/********************************************************************************

* *

* This file is part of IfcOpenShell. *

* *

* 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. *

* *

* 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/>. *

* *

********************************************************************************/

/********************************************************************************

* *

* Implements convenience functions for alignments *

* *

********************************************************************************/

#include "alignment_helper.h"

#include <boost/math/constants/constants.hpp>

// @todo use std::numbers::pi when upgrading to C++ 20

static const double PI = boost::math::constants::pi<double>();

#include <boost/math/quadrature/trapezoidal.hpp>

#ifdef HAS_SCHEMA_4x3_add2

// sets the segment name like ("H1" for horizontal, "V1" for vertical, "C1" for cant)

void _name_segments(const char* prefix, std::vector<Ifc4x3_add2::IfcObjectDefinition>& segments) {

unsigned idx = 1;

for (auto& segment : segments) {

std::ostringstream os;

os << prefix << idx++;

segment.setName(os.str());

}

}

// creates representations for each IfcAlignmentSegment per CT 4.1.7.1.1.4

// https://standards.buildingsmart.org/IFC/RELEASE/IFC4_3/HTML/concepts/Product_Shape/Product_Geometric_Representation/Alignment_Geometry/Alignment_Geometry_-_Segments/content.html

void _createSegmentRepresentations(hierarchy_helper<Ifc4x3_add2>& file, Ifc4x3_add2::IfcLocalPlacement global_placement, Ifc4x3_add2::IfcGeometricRepresentationSubContext segment_axis_subcontext, std::vector<Ifc4x3_add2::IfcSegment>& curve_segments, std::vector<Ifc4x3_add2::IfcObjectDefinition>& segments) {

auto cs_iter = curve_segments.begin();

auto s_iter = segments.begin();

for (; cs_iter != curve_segments.end(); cs_iter++, s_iter++) {

auto curve_segment = *cs_iter;

auto alignment_segment = (s_iter)->as<Ifc4x3_add2::IfcAlignmentSegment>();

auto axis_representation = file.create<Ifc4x3_add2::IfcShapeRepresentation>();

axis_representation.setContextOfItems(segment_axis_subcontext);

axis_representation.setRepresentationIdentifier("Axis");

axis_representation.setRepresentationType("Segment");

axis_representation.setItems(std::vector<Ifc4x3_add2::IfcRepresentationItem>{curve_segment});

auto product = file.create<Ifc4x3_add2::IfcProductDefinitionShape>();

product.setRepresentations(std::vector<Ifc4x3_add2::IfcRepresentation>{axis_representation});

alignment_segment.setObjectPlacement(global_placement);

alignment_segment.setRepresentation(product);

}

}

// creates a horizontal alignment using a vector of PI points and curve radii

// returns a list of object definitions, curve segments, and a composite curve

std::tuple<std::vector<Ifc4x3_add2::IfcObjectDefinition>, std::vector<Ifc4x3_add2::IfcSegment>, Ifc4x3_add2::IfcCompositeCurve> _createHorizontalAlignment(hierarchy_helper<Ifc4x3_add2>& file, const std::vector<std::pair<double, double>>& points, const std::vector<double>& radii,bool include_geometry) {

std::vector<Ifc4x3_add2::IfcObjectDefinition> horizontal_segments; // business logic

std::vector<Ifc4x3_add2::IfcSegment> horizontal_curve_segments; // geometry

auto point_iter = points.begin();

double xBT, yBT, xPI, yPI;

boost::tie(xBT, yBT) = *point_iter;

point_iter++;

boost::tie(xPI, yPI) = *point_iter;

double xFT, yFT;

for (auto radius : radii) {

// back tangent

auto dxBT = xPI - xBT;

auto dyBT = yPI - yBT;

auto angleBT = atan2(dyBT, dxBT);

auto lengthBT = sqrt(dxBT * dxBT + dyBT * dyBT);

// forward tangent

point_iter++;

std::tie(xFT, yFT) = *point_iter;

auto dxFT = xFT - xPI;

auto dyFT = yFT - yPI;

auto angleFT = atan2(dyFT, dxFT);

auto delta = angleFT - angleBT;

auto tangent = fabs(radius * tan(delta / 2));

auto lc = fabs(radius * delta);

radius *= delta / fabs(delta);

auto xPC = xPI - tangent * cos(angleBT);

auto yPC = yPI - tangent * sin(angleBT);

auto xPT = xPI + tangent * cos(angleFT);

auto yPT = yPI + tangent * sin(angleFT);

auto tangent_run = lengthBT - tangent;

// create back tangent run

{

auto pt = file.addDoublet<Ifc4x3_add2::IfcCartesianPoint>(xBT, yBT);

auto design_parameters = file.create<Ifc4x3_add2::IfcAlignmentHorizontalSegment>();

design_parameters.setStartPoint(pt);

design_parameters.setStartDirection(angleBT);

design_parameters.setStartRadiusOfCurvature(0.0);

design_parameters.setEndRadiusOfCurvature(0.0);

design_parameters.setSegmentLength(tangent_run);

design_parameters.setPredefinedType(Ifc4x3_add2::IfcAlignmentHorizontalSegmentTypeEnum::IfcAlignmentHorizontalSegmentType_LINE);

auto alignment_segment = file.create<Ifc4x3_add2::IfcAlignmentSegment>();

alignment_segment.setGlobalId(ifcopenshell::global_id());

alignment_segment.setDesignParameters(design_parameters);

horizontal_segments.push_back(alignment_segment);

if (include_geometry) {

horizontal_curve_segments.push_back(mapAlignmentHorizontalSegment(file, design_parameters).first);

}

}

// create circular curve

{

auto pc = file.addDoublet<Ifc4x3_add2::IfcCartesianPoint>(xPC, yPC);

auto design_parameters = file.create<Ifc4x3_add2::IfcAlignmentHorizontalSegment>();

design_parameters.setStartPoint(pc);

design_parameters.setStartDirection(angleBT);

design_parameters.setStartRadiusOfCurvature(radius);

design_parameters.setEndRadiusOfCurvature(radius);

design_parameters.setSegmentLength(lc);

design_parameters.setPredefinedType(Ifc4x3_add2::IfcAlignmentHorizontalSegmentTypeEnum::IfcAlignmentHorizontalSegmentType_CIRCULARARC);

auto alignment_segment = file.create<Ifc4x3_add2::IfcAlignmentSegment>();

alignment_segment.setGlobalId(ifcopenshell::global_id());

alignment_segment.setDesignParameters(design_parameters);

horizontal_segments.push_back(alignment_segment);

if (include_geometry) {

horizontal_curve_segments.push_back(mapAlignmentHorizontalSegment(file, design_parameters).first);

