diff options
Diffstat (limited to 'plug-ins/script-fu/scripts/line-nova.scm')
| -rw-r--r-- | plug-ins/script-fu/scripts/line-nova.scm | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/plug-ins/script-fu/scripts/line-nova.scm b/plug-ins/script-fu/scripts/line-nova.scm new file mode 100644 index 0000000..8c5c35b --- /dev/null +++ b/plug-ins/script-fu/scripts/line-nova.scm @@ -0,0 +1,123 @@ +;;; 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") |