; FU_artist_inkpen.scm
; version 2.9 [gimphelp.org] 
; last modified/tested by Paul Sherman
; 02/15/2014 on GIMP-2.8.10
;
; 02/13/2014 - work with non-rgb, merge option and install info added
;==============================================================
;
; Installation:
; This script should be placed in the user or system-wide script folder.
;
;	Windows Vista/7/8)
;	C:\Program Files\GIMP 2\share\gimp\2.0\scripts
;	or
;	C:\Users\YOUR-NAME\.gimp-2.8\scripts
;	
;	Windows XP
;	C:\Program Files\GIMP 2\share\gimp\2.0\scripts
;	or
;	C:\Documents and Settings\yourname\.gimp-2.8\scripts   
;    
;	Linux
;	/home/yourname/.gimp-2.8/scripts  
;	or
;	Linux system-wide
;	/usr/share/gimp/2.0/scripts
;
;==============================================================
;
; LICENSE
;
;    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 3 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, see <http://www.gnu.org/licenses/>.
;
;==============================================================
; Original information 
;
; Inkpen script  for GIMP 2.2
; Copyright (C) 2007 Eddy Verlinden <eddy_verlinden@hotmail.com>
;==============================================================

(define (FU-inkpen
        img
        drawable
        color
        lightness
        length
        outlines?
        grid?
        inMerge
    )
    (gimp-image-undo-group-start img)
    (if (not (= RGB (car (gimp-image-base-type img))))
            (gimp-image-convert-rgb img))
  (let* (
            (width (car (gimp-drawable-width drawable)))
            (height (car (gimp-drawable-height drawable)))
            (old-selection (car (gimp-selection-save img)))
            (image-type (car (gimp-image-base-type img)))
            (blur (* height  0.01 ))
            (gridcolor '(128 128 255))
            (layer-type (car (gimp-drawable-type drawable)))
            (layer-tempa (car (gimp-layer-new img width height layer-type "tempa"  100 LAYER-MODE-NORMAL)))
            (layer-tempb (car (gimp-layer-new img width height layer-type "tempb"  100 LAYER-MODE-NORMAL)))
            (layer-tempc (car (gimp-layer-new img width height layer-type "tempc"  100 LAYER-MODE-NORMAL)))
            (layer-tempd (car (gimp-layer-new img width height layer-type "tempd"  100 LAYER-MODE-NORMAL)))
            (layer-tempe (car (gimp-layer-new img width height layer-type "tempe"  100 LAYER-MODE-NORMAL)))
            (layer-tempf (car (gimp-layer-new img width height layer-type "tempf"  100 LAYER-MODE-NORMAL)))
            (layer-tempg (car (gimp-layer-new img width height layer-type "tempg"  100 LAYER-MODE-NORMAL)))
        ) 
        
    (if (eqv? (car (gimp-selection-is-empty img)) TRUE)
        (gimp-drawable-fill old-selection FILL-WHITE)) ; so Empty and All are the same.
    (gimp-selection-none img)
    
    
    (gimp-drawable-fill layer-tempb FILL-WHITE)
    (gimp-image-insert-layer img layer-tempb 0 -1)
    (gimp-edit-copy drawable)
    (gimp-floating-sel-anchor (car (gimp-edit-paste layer-tempb 0)))
    ;(gimp-hue-saturation layer-tempb 0 0 lightness 0)
    (gimp-drawable-hue-saturation layer-tempb HUE-RANGE-ALL 0 lightness 0 0)
    ;(gimp-threshold layer-tempb 125 255)
     (gimp-drawable-threshold layer-tempb HISTOGRAM-VALUE 0.47 1.0) ; 
    
    (gimp-drawable-fill layer-tempa FILL-WHITE)
    (gimp-image-insert-layer img layer-tempa 0 -1)
    (plug-in-randomize-hurl 1 img layer-tempa 25 1 1 10)
    (plug-in-mblur 1 img layer-tempa 0 length 135 1 0)
    ;(gimp-threshold layer-tempa 215 230)
    (gimp-drawable-threshold layer-tempa HISTOGRAM-VALUE 0.843 0.901)
    
    (gimp-drawable-fill layer-tempd FILL-WHITE)
    (gimp-image-insert-layer img layer-tempd 0 -1)
    (gimp-edit-copy drawable)
    (gimp-floating-sel-anchor (car (gimp-edit-paste layer-tempd 0)))
    ;(gimp-hue-saturation layer-tempd 0 0 lightness 0)
    (gimp-drawable-hue-saturation layer-tempd HUE-RANGE-ALL 0 lightness 0 0)
    ;(gimp-threshold layer-tempd 75 255)
    (gimp-drawable-threshold layer-tempd HISTOGRAM-VALUE 0.294 1.0) 
    
