;+
;
; @file_comments
; Manage axes for the different drawings created by 
; <pro>plt</pro>, <pro>pltz</pro> and <pro>pltt</pro>
;
; @categories
; Graphics
;
; @param COUPE {type=string}
; It designate the type of cut to which the axes we create
; must report. For example: 'xy','xt'...
;
; @param TEMPSMIN {in}{required}
; In the case where we do cut containing the time dimension, we have
; to specify the beginning of the time's axis in julian days.
;
; @param TEMPSMAX {in}{required}
; In the case where we do cut containing the time dimension, we have
; to specify the end of the time's axis in julian days.
;
; @keyword SIN
; activated when we trace in sinus of the latitude
;
; @keyword SEPDATE {type=string}
; It separate the different constituents of the date. By default,
; it is a return to the line when we do a 'yt', 'zt' or a 't'.
; In the other cases, it is a blank.
;
; @keyword DIGITSYEAR
; =2 to use %Z format (2 digits) to code years instead of %Y format (4 digits).
; See <pro>label_date</pro> for more information on %Z and %Y.
;
; @keyword _EXTRA
; Used to pass keywords
;
; @uses
; <pro>common</pro>
;
; @restrictions
; It modify !x. and !y.
;
; @history
; Sebastien Masson (smasson\@lodyc.jussieu.fr)
;                       11/12/98
;                       Eric Guilyardi types x,y,z + amelioration de
;                       l''axe temporel
;
; @version
; $Id$
;
;-
PRO axe, coupe, tempsmin, tempsmax $
       , REVERSE_X=reverse_x, REVERSE_Y=reverse_y, SIN=sin $
       , SEPDATE=sepdate, DIGITSYEAR=digitsyear, _EXTRA=ex
;
  compile_opt idl2, strictarrsubs
;
@common
   tempsun = systime(1)         ; pour key_performance
;--------------------------------------------------------------
; Management of ticks of the time axis in the case of TEMPSMIN
; and TEMPSMAX are defined
;--------------------------------------------------------------
   divday = 0
   if n_params() EQ 3 then BEGIN
;
      if keyword_set(sepdate) then sep = sepdate ELSE $
       if coupe EQ 'yt' OR coupe EQ 'zt' OR coupe EQ 't' then sep = '!C' ELSE sep = ' '
;
      caldat, tempsmin, mmin, dmin, ymin, hmin, mnmin, smin, _EXTRA = ex
      caldat, tempsmax, mmax, dmax, ymax, hmax, mnmax, smax, _EXTRA = ex
; format used for the year (2 or 4/5 digits).
      IF NOT keyword_set(digitsyear) THEN digitsyear = 4
      IF digitsyear EQ 2 THEN fmtyr = '%Z' ELSE fmtyr = '%Y'
;
      CASE 1 OF
; yearly base
        ymin NE 0 AND tempsmax GT julday(mmin, dmin, ymin + 3, hmin, mnmin, smin):BEGIN ; more than 3 years
          CASE 1 OF
          ymax-ymin+1 GT 5000: BEGIN & freq = 500. & tminor = 5 & datfmt = fmtyr & end
          ymax-ymin+1 GT 2000: BEGIN & freq = 200. & tminor = 4 & datfmt = fmtyr & end
          ymax-ymin+1 GT 1000: BEGIN & freq = 100. & tminor = 5 & datfmt = fmtyr & end
          ymax-ymin+1 GT 500: BEGIN & freq = 50. & tminor = 5 & datfmt = fmtyr & end
          ymax-ymin+1 GT 200: BEGIN & freq = 20. & tminor = 4 & datfmt = fmtyr & end
          ymax-ymin+1 GT 100: BEGIN & freq = 10. & tminor = 5 & datfmt = fmtyr & end
