; Border Guides
; This script creates guides along the border of the canvas, offset by the 
; user specified amount.
(define (script-fu-border-guides image x y)

   (let*
      (
	      (height (car (gimp-image-height image)))
	      (width (car (gimp-image-width image)))
      )

      (gimp-context-push) ; Initiates the temporary state.

      (if (or (< x 0) (< y 0))
         (gimp-message "X and Y must be less than the canvas mid-point") ; TRUE
         (if (and (< x (/ width 2)) (< y (/ height 2)))
            (add-guides image x y height width) ; TRUE
            (gimp-message "X and Y must be less than the canvas mid-point") ; FALSE
         ); Close If
      ); Close If

      ; Deactivates the temporary state and resets the previous user defaults.
      (gimp-context-pop) 
      (gimp-displays-flush)
   )
)

; add-guides
; Adds the guides to the image
(define (add-guides image x y height width)
   (gimp-image-add-hguide image y)
   (gimp-image-add-hguide image (- height y))

   (gimp-image-add-vguide image x)
   (gimp-image-add-vguide image (- width x))
)

; Finally register our script with script-fu.
(script-fu-register
   "script-fu-border-guides"                   ;func name
   "Border Guides"                             ;menu label
   ;description
   "Create guides offset from the edge of the canvas" 
   "Jeffrey Boulais"                           ;author
   "copyright 2009, Jeffrey Boulais"           ;copyright notice
   "October 13, 2009"                          ;date created
   "RGB* GRAY* INDEXED*"                       ;image type that the script works on
   SF-IMAGE "Image" 0
   SF-VALUE "X Offset (px)" "0"
   SF-VALUE "Y Offset (px)" "0"
)
(script-fu-menu-register "script-fu-border-guides" "<Image>/Image/Guides")