}

}

xBT = xPT;

yBT = yPT;

xPI = xFT;

yPI = yFT;

}

// create last tangent run

auto dx = xPI - xBT;

auto dy = yPI - yBT;

auto angleBT = atan2(dy, dx);

auto tangent_run = sqrt(dx * dx + dy * dy);

auto pt = file.addDoublet<Ifc4x3_add2::IfcCartesianPoint>(xBT, yBT);

auto design_parameters = file.create<Ifc4x3_add2::IfcAlignmentHorizontalSegment>();

design_parameters.setStartPoint(pt);

design_parameters.setStartDirection(angleBT);

design_parameters.setStartRadiusOfCurvature(0);

design_parameters.setEndRadiusOfCurvature(0);

design_parameters.setSegmentLength(tangent_run);

design_parameters.setPredefinedType(Ifc4x3_add2::IfcAlignmentHorizontalSegmentTypeEnum::IfcAlignmentHorizontalSegmentType_LINE);

auto alignment_segment = file.create<Ifc4x3_add2::IfcAlignmentSegment>();

alignment_segment.setGlobalId(ifcopenshell::global_id());

alignment_segment.setDesignParameters(design_parameters);

horizontal_segments.push_back(alignment_segment);

if (include_geometry) {

horizontal_curve_segments.push_back(mapAlignmentHorizontalSegment(file, design_parameters).first);

}

// create zero length terminator segment

auto poe = file.addDoublet<Ifc4x3_add2::IfcCartesianPoint>(xPI, yPI);

design_parameters = file.create<Ifc4x3_add2::IfcAlignmentHorizontalSegment>();

design_parameters.setStartPoint(poe);

design_parameters.setStartDirection(angleBT);

design_parameters.setStartRadiusOfCurvature(0);

design_parameters.setEndRadiusOfCurvature(0);

design_parameters.setSegmentLength(0.0);

design_parameters.setPredefinedType(Ifc4x3_add2::IfcAlignmentHorizontalSegmentTypeEnum::IfcAlignmentHorizontalSegmentType_LINE);

alignment_segment = file.create<Ifc4x3_add2::IfcAlignmentSegment>();

alignment_segment.setGlobalId(ifcopenshell::global_id());

alignment_segment.setDesignParameters(design_parameters);

horizontal_segments.push_back(alignment_segment);

if (include_geometry) {

auto segment = mapAlignmentHorizontalSegment(file, design_parameters).first;

segment.setTransition(Ifc4x3_add2::IfcTransitionCode::IfcTransitionCode_DISCONTINUOUS);

horizontal_curve_segments.push_back(segment);

}

Ifc4x3_add2::IfcCompositeCurve composite_curve;

if (include_geometry) {

composite_curve = file.create<Ifc4x3_add2::IfcCompositeCurve>();

composite_curve.setSegments(horizontal_curve_segments);

composite_curve.setSelfIntersect(false);

}

return {horizontal_segments, horizontal_curve_segments, composite_curve};

}

Ifc4x3_add2::IfcAlignment addHorizontalAlignment(hierarchy_helper<Ifc4x3_add2>& file, const std::string& alignment_name, const std::vector<std::pair<double, double>>& points, const std::vector<double>& radii,bool include_geometry) {

auto [horizontal_segments, horizontal_curve_segments, composite_curve] = _createHorizontalAlignment(file, points, radii, include_geometry);

_name_segments("H", horizontal_segments);

//

// Create the horizontal alignment (IfcAlignmentHorizontal) and nest alignment segments

//

auto horizontal_alignment = file.create<Ifc4x3_add2::IfcAlignmentHorizontal>();

horizontal_alignment.setGlobalId(ifcopenshell::global_id());

horizontal_alignment.setName(alignment_name + " - Horizontal");

auto nests_horizontal_segments = file.create<Ifc4x3_add2::IfcRelNests>();

nests_horizontal_segments.setGlobalId(ifcopenshell::global_id());

nests_horizontal_segments.setName("Nests horizontal alignment segments with horizontal alignment");

nests_horizontal_segments.setRelatingObject(horizontal_alignment);

nests_horizontal_segments.setRelatedObjects(horizontal_segments);

//

// Create geometric representation

//

Ifc4x3_add2::IfcLocalPlacement placement;

Ifc4x3_add2::IfcProductDefinitionShape product_definition_shape;

if (include_geometry) {

// create the footprint representation

auto axis_model_representation_subcontext = file.getRepresentationSubContext("Axis", "Model");

auto footprint_shape_representation = file.create<Ifc4x3_add2::IfcShapeRepresentation>();

footprint_shape_representation.setContextOfItems(axis_model_representation_subcontext);

footprint_shape_representation.setRepresentationIdentifier("FootPrint");

footprint_shape_representation.setRepresentationType("Curve2D");

footprint_shape_representation.setItems(std::vector<Ifc4x3_add2::IfcRepresentationItem>{composite_curve});

placement = file.addLocalPlacement();

// the alignment has a plan view footprint representation

// create the alignment product definition

product_definition_shape = file.create<Ifc4x3_add2::IfcProductDefinitionShape>();

product_definition_shape.setName("Alignment Product Definition Shape");

product_definition_shape.setRepresentations(std::vector<Ifc4x3_add2::IfcRepresentation>{footprint_shape_representation});

// create representations for each segment

_createSegmentRepresentations(file, placement, axis_model_representation_subcontext, horizontal_curve_segments, horizontal_segments);

}

// create the alignment

auto alignment = file.create<Ifc4x3_add2::IfcAlignment>();

alignment.setGlobalId(ifcopenshell::global_id());

alignment.setName(alignment_name);

alignment.setObjectPlacement(placement);

alignment.setRepresentation(product_definition_shape);

return alignment;

