; Chris Gutteridge (cjg@ecs.soton.ac.uk)
; At ECS Dept, University of Southampton, England.

; This program is free software; you can redistribute it and/or modify
; it under the terms of the GNU General Public License as published by
; the Free Software Foundation; either version 2 of the License, or
; (at your option) any later version.
; 
; This program is distributed in the hope that it will be useful,
; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
; GNU General Public License for more details.
; 
; You should have received a copy of the GNU General Public License
; along with this program; if not, write to the Free Software
; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.


(define (script-fu-coffee-stain inImage
				inLayer
				inNumber
				inDark)

   (set! old-gradient (car (gimp-gradients-get-gradient)))
   (set! theImage inImage)
   (set! theHeight (car (gimp-image-height theImage)))
   (set! theWidth (car (gimp-image-width theImage)))
   (set! theNumber inNumber)
   (set! theSize (min theWidth theHeight))

   (gimp-image-undo-group-start theImage)

   (while (> theNumber 0)
	  (set! theNumber (- theNumber 1))
	  (set! theStain (car (gimp-layer-new theImage theSize theSize
					      RGBA-IMAGE "Stain" 100
					      (if (= inDark TRUE)
						  DARKEN-ONLY-MODE NORMAL-MODE))))

	  (gimp-image-add-layer theImage theStain 0)
	  (gimp-selection-all theImage)
	  (gimp-edit-clear theStain)

	  (let ((blobSize (/ (rand (- theSize 40)) (+ (rand 3) 1))))
            (gimp-ellipse-select theImage
				 (/ (- theSize blobSize) 2)
				 (/ (- theSize blobSize) 2)
				 blobSize blobSize CHANNEL-OP-REPLACE TRUE 0 FALSE))

	  (script-fu-distress-selection theImage theStain
					(* (+ (rand 15) 1) (+ (rand 15) 1))
					(/ theSize 25) 4 2 TRUE TRUE)

	  (gimp-gradients-set-gradient "Coffee")

	  (gimp-edit-blend theStain CUSTOM-MODE NORMAL-MODE
			   GRADIENT-SHAPEBURST-DIMPLED 100 0 REPEAT-NONE FALSE
			   FALSE 0 0 TRUE
			   0 0 0 0)

	  (gimp-layer-set-offsets theStain
				  (- (rand theWidth) (/ theSize 2))
				  (- (rand theHeight) (/ theSize 2)) theSize))

   (gimp-selection-none theImage)

   (gimp-image-undo-group-end theImage)

   (gimp-gradients-set-gradient old-gradient)
   (gimp-displays-flush))

; Register the function with the GIMP:

(script-fu-register "script-fu-coffee-stain"
		    _"<Image>/Script-Fu/Decor/_Coffee Stain..."
		    "Draws realistic looking coffee stains"
		    "Chris Gutteridge"
		    "1998, Chris Gutteridge / ECS dept, University of Southampton, England."
		    "25th April 1998"
		    "RGB*"
		    SF-IMAGE       "The Image" 0
		    SF-DRAWABLE    "The Layer" 0
		    SF-ADJUSTMENT _"Stains"    '(3 1 10 1 1 0 0)
		    SF-TOGGLE     _"Darken Only\n(Better, but only for Images with alot of White)" TRUE)