Method drawConnectionPoints

QtNodeEditor/src/NodePainter.cpp:106–185

void
NodePainter::
drawConnectionPoints(QPainter* painter,
                     NodeGeometry const& geom,
                     NodeState const& state,
                     NodeDataModel const * model,
                     FlowScene const & scene)
{
  NodeStyle const& nodeStyle      = model->nodeStyle();
  auto const     &connectionStyle = StyleCollection::connectionStyle();

  float diameter = nodeStyle.ConnectionPointDiameter;
  auto  reducedDiameter = diameter * 0.6;

  for(PortType portType: {PortType::Out, PortType::In})
  {
    size_t n = state.getEntries(portType).size();

    for (unsigned int i = 0; i < n; ++i)
    {
      QPointF p = geom.portScenePosition(i, portType);

      auto const & dataType = model->dataType(portType, i);

      bool canConnect = (state.getEntries(portType)[i].empty() ||
                         (portType == PortType::Out &&
                          model->portOutConnectionPolicy(i) == NodeDataModel::ConnectionPolicy::Many) );

      double r = 1.0;
      if (state.isReacting() &&
          canConnect &&
          portType == state.reactingPortType())
      {

        auto   diff = geom.draggingPos() - p;
        double dist = std::sqrt(QPointF::dotProduct(diff, diff));
        bool   typeConvertable = false;

        {
          if (portType == PortType::In)
          {
            typeConvertable = scene.registry().getTypeConverter(state.reactingDataType(), dataType) != nullptr;
          }
          else
          {
            typeConvertable = scene.registry().getTypeConverter(dataType, state.reactingDataType()) != nullptr;
          }
        }

        if (state.reactingDataType().id == dataType.id || typeConvertable)
        {
          double const thres = 40.0;
          r = (dist < thres) ?
                (2.0 - dist / thres ) :
                1.0;
        }
        else
        {