 functions only using the \callergraph command.  CALLER_GRAPH           = NO  # If the GRAPHICAL_HIERARCHY and HAVE_DOT tags are set to YES then doxygen # will generate a graphical hierarchy of all classes instead of a textual one.  GRAPHICAL_HIERARCHY    = YES  # If the DIRECTORY_GRAPH, SHOW_DIRECTORIES and HAVE_DOT tags are set to YES # then doxygen will show the dependencies a directory has on other directories # in a graphical way. The dependency relations are determined by the #include # relations between the files in the directories.  DIRECTORY_GRAPH        = YES  # The DOT_IMAGE_FORMAT tag can be used to set the image format of the images # generated by dot. Possible values are 