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truchet.scm
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2009-12-15
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; GIMP - The GNU Image Manipulation Program
; Copyright (C) 1995 Spencer Kimball and Peter Mattis
;
; 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.
;
; Truchet - a script to create Truchet patterns
; by Adrian Likins <aklikins@eos.ncsu.edu>
; http://www4.ncsu.edu/~aklikins/
; version about .8 give or take
;
; Lots of thanks to Quartic for his help.
;
;
; The utility of this script is left as an exercise for the reader.
;
; NOTE: This script works best with even values for 'thickness'.
(define (center-ellipse img cx cy rx ry op aa feather frad)
(gimp-ellipse-select img (- cx rx) (- cy ry) (+ rx rx ) (+ ry ry )
op aa feather frad)
)
(define (use-tiles img drawable height width img2 drawable2 xoffset yoffset)
(gimp-edit-copy drawable2)
(let ((floating-sel (car (gimp-edit-paste drawable FALSE))))
(gimp-layer-set-offsets floating-sel xoffset yoffset)
(gimp-floating-sel-anchor floating-sel)
)
)
(define (create-tiles img drawable1 drawable2 size thickness backcolor forecolor)
(let* (
(half-thickness (/ thickness 2))
(outer-radius (+ (/ size 2) half-thickness))
(inner-radius (- (/ size 2) half-thickness))
)
(gimp-selection-all img)
(gimp-context-set-background backcolor)
(gimp-edit-fill drawable1 BACKGROUND-FILL)
(let* (
(tempSize (* size 3))
(temp-img (car (gimp-image-new tempSize tempSize RGB)))
(temp-draw (car (gimp-layer-new temp-img tempSize tempSize RGB-IMAGE "Jabar" 100 NORMAL-MODE)))
)
(gimp-image-undo-disable temp-img)
(gimp-image-add-layer temp-img temp-draw 0)
(gimp-context-set-background backcolor)
(gimp-edit-fill temp-draw BACKGROUND-FILL)
(center-ellipse temp-img size size outer-radius outer-radius CHANNEL-OP-REPLACE TRUE FALSE 0)
(center-ellipse temp-img size size inner-radius inner-radius CHANNEL-OP-SUBTRACT TRUE FALSE 0)
(center-ellipse temp-img (* size 2) (* size 2) outer-radius outer-radius CHANNEL-OP-ADD TRUE FALSE 0)
(center-ellipse temp-img (* size 2) (* size 2) inner-radius inner-radius CHANNEL-OP-SUBTRACT TRUE FALSE 0)
(gimp-context-set-background forecolor)
(gimp-edit-fill temp-draw BACKGROUND-FILL)
(gimp-selection-none temp-img)
(gimp-image-resize temp-img size size (- size) (- size))
; woo hoo it works....finally...
(gimp-selection-all temp-img)
(gimp-edit-copy temp-draw)
(let ((floating-sel (car (gimp-edit-paste drawable2 FALSE))))
(gimp-floating-sel-anchor floating-sel))
(let ((floating-sel (car (gimp-edit-paste drawable1 FALSE))))
(gimp-floating-sel-anchor floating-sel))
(let ((drawble (car (gimp-drawable-transform-flip-simple drawable1
ORIENTATION-VERTICAL TRUE 0 TRUE)))))
;(gimp-display-new temp-img)
(gimp-image-delete temp-img)
)
)
)
(define (script-fu-truchet size thickness backcolor forecolor xtiles ytiles)
(let* (
(width (* size xtiles))
(height (* size ytiles))
(img (car (gimp-image-new width height RGB)))
(tile (car (gimp-image-new size size RGB)))
(layer-one (car (gimp-layer-new img width height
RGB-IMAGE "Rambis" 100 NORMAL-MODE)))
(tiledraw1 (car (gimp-layer-new tile size size
RGB-IMAGE "Johnson" 100 NORMAL-MODE)))
(tiledraw2 (car (gimp-layer-new tile size size
RGB-IMAGE "Cooper" 100 NORMAL-MODE)))
(Xindex 0)
(Yindex 0)
)
(gimp-context-push)
(gimp-image-undo-disable img)
(gimp-image-undo-disable tile)
(gimp-image-add-layer img layer-one 0)
(gimp-image-add-layer tile tiledraw1 0)
(gimp-image-add-layer tile tiledraw2 0)
;just to look a little better
(gimp-selection-all img)
(gimp-context-set-background backcolor)
(gimp-edit-fill layer-one BACKGROUND-FILL)
(gimp-selection-none img)
(create-tiles tile tiledraw1 tiledraw2 size thickness backcolor forecolor)
(while (<= Xindex xtiles)
(while (<= Yindex ytiles)
(if (= (rand 2) 0)
(use-tiles img layer-one height width tile tiledraw1 (* Xindex size) (* Yindex size))
(use-tiles img layer-one height width tile tiledraw2 (* Xindex size) (* Yindex size))
)
(set! Yindex (+ Yindex 1))
)
(set! Yindex 0)
(set! Xindex (+ Xindex 1))
)
(gimp-image-delete tile)
(gimp-image-undo-enable img)
(gimp-display-new img)
(gimp-context-pop)
)
)
(script-fu-register "script-fu-truchet"
_"T_ruchet..."
_"Create an image filled with a Truchet pattern"
"Adrian Likins <aklikins@eos.ncsu.edu>"
"Adrian Likins"
"1997"
""
SF-ADJUSTMENT _"Block size" '(32 2 512 1 10 1 1)
SF-ADJUSTMENT _"Thickness" '(2 1 512 1 10 1 1)
SF-COLOR _"Background color" "white"
SF-COLOR _"Foreground color" "black"
SF-ADJUSTMENT _"Number of X tiles" '(5 1 512 1 10 1 1)
SF-ADJUSTMENT _"Number of Y tiles" '(5 1 512 1 10 1 1)
)
(script-fu-menu-register "script-fu-truchet"
"<Image>/File/Create/Patterns")