          ymax-ymin+1 GT 50: BEGIN & freq = 5. & tminor = 5 & datfmt = '%M'+sep+fmtyr & end
          ymax-ymin+1 GT 20: BEGIN & freq = 4. & tminor = 4 & datfmt = '%M'+sep+fmtyr & end
          ymax-ymin+1 GT 10: BEGIN & freq = 2. & tminor = 4 & datfmt = '%M'+sep+fmtyr & end
          ELSE: BEGIN & freq = 1. & tminor = 4 & datfmt = '%M'+sep+fmtyr & end
          ENDCASE
          nticks = ceil((ymax-ymin)/freq) + 2
          yminf = (floor(ymin/freq))*freq
          ticknom = lonarr(nticks)
          for y = 0, nticks-1 do ticknom[y] = julday(1, 1, yminf + y*freq, _EXTRA = ex)
          ticknom = ticknom[where(ticknom GE tempsmin AND ticknom LE tempsmax, nticks)]
        END
; monthly base
        tempsmax GT julday(mmin + 3, dmin, ymin, hmin, mnmin, smin):BEGIN ; more than 3 months
          CASE 1 OF
            tempsmax GT julday(mmin + 30, dmin, ymin, hmin, mnmin, smin):BEGIN ; more than 30 months -> ticks every 3 months
            freq = 3. & tminor = 3 & END
            tempsmax GT julday(mmin + 16, dmin, ymin, hmin, mnmin, smin):BEGIN ; more than 16 months -> ticks every 2 months
            freq = 2. & tminor = 2 & END
            else:BEGIN          ; monthly ticks
            freq = 1. & tminor = 6 & END
          ENDCASE
          nticks = ceil((mmax + 12*(ymax - ymin) - mmin)/freq) + 2
          mminf = 1 > ((floor(mmin/freq))*freq)
          ticknom = lonarr(nticks)
          for m = 0, nticks-1 do ticknom[m] = julday(mminf + freq*m, 1, ymin, _EXTRA = ex)
          datfmt = '%M'+sep+fmtyr
          ticknom = ticknom[where(ticknom GE tempsmin AND ticknom LE tempsmax, nticks)]
        END
; daily base
        tempsmax GT julday(mmin, dmin + 3, ymin, hmin, mnmin, smin):BEGIN ; more than 3 days
          CASE 1 OF
            tempsmax GT julday(mmin, dmin + 60, ymin, hmin, mnmin, smin):BEGIN ; more than 60 days -> ticks every 7 days
            freq = 7. & tminor = 2 & END
            tempsmax GT julday(mmin, dmin + 30, ymin, hmin, mnmin, smin):BEGIN ; more than 30 days -> ticks every 5 days
            freq = 5. & tminor = 5 & END
            tempsmax GT julday(mmin, dmin + 16, ymin, hmin, mnmin, smin):BEGIN ; more than 16 days -> ticks every 2 days
            freq = 2. & tminor = 2 & END
            ELSE:BEGIN   ; daily ticks
            freq = 1. & tminor = 2 & END
          ENDCASE
          nticks = ceil((tempsmax - tempsmin)/freq) + 2
          dminf = 1 > ((floor(dmin/freq))*freq)
          ticknom = lonarr(nticks)
          for d = 0, nticks-1 do ticknom[d] = julday(mmin, dminf + freq*d, ymin, _EXTRA = ex)
          datfmt = '%D'+sep+'%M'
          ticknom = ticknom[where(ticknom GE tempsmin AND ticknom LE tempsmax, nticks)]
        END
; hourly base
        tempsmax GT julday(mmin, dmin, ymin, hmin + 3, mnmin, smin):BEGIN ; more than 3 hours
          CASE 1 OF
            tempsmax GT julday(mmin, dmin, ymin, hmin + 48, mnmin, smin):BEGIN ; more than 48 hours -> ticks every 6 hours
            freq = 6. & tminor = 3 & datfmt = '%D'+sep+'%H:00' & END
            tempsmax GT julday(mmin, dmin, ymin, hmin + 30, mnmin, smin):BEGIN ; more than 30 hours -> ticks every 4 hours
