/usr/share/gimp/2.0/scripts/bates-gradient-difference.scm is in gimp-plugin-registry 5.20120621ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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; The GIMP -- an image manipulation program
; Copyright (C) 1995 Spencer Kimball and Peter Mattis
;
; Gradient Difference script for GIMP 2.4
; Created by Daniel Bates
;
; Tags: public domain, render, gradient
;
; Author statement:
;
; Adds a new layer and uses the gradient tool to generate a random design
;
; --------------------------------------------------------------------
; Distributed by Gimp FX Foundry project
; --------------------------------------------------------------------
; - Changelog -
;
; --------------------------------------------------------------------
;
; This script is released into the public domain.
; You may redistribute and/or modify this script or extract segments without prior consent.
;
; This script is distributed in the hope of being useful
; but without warranty, explicit or otherwise.
;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;Define Script
(define (script-fu-grad-diff theImage theDraw theRepeat theStyle)
;Declare Variables
(let*
(
(theHeight 0)
(theWidth 0)
(grad-layer 0)
(theType 0)
(theAlt 1)
(varX1 0)
(varX2 0)
(varY1 0)
(varY2 0)
)
(gimp-context-push)
; Begin Undo Group
(gimp-image-undo-group-start theImage)
; Set height, width and type based on current image values
(set! theHeight (car (gimp-image-height theImage)))
(set! theWidth (car (gimp-image-width theImage)))
(set! theType (car (gimp-drawable-type-with-alpha theDraw)))
; Set a new layer
(set! grad-layer (gimp-layer-new theImage theWidth theHeight theType "Grad Diff #1" 100 0) )
; Fill the layer with Black
(gimp-context-set-background '(0 0 0))
(gimp-drawable-fill (car grad-layer) 1)
; Add the set layer
(gimp-image-add-layer theImage (car grad-layer) -1)
; Move the layer to the top of the stack and make it active
(gimp-image-raise-layer-to-top theImage (car grad-layer))
(gimp-image-set-active-layer theImage (car grad-layer))
; Set the Full saturation spectrum CCW gradient as the active one
(gimp-context-set-gradient "Full saturation spectrum CCW")
(while (> theRepeat 0)
; Assign random values to x and y variables for gradient tool usage
; Assign x and y values based on x-axis
(if (= theStyle 0)
(begin
(set! varX1 (- (random 1) (/ theWidth 2)))
(set! varX2 (+ (random theWidth) (* theWidth 1.5)))
(set! varY1 (- (random (* theHeight 3)) theHeight))
(if (>= varY1 (/ theHeight 2))
(set! varY2 (+ (random theHeight) theHeight)))
(if (< varY1 (/ theHeight 2))
(set! varY2 (- (random theHeight) theHeight)))
))
; Assign x and y values based on y-axis
(if (= theStyle 1)
(begin
(set! varY1 (- (random 1) (/ theHeight 2)))
(set! varY2 (+ (random theHeight) (* theHeight 1.5)))
(set! varX1 (- (random (* theWidth 3)) theWidth))
(if (>= varX1 (/ theWidth 2))
(set! varX2 (+ (random theWidth) theWidth)))
(if (< varX1 (/ theWidth 2))
(set! varX2 (- (random theWidth) theWidth)))
))
; Alternate how the x and y values are assigned
(if (= theStyle 2)
(begin
(if (= theAlt 1)
(begin
(set! varX1 (- (random 1) (/ theWidth 2)))
(set! varX2 (+ (random theWidth) (* theWidth 1.5)))
(set! varY1 (- (random (* theHeight 3)) theHeight))
(if (>= varY1 (/ theHeight 2))
(set! varY2 (+ (random theHeight) theHeight)))
(if (< varY1 (/ theHeight 2))
(set! varY2 (- (random theHeight) theHeight)))
(set! theAlt 2)
))
(if (= theAlt 2)
(begin
(set! varY1 (- (random 1) (/ theHeight 2)))
(set! varY2 (+ (random theHeight) (* theHeight 1.5)))
(set! varX1 (- (random (* theWidth 3)) theWidth))
(if (>= varX1 (/ theWidth 2))
(set! varX2 (+ (random theWidth) theWidth)))
(if (< varX1 (/ theWidth 2))
(set! varX2 (- (random theWidth) theWidth)))
(set! theAlt 1)
))
))
; Randomize how the x and y values are assigned
(if (= theStyle 3)
(begin
(set! theAlt (random 2))
(if (= theAlt 0)
(begin
(set! varX1 (- (random 1) (/ theWidth 2)))
(set! varX2 (+ (random theWidth) (* theWidth 1.5)))
(set! varY1 (- (random (* theHeight 3)) theHeight))
(if (>= varY1 (/ theHeight 2))
(set! varY2 (+ (random theHeight) theHeight)))
(if (< varY1 (/ theHeight 2))
(set! varY2 (- (random theHeight) theHeight)))
))
(if (= theAlt 1)
(begin
(set! varY1 (- (random 1) (/ theHeight 2)))
(set! varY2 (+ (random theHeight) (* theHeight 1.5)))
(set! varX1 (- (random (* theWidth 3)) theWidth))
(if (>= varX1 (/ theWidth 2))
(set! varX2 (+ (random theWidth) theWidth)))
(if (< varX1 (/ theWidth 2))
(set! varX2 (- (random theWidth) theWidth)))
))
))
; Apply gradient
(gimp-edit-blend (car grad-layer) 3 6 2 100 0 2 FALSE FALSE 0 0 TRUE varX1 varY1 varX2 varY2)
; Minus one from repeat count
(set! theRepeat (- theRepeat 1))
)
; Update display
(gimp-displays-flush)
; End Undo Group
(gimp-image-undo-group-end theImage)
(gimp-context-pop)
)
)
; Register Script
(script-fu-register "script-fu-grad-diff"
_"Gradient Difference..."
_"Uses the gradient tool to generate a random design"
"Daniel Bates"
"Daniel Bates"
"Dec 2007"
"*"
SF-IMAGE "SF-IMAGE" 0
SF-DRAWABLE "SF-DRAWABLE" 0
SF-ADJUSTMENT _"Repeat" '(5 1 200 1 3 0 1)
SF-OPTION _"Style" '(_"X axis" _"Y axis" _"Alternating" _"Random")
)
(script-fu-menu-register "script-fu-grad-diff"
"<Image>/FX-Foundry/Artistic")
|