}

std::tuple<typename std::vector<Ifc4x3_add2::IfcObjectDefinition>&, typename std::vector<Ifc4x3_add2::IfcSegment>&, Ifc4x3_add2::IfcGradientCurve> _createVerticalAlignment(hierarchy_helper<Ifc4x3_add2>& file, Ifc4x3_add2::IfcCompositeCurve composite_curve,const std::vector<std::pair<double, double>>& vpoints, const std::vector<double>& vclengths, bool include_geometry) {

std::vector<Ifc4x3_add2::IfcObjectDefinition> vertical_segments; // business logic

std::vector<Ifc4x3_add2::IfcSegment> vertical_curve_segments; // geometry

auto point_iter = vpoints.begin();

double xPBG, yPBG, xPVI, yPVI;

boost::tie(xPBG, yPBG) = *point_iter;

point_iter++;

boost::tie(xPVI, yPVI) = *point_iter;

double xPFG, yPFG;

for (auto length : vclengths) {

// back gradient

auto dxBG = xPVI - xPBG;

auto dyBG = yPVI - yPBG;

auto start_slope = tan(atan2(dyBG,dxBG));

// forward gradient

point_iter++;

std::tie(xPFG, yPFG) = *point_iter;

auto dxFG = xPFG - xPVI;

auto dyFG = yPFG - yPVI;

auto end_slope = tan(atan2(dyFG,dxFG));

double xEVC = xPVI + length / 2;

double yEVC = yPVI + end_slope * length / 2;

// create gradient

{

auto gradient_length = dxBG - length/2;

auto design_parameters = file.create<Ifc4x3_add2::IfcAlignmentVerticalSegment>();

design_parameters.setStartDistAlong(xPBG);

design_parameters.setHorizontalLength(gradient_length);

design_parameters.setStartHeight(yPBG);

design_parameters.setStartGradient(start_slope);

design_parameters.setEndGradient(start_slope);

design_parameters.setPredefinedType(Ifc4x3_add2::IfcAlignmentVerticalSegmentTypeEnum::IfcAlignmentVerticalSegmentType_CONSTANTGRADIENT);

auto alignment_segment = file.create<Ifc4x3_add2::IfcAlignmentSegment>();

alignment_segment.setGlobalId(ifcopenshell::global_id());

alignment_segment.setDesignParameters(design_parameters);

vertical_segments.push_back(alignment_segment);

if (include_geometry) {

vertical_curve_segments.push_back(mapAlignmentVerticalSegment(file, design_parameters).first);

}

}

// create vertical curve

{

double k = (end_slope - start_slope) / length;

double xBVC = xPVI - length / 2;

double yBVC = yPVI - start_slope * length / 2;

auto design_parameters = file.create<Ifc4x3_add2::IfcAlignmentVerticalSegment>();

design_parameters.setStartDistAlong(xBVC);

design_parameters.setHorizontalLength(length);

design_parameters.setStartHeight(yBVC);

design_parameters.setStartGradient(start_slope);

design_parameters.setEndGradient(end_slope);

design_parameters.setRadiusOfCurvature(1/k);

design_parameters.setPredefinedType(Ifc4x3_add2::IfcAlignmentVerticalSegmentTypeEnum::IfcAlignmentVerticalSegmentType_PARABOLICARC);

auto alignment_segment = file.create<Ifc4x3_add2::IfcAlignmentSegment>();

alignment_segment.setGlobalId(ifcopenshell::global_id());

alignment_segment.setDesignParameters(design_parameters);

vertical_segments.push_back(alignment_segment);

if (include_geometry) {

vertical_curve_segments.push_back(mapAlignmentVerticalSegment(file, design_parameters).first);

}

}

xPBG = xEVC;

yPBG = yEVC;

xPVI = xPFG;

yPVI = yPFG;

}

// create last tangent run

auto dx = xPVI - xPBG;

auto dy = yPVI - yPBG;

auto slope = tan(atan2(dy,dx));

auto gradient_length = dx;

auto design_parameters = file.create<Ifc4x3_add2::IfcAlignmentVerticalSegment>();

design_parameters.setStartDistAlong(xPBG);

design_parameters.setHorizontalLength(gradient_length);

design_parameters.setStartHeight(yPBG);

design_parameters.setStartGradient(slope);

design_parameters.setEndGradient(slope);

design_parameters.setPredefinedType(Ifc4x3_add2::IfcAlignmentVerticalSegmentTypeEnum::IfcAlignmentVerticalSegmentType_CONSTANTGRADIENT);

auto alignment_segment = file.create<Ifc4x3_add2::IfcAlignmentSegment>();

alignment_segment.setGlobalId(ifcopenshell::global_id());

alignment_segment.setDesignParameters(design_parameters);

vertical_segments.push_back(alignment_segment);

if (include_geometry) {

vertical_curve_segments.push_back(mapAlignmentVerticalSegment(file, design_parameters).first);

}

// create zero length terminator segment

design_parameters = file.create<Ifc4x3_add2::IfcAlignmentVerticalSegment>();

design_parameters.setStartDistAlong(xPVI);

design_parameters.setHorizontalLength(0.);

design_parameters.setStartHeight(yPVI);

design_parameters.setStartGradient(slope);

design_parameters.setEndGradient(slope);

design_parameters.setPredefinedType(Ifc4x3_add2::IfcAlignmentVerticalSegmentTypeEnum::IfcAlignmentVerticalSegmentType_CONSTANTGRADIENT);

alignment_segment = file.create<Ifc4x3_add2::IfcAlignmentSegment>();

alignment_segment.setGlobalId(ifcopenshell::global_id());

alignment_segment.setDesignParameters(design_parameters);

vertical_segments.push_back(alignment_segment);

if (include_geometry) {

auto segment = mapAlignmentVerticalSegment(file, design_parameters).first;

segment.setTransition(Ifc4x3_add2::IfcTransitionCode::IfcTransitionCode_DISCONTINUOUS);

vertical_curve_segments.push_back(segment);

}

Ifc4x3_add2::IfcGradientCurve gradient_curve;

if (include_geometry) {

gradient_curve = file.create<Ifc4x3_add2::IfcGradientCurve>();

gradient_curve.setSegments(vertical_curve_segments);

gradient_curve.setSelfIntersect(false);

gradient_curve.setBaseCurve(composite_curve);