            freq = 4. & tminor = 2 & datfmt = '%D'+sep+'%H:00' & END
            tempsmax GT julday(mmin, dmin, ymin, hmin + 16, mnmin, smin):BEGIN ; more than 16 hours -> ticks every 2 hours
            freq = 2. & tminor = 2 & datfmt = '%H:00' & END
            ELSE:BEGIN   ; ticks every hour
            freq = 1. & tminor = 2 & datfmt = '%H:00' & END
          ENDCASE
          nticks = ceil((hmax + 24*(dmax - dmin) - hmin)/freq) + 2
          hminf = (floor(hmin/freq))*freq
          ticknom = dblarr(nticks)
          for h = 0, nticks-1 do ticknom[h] = julday(mmin, dmin, ymin, hminf + freq*h, 0, 0, _EXTRA = ex)
          ticknom = ticknom[where(ticknom GE tempsmin AND ticknom LE tempsmax, nticks)]
        END
; minute base
        tempsmax GT julday(mmin, dmin, ymin, hmin, mnmin + 3, smin):BEGIN ; more than 3 minutes
          CASE 1 OF
            tempsmax GT julday(mmin, dmin, ymin, hmin, mnmin + 120, smin):BEGIN ; more than 120 minutes -> ticks every 10 minutes
            freq = 10. & tminor = 2 & END
            tempsmax GT julday(mmin, dmin, ymin, hmin, mnmin + 60, smin):BEGIN ; more than 60 minutes -> ticks every 6 minutes
            freq = 6. & tminor = 3 & END
            tempsmax GT julday(mmin, dmin, ymin, hmin, mnmin + 30, smin):BEGIN ; more than 30 minutes -> ticks every 4 minutes
            freq = 4. & tminor = 2 & END
            tempsmax GT julday(mmin, dmin, ymin, hmin, mnmin + 15, smin):BEGIN ; more than 15 minutes -> ticks every 2 minutes
            freq = 2. & tminor = 2 & END
            ELSE:BEGIN   ; ticks every minutes
            freq = 1. & tminor = 2 & END
          ENDCASE
          nticks = ceil((mnmax + 60*(hmax - hmin) - mnmin)/freq) + 2
          mnminf = (floor(mnmin/freq))*freq
          ticknom = dblarr(nticks)
          for mn = 0, nticks-1 do ticknom[mn] = julday(mmin, dmin, ymin, hmin, mnminf + freq*mn, 0, _EXTRA = ex)
          ticknom = ticknom[where(ticknom GE tempsmin AND ticknom LE tempsmax, nticks)]
          datfmt = '%H:%I'
        END
; second base
        ELSE:BEGIN ; less than 3 minutes
          CASE 1 OF
            tempsmax GT julday(mmin, dmin, ymin, hmin, mnmin, smin + 120):BEGIN ; more than 120 seconds -> ticks every 20 seconds
            freq = 20. & tminor = 2 & datfmt = '%H:%I:%S' & END
            tempsmax GT julday(mmin, dmin, ymin, hmin, mnmin, smin + 60):BEGIN ; more than 60 seconds -> ticks every 15 seconds
            freq = 15. & tminor = 3 & datfmt = '%H:%I:%S' & END
            tempsmax GT julday(mmin, dmin, ymin, hmin, mnmin, smin + 30):BEGIN ; more than 30 seconds -> ticks every 10 seconds
            freq = 10. & tminor = 2 & datfmt = '%H:%I:%S' & END
            tempsmax GT julday(mmin, dmin, ymin, hmin, mnmin, smin + 15):BEGIN ; more than 15 seconds -> ticks every 4 seconds
            freq = 4. & tminor = 4 & datfmt = '%H:%I:%S' & END
            tempsmax GT julday(mmin, dmin, ymin, hmin, mnmin, smin + 7):BEGIN ; more than 7 seconds -> ticks every 2 seconds
            freq = 2. & tminor = 2 & datfmt = '%H:%I:%S' & END
