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GIMP Script-Fu Script | 2005-06-30 | 6.1 KB | 197 lines |
- ; The GIMP -- an image manipulation program
- ; Copyright (C) 1995 Spencer Kimball and Peter Mattis
- ;
- ; This program is free software; you can redistribute it and/or modify
- ; it under the terms of the GNU General Public License as published by
- ; the Free Software Foundation; either version 2 of the License, or
- ; (at your option) any later version.
- ;
- ; This program is distributed in the hope that it will be useful,
- ; but WITHOUT ANY WARRANTY; without even the implied warranty of
- ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- ; GNU General Public License for more details.
- ;
- ; You should have received a copy of the GNU General Public License
- ; along with this program; if not, write to the Free Software
- ; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- ;
- ;
- ; perspective-shadow.scm version 1.2 2000/11/08
- ;
- ; Copyright (C) 1997-2000 Sven Neumann <sven@gimp.org>
- ;
- ;
- ; Adds a perspective shadow of the current selection or alpha-channel
- ; as a layer below the active layer
- ;
-
- (define (script-fu-perspective-shadow image
- drawable
- alpha
- rel-distance
- rel-length
- shadow-blur
- shadow-color
- shadow-opacity
- interpolation
- allow-resize)
- (let* ((shadow-blur (max shadow-blur 0))
- (shadow-opacity (min shadow-opacity 100))
- (shadow-opacity (max shadow-opacity 0))
- (rel-length (abs rel-length))
- (alpha (* (/ alpha 180) *pi*))
- (type (car (gimp-drawable-type-with-alpha drawable)))
- (image-width (car (gimp-image-width image)))
- (image-height (car (gimp-image-height image)))
- (from-selection 0)
- (active-selection 0)
- (shadow-layer 0))
-
- (if (= rel-distance 0) (set! rel-distance 999999))
-
- (gimp-context-push)
-
- (gimp-image-undo-group-start image)
-
- (gimp-layer-add-alpha drawable)
- (if (= (car (gimp-selection-is-empty image)) TRUE)
- (begin
- (gimp-selection-layer-alpha drawable)
- (set! from-selection FALSE))
- (begin
- (set! from-selection TRUE)
- (set! active-selection (car (gimp-selection-save image)))))
-
- (let* ((selection-bounds (gimp-selection-bounds image))
- (select-offset-x (cadr selection-bounds))
- (select-offset-y (caddr selection-bounds))
- (select-width (- (cadr (cddr selection-bounds)) select-offset-x))
- (select-height (- (caddr (cddr selection-bounds)) select-offset-y))
-
- (abs-length (* rel-length select-height))
- (abs-distance (* rel-distance select-height))
- (half-bottom-width (/ select-width 2))
- (half-top-width (* half-bottom-width
- (/ (- rel-distance rel-length) rel-distance)))
-
- (x0 (+ select-offset-x (+ (- half-bottom-width half-top-width)
- (* (cos alpha) abs-length))))
- (y0 (+ select-offset-y (- select-height
- (* (sin alpha) abs-length))))
- (x1 (+ x0 (* 2 half-top-width)))
- (y1 y0)
- (x2 select-offset-x)
- (y2 (+ select-offset-y select-height))
- (x3 (+ x2 select-width))
- (y3 y2)
-
- (shadow-width (+ (- (max x1 x3) (min x0 x2)) (* 2 shadow-blur)))
- (shadow-height (+ (- (max y1 y3) (min y0 y2)) (* 2 shadow-blur)))
- (shadow-offset-x (- (min x0 x2) shadow-blur))
- (shadow-offset-y (- (min y0 y2) shadow-blur)))
-
-
- (set! shadow-layer (car (gimp-layer-new image
- select-width
- select-height
- type
- "Perspective Shadow"
- shadow-opacity
- NORMAL-MODE)))
-
-
- (gimp-image-add-layer image shadow-layer -1)
- (gimp-layer-set-offsets shadow-layer select-offset-x select-offset-y)
- (gimp-drawable-fill shadow-layer TRANSPARENT-FILL)
- (gimp-context-set-background shadow-color)
- (gimp-edit-fill shadow-layer BACKGROUND-FILL)
- (gimp-selection-none image)
-
- (if (= allow-resize TRUE)
- (let* ((new-image-width image-width)
- (new-image-height image-height)
- (image-offset-x 0)
- (image-offset-y 0))
-
- (if (< shadow-offset-x 0)
- (begin
- (set! image-offset-x (- 0 shadow-offset-x))
- (set! new-image-width (- new-image-width image-offset-x))))
-
- (if (< shadow-offset-y 0)
- (begin
- (set! image-offset-y (- 0 shadow-offset-y))
- (set! new-image-height (- new-image-height image-offset-y))))
-
- (if (> (+ shadow-width shadow-offset-x) new-image-width)
- (set! new-image-width (+ shadow-width shadow-offset-x)))
-
- (if (> (+ shadow-height shadow-offset-y) new-image-height)
- (set! new-image-height (+ shadow-height shadow-offset-y)))
- (gimp-image-resize image
- new-image-width
- new-image-height
- image-offset-x
- image-offset-y)))
-
- (gimp-drawable-transform-perspective shadow-layer
- x0 y0
- x1 y1
- x2 y2
- x3 y3
- TRANSFORM-FORWARD interpolation
- TRUE 3 FALSE)
-
- (if (>= shadow-blur 1.0)
- (begin
- (gimp-layer-set-preserve-trans shadow-layer FALSE)
- (gimp-layer-resize shadow-layer
- shadow-width
- shadow-height
- shadow-blur
- shadow-blur)
- (plug-in-gauss-rle 1
- image
- shadow-layer
- shadow-blur
- TRUE
- TRUE))))
-
- (if (= from-selection TRUE)
- (begin
- (gimp-selection-load active-selection)
- (gimp-edit-clear shadow-layer)
- (gimp-image-remove-channel image active-selection)))
-
- (if (and
- (= (car (gimp-layer-is-floating-sel drawable)) 0)
- (= from-selection FALSE))
- (gimp-image-raise-layer image drawable))
-
- (gimp-image-set-active-layer image drawable)
- (gimp-image-undo-group-end image)
- (gimp-displays-flush)
-
- (gimp-context-pop)))
-
- (script-fu-register "script-fu-perspective-shadow"
- _"_Perspective..."
- "Add a perspective shadow"
- "Sven Neumann <sven@gimp.org>"
- "Sven Neumann"
- "2000/11/08"
- "RGB* GRAY*"
- SF-IMAGE "Image" 0
- SF-DRAWABLE "Drawable" 0
- SF