IfcOpenShell/src/ifcgeom/mapping/IfcEllipse.cpp

/********************************************************************************
 *                                                                              *
 * This file is part of IfcOpenShell.                                           *
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 * IfcOpenShell is free software: you can redistribute it and/or modify         *
 * it under the terms of the Lesser GNU General Public License as published by  *
 * the Free Software Foundation, either version 3.0 of the License, or          *
 * (at your option) any later version.                                          *
 *                                                                              *
 * IfcOpenShell is distributed in the hope that it will be useful,              *
 * but WITHOUT ANY WARRANTY; without even the implied warranty of               *
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the                 *
 * Lesser GNU General Public License for more details.                          *
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 * You should have received a copy of the Lesser GNU General Public License     *
 * along with this program. If not, see <http://www.gnu.org/licenses/>.         *
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 ********************************************************************************/

#include "mapping.h"
#define mapping POSTFIX_SCHEMA(mapping)
using namespace ifcopenshell::geometry;

taxonomy::item* mapping::map_impl(const IfcSchema::IfcEllipse* inst) {
	double x = inst->SemiAxis1() * length_unit_;
	double y = inst->SemiAxis2() * length_unit_;
	const double tol = conv_settings_.getValue(ConversionSettings::GV_PRECISION);
	if (x < tol || y < tol) {
		Logger::Message(Logger::LOG_ERROR, "Radius not greater than zero for:", inst);
		return nullptr;
	}

	auto el = new taxonomy::ellipse;
	el->matrix = as<taxonomy::matrix4>(map(inst->Position()));

	// Open Cascade does not allow ellipses of which the minor radius
	// is greater than the major radius. Hence, in this case, the
	// ellipse is rotated. Note that special care is taken
	// when creating a trimmed curve off of an ellipse like this.
	if (y > x) {
		el->matrix.components() <<
			-el->matrix.ccomponents().col(1),
			el->matrix.ccomponents().col(0),
			el->matrix.ccomponents().col(2),
			el->matrix.ccomponents().col(3);
		std::swap(x, y);
	}

	el->radius = x;
	el->radius2 = y;

	return el;
}