Function create_gradient

src/examples/IfcAlignment.cpp:132–150

creates geometry and business logic segments for vertical profile gradient runs

// creates geometry and business logic segments for vertical profile gradient runs
std::pair<typename Schema::IfcCurveSegment*, typename Schema::IfcAlignmentSegment*> create_gradient(typename Schema::IfcCartesianPoint* p, double slope, double length) {
    // geometry
    auto parent_curve = new Schema::IfcLine(
        new Schema::IfcCartesianPoint(std::vector<double>({0, 0})),
        new Schema::IfcVector(new Schema::IfcDirection(std::vector<double>{1, 0}), 1.0));

    auto curve_segment = new Schema::IfcCurveSegment(
        Schema::IfcTransitionCode::IfcTransitionCode_CONTSAMEGRADIENT,
        new Schema::IfcAxis2Placement2D(p, new Schema::IfcDirection(std::vector<double>{sqrt(1 - slope * slope), slope})),
        new Schema::IfcLengthMeasure(0.0), // start
        new Schema::IfcLengthMeasure(length),
        parent_curve);

    // business logic
    auto design_parameters = new Schema::IfcAlignmentVerticalSegment(boost::none, boost::none, p->Coordinates()[0], length, p->Coordinates()[1], slope, slope, boost::none, Schema::IfcAlignmentVerticalSegmentTypeEnum::IfcAlignmentVerticalSegmentType_CONSTANTGRADIENT);
    auto alignment_segment = new Schema::IfcAlignmentSegment(IfcParse::IfcGlobalId(), nullptr, boost::none, boost::none, boost::none, nullptr, nullptr, design_parameters);

    return {curve_segment, alignment_segment};
}

// creates geometry and business logic segments for vertical profile parabolic vertical curves
std::pair<typename Schema::IfcCurveSegment*, typename Schema::IfcAlignmentSegment*> create_vcurve(typename Schema::IfcCartesianPoint* p, double start_slope, double end_slope, double length) {