            ELSE:BEGIN   ; ticks every minutes
            freq = 1. & tminor = 2 & datfmt = '%H:%I:%S' & END
          ENDCASE
          nticks = ceil((smax + 60*(mnmax - mnmin) - smin)/freq) + 2
          sminf = (floor(smin/freq))*freq
          ticknom = dblarr(nticks)
          for s = 0, nticks-1 do ticknom[s] = julday(mmin, dmin, ymin, hmin, mnmin, sminf + freq*s, _EXTRA = ex)
          ticknom = ticknom[where(ticknom GE tempsmin AND ticknom LE tempsmax, nticks)]
        END
      ENDCASE
      dummy = label_date(0, 0, 0, DATE_FORMAT = datfmt, _EXTRA = ex)
      if chkstru(ex, 'DATE_FORMAT') then ex.DATE_FORMAT = ''
   ENDIF
;--------------------------------------------------------------
; Definition of axes parameters case by case
;--------------------------------------------------------------
   case coupe of
      'pltv':BEGIN
        dtasize = tempsmin
         !x.range = [-0.5, dtasize[0] - 0.5]
         !y.range = [-0.5, dtasize[1] - 0.5]
         if keyword_set(reverse_x) then !x.range=reverse(!x.range)
         if keyword_set(reverse_y) then !y.range=reverse(!y.range)
         !x.title = 'nx'
         !y.title = 'ny'
      END
      'xy':BEGIN
         if keyword_set(reverse_x) then !x.range=[lon2,lon1] ELSE !x.range=[lon1,lon2]
         if keyword_set(reverse_y) then !y.range=[lat2,lat1] ELSE !y.range=[lat1,lat2]
         IF key_onearth THEN !x.tickformat='lonaxe'
         IF key_onearth THEN !y.tickformat='lataxe'
      END
      'yz':BEGIN
         if keyword_set(reverse_x) then !x.range=[lat2,lat1] ELSE !x.range=[lat1,lat2]
         if keyword_set(reverse_y) then !y.range=[0, -1] ELSE !y.range = [-1, 0]
         if keyword_set(sin) then BEGIN
; number of ticks by default
            plot, [0], [0], /noerase, /nodata, xtick_get = xaxe
; We increase this number to it be around 10
            ticks = n_elements(xaxe)-1
            ticks = ticks*[1, 2, 4, 8]
            ticks = ticks[(sort(abs(ticks-10)))[0]]
; We recuperate the x axis for this new number of ticks
            plot, [0], [0],xticks = ticks, /noerase, /nodata, xtick_get = xaxe
            !x.ticks = ticks
            !x.tickv = sin(!pi/180.*xaxe)
            tickname = strarr(ticks+1)
            for i = 0,ticks do tickname[i] = lataxe(0, 0, xaxe[i])
            !x.tickname = tickname
            !x.range = sin(!pi/180.*!x.range)
         endif
      end
      'xz':BEGIN
         if keyword_set(reverse_x) then !x.range=[lon2,lon1] ELSE !x.range=[lon1,lon2]
         if keyword_set(reverse_y) then !y.range=[0, -1] ELSE !y.range = [-1, 0]
      end
      'xt' : begin
         if keyword_set(reverse_x) then !x.range = [lon2,lon1] ELSE !x.range=[lon1,lon2]
         if keyword_set(reverse_y) then !y.range=[tempsmax, tempsmin]-tempsmin $
         ELSE !y.range=[tempsmin,tempsmax]-tempsmin
         IF key_onearth THEN !x.tickformat='lonaxe'
;          result = LABEL_DATE(DATE_FORMAT = '%M'+sep+fmtyr)
;          !y.tickformat='LABEL_DATE'
         !y.tickname = LABEL_DATE(1, 0,ticknom,_EXTRA = ex)
         !y.ticklen=1.