}

return {vertical_segments, vertical_curve_segments, gradient_curve};

}

Ifc4x3_add2::IfcAlignment addAlignment(hierarchy_helper<Ifc4x3_add2>& file, const std::string& alignment_name, const std::vector<std::pair<double, double>>& points, const std::vector<double>& radii, const std::vector<std::pair<double, double>>& vpoints, const std::vector<double>& vclengths,bool include_geometry) {

auto [horizontal_segments, horizontal_curve_segments, composite_curve] = _createHorizontalAlignment(file, points, radii, include_geometry);

auto [vertical_segments, vertical_curve_segments, gradient_curve] = _createVerticalAlignment(file, composite_curve, vpoints, vclengths, include_geometry);

_name_segments("H", horizontal_segments);

_name_segments("V", vertical_segments);

//

// Create the horizontal alignment (IfcAlignmentHorizontal) and nest the segments

//

auto horizontal_alignment = file.create<Ifc4x3_add2::IfcAlignmentHorizontal>();

horizontal_alignment.setGlobalId(ifcopenshell::global_id());

horizontal_alignment.setName(alignment_name + " - Horizontal");

auto nests_horizontal_segments = file.create<Ifc4x3_add2::IfcRelNests>();

nests_horizontal_segments.setGlobalId(ifcopenshell::global_id());

nests_horizontal_segments.setName("Nests horizontal alignment segments with horizontal alignment");

nests_horizontal_segments.setRelatingObject(horizontal_alignment);

nests_horizontal_segments.setRelatedObjects(horizontal_segments);

//

// Create the vertical alignment (IfcAlignmentVertical) and nest the segments

//

auto vertical_profile = file.create<Ifc4x3_add2::IfcAlignmentVertical>();

vertical_profile.setGlobalId(ifcopenshell::global_id());

vertical_profile.setName(alignment_name + "- Vertical");

auto nests_vertical_segments = file.create<Ifc4x3_add2::IfcRelNests>();

nests_vertical_segments.setGlobalId(ifcopenshell::global_id());

nests_vertical_segments.setName("Nests vertical alignment segments with vertical alignment");

nests_vertical_segments.setRelatingObject(vertical_profile);

nests_vertical_segments.setRelatedObjects(vertical_segments);

Ifc4x3_add2::IfcLocalPlacement placement;

Ifc4x3_add2::IfcProductDefinitionShape product_definition_shape;

if (include_geometry) {

auto axis_model_representation_subcontext = file.getRepresentationSubContext("Axis", "Model");

// create footprint representation

auto footprint_shape_representation = file.create<Ifc4x3_add2::IfcShapeRepresentation>();

footprint_shape_representation.setContextOfItems(axis_model_representation_subcontext);

footprint_shape_representation.setRepresentationIdentifier("FootPrint");

footprint_shape_representation.setRepresentationType("Curve2D");

footprint_shape_representation.setItems(std::vector<Ifc4x3_add2::IfcRepresentationItem>{composite_curve});

// create the axis representation

auto axis3d_shape_representation = file.create<Ifc4x3_add2::IfcShapeRepresentation>();

axis3d_shape_representation.setContextOfItems(axis_model_representation_subcontext);

axis3d_shape_representation.setRepresentationIdentifier("Axis");

axis3d_shape_representation.setRepresentationType("Curve3D");

axis3d_shape_representation.setItems(std::vector<Ifc4x3_add2::IfcRepresentationItem>{gradient_curve});

// create axis representations for each segment

placement = file.addLocalPlacement();

_createSegmentRepresentations(file, placement, axis_model_representation_subcontext, horizontal_curve_segments, horizontal_segments);

_createSegmentRepresentations(file, placement, axis_model_representation_subcontext, vertical_curve_segments, vertical_segments);

// the alignment has a 3d curve representation

// create the alignment product definition

product_definition_shape = file.create<Ifc4x3_add2::IfcProductDefinitionShape>();

product_definition_shape.setName("Alignment Product Definition Shape");

product_definition_shape.setRepresentations(std::vector<Ifc4x3_add2::IfcRepresentation>{footprint_shape_representation, axis3d_shape_representation});

}

//

// Create the IfcAlignment

//

auto alignment = file.create<Ifc4x3_add2::IfcAlignment>();

alignment.setGlobalId(ifcopenshell::global_id());

alignment.setName(alignment_name);

alignment.setObjectPlacement(placement);

alignment.setRepresentation(product_definition_shape);

// Nest the IfcAlignmentHorizontal and IfcAlignmentVertical with the IfcAlignment to complete the business logic

// 4.1.4.4.1 Alignments nest horizontal and vertical layouts

// https://standards.buildingsmart.org/IFC/RELEASE/IFC4_3/HTML/concepts/Object_Composition/Nesting/Alignment_Layouts/content.html

auto nests_alignment_layouts = file.create<Ifc4x3_add2::IfcRelNests>();

nests_alignment_layouts.setGlobalId(ifcopenshell::global_id());

nests_alignment_layouts.setName("Nest horizontal and vertical alignment layouts with the alignment");

nests_alignment_layouts.setRelatingObject(alignment);

nests_alignment_layouts.setRelatedObjects(std::vector<Ifc4x3_add2::IfcObjectDefinition>{horizontal_alignment, vertical_profile});

return alignment;

}

std::pair<Ifc4x3_add2::IfcCurveSegment, Ifc4x3_add2::IfcCurveSegment> mapAlignmentSegment(hierarchy_helper<Ifc4x3_add2>& file, const Ifc4x3_add2::IfcAlignmentSegment& segment) {

std::pair<Ifc4x3_add2::IfcCurveSegment, Ifc4x3_add2::IfcCurveSegment> result;

auto design_parameters = segment.DesignParameters();

auto horizontal = design_parameters.as<Ifc4x3_add2::IfcAlignmentHorizontalSegment>();

auto vertical = design_parameters.as<Ifc4x3_add2::IfcAlignmentVerticalSegment>();

auto cant = design_parameters.as<Ifc4x3_add2::IfcAlignmentCantSegment>();

if (horizontal) {

result = mapAlignmentHorizontalSegment(file, horizontal);

