Method ComputeCurve

src/cpp/web-ifc/geometry/IfcGeometryLoader.cpp:1731–3071

  }

  void IfcGeometryLoader::ComputeCurve(uint32_t expressID, IfcCurve &curve, const ComputeCurveParams& params) const
  {
    spdlog::debug("[ComputeCurve({})]", expressID);
    auto lineType = _loader.GetLineType(expressID);
    switch (lineType)
    {
    case schema::IFCPOLYLINE:
    {
      _loader.MoveToArgumentOffset(expressID, 0);
      auto points = _loader.GetSetArgument();

      for (auto &token : points)
      {
        uint32_t pointId = _loader.GetRefArgument(token);
        if (params.dimensions == 2)
          curve.Add(GetCartesianPoint2D(pointId));
        else
          curve.Add(GetCartesianPoint3D(pointId));
      }

      if (params.edge)
      {
        if (params.sameSense == 1 || params.sameSense == -1)
        {
          std::reverse(curve.points.begin(), curve.points.end());
        }
      }

      break;
    }
    case schema::IFCCOMPOSITECURVE:
    {
        // IfcCompositeCurve
        //      std::vector<IfcSegment>			Segments;
        //      IfcLogical						SelfIntersect;

      _loader.MoveToArgumentOffset(expressID, 0);
      auto segments = _loader.GetSetArgument();
      auto selfIntersects = _loader.GetStringArgument();

      if (selfIntersects == "T")
      {
        // TODO: this is probably bad news
        spdlog::error("[ComputeCurve()] Self intersecting composite curve {}", expressID);
      }

      for (size_t ii = 0; ii < segments.size(); ++ii)
      {
          uint32_t segmentId = _loader.GetRefArgument(segments[ii]);
          ComputeCurve(segmentId, curve, params);
          
        #ifdef DEBUG_DUMP_SVG
          dump::DumpCurveToHtml(curve.points, "dumpCurve.html");
        #endif
      }

      break;
    }