code: public Object getVertex(final Point2D point2D) {
          final GraphElementAccessor<?, ?> pickSupport = _visualizationViewer.getPickSupport();
  
          @SuppressWarnings("rawtypes") final Layout graphLayout = _visualizationViewer.getModel().getGraphLayout();
  
          @SuppressWarnings("unchecked") final Object vertex = pickSupport.getVertex(graphLayout, point2D.getX(), point2D.getY());
  
          return vertex;
      }
docs: Gets the vertex at a particular point, or null if it does not exist.
  
  @param point2D
  @return