} else if (vertical) {

result = mapAlignmentVerticalSegment(file, vertical);

} else if (cant) {

result = mapAlignmentCantSegment(file, cant);

} else {

logger::error(std::string("Unexpected IfcAlignmentSegment subtype encountered"));

}

return result;

}

namespace {

Ifc4x3_add2::IfcLengthMeasure create_length(hierarchy_helper<Ifc4x3_add2>& file, double d) {

auto inst = file.create<Ifc4x3_add2::IfcLengthMeasure>();

inst.set_attribute_value(0, d);

return inst;

}

}

std::pair<Ifc4x3_add2::IfcCurveSegment, Ifc4x3_add2::IfcCurveSegment> mapAlignmentHorizontalSegment(hierarchy_helper<Ifc4x3_add2>& file, const Ifc4x3_add2::IfcAlignmentHorizontalSegment& segment) {

std::pair<Ifc4x3_add2::IfcCurveSegment, Ifc4x3_add2::IfcCurveSegment> result;

auto start_point = segment.StartPoint();

auto start_direction = segment.StartDirection();

auto start_radius = segment.StartRadiusOfCurvature();

auto end_radius = segment.EndRadiusOfCurvature();

auto length = segment.SegmentLength();

auto type = segment.PredefinedType();

double f = (end_radius ? length / end_radius : 0.0) - (start_radius ? length / start_radius : 0.0);

if (type == Ifc4x3_add2::IfcAlignmentHorizontalSegmentTypeEnum::IfcAlignmentHorizontalSegmentType_LINE) {

auto parent_curve = file.create<Ifc4x3_add2::IfcLine>();

parent_curve.setPnt(file.addDoublet<Ifc4x3_add2::IfcCartesianPoint>(0.0, 0.0));

auto vec = file.create<Ifc4x3_add2::IfcVector>();

vec.setOrientation(file.addDoublet<Ifc4x3_add2::IfcDirection>(1.0, 0.0));

vec.setMagnitude(1.);

parent_curve.setDir(vec);

auto curve_segment = file.create<Ifc4x3_add2::IfcCurveSegment>();

curve_segment.setTransition(Ifc4x3_add2::IfcTransitionCode::IfcTransitionCode_CONTSAMEGRADIENT);

curve_segment.setPlacement(file.addPlacement2d(start_point.Coordinates()[0], start_point.Coordinates()[1], cos(start_direction), sin(start_direction)));

curve_segment.setSegmentLength(create_length(file, 0.0));

curve_segment.setSegmentLength(create_length(file, length));

curve_segment.setParentCurve(parent_curve);

result.first = curve_segment;

} else if (type == Ifc4x3_add2::IfcAlignmentHorizontalSegmentTypeEnum::IfcAlignmentHorizontalSegmentType_CIRCULARARC) {

auto parent_curve = file.create<Ifc4x3_add2::IfcCircle>();

parent_curve.setPosition(file.addPlacement2d(0., 0., 1.0, 0.));

parent_curve.setRadius(std::fabs(start_radius));

auto curve_segment = file.create<Ifc4x3_add2::IfcCurveSegment>();

curve_segment.setTransition(Ifc4x3_add2::IfcTransitionCode::IfcTransitionCode_CONTSAMEGRADIENT);

curve_segment.setPlacement(file.addPlacement2d(start_point.Coordinates()[0], start_point.Coordinates()[1], cos(start_direction), sin(start_direction)));

curve_segment.setSegmentLength(create_length(file, 0.0));

curve_segment.setSegmentLength(create_length(file, length * start_radius / std::fabs(start_radius)));

curve_segment.setParentCurve(parent_curve);

result.first = curve_segment;

} else if (type == Ifc4x3_add2::IfcAlignmentHorizontalSegmentTypeEnum::IfcAlignmentHorizontalSegmentType_CLOTHOID) {

double A = length / sqrt(fabs(f)) * f / fabs(f);

auto parent_curve = file.create<Ifc4x3_add2::IfcClothoid>();

parent_curve.setPosition(file.addPlacement2d(0., 0., 1.0, 0.));

parent_curve.setClothoidConstant(A);

double offset;

if ((fabs(start_radius) < fabs(end_radius) && start_radius) || end_radius == 0.) {

offset = -length - (end_radius ? length * start_radius / (end_radius - start_radius) : 0);

} else {

offset = start_radius ? length * end_radius / (start_radius - end_radius) : 0;

}

auto curve_segment = file.create<Ifc4x3_add2::IfcCurveSegment>();

curve_segment.setTransition(Ifc4x3_add2::IfcTransitionCode::IfcTransitionCode_CONTSAMEGRADIENT);

curve_segment.setPlacement(file.addPlacement2d(start_point.Coordinates()[0], start_point.Coordinates()[1], cos(start_direction), sin(start_direction)));

curve_segment.setSegmentLength(create_length(file, offset));

curve_segment.setSegmentLength(create_length(file, length));

curve_segment.setParentCurve(parent_curve);

result.first = curve_segment;

} else if (type == Ifc4x3_add2::IfcAlignmentHorizontalSegmentTypeEnum::IfcAlignmentHorizontalSegmentType_BLOSSCURVE) {

auto a0 = start_radius ? length / start_radius : 0.0; // constant term

auto a1 = 0.0; // linear term

auto a2 = 3 * f; // quadratic term

auto a3 = -2 * f; // cubic term

auto A0 = a0 ? length * pow(fabs(a0), -1. / 1.) * a0 / fabs(a0) : 0.0;

auto A1 = a1 ? length * pow(fabs(a1), -1. / 2.) * a1 / fabs(a1) : 0.0;

auto A2 = a2 ? length * pow(fabs(a2), -1. / 3.) * a2 / fabs(a2) : 0.0;

auto A3 = a3 ? length * pow(fabs(a3), -1. / 4.) * a3 / fabs(a3) : 0.0;

std::optional<double> A0_optional, A1_optional, A2_optional;

if (A0) {

A0_optional = A0;

}

if (A1) {

A1_optional = A1;

}

if (A2) {

A2_optional = A2;

