@Override public void visitTrack(Track track){
  DefaultEntityViewInfo vInfo=(DefaultEntityViewInfo)track.getViewInfo();
  if (vInfo != null && scale >= vInfo.minVisibleScale * displayFactor) {
    trackBuffer.add(track);
  }
}

@ Override public void visitTrack ( Track track ) { DefaultEntityViewInfo vInfo = ( DefaultEntityViewInfo ) track . getViewInfo ( ) ; if ( vInfo != null && scale >= vInfo . minVisibleScale * displayFactor ) { trackBuffer . add ( track ) ; } }
classifies the entity and possibly adds it to a buffer for printing .