         !y.gridstyle=2
         !y.ticks=nticks-1
         !y.tickv=ticknom-tempsmin
         !y.minor=tminor
         IF divday GT 0 THEN !y.title = 'Time from '+strtrim(dmin,1)+' ' $
          +def_month('1m', strtrim(mmin, 1))+' '+strtrim(ymin,1)
      end
      'yt' : begin
         if keyword_set(reverse_x) then !x.range = [tempsmax,tempsmin]-tempsmin $
         ELSE !x.range=[tempsmin,tempsmax]-tempsmin
         if keyword_set(reverse_y) then !y.range=[lat2, lat1] ELSE !y.range=[lat1,lat2]
         IF key_onearth THEN !y.tickformat='lataxe'
         !x.tickname = LABEL_DATE(0, 0,ticknom,_EXTRA = ex)
         !x.ticklen=1.
         !x.gridstyle=2
         !x.ticks=nticks-1
         !x.tickv=ticknom-tempsmin
         !x.minor=tminor
         IF divday GT 0 THEN !y.title = 'Time from '+strtrim(dmin,1)+' ' $
          +def_month('1m', strtrim(mmin, 1))+' '+strtrim(ymin,1)
      end
      'zt' : begin
         if keyword_set(reverse_x) then !x.range = [tempsmax,tempsmin]-tempsmin $
         ELSE !x.range=[tempsmin,tempsmax]-tempsmin
         if vargrid EQ 'W' then gdep=gdepw[0:nzw-1] ELSE gdep=gdept[0:nzt-1]
         !x.tickname = LABEL_DATE(0, 0,ticknom,_EXTRA = ex)
         !x.ticklen=1.
         !x.gridstyle=2
         !x.ticks=nticks-1
         !x.tickv=ticknom-tempsmin
         !x.minor=tminor
         IF divday GT 0 THEN !y.title = 'Time from '+strtrim(dmin,1)+' ' $
          +def_month('1m', strtrim(mmin, 1))+' '+strtrim(ymin,1)
      end
      't' : BEGIN
         if keyword_set(reverse_x) then !x.range = [tempsmax,tempsmin]-tempsmin $
         ELSE !x.range=[tempsmin,tempsmax]-tempsmin
         !x.tickname = LABEL_DATE(0, 0,ticknom,_EXTRA = ex)
         !x.ticklen=1.
         !x.gridstyle=2
         !x.ticks=nticks-1
         !x.tickv=ticknom-tempsmin
         !x.minor=tminor
         IF divday GT 0 THEN !y.title = 'Time from '+strtrim(dmin,1)+' ' $
          +def_month('1m', strtrim(mmin, 1))+' '+strtrim(ymin,1)
      end
      'x' : begin
         !x.range=[lon1,lon2]
         IF key_onearth THEN !x.tickformat='lonaxe'
      END
      'y' : begin
         if keyword_set(sin) then BEGIN
; Number of ticks by default
            plot, [0], [0], /nodata, /noerase, xstyle = 5, ystyle = 5, xtick_get = xaxe
; We increase this number to it be around 10
            ticks = n_elements(xaxe)-1
            ticks = ticks*[1, 2, 4, 8]
            ticks = ticks[(sort(abs(ticks-10)))[0]]
; We recuperate the x axis for this new number of ticks
            plot, [0], [0],xticks = ticks,/nodata,/noerase,xstyle=5,ystyle=5,xtick_get=xaxe
            !x.ticks = ticks
            !x.tickv = sin(!pi/180.*xaxe)
            tickname = strarr(ticks+1)
            for i = 0,ticks do tickname[i] = lataxe(0, 0, xaxe[i])
            !x.tickname = tickname
            !x.range = sin(!pi/180.*!x.range)
         ENDIF ELSE !x.range=[lat1,lat2]
         IF key_onearth THEN !x.tickformat='lataxe'
      END
      'z' : begin
;          if vargrid EQ 'W' then gdep=gdepw[0:nzw-1] ELSE gdep=gdept[0:nzt-1]
;          if keyword_set(reverse_y) then !y.range=[gdep[0], gdep[n_elements(gdep)-1]] $
;          ELSE !y.range=[gdep[n_elements(gdep)-1], gdep[0]]
      END
   endcase
   if keyword_set(key_performance) THEN print, 'temps axe', systime(1)-tempsun
   return
end