;+
;
; @file_comments
; Determine the min and the max of a mask array
;
; @categories
; Plotting
;
; @param TAB {in}{required}
; The array whose we determine the min and the max
;
; @param MASK {in}{required}
; The mask array
;
; @keyword MININ {type=scalar}
; If it is not defined, it takes the value of VRAIMIN
;
; @keyword MAXIN {type=scalar}
; If it is not defined, it takes the value of VRAIMAX
;
; @keyword ZEROMIDDLE
; Force the middle of the colorbar to be equal
; to 0 (force max=max(abs([min,max])) and min=-max)
;
; @keyword _EXTRA
; Used to pass keywords
;
; @keyword USETRI
; To force using triangulation.
;
; @param VRAIMIN {out}
; The min of the array
;
; @param VRAIMAX {out}
; The max of the array
;
; @uses
; Common.pro
;
; @restrictions
; Look if the field is constant on the sea
;
; @history
; Sebastien Masson (smasson\@lodyc.jussieu.fr)
;                       11/12/98
;
; @version
; $Id$
;
; @todo seb: manque les param glam et gphi
;
;-
;
PRO determineminmax, tab, mask, vraimin, vraimax, glam, gphi, MAXIN = maxin, MININ = minin, INTERVALLE = intervalle, USETRI = usetri, ZEROMIDDLE = zeromiddle, _EXTRA = ex
;
  compile_opt idl2, strictarrsubs
;
@common
;
; Type of the vertical grid:
  if vargrid EQ 'W' then nz = nzw ELSE nz = nzt
; liste des points mer
  if (size(mask))[0] EQ 3 then mer = mask[*, *, 0] $
  ELSE mer = mask
; If key_irregular eq 1, we mask also points which are not in the geographic
; domain defined by lon1,lon2,lat1,lat2
  if keyword_set(key_irregular) AND n_elements(glam) NE 0 AND n_elements(gphi) NE 0 then begin
    dom =   where(glam LT lon1 OR glam GT lon2 OR gphi LT lat1 OR gphi GT lat2)
    if dom[0] NE -1 then mer[dom] = 0
  endif
;
  mer = where(mer eq 1)
;
  if mer[0] eq -1 then begin
    ras = report('Il n''y a que de la terre sur le dessin!')
    vraimax = 0
    vraimin = 0
    maxin = vraimax+1
    minin = vraimin-1
    usetri = 0
    return
  endif
; ma and mi : max and min on ocean points
  vraimax = max(tab[mer], min = vraimin, _extra = ex)
  sameminmax = testvar(var = minin) EQ testvar(var = maxin)
  if n_elements(maxin) EQ 0 OR sameminmax then maxin = vraimax
  if n_elements(minin) EQ 0 OR sameminmax then BEGIN
    if keyword_set(intervalle) then minin = floor(vraimin/intervalle)*intervalle $
    ELSE minin = vraimin
  endif
  if vraimin eq vraimax then BEGIN
    IF size(vraimin, /type) EQ 1 THEN vraimin = fix(vraimin)
    question = ['Warning: constant filed, same value everywhere : ' + strtrim(vraimin, 2) +'!', 'Shall we make the plot?']
    answer = report(question, /default_no, /question)
    if answer then begin
      maxin = vraimax+1
      minin = vraimin-1
    endif ELSE tab = -1
  ENDIF
  IF keyword_set(zeromiddle) THEN BEGIN
      maxin = max(abs([minin, maxin]))
      minin = -maxin
  ENDIF


  return
end