mirror of
https://github.com/IfcOpenShell/IfcOpenShell.git
synced 2026-08-09 17:31:45 +00:00
Richard Brice
165 lines
8.0 KiB
C++
165 lines
8.0 KiB
C++
/********************************************************************************
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* *
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* This file is part of IfcOpenShell. *
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* *
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* IfcOpenShell is free software: you can redistribute it and/or modify *
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* it under the terms of the Lesser GNU General Public License as published by *
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* the Free Software Foundation, either version 3.0 of the License, or *
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* (at your option) any later version. *
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* *
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* IfcOpenShell is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* Lesser GNU General Public License for more details. *
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* *
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* You should have received a copy of the Lesser GNU General Public License *
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* along with this program. If not, see <http://www.gnu.org/licenses/>. *
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* *
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********************************************************************************/
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// This example illustrates the basic of building an alignment model.
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// The alignment is based on "Bridge Geometry Manual", April 2022
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// US Department of Transportation, Federal Highway Administration (FHWA)
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// https://www.fhwa.dot.gov/bridge/pubs/hif22034.pdf
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//
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// Sections and page number for this document are cited in the code comments.
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//
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// This examples differs from IfcAlignment because it uses utility methods
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// to simplify alignment construction
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// Disable warnings coming from IfcOpenShell
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#pragma warning(disable : 4018 4267 4250 4984 4985)
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#include "../ifcparse/Ifc4x3_add2.h"
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#include "../ifcparse/IfcAlignmentHelper.h"
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#include <fstream>
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#define Schema Ifc4x3_add2
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// performs basic project setup including created the IfcProject object
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// and initializing the project units to FEET
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Schema::IfcProject* setup_project(IfcHierarchyHelper<Schema>& file) {
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std::vector<std::string> file_description;
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file_description.push_back("ViewDefinition[Alignment-basedReferenceView]");
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file.header().file_description().description(file_description);
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auto project = file.addProject();
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project->setName(std::string("FHWA Bridge Geometry Manual Example Alignment"));
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project->setDescription(std::string("C++ Example - Simplified"));
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// set up project units for feet
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// the call to file.addProject() sets up length units as millimeter.
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auto units_in_context = project->UnitsInContext();
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auto units = units_in_context->Units();
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auto begin = units->begin();
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auto iter = begin;
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auto end = units->end();
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for (; iter != end; iter++) {
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auto unit = *iter;
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if (unit->as<Schema::IfcSIUnit>() && unit->as<Schema::IfcSIUnit>()->UnitType() == Schema::IfcUnitEnum::IfcUnit_LENGTHUNIT) {
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auto dimensions = new Schema::IfcDimensionalExponents(1, 0, 0, 0, 0, 0, 0);
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file.addEntity(dimensions);
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auto conversion_factor = new Schema::IfcMeasureWithUnit(new Schema::IfcLengthMeasure(304.80), unit->as<Schema::IfcSIUnit>());
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file.addEntity(conversion_factor);
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auto conversion_based_unit = new Schema::IfcConversionBasedUnit(dimensions, Schema::IfcUnitEnum::IfcUnit_LENGTHUNIT, "FEET", conversion_factor);
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file.addEntity(conversion_based_unit);
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units->remove(unit); // remove the millimeter unit
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units->push(conversion_based_unit); // add the feet unit
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units_in_context->setUnits(units); // update the UnitsInContext
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break; // Done!, the length unit was found, so break out of the loop
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}
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}
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return project;
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}
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int main() {
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IfcHierarchyHelper<Schema> file;
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auto project = setup_project(file);
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//
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// Define horizontal alignment
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//
