; docformat = 'rst'
;
; NAME:
;   cgOPlot
;
; PURPOSE:
;   The purpose of cgOPlot is to create a drop-in replacement for the traditional
;   IDL command, OPlot. The program calls cgPlot with the Overplot keyword set.
;
;******************************************************************************************;
;                                                                                          ;
;  Copyright (c) 2012, by Fanning Software Consulting, Inc. All rights reserved.           ;
;                                                                                          ;
;  Redistribution and use in source and binary forms, with or without                      ;
;  modification, are permitted provided that the following conditions are met:             ;
;                                                                                          ;
;      * Redistributions of source code must retain the above copyright                    ;
;        notice, this list of conditions and the following disclaimer.                     ;
;      * Redistributions in binary form must reproduce the above copyright                 ;
;        notice, this list of conditions and the following disclaimer in the               ;
;        documentation and/or other materials provided with the distribution.              ;
;      * Neither the name of Fanning Software Consulting, Inc. nor the names of its        ;
;        contributors may be used to endorse or promote products derived from this         ;
;        software without specific prior written permission.                               ;
;                                                                                          ;
;  THIS SOFTWARE IS PROVIDED BY FANNING SOFTWARE CONSULTING, INC. ''AS IS'' AND ANY        ;
;  EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES    ;
;  OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT     ;
;  SHALL FANNING SOFTWARE CONSULTING, INC. BE LIABLE FOR ANY DIRECT, INDIRECT,             ;
;  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED    ;
;  TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;         ;
;  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND             ;
;  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT              ;
;  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS           ;
;  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.                            ;
;******************************************************************************************;
;
;+
; The purpose of cgOPlot is to create a drop-in replacement for the traditional
; IDL command, OPlot. It simply calls cgPlot with the OVERPLOT keyword set.
; 
; The program requires the `Coyote Library <http://www.idlcoyote.com/documents/programs.php>`
; to be installed on your machine.
;
; :Categories:
;    Graphics
;    
; :Params:
;    x: in, required, type=any
;         If X is provided without Y, a vector representing the dependent values to be 
;         plotted If both X and Y are provided, X is the independent parameter and 
;         Y is the dependent parameter to be plotted.
;    y: in, optional, type=any
;         A vector representing the dependent values to be plotted.
;       
; :Keywords:
;     addcmd: in, optional, type=boolean, default=0
;        Set this keyword to add the command to the resizeable graphics window cgWindow.
;     charsize: in, optional, type=float, default=cgDefCharSize()
;        The character size for axes annotations. Uses cgDefCharSize to select default
;        character size, unless !P.Charsize is set, in which case !P.Charsize is always used.
;     color: in, optional, type=string/integer, default='black'
;        If this keyword is a string, the name of the data color. By default, 'black'.
;        Color names are those used with cgColor. Otherwise, the keyword is assumed 
;        to be a color index into the current color table.
;     psym: in, optional, type=integer
;        Any normal IDL PSYM values, plus any value supported by the Coyote Library
;        routine cgSYMCAT. An integer between 0 and 46.
;     symcolor: in, optional, type=string/integer, default='black'
;        If this keyword is a string, the name of the symbol color. By default, 'black'.
;        Otherwise, the keyword is assumed to be a color index into the current color table.
;     symsize: in, optional, type=float, default=1.0
;        The symbol size.
;     _ref_extra: in, optional, type=any
;        Any keyword appropriate for the IDL OPlot command is allowed in the program.
;
; :Examples:
;    Use as you would use the IDL OPLOT command::
;       cgPlot, cgDemoData(17), Color='olive'
;       cgPlot, cgDemoData(17), Color='blue', SymColor='red', PSym=-16, /Overplot
;       
; :Author:
;    FANNING SOFTWARE CONSULTING::
;        David W. Fanning 
;        1645 Sheely Drive
;        Fort Collins, CO 80526 USA
;        Phone: 970-221-0438
;        E-mail: david@idlcoyote.com
;        Coyote's Guide to IDL Programming: http://www.idlcoyote.com
;
; :History:
;     Change History::
;        Written, 28 February 2012.
;        Modified to make sure both input arguments are defined before call to cgPlot. 25 May 2012. DWF.
;        Typo in the keyword inheritance code cause keywords to be ignorned. Fixed. 5 June 2012. DWF.
;         
; :Copyright:
;     Copyright (c) 2012, Fanning Software Consulting, Inc.
;-
PRO cgOPlot, x, y, $
    ADDCMD=addcmd, $
    CHARSIZE=charsize, $
    COLOR=color, $
    PSYM=psym, $
    SYMCOLOR=symcolor, $
    SYMSIZE=symsize, $
    _REF_EXTRA=extra
    
    ; Sort out which is the dependent and which is independent data.
    CASE N_Params() OF
      
       1: BEGIN
       dep = x
       indep = Findgen(N_Elements(dep))
       ENDCASE
    
       2: BEGIN
       dep = y
       indep = x
       ENDCASE
    
    ENDCASE
    
    ; If either of these input vectors are scalars, make them vectors.
    IF N_Elements(dep) EQ 1 THEN dep = [dep]
    IF N_Elements(indep) EQ 1 THEN indep = [indep]
    
    ; Call the cgPlot command with OVERPLOT set.
    cgPlot, indep, dep, $
        ADDCMD=addcmd, $
        CHARSIZE=charsize, $
        COLOR=color, $
        OVERPLOT=1, $
        PSYM=psym, $
        SYMCOLOR=symcolor, $
        SYMSIZE=symsize, $
        _EXTRA=extra    
        
    END