;+
; @file_comments
;
; @categories
;
; @param MASK
;
; @param XF
;
; @param YF
;
; @param NX
;
; @param NY
;
; @keyword COAST_COLOR {default=0}
; The color of the coastline.
; Default is black (0).
;
; @keyword COAST_THICK {default=1}
; The thick of the trait to trace continents
;
; @keyword XSEUIL {default=5}
; To eliminate segments of coasts which are to big (which link points which can
; be close on the sphere but distant on the drawing). We delete all segments
; whose the size surpass the size of the window following X/XSEUIL.
; But it can be to big if we do a big zoom or a little one for some
; projections... We specify it the keyword thanks to this keyword!
;
; @keyword YSEUIL
; See XSEUIL
;
; @keyword _EXTRA
; Used to pass keywords
;
; @returns
;
; @uses
;
; @restrictions
;
; @examples
;
; @history
;
; @version
;
; @todo
; Seb: remplir le header
;
;-
PRO drawcoast_e, mask, xf, yf, nx, ny, COAST_COLOR = coast_color, COAST_THICK = coast_thick, YSEUIL = yseuil, XSEUIL = xseuil, ONEMORE = onemore, _EXTRA = ex
;
  compile_opt idl2, strictarrsubs
;
@cm_4mesh
  IF NOT keyword_set(key_forgetold) THEN BEGIN
@updatenew
@updatekwd
  ENDIF
;---------------------------------------------------------
   tempsun = systime(1)         ; pour key_performance
;---------------------------------------------------------
   if keyword_set(key_periodic) AND nx EQ jpi then begin
      mask = [mask, mask[0, *]]
      xf = [xf, xf[0, *]]
      yf = [yf, yf[0, *]]
      nx = nx+1
   ENDIF
;
; we plot the borders of the diamond in this sense : \
;
   if NOT keyword_set(onemore) then onemore = 0
   if NOT keyword_set(xseuil) then xseuil = 5. < (min([nx, ny])-2)
   distanceseuil = (!p.position[2]-!p.position[0])/xseuil
; liste: liste des points i pour lesquels on va tracer un segment
   index = lindgen(nx, ny)
   index = index[0:nx-2, 1:ny-1]
   indexbis = index-nx+((index/nx+onemore) MOD 2)
   liste = where(mask[index+1]+mask[indexbis] EQ 1 $
                 AND (xf[index]-xf[indexbis])^2+(yf[index]-yf[indexbis])^2 LE distanceseuil^2)
   IF liste[0] NE -1 THEN BEGIN
      index = index[liste]
      indexbis = indexbis[liste]
      for pt = 0, n_elements(index)-1 do begin
         plots, [xf[index[pt]], xf[indexbis[pt]]], [yf[index[pt]], yf[indexbis[pt]]] $
           , color = coast_color, thick = coast_thick, /normal, _extra = ex
      endfor
   ENDIF
;
; we plot the borders of the diamond in this sense : /
;
   if NOT keyword_set(xseuil) then xseuil = 5. < (min([nx, ny])-2)
   distanceseuil = (!p.position[2]-!p.position[0])/xseuil
; liste: liste des points i pour lesquels on va tracer un segment
   index = lindgen(nx, ny-1)
   index = index[0:nx-2, *]
   indexbis = index+nx+((index/nx+onemore) MOD 2)
   liste = where(mask[index+1]+mask[indexbis] EQ 1 $
                 AND (xf[index]-xf[indexbis])^2+(yf[index]-yf[indexbis])^2 LE distanceseuil^2)
   IF liste[0] NE -1 THEN BEGIN
      index = index[liste]
      indexbis = indexbis[liste]
      for pt = 0, n_elements(index)-1 do begin
         plots, [xf[index[pt]], xf[indexbis[pt]]], [yf[index[pt]], yf[indexbis[pt]]] $
           , color = coast_color, thick = coast_thick, /normal, _extra = ex
      endfor
   ENDIF

;---------------------------------------------------------
   if keyword_set(key_performance) THEN print, 'temps drawcoast_e', systime(1)-tempsun
   return
end