}

auto parent_curve = file.create<Ifc4x3_add2::IfcThirdOrderPolynomialSpiral>();

parent_curve.setPosition(file.addPlacement2d(0., 0., 1.0, 0.));

parent_curve.setCubicTerm(A3);

parent_curve.setQuadraticTerm(A2_optional);

parent_curve.setLinearTerm(A1_optional);

parent_curve.setConstantTerm(A0_optional);

Ifc4x3_add2::IfcCurveSegment curve_segment = file.create<Ifc4x3_add2::IfcCurveSegment>();

curve_segment.setTransition(Ifc4x3_add2::IfcTransitionCode::IfcTransitionCode_CONTSAMEGRADIENT);

curve_segment.setPlacement(file.addPlacement2d(start_point.Coordinates()[0], start_point.Coordinates()[1], cos(start_direction), sin(start_direction)));

curve_segment.setSegmentLength(create_length(file, 0.0));

curve_segment.setSegmentLength(create_length(file, length));

curve_segment.setParentCurve(parent_curve);

result.first = curve_segment;

} else if (type == Ifc4x3_add2::IfcAlignmentHorizontalSegmentTypeEnum::IfcAlignmentHorizontalSegmentType_COSINECURVE) {

auto a0 = 0.5 * f + (start_radius ? length / start_radius : 0.0); // constant term

auto a1 = -0.5 * f; // cosine term

auto A0 = a0 ? length * pow(fabs(a0), -1. / 1.) * a0 / fabs(a0) : 0.0;

auto A1 = a1 ? length * pow(fabs(a1), -1. / 1.) * a1 / fabs(a1) : 0.0;

auto A0_optional = std::optional<double>();

if (A0) {

A0_optional = A0;

}

auto parent_curve = file.create<Ifc4x3_add2::IfcCosineSpiral>();

parent_curve.setPosition(file.addPlacement2d(0., 0., 1.0, 0.));

parent_curve.setCosineTerm(A1);

parent_curve.setConstantTerm(A0_optional);

Ifc4x3_add2::IfcCurveSegment curve_segment = file.create<Ifc4x3_add2::IfcCurveSegment>();

curve_segment.setTransition(Ifc4x3_add2::IfcTransitionCode::IfcTransitionCode_CONTSAMEGRADIENT);

curve_segment.setPlacement(file.addPlacement2d(start_point.Coordinates()[0], start_point.Coordinates()[1], cos(start_direction), sin(start_direction)));

curve_segment.setSegmentLength(create_length(file, 0.0));

curve_segment.setSegmentLength(create_length(file, length));

curve_segment.setParentCurve(parent_curve);

result.first = curve_segment;

} else if (type == Ifc4x3_add2::IfcAlignmentHorizontalSegmentTypeEnum::IfcAlignmentHorizontalSegmentType_CUBIC) {

double offset = 0;

double A0 = 0; // constant term

double A1 = 0; // linear term

double A2 = 0; // quadratic term

double A3 = 0; // cubic term

if (end_radius && start_radius && end_radius != start_radius)

{

f = (start_radius - end_radius) / end_radius;

A3 = f / (6. * start_radius * length);

offset = length / f;

} else if (end_radius) {

A3 = 1. / (6. * end_radius * length);

offset = 0.0;

} else if (start_radius) {

A3 = -1. / (6. * start_radius * length);

offset = -length;

}

auto parent_curve = file.create<Ifc4x3_add2::IfcPolynomialCurve>();

parent_curve.setPosition(file.addPlacement2d(0., 0., 1.0, 0.));

parent_curve.setCoefficientsX(std::vector<double>{0.0, 1.0});

parent_curve.setCoefficientsY(std::vector<double>{A0, A1, A2, A3});

Ifc4x3_add2::IfcCurveSegment curve_segment = file.create<Ifc4x3_add2::IfcCurveSegment>();

curve_segment.setTransition(Ifc4x3_add2::IfcTransitionCode::IfcTransitionCode_CONTSAMEGRADIENT);

curve_segment.setPlacement(file.addPlacement2d(start_point.Coordinates()[0], start_point.Coordinates()[1], cos(start_direction), sin(start_direction)));

curve_segment.setSegmentLength(create_length(file, offset));

curve_segment.setSegmentLength(create_length(file, length));

curve_segment.setParentCurve(parent_curve);

result.first = curve_segment;

} else if (type == Ifc4x3_add2::IfcAlignmentHorizontalSegmentTypeEnum::IfcAlignmentHorizontalSegmentType_HELMERTCURVE) {

auto a0_1 = start_radius ? length / start_radius : 0.0; // constant term, first half

auto a1_1 = 0.0; // linear term, first half

auto a2_1 = 2 * f; // quadratic term, first half

auto A0_1 = a0_1 ? length * pow(fabs(a0_1), -1. / 1.) * a0_1 / fabs(a0_1) : 0.0;

auto A1_1 = a1_1 ? length * pow(fabs(a1_1), -1. / 2.) * a1_1 / fabs(a1_1) : 0.0;

auto A2_1 = a2_1 ? length * pow(fabs(a2_1), -1. / 3.) * a2_1 / fabs(a2_1) : 0.0;

auto A0_1_optional = std::optional<double>();

if (A0_1) {

A0_1_optional = A0_1;

}

auto A1_1_optional = std::optional<double>();

if (A1_1) {

A1_1_optional = A1_1;

}

auto parent_curve1 = file.create<Ifc4x3_add2::IfcSecondOrderPolynomialSpiral>();

parent_curve1.setPosition(file.addPlacement2d(0., 0., 1.0, 0.));

parent_curve1.setQuadraticTerm(A2_1);

parent_curve1.setLinearTerm(A1_1_optional);

parent_curve1.setConstantTerm(A0_1_optional);

