;+
;
; @file_comments
;
; @categories
;
; @returns
;
; @keyword dpi {in}{optional}{type=scalar}{default=72}
; used only in z buffer. specify the number of dots per inch.
; used to define the size of the virtual window activated in the Z buffer.
;
; @keyword _EXTRA
; Used to pass keywords
;
; @uses
;
; @restrictions
;
; @examples
;
; @history
;
; @version
; $Id$
;
; @todo seb
;-
FUNCTION givewindowsize, dpi = dpi, _extra = ex
;
  compile_opt idl2, strictarrsubs
;
@cm_4ps
IF NOT keyword_set(key_forgetold) THEN BEGIN
@updatenew
ENDIF
;------------------------------------------------------------
;
   IF !d.name EQ 'Z' THEN BEGIN
     IF NOT keyword_set(dpi) THEN dpi = 72
     coef = dpi/2.54 ; 1 inch = 2.54 cm
   ENDIF ELSE BEGIN
     dimensions = get_screen_size(RESOLUTION = resolution)
     coef = floor(1./resolution[0])
   ENDELSE
   if NOT keyword_set(windowsize_scale) then BEGIN
     windowsize_scale = 1.
     IF NOT keyword_set(key_forgetold) THEN BEGIN
     @updateold
     ENDIF
   ENDIF
   coef = windowsize_scale * coef
   IF n_elements(coef EQ 1) THEN coef = [coef, coef]
;
    mipgsz = min(page_size, max = mapgsz)
;
    xsize = coef[0] * (mipgsz*key_portrait + mapgsz*(1-key_portrait))
    ysize = coef[1] * (mipgsz*(1-key_portrait) + mapgsz*key_portrait)
;
   return, [xsize, ysize]
end