b8b5d7834d
* plug-ins/script-fu/scripts/*: removed the image
argument from functions that no longer need it.
97 lines
3.6 KiB
Scheme
97 lines
3.6 KiB
Scheme
;;; line-nova.scm -*-scheme-*-
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;;; Time-stamp: <1998/01/17 21:15:38 narazaki@InetQ.or.jp>
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;;; Author Shuji Narazaki <narazaki@inetq.or.jp>
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;;; Version 0.6
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(if (not (symbol-bound? 'script-fu-line-nova-num-of-lines (the-environment)))
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(define script-fu-line-nova-num-of-lines 200))
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(if (not (symbol-bound? 'script-fu-line-nova-corn-deg (the-environment)))
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(define script-fu-line-nova-corn-deg 1.0))
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(if (not (symbol-bound? 'script-fu-line-nova-offset (the-environment)))
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(define script-fu-line-nova-offset 100))
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(if (not (symbol-bound? 'script-fu-line-nova-variation (the-environment)))
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(define script-fu-line-nova-variation 30))
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(define (script-fu-line-nova img drw num-of-lines corn-deg offset variation)
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(let* ((*points* (cons-array (* 3 2) 'double))
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(modulo fmod) ; in R4RS way
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(pi/2 (/ *pi* 2))
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(pi/4 (/ *pi* 4))
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(pi3/4 (* 3 pi/4))
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(pi5/4 (* 5 pi/4))
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(pi3/2 (* 3 pi/2))
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(pi7/4 (* 7 pi/4))
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(2pi (* 2 *pi*))
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(rad/deg (/ 2pi 360))
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(variation/2 (/ variation 2))
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(drw-width (car (gimp-drawable-width drw)))
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(drw-height (car (gimp-drawable-height drw)))
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(drw-offsets (gimp-drawable-offsets drw))
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(old-selection (car (gimp-selection-save img)))
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(radius (max drw-height drw-width))
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(index 0)
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(dir-deg/line (/ 360 num-of-lines)))
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(define (draw-vector beg-x beg-y direction)
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(define (set-point! index x y)
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(aset *points* (* 2 index) x)
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(aset *points* (+ (* 2 index) 1) y))
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(define (deg->rad rad)
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(* (modulo rad 360) rad/deg))
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(define (set-marginal-point beg-x beg-y direction)
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(let ((dir1 (deg->rad (+ direction corn-deg)))
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(dir2 (deg->rad (- direction corn-deg))))
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(define (aux dir index)
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(set-point! index
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(+ beg-x (* (cos dir) radius))
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(+ beg-y (* (sin dir) radius))))
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(aux dir1 1)
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(aux dir2 2)))
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(let ((dir0 (deg->rad direction))
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(of (+ offset (- (modulo (rand) variation) variation/2))))
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(set-point! 0
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(+ beg-x (* of (cos dir0)))
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(+ beg-y (* of (sin dir0))))
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(set-marginal-point beg-x beg-y direction)
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(gimp-free-select img 6 *points* ADD
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TRUE ; antialias
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FALSE ; feather
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0 ; feather radius
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)))
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(gimp-undo-push-group-start img)
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(gimp-selection-none img)
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(srand (realtime))
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(while (< index num-of-lines)
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(draw-vector (+ (nth 0 drw-offsets) (/ drw-width 2))
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(+ (nth 1 drw-offsets) (/ drw-height 2))
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(* index dir-deg/line))
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(set! index (+ index 1)))
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(gimp-bucket-fill drw FG-BUCKET-FILL NORMAL 100 0 FALSE 0 0)
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(gimp-selection-load old-selection)
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;; (gimp-image-set-active-layer img drw)
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;; delete extra channel by Sven Neumann <neumanns@uni-duesseldorf.de>
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(gimp-image-remove-channel img old-selection)
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(gimp-undo-push-group-end img)
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(set! script-fu-line-nova-num-of-lines num-of-lines)
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(set! script-fu-line-nova-corn-deg corn-deg)
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(set! script-fu-line-nova-offset offset)
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(set! script-fu-line-nova-variation variation)
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(gimp-displays-flush)))
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(script-fu-register
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"script-fu-line-nova"
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"<Image>/Script-Fu/Render/Line Nova"
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"Line Nova. Draw lines with Foreground color from the center of image to the edges. 1st undo cancels bucket-fill. 2nd undo gets orignal selection."
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"Shuji Narazaki <narazaki@InetQ.or.jp>"
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"Shuji Narazaki"
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"1997"
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"RGB*, INDEXED*, GRAY*"
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SF-IMAGE "Image to use" 0
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SF-DRAWABLE "Drawable to draw line" 0
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SF-VALUE "Number of lines" (number->string script-fu-line-nova-num-of-lines)
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SF-VALUE "Sharpness (deg.)" (number->string script-fu-line-nova-corn-deg)
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SF-VALUE "Offset radius" (number->string script-fu-line-nova-offset)
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SF-VALUE "- randomness" (number->string script-fu-line-nova-variation)
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)
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;;; line-nova.scm ends here
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