Ifc4x3_add2::IfcCurveSegment curve_segment1 = file.create<Ifc4x3_add2::IfcCurveSegment>();

curve_segment1.setTransition(Ifc4x3_add2::IfcTransitionCode::IfcTransitionCode_CONTSAMEGRADIENT);

curve_segment1.setPlacement(file.addPlacement2d(start_point.Coordinates()[0], start_point.Coordinates()[1], cos(start_direction), sin(start_direction)));

curve_segment1.setSegmentLength(create_length(file, 0.0));

curve_segment1.setSegmentLength(create_length(file, length / 2));

curve_segment1.setParentCurve(parent_curve1);

result.first = curve_segment1;

auto a0_2 = -f + (start_radius ? length / start_radius : 0.0); // constant term, second half

auto a1_2 = 4 * f; // linear term, second half

auto a2_2 = -2 * f; // quadratic term, second half

auto A0_2 = a0_2 ? length * pow(fabs(a0_2), -1. / 1.) * a0_2 / fabs(a0_2) : 0.0;

auto A1_2 = a1_2 ? length * pow(fabs(a1_2), -1. / 2.) * a1_2 / fabs(a1_2) : 0.0;

auto A2_2 = a2_2 ? length * pow(fabs(a2_2), -1. / 3.) * a2_2 / fabs(a2_2) : 0.0;

auto A0_2_optional = std::optional<double>();

if (A0_2) {

A0_2_optional = A0_2;

}

auto A1_2_optional = std::optional<double>();

if (A1_2) {

A1_2_optional = A1_2;

}

Ifc4x3_add2::IfcCurve parent_curve2 = file.create<Ifc4x3_add2::IfcSecondOrderPolynomialSpiral>();

parent_curve1.setPosition(file.addPlacement2d(0., 0., 1.0, 0.));

parent_curve1.setQuadraticTerm(A2_2);

parent_curve1.setLinearTerm(A1_2_optional);

parent_curve1.setConstantTerm(A0_2_optional);

Ifc4x3_add2::IfcCurveSegment curve_segment2 = file.create<Ifc4x3_add2::IfcCurveSegment>();

curve_segment2.setTransition(Ifc4x3_add2::IfcTransitionCode::IfcTransitionCode_CONTSAMEGRADIENT);

curve_segment2.setPlacement(file.addPlacement2d(start_point.Coordinates()[0], start_point.Coordinates()[1], cos(start_direction), sin(start_direction)));

curve_segment2.setSegmentLength(create_length(file, length / 2));

curve_segment2.setSegmentLength(create_length(file, length / 2));

curve_segment2.setParentCurve(parent_curve2);

result.second = curve_segment2;

} else if (type == Ifc4x3_add2::IfcAlignmentHorizontalSegmentTypeEnum::IfcAlignmentHorizontalSegmentType_SINECURVE) {

auto a0 = start_radius ? length / start_radius : 0.0; // constant term

auto a1 = f; // linear term

auto a2 = -f / (2 * PI); // sine term

auto A0 = a0 ? length * pow(fabs(a0), -1. / 1.) * a0 / fabs(a0) : 0.0;

auto A1 = a1 ? length * pow(fabs(a1), -1. / 2.) * a1 / fabs(a1) : 0.0;

auto A2 = a2 ? length * pow(fabs(a2), -1. / 1.) * a2 / fabs(a2) : 0.0;

auto A0_optional = std::optional<double>();

if (A0) {

A0_optional = A0;

}

auto A1_optional = std::optional<double>();

if (A1) {

A1_optional = A1;

}

auto parent_curve = file.create<Ifc4x3_add2::IfcSineSpiral>();

parent_curve.setPosition(file.addPlacement2d(0., 0., 1.0, 0.));

parent_curve.setSineTerm(A2);

parent_curve.setLinearTerm(A1_optional);

parent_curve.setConstantTerm(A0_optional);

Ifc4x3_add2::IfcCurveSegment curve_segment = file.create<Ifc4x3_add2::IfcCurveSegment>();

curve_segment.setTransition(Ifc4x3_add2::IfcTransitionCode::IfcTransitionCode_CONTSAMEGRADIENT);

curve_segment.setPlacement(file.addPlacement2d(start_point.Coordinates()[0], start_point.Coordinates()[1], cos(start_direction), sin(start_direction)));

curve_segment.setSegmentLength(create_length(file, 0.0));

curve_segment.setSegmentLength(create_length(file, length));

curve_segment.setParentCurve(parent_curve);

result.first = curve_segment;

} else if (type == Ifc4x3_add2::IfcAlignmentHorizontalSegmentTypeEnum::IfcAlignmentHorizontalSegmentType_VIENNESEBEND) {

logger::warning(std::string("mapping of AlignmentHorizontalSegmentType VIENNESEBEND not supported"));

} else {

logger::error(std::string("unexpected AlignmentHorizontalSegmentType encountered"));

}

return result;

}

std::pair<Ifc4x3_add2::IfcCurveSegment, Ifc4x3_add2::IfcCurveSegment> mapAlignmentVerticalSegment(hierarchy_helper<Ifc4x3_add2>& file, const Ifc4x3_add2::IfcAlignmentVerticalSegment& segment) {

std::pair<Ifc4x3_add2::IfcCurveSegment, Ifc4x3_add2::IfcCurveSegment> result;

auto start_distance_along = segment.StartDistAlong();

auto horizontal_length = segment.HorizontalLength();

auto start_height = segment.StartHeight();

auto start_gradient = segment.StartGradient();

auto end_gradient = segment.EndGradient();

auto radius_of_curvature = segment.RadiusOfCurvature();

auto type = segment.PredefinedType();

if (type == Ifc4x3_add2::IfcAlignmentVerticalSegmentTypeEnum::IfcAlignmentVerticalSegmentType_CONSTANTGRADIENT) {

auto parent_curve = file.create<Ifc4x3_add2::IfcLine>();

parent_curve.setPnt(file.addDoublet<Ifc4x3_add2::IfcCartesianPoint>(0, 0));

auto vec = file.create<Ifc4x3_add2::IfcVector>();

vec.setOrientation(file.addDoublet<Ifc4x3_add2::IfcDirection>(1, 0));

vec.setMagnitude(1.0);

parent_curve.setDir(vec);

// IfcCurveSegment.SegmentLength is the length of the curve segment, not the horizontal length.

auto dx = cos(atan(start_gradient));

auto dy = sin(atan(start_gradient));

auto segment_curve_length = horizontal_length / dx;

auto curve_segment = file.create<Ifc4x3_add2::IfcCurveSegment>();

curve_segment.setTransition(Ifc4x3_add2::IfcTransitionCode::IfcTransitionCode_CONTSAMEGRADIENT);

curve_segment.setPlacement(file.addPlacement2d(start_distance_along, start_height, dx, dy));

curve_segment.setSegmentLength(create_length(file, 0.0));

curve_segment.setSegmentLength(create_length(file, segment_curve_length));

curve_segment.setParentCurve(parent_curve);

result.first = curve_segment;

