Function setup_project

src/examples/IfcAlignment.cpp:46–83

performs basic project setup including created the IfcProject object and initializing the project units to FEET

// performs basic project setup including created the IfcProject object
// and initializing the project units to FEET
Schema::IfcProject* setup_project(IfcHierarchyHelper<Schema>& file) {
    std::vector<std::string> file_description;
    file_description.push_back("ViewDefinition[Alignment-basedReferenceView]");
    file.header().file_description()->setdescription(file_description);

    auto project = file.addProject();
    project->setName(std::string("FHWA Bridge Geometry Manual Example Alignment"));
    project->setDescription(std::string("C++ Example"));

    // set up project units for feet
    // the call to file.addProject() sets up length units as millimeter.
    auto units_in_context = project->UnitsInContext();
    auto units = units_in_context->Units();
    auto begin = units->begin();
    auto iter = begin;
    auto end = units->end();
    for (; iter != end; iter++) {
        auto unit = *iter;
        if (unit->as<Schema::IfcSIUnit>() && unit->as<Schema::IfcSIUnit>()->UnitType() == Schema::IfcUnitEnum::IfcUnit_LENGTHUNIT) {
            auto dimensions = new Schema::IfcDimensionalExponents(1, 0, 0, 0, 0, 0, 0);
            file.addEntity(dimensions);

            auto conversion_factor = new Schema::IfcMeasureWithUnit(new Schema::IfcLengthMeasure(304.80), unit->as<Schema::IfcSIUnit>());
            file.addEntity(conversion_factor);

            auto conversion_based_unit = new Schema::IfcConversionBasedUnit(dimensions, Schema::IfcUnitEnum::IfcUnit_LENGTHUNIT, "FEET", conversion_factor);
            file.addEntity(conversion_based_unit);

            units->remove(unit);                // remove the millimeter unit
            units->push(conversion_based_unit); // add the feet unit
            units_in_context->setUnits(units);  // update the UnitsInContext

            break; // Done!, the length unit was found, so break out of the loop
        }
    }

    return project;
}

// creates geometry and business logic segments for horizontal alignment tangent runs
std::pair<typename Schema::IfcCurveSegment*, typename Schema::IfcAlignmentSegment*> create_tangent(typename Schema::IfcCartesianPoint* p, double dir, double length) {