
plslabelfunc: Assign a function to use for generating custom axis labels 

DESCRIPTION:

    This function is used in example 19. 

SYNOPSIS:

plslabelfunc(label_func, label_data)

ARGUMENTS:

    label_func (void (*) (PLINT, PLFLT, char *, PLINT, PLPointer), input)
    :    This is the custom label function.  In order to reset to the
    default labelling, set this to NULL. The labelling function
    parameters are, in order: axis:    This indicates which axis a
    label is being requested for. The value will be one of PL_X_AXIS,
    PL_Y_AXIS or PL_Z_AXIS. 

    value:    This is the value along the axis which is being labelled. 

    label_text:    The string representation of the label value. 

    length:    The maximum length in characters allowed for label_text. 


    label_data (PLPointer, input) :    This parameter may be used to pass
    data to the label_func function. 
