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;;; grid-system.scm -*-scheme-*-
;;; Time-stamp: <1998/01/20 23:22:02 narazaki@InetQ.or.jp>
;;; This file is a part of:
;;; The GIMP (Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis)
;;; Author: Shuji Narazaki (narazaki@InetQ.or.jp)
;;; Version 0.6
;;; Code:
(if (not (symbol-bound? 'script-fu-grid-system-x-divides (the-environment)))
(define script-fu-grid-system-x-divides "'(1 g 1)"))
(if (not (symbol-bound? 'script-fu-grid-system-y-divides (the-environment)))
(define script-fu-grid-system-y-divides "'(1 g 1)"))
(define (script-fu-grid-system img drw x-divides-orig y-divides-orig)
(define (update-segment! s x0 y0 x1 y1)
(aset s 0 x0)
(aset s 1 y0)
(aset s 2 x1)
(aset s 3 y1))
(define (map proc seq)
(if (null? seq)
'()
(cons (proc (car seq))
(map proc (cdr seq)))))
(define (convert-g l)
(cond ((null? l) '())
((eq? (car l) 'g) (cons 1.618 (convert-g (cdr l))))
((eq? (car l) '1/g) (cons 0.618 (convert-g (cdr l))))
('else (cons (car l) (convert-g (cdr l))))))
(define (wrap-list l)
(define (wrap-object obj)
(cond ((number? obj) (string-append (number->string obj) " "))
((eq? obj 'g) "g ")
(eq? obj '1/g) "1/g "))
(string-append "'("
(apply string-append (map wrap-object l))
")"))
(let* ((drw-width (car (gimp-drawable-width drw)))
(drw-height (car (gimp-drawable-height drw)))
(drw-offset-x (nth 0 (gimp-drawable-offsets drw)))
(drw-offset-y (nth 1 (gimp-drawable-offsets drw)))
(grid-layer #f)
(segment (cons-array 4 'double))
(stepped-x 0)
(stepped-y 0)
(temp 0)
(total-step-x 0)
(total-step-y 0))
(set! x-divides (convert-g x-divides-orig))
(set! y-divides (convert-g y-divides-orig))
(set! total-step-x (apply + x-divides))
(set! total-step-y (apply + y-divides))
(gimp-image-undo-group-start img)
(set! grid-layer (car (gimp-layer-copy drw TRUE)))
(gimp-image-add-layer img grid-layer 0)
(gimp-edit-clear grid-layer)
(gimp-drawable-set-name grid-layer "Grid Layer")
(while (not (null? (cdr x-divides)))
(set! stepped-x (+ stepped-x (car x-divides)))
(set! temp (* drw-width (/ stepped-x total-step-x)))
(set! x-divides (cdr x-divides))
(update-segment! segment
(+ drw-offset-x temp) drw-offset-y
(+ drw-offset-x temp) (+ drw-offset-y drw-height))
(gimp-pencil grid-layer 4 segment))
(while (not (null? (cdr y-divides)))
(set! stepped-y (+ stepped-y (car y-divides)))
(set! temp (* drw-height (/ stepped-y total-step-y)))
(set! y-divides (cdr y-divides))
(update-segment! segment
drw-offset-x (+ drw-offset-y temp)
(+ drw-offset-x drw-width) (+ drw-offset-y temp))
(gimp-pencil grid-layer 4 segment))
(gimp-image-undo-group-end img)
(set! script-fu-grid-system-x-divides (wrap-list x-divides-orig))
(set! script-fu-grid-system-y-divides (wrap-list y-divides-orig))
(gimp-displays-flush)))
(script-fu-register "script-fu-grid-system"
_"_Grid..."
"Draw grid as specified by X-DIVIDES (list of propotions relative to the drawable) and Y-DIVIDES. The color and width of grid is detemined by the current settings of brush."
"Shuji Narazaki <narazaki@InetQ.or.jp>"
"Shuji Narazaki"
"1997"
"RGB*, INDEXED*, GRAY*"
SF-IMAGE "Image to use" 0
SF-DRAWABLE "Drawable to draw grid" 0
SF-VALUE _"X divisions" script-fu-grid-system-x-divides
SF-VALUE _"Y divisions" script-fu-grid-system-y-divides)
(script-fu-menu-register "script-fu-grid-system"
_"<Image>/Script-Fu/Render")
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