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+;;; line-nova.scm for gimp-1.1 -*-scheme-*-
+;;; Time-stamp: <1998/11/25 13:26:44 narazaki@gimp.org>
+;;; Author Shuji Narazaki <narazaki@gimp.org>
+;;; Version 0.7
+
+(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 FALSE)
+ (radius (max drw-height drw-width))
+ (index 0)
+ (dir-deg/line (/ 360 num-of-lines))
+ (fg-color (car (gimp-context-get-foreground)))
+ )
+ (gimp-context-push)
+ (gimp-context-set-defaults)
+ (gimp-context-set-foreground fg-color)
+
+ (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))
+ (off (+ offset (- (modulo (rand) variation) variation/2)))
+ )
+
+ (set-point! 0
+ (+ beg-x (* off (cos dir0)))
+ (+ beg-y (* off (sin dir0)))
+ )
+ (set-marginal-point beg-x beg-y direction)
+ (gimp-image-select-polygon img CHANNEL-OP-ADD 6 *points*)
+ )
+ )
+
+ (gimp-image-undo-group-start img)
+
+ (set! old-selection
+ (if (eq? (car (gimp-selection-is-empty img)) TRUE)
+ #f
+ (car (gimp-selection-save 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-drawable-edit-fill drw FILL-FOREGROUND)
+
+ (if old-selection
+ (begin
+ (gimp-image-select-item img CHANNEL-OP-REPLACE 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-image-undo-group-end img)
+ (gimp-displays-flush)
+ (gimp-context-pop)
+ )
+)
+
+(script-fu-register "script-fu-line-nova"
+ _"Line _Nova..."
+ _"Fill a layer with rays emanating outward from its center using the foreground color"
+ "Shuji Narazaki <narazaki@gimp.org>"
+ "Shuji Narazaki"
+ "1997,1998"
+ "*"
+ SF-IMAGE "Image" 0
+ SF-DRAWABLE "Drawable" 0
+ SF-ADJUSTMENT _"Number of lines" '(200 40 1000 1 1 0 1)
+ SF-ADJUSTMENT _"Sharpness (degrees)" '(1.0 0.0 10.0 0.1 1 1 1)
+ SF-ADJUSTMENT _"Offset radius" '(100 0 2000 1 1 0 1)
+ SF-ADJUSTMENT _"Randomness" '(30 1 2000 1 1 0 1)
+)
+
+(script-fu-menu-register "script-fu-line-nova"
+ "<Image>/Filters/Render")