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GIMP Script-Fu Script | 1999-07-21 | 3.6 KB | 97 lines |
- ;;; line-nova.scm -*-scheme-*-
- ;;; Time-stamp: <1998/01/17 21:15:38 narazaki@InetQ.or.jp>
- ;;; Author Shuji Narazaki <narazaki@inetq.or.jp>
- ;;; Version 0.6
-
- (if (not (symbol-bound? 'script-fu-line-nova-num-of-lines (the-environment)))
- (define script-fu-line-nova-num-of-lines 200))
- (if (not (symbol-bound? 'script-fu-line-nova-corn-deg (the-environment)))
- (define script-fu-line-nova-corn-deg 1.0))
- (if (not (symbol-bound? 'script-fu-line-nova-offset (the-environment)))
- (define script-fu-line-nova-offset 100))
- (if (not (symbol-bound? 'script-fu-line-nova-variation (the-environment)))
- (define script-fu-line-nova-variation 30))
-
- (define (script-fu-line-nova img drw num-of-lines corn-deg offset variation)
- (let* ((*points* (cons-array (* 3 2) 'double))
- (modulo fmod) ; in R4RS way
- (pi/2 (/ *pi* 2))
- (pi/4 (/ *pi* 4))
- (pi3/4 (* 3 pi/4))
- (pi5/4 (* 5 pi/4))
- (pi3/2 (* 3 pi/2))
- (pi7/4 (* 7 pi/4))
- (2pi (* 2 *pi*))
- (rad/deg (/ 2pi 360))
- (variation/2 (/ variation 2))
- (drw-width (car (gimp-drawable-width drw)))
- (drw-height (car (gimp-drawable-height drw)))
- (drw-offsets (gimp-drawable-offsets drw))
- (old-selection (car (gimp-selection-save img)))
- (radius (max drw-height drw-width))
- (index 0)
- (dir-deg/line (/ 360 num-of-lines)))
- (define (draw-vector beg-x beg-y direction)
- (define (set-point! index x y)
- (aset *points* (* 2 index) x)
- (aset *points* (+ (* 2 index) 1) y))
- (define (deg->rad rad)
- (* (modulo rad 360) rad/deg))
- (define (set-marginal-point beg-x beg-y direction)
- (let ((dir1 (deg->rad (+ direction corn-deg)))
- (dir2 (deg->rad (- direction corn-deg))))
- (define (aux dir index)
- (set-point! index
- (+ beg-x (* (cos dir) radius))
- (+ beg-y (* (sin dir) radius))))
- (aux dir1 1)
- (aux dir2 2)))
- (let ((dir0 (deg->rad direction))
- (of (+ offset (- (modulo (rand) variation) variation/2))))
- (set-point! 0
- (+ beg-x (* of (cos dir0)))
- (+ beg-y (* of (sin dir0))))
- (set-marginal-point beg-x beg-y direction)
- (gimp-free-select img 6 *points* ADD
- TRUE ; antialias
- FALSE ; feather
- 0 ; feather radius
- )))
-
- (gimp-undo-push-group-start img)
- (gimp-selection-none img)
- (srand (realtime))
- (while (< index num-of-lines)
- (draw-vector (+ (nth 0 drw-offsets) (/ drw-width 2))
- (+ (nth 1 drw-offsets) (/ drw-height 2))
- (* index dir-deg/line))
- (set! index (+ index 1)))
- (gimp-bucket-fill img drw FG-BUCKET-FILL NORMAL 100 0 FALSE 0 0)
- (gimp-selection-load img old-selection)
- ;; (gimp-image-set-active-layer img drw)
- ;; delete extra channel by Sven Neumann <neumanns@uni-duesseldorf.de>
- (gimp-image-remove-channel img old-selection)
- (gimp-undo-push-group-end img)
- (set! script-fu-line-nova-num-of-lines num-of-lines)
- (set! script-fu-line-nova-corn-deg corn-deg)
- (set! script-fu-line-nova-offset offset)
- (set! script-fu-line-nova-variation variation)
- (gimp-displays-flush)))
-
- (script-fu-register
- "script-fu-line-nova"
- "<Image>/Script-Fu/Render/Line Nova"
- "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."
- "Shuji Narazaki <narazaki@InetQ.or.jp>"
- "Shuji Narazaki"
- "1997"
- "RGB*, INDEXED*, GRAY*"
- SF-IMAGE "Image to use" 0
- SF-DRAWABLE "Drawable to draw line" 0
- SF-VALUE "Number of lines" (number->string script-fu-line-nova-num-of-lines)
- SF-VALUE "Sharpness (deg.)" (number->string script-fu-line-nova-corn-deg)
- SF-VALUE "Offset radius" (number->string script-fu-line-nova-offset)
- SF-VALUE "- randomness" (number->string script-fu-line-nova-variation)
- )
- ;;; line-nova.scm ends here
-