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+; "Rippling Image" animation generator (ripply-anim.scm)
+; Adam D. Moss (adam@foxbox.org)
+; 97/05/18
+; Revised by Saul Goode April 2015.
+;
+; Designed to be used in conjunction with a plugin capable
+; of saving animations (i.e. the GIF plugin).
+;
+
+(define (script-fu-ripply-anim image drawable displacement num-frames edge-type)
+  (let* ((width (car (gimp-drawable-width drawable)))
+         (height (car (gimp-drawable-height drawable)))
+         (work-image (car (gimp-image-new width
+                                          height
+                                          (quotient (car (gimp-drawable-type drawable))
+                                                    2))))
+         (map-layer (car (gimp-layer-new work-image
+                                         width
+                                         height
+                                         (car (gimp-drawable-type drawable))
+                                         "Ripple Map"
+                                         100
+                                         LAYER-MODE-NORMAL))))
+    (gimp-context-push)
+    (gimp-context-set-paint-mode LAYER-MODE-NORMAL)
+    (gimp-context-set-opacity 100.0)
+    (gimp-image-undo-disable work-image)
+
+    ; Create a tile-able displacement map in the first layer
+    (gimp-context-set-background '(127 127 127))
+    (gimp-image-insert-layer work-image map-layer 0 0)
+    (gimp-drawable-edit-fill map-layer FILL-BACKGROUND)
+    (plug-in-noisify RUN-NONINTERACTIVE work-image map-layer FALSE 1.0 1.0 1.0 0.0)
+    (plug-in-tile RUN-NONINTERACTIVE work-image map-layer (* width 3) (* height 3) FALSE)
+    (plug-in-gauss-iir RUN-NONINTERACTIVE work-image map-layer 35 TRUE TRUE)
+    (gimp-drawable-equalize map-layer TRUE)
+    (plug-in-gauss-rle RUN-NONINTERACTIVE work-image map-layer 5 TRUE TRUE)
+    (gimp-drawable-equalize map-layer TRUE)
+    (gimp-image-crop work-image width height width height)
+
+    ; Create the frame layers
+    (let loop ((remaining-frames num-frames))
+      (unless (zero? remaining-frames)
+        (let ((frame-layer (car (gimp-layer-new-from-drawable drawable work-image))))
+          (gimp-image-insert-layer work-image frame-layer 0 0)
+          (gimp-item-set-name frame-layer
+                              (string-append "Frame "
+                                             (number->string (+ 1 (- num-frames
+                                                                     remaining-frames)))
+                                             " (replace)"))
+          (plug-in-displace RUN-NONINTERACTIVE work-image frame-layer
+                            displacement displacement
+                            TRUE TRUE map-layer map-layer (+ edge-type 1))
+          (gimp-item-set-visible frame-layer TRUE))
+        (gimp-drawable-offset map-layer
+                              TRUE
+                              OFFSET-BACKGROUND
+                              (/ width num-frames)
+                              (/ height num-frames))
+        (loop (- remaining-frames 1))))
+
+    (gimp-image-remove-layer work-image map-layer)
+    (gimp-image-undo-enable work-image)
+    (gimp-display-new work-image)
+
+    (gimp-context-pop)))
+
+(script-fu-register "script-fu-ripply-anim"
+  _"_Rippling..."
+  _"Create a multi-layer image by adding a ripple effect to the current layer"
+  "Adam D. Moss (adam@foxbox.org), Saul Goode"
+  "Adam D. Moss, Saul Goode"
+  "1997, 2015"
+  "RGB* GRAY*"
+  SF-IMAGE      "Image to animage"    0
+  SF-DRAWABLE   "Drawable to animate" 0
+  SF-ADJUSTMENT _"Rippling strength"  '(3 0 256 1 10 1 0)
+  SF-ADJUSTMENT _"Number of frames"   '(15 0 256 1 10 0 1)
+  SF-OPTION     _"Edge behavior"      '(_"Wrap" _"Smear" _"Black")
+  )
+
+(script-fu-menu-register "script-fu-ripply-anim"
+                         "<Image>/Filters/Animation/Animators")