    (gimp-drawable-fill layer-tempc FILL-WHITE)
    (gimp-image-insert-layer img layer-tempc 0 -1)
    (plug-in-randomize-hurl 1 img layer-tempc 25 1 1 10)
    (plug-in-mblur 1 img layer-tempc 0 length 45 0 0)
    ;(gimp-threshold layer-tempc 215 230)
    (gimp-drawable-threshold layer-tempc HISTOGRAM-VALUE 0.843 0.901)
    
    (gimp-layer-set-mode layer-tempa 10)
    (gimp-layer-set-mode layer-tempc 10)
    
    (gimp-image-merge-down img layer-tempc 0)
    (set! layer-tempc (car (gimp-image-get-active-layer img)))
    (gimp-layer-set-mode layer-tempc 3)
    
    (gimp-image-merge-down img layer-tempa 0)
    (set! layer-tempa (car (gimp-image-get-active-layer img)))
    (gimp-layer-set-mode layer-tempa 0)
    
    
    (gimp-image-merge-down img layer-tempc 0)
    (set! layer-tempa (car (gimp-image-get-active-layer img)))
    (gimp-layer-set-mode layer-tempa 0)
    ;------------------------------------------------
    (if (eqv? outlines? TRUE)
        (begin
            (gimp-image-insert-layer img layer-tempe 0 -1)
            (gimp-edit-copy drawable)
            (gimp-floating-sel-anchor (car (gimp-edit-paste layer-tempe 0)))
            (plug-in-photocopy 1 img layer-tempe 5.0 1.0 0.0 0.8)
            (gimp-levels layer-tempe 0 215 235 1.0 0 255) 
            (gimp-layer-set-mode layer-tempe 3)
            (gimp-image-merge-down img layer-tempe 0)
            (set! layer-tempa (car (gimp-image-get-active-layer img)))
        )
    )
    ;------------------------------------------------
    (gimp-context-set-foreground color)
    (gimp-drawable-fill layer-tempf 0)
    (gimp-image-insert-layer img layer-tempf 0 -1)
    (gimp-layer-set-mode layer-tempf 4)
    (gimp-image-merge-down img layer-tempf 0)
    (set! layer-tempa (car (gimp-image-get-active-layer img)))
    
    ;------------------------------------------------
    (if (eqv? grid? TRUE)
        (begin
            (gimp-drawable-fill layer-tempg FILL-WHITE)
            (gimp-image-insert-layer img layer-tempg 0 -1)
            (gimp-image-lower-item img layer-tempg)
            (plug-in-grid 1 img layer-tempg 1 16 8 gridcolor 64 1 16 8 gridcolor 64 0 2 6 gridcolor 128)
            (plug-in-gauss 1 img layer-tempg 0.5 0.5 0)
            
            (gimp-layer-set-mode layer-tempa 9)
            (gimp-image-merge-down img layer-tempa 0)
            (set! layer-tempa (car (gimp-image-get-active-layer img)))
        )
    )
    ;------------------------------------------------
    
    (gimp-image-select-item img CHANNEL-OP-REPLACE old-selection)
    (gimp-selection-invert img)
    (if (eqv? (car (gimp-selection-is-empty img)) FALSE) ; both Empty and All are denied
        (begin
            (gimp-edit-clear layer-tempa)
        )
    )
    
    (gimp-item-set-name layer-tempa "Inkpen")
    (gimp-image-select-item img CHANNEL-OP-REPLACE old-selection)
    (gimp-image-remove-channel img old-selection)
    
    (if (= inMerge TRUE)(gimp-image-merge-visible-layers img EXPAND-AS-NECESSARY))
    (gimp-image-undo-group-end img)
    (gimp-displays-flush)
  )
)

(script-fu-register "FU-inkpen"
    "<Toolbox>/Script-Fu/Artist/Inkpen"
    "Creates a inkpen drawing effect \nfile:FU_artist_inkpen.scm"
    "Eddy Verlinden <eddy_verlinden@hotmail.com>"
    "Eddy Verlinden"
    "2007, juli"
    "*"
    SF-IMAGE      "Image"	                        0
    SF-DRAWABLE   "Drawable"                        0
    SF-COLOR      "Ink Color"                       '(0 0 0)
    SF-ADJUSTMENT "Lightness"                       '(0 -100 100 1 10 0 0)
    SF-ADJUSTMENT "Stroke length"                   '(30 10 50 1 10 0 0)
    SF-TOGGLE     "Outlines"                        TRUE
    SF-TOGGLE     "Blue grid"                       FALSE
    SF-TOGGLE     "Merge layers when complete?"     FALSE
)

; end of script