} else if (type == Ifc4x3_add2::IfcAlignmentVerticalSegmentTypeEnum::IfcAlignmentVerticalSegmentType_PARABOLICARC) {

double A = start_height;

double B = start_gradient;

double C = (end_gradient - start_gradient) / (2 * horizontal_length);

auto parent_curve = file.create<Ifc4x3_add2::IfcPolynomialCurve>();

parent_curve.setPosition(file.addPlacement2d(0., 0., 1.0, 0.));

parent_curve.setCoefficientsX(std::vector<double>{0.0, 1.0});

parent_curve.setCoefficientsY(std::vector<double>{A, B, C});

// IfcCurveSegment.SegmentLength is the length of the curve segment, not the horizontal length.

// The curve length is calculated by integrating the differential curve length equation sqrt(1 + (dy/dx)^2) from 0 to horizontal_length.

// y = A + Bx + Cx^2

// dy/dx = B + 2Cx

auto dx = cos(atan(start_gradient));

auto dy = sin(atan(start_gradient));

auto curve_length_fn = [B, C](double x) { return sqrt(1 + pow(B + 2*C * x, 2)); };

auto segment_curve_length = boost::math::quadrature::trapezoidal(curve_length_fn, 0.0, horizontal_length);

auto curve_segment = file.create<Ifc4x3_add2::IfcCurveSegment>();

curve_segment.setTransition(Ifc4x3_add2::IfcTransitionCode::IfcTransitionCode_CONTSAMEGRADIENT);

curve_segment.setPlacement(file.addPlacement2d(start_distance_along, start_height, dx, dy));

curve_segment.setSegmentLength(create_length(file, 0.0));

curve_segment.setSegmentLength(create_length(file, segment_curve_length));

curve_segment.setParentCurve(parent_curve);

result.first = curve_segment;

} else if (type == Ifc4x3_add2::IfcAlignmentVerticalSegmentTypeEnum::IfcAlignmentVerticalSegmentType_CLOTHOID) {

logger::warning(std::string("mapping of AlignmentVerticalSegmentType CLOTHOID not supported"));

} else if (type == Ifc4x3_add2::IfcAlignmentVerticalSegmentTypeEnum::IfcAlignmentVerticalSegmentType_CIRCULARARC) {

auto start_angle = atan(start_gradient);

auto end_angle = atan(end_gradient);

double radius;

if (start_angle < end_angle) {

radius = horizontal_length / (sin(end_angle) - sin(start_angle));

} else {

radius = horizontal_length / (sin(start_angle) - sin(end_angle));

}

auto parent_curve = file.create<Ifc4x3_add2::IfcCircle>();

parent_curve.setPosition(file.addPlacement2d(0., 0., 1.0, 0.));

parent_curve.setRadius(radius);

auto segment_curve_length = radius * fabs(end_angle - start_angle);

Ifc4x3_add2::IfcCurveSegment curve_segment = file.create<Ifc4x3_add2::IfcCurveSegment>();

curve_segment.setTransition(Ifc4x3_add2::IfcTransitionCode::IfcTransitionCode_CONTSAMEGRADIENT);

curve_segment.setPlacement(file.addPlacement2d(start_distance_along, start_height, 1.0, 0.));

curve_segment.setSegmentLength(create_length(file, 0.0));

curve_segment.setSegmentLength(create_length(file, segment_curve_length));

curve_segment.setParentCurve(parent_curve);

result.first = curve_segment;

} else {

logger::error(std::string("unexpected AlignmentVerticalSegmentType encountered"));

}

return result;

}

std::pair<Ifc4x3_add2::IfcCurveSegment, Ifc4x3_add2::IfcCurveSegment> mapAlignmentCantSegment(hierarchy_helper<Ifc4x3_add2>& file, const Ifc4x3_add2::IfcAlignmentCantSegment& segment) {

std::pair<Ifc4x3_add2::IfcCurveSegment, Ifc4x3_add2::IfcCurveSegment> result;

auto type = segment.PredefinedType();

if (type == Ifc4x3_add2::IfcAlignmentCantSegmentTypeEnum::IfcAlignmentCantSegmentType_BLOSSCURVE) {

logger::warning(std::string("mapping of AlignmentCantSegmentType BLOSSCURVE not supported"));

} else if (type == Ifc4x3_add2::IfcAlignmentCantSegmentTypeEnum::IfcAlignmentCantSegmentType_CONSTANTCANT) {

logger::warning(std::string("mapping of AlignmentCantSegmentType CONSTANTCANT not supported"));

} else if (type == Ifc4x3_add2::IfcAlignmentCantSegmentTypeEnum::IfcAlignmentCantSegmentType_COSINECURVE) {

logger::warning(std::string("mapping of AlignmentCantSegmentType COSINECURVE not supported"));

} else if (type == Ifc4x3_add2::IfcAlignmentCantSegmentTypeEnum::IfcAlignmentCantSegmentType_HELMERTCURVE) {

logger::warning(std::string("mapping of AlignmentCantSegmentType HELMERTCURVE not supported"));

} else if (type == Ifc4x3_add2::IfcAlignmentCantSegmentTypeEnum::IfcAlignmentCantSegmentType_LINEARTRANSITION) {

logger::warning(std::string("mapping of AlignmentCantSegmentType LINEARTRANSTION not supported"));

} else if (type == Ifc4x3_add2::IfcAlignmentCantSegmentTypeEnum::IfcAlignmentCantSegmentType_SINECURVE) {

logger::warning(std::string("mapping of AlignmentCantSegmentType SINECURVE not supported"));

} else if (type == Ifc4x3_add2::IfcAlignmentCantSegmentTypeEnum::IfcAlignmentCantSegmentType_VIENNESEBEND) {

logger::warning(std::string("mapping of AlignmentCantSegmentType VIENNESEBEND not supported"));

} else {

logger::error(std::string("unexpected AlignmentCantSegmentType encountered"));

}

return result;

}

#endif