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// PI Data
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// B.1.1 pg 211
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std::vector<std::pair<double, double>> points{
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{ 500.0, 2500.0}, // beginning
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{3340.0, 660.0}, // Point of intersection (PI), Curve #1
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{4340.0, 5000.0}, // Point of intersection (PI), Curve #2
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{7600.0, 4560.0}, // Point of intersection (PI), Curve #3
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{8480.0, 2010.0} // ending
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};
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// Curve Data
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// B.1.3 pg 212
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std::vector<double> radii{ 1000,1250,950 };
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//
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// Define vertical profile segments
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//
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// Vertical Profile Data
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// Figure B.2 pg 213
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double xStart = 10000.0; // subtract xStart so the points are distance along, not station
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std::vector<std::pair<double,double>> vpoints {
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{10000.0-xStart,100.0}, // Vertical point of beginning (VPOB)
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{12000.0-xStart,135.0}, // Point of vertical intersection (VPI), Curve #1
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{15000.0-xStart,105.0}, // Point of vertical intersection (VPI), Curve #2
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{17400.0-xStart,153.0}, // Point of vertical intersection (VPI), Curve #3
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{19800.0-xStart,105.0}, // Point of vertical intersection (VPI), Curve #4
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{22800.0-xStart, 90.0} // Vertical poitn of ending (VPOE)
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};
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// Vertical Curve Lengths
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// Figure B.2 pg 213
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std::vector<double> vclengths{1600.0, 1200.0, 2000.0, 800.0};
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// Use utility function to create alignment
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auto alignment = addAlignment(file, "Example Alignment", points, radii, vpoints, vclengths);
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// Define the alignment's relationship with the project
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// IFC 4.1.4.1.1 "Every IfcAlignment must be related to IfcProject using the IfcRelAggregates relationship"
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// https://standards.buildingsmart.org/IFC/RELEASE/IFC4_3/HTML/concepts/Object_Composition/Aggregation/Alignment_Aggregation_To_Project/content.html
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// IfcProject <-> IfcRelAggregates <-> IfcAlignment
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typename aggregate_of<typename Schema::IfcObjectDefinition>::ptr list_of_alignments_in_project(new aggregate_of<typename Schema::IfcObjectDefinition>());
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list_of_alignments_in_project->push(alignment);
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auto aggregate_alignments_with_project = new Schema::IfcRelAggregates(IfcParse::IfcGlobalId(), nullptr, std::string("Alignments in project"), boost::none, project, list_of_alignments_in_project);
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file.addEntity(aggregate_alignments_with_project);
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// Define the spatial structure of the alignment with respect to the site
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// IFC 4.1.5.1 alignment is referenced in spatial structure of an IfcSpatialElement. In this case IfcSite is the highest level IfcSpatialElement
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// https://standards.buildingsmart.org/IFC/RELEASE/IFC4_3/HTML/concepts/Object_Connectivity/Alignment_Spatial_Reference/content.html
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// IfcSite <-> IfcRelReferencedInSpatialStructure <-> IfcAlignment
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// This means IfcAlignment is not part of the IfcSite (it is not an aggregate component) but instead IfcAlignment is used within
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// the IfcSite by reference. This implies an IfcAlignment can traverse many IfcSite instances within an IfcProject
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typename Schema::IfcSpatialReferenceSelect::list::ptr list_alignments_referenced_in_site(new Schema::IfcSpatialReferenceSelect::list);
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list_alignments_referenced_in_site->push(alignment);
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// Complete the model by creating sites for the 3 bridges
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for (int i = 1; i <= 3; i++) {
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std::ostringstream os;
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os << "Site of Bridge " << i;
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auto site = file.addSite(project, nullptr);
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site->setName(os.str());
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std::ostringstream description;
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description << "Alignments referenced into the spatial structure of Bridge Site " << i;
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auto rel_referenced_in_spatial_structure = new Schema::IfcRelReferencedInSpatialStructure(IfcParse::IfcGlobalId(), nullptr, boost::none, description.str(), list_alignments_referenced_in_site, site);
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file.addEntity(rel_referenced_in_spatial_structure);
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}
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// That's it - save the model to a file
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std::ofstream ofs("FHWA_Bridge_Geometry_Alignment_Example_Simplified.ifc");
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ofs << file;
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}
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