C+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
C
C    VECTOR - Visualisation of normal coordinate displacement vectors:
C
C             1/ calculated with VIBCA (option IFVCT=1) from deck produced by 
C                program FC from FIREFLY output
C             2/ from CFOUR output
C             3/ from GAUSSIAN output
C             4/ from FIREFLY (possibly GAMESS-US output)
C
C             The eigenvectors can be toggled through, scaled, rotated,
C             reversed, and plotted as weighted/unweighted.
C
C             Output can be written to a script file for the GLE program, which
C             will generate a plot of the viewed normal mode.  Postscript, PDF,
C             JPEG etc. version of the diagram are then possible.
C
C
C       ver.  14.XI.2021                          ----- Zbigniew KISIEL -----
C                          __________________________________________________
C                         | Institute of Physics, Polish Academy of Sciences |
C                         | Al.Lotnikow 32/46, Warszawa, POLAND              |
C                         |                             kisiel@ifpan.edu.pl  |
C                         |     http://info.ifpan.edu.pl/~kisiel/prospe.htm  |
C_________________________/--------------------------------------------------
C
C  Modification history:
C
c     2.93:  Creation
c  2.09.98:  Addition of output to file from display mode
C 13.12.98:  Modification of vdW radius selection in BONLOC
c 27.03.99:  Addition of some colour
c 20.03.01:  Transfer of various mods from PMIFST
c  1.01.10:  Port to CVF
c  3.01.09:  Port to IVF
c 12.04.10:  Gle output
c  7.04.20:  Migration to XE2011
c 12.08.21:  Tweaked gle output of normal mode vectors
c 18.08.21:  Also read CFOUR output
c 14.11.21:  Also read Gaussian+Firefly output + overhaul of gle output
C
C----------------------------------------------------------------------------
C
C   NOTE:   This is an IBM-PC bound program and it is tied to the graphics
C           package incorporated with Compaq Visual Fortran and its descendents
C           (currently Intel Visual Fortran).  
C           
C           It is possible that the program will run on Linux under Wine by
C           using the prescription described for the AABS package at:
C           http://info.ifpan.edu.pl/~kisiel/aabs/aabs.htm#linux
C
C_____________________________________________________________________________
C
C   When molecule is displayed under the rotation option, various actions
C   can be selected by the following keys:
C
C     U - toggle mass weighted/unweighted eigenvectors
C  up/down arrows - toggle through eigenvectors
C  left/right arrows - vary vector scaling
C     - - reverse vector phase
C   E,X - rotation about the horizontal axis
C   S,D - rotation about the vertical axis
C   W,R - rotation about the axis perpendicular to the plane of the screen
C         (the six keys above are case sensitive - lower case gives slow and
C          upper case fast rotation)
C     N - display numbers of atoms
C     A - display principal axes
C     G - generate output file for the GLE program to plot the molecule and 
C         the currently displayed mode
C     O - generate output file VECTOR.COR with effects of motion along the
C         current mode on rotational parameters
C     P - parameter checks: display is switched to a mode allowing checks of
C         values of bond lengths and bond angles
C         In this mode:
C         - B selects calculation of bond length to be followed by two atom
C           numbers
C         - A selects calculation of bond angle to be followed by three atom
C           numbers, a,b or c can be input instead of the third number for
C           calculation of angle between bond and a principal axis
C         - D selects calculation of dihedral angle to be followed by
C           four atom numbers
C         - E exits back to previous screen
C  <cr> - termination of graphics display
C
C-----------------------------------------------------------------------------
C     I N S T A L L A T I O N:
C-----------------------------------------------------------------------------
C
C     1/ place VECTOR.EXE and PMIFST.CFG in directory C:\ROT
C     2/ using Windows Explorer send a shortcut to VECTOR to the desktop
C     3/ add C:\ROT to the PATH if it is planned to launch from the command
C        prompt
C
C-----------------------------------------------------------------------------
C     R U N N I N G:
C-----------------------------------------------------------------------------
C
C   - If the C:\ROT directory has been added to the PATH then VECTOR can
C     be called from the Command prompt window set to any directory.  
C     This directory is treated as the default directory for any output.
C
C   - Drag and drop operation is possible if VECTOR icon has been placed
C     on the desktop.  Drag the appropriate output file to VECTOR,
C     then select the appropriate input type, and just press the ENTER key 
C    	in response to the file name question.  
C
C===========================================================================