.Message(Logger::LOG_WARNING, "GEO", 281, "Not enough edges for:", inst);
		return nullptr;
	}

	// Contrary to polyline the loop is implicitly closed
	polygon.push_back(polygon.front());

	return polygon_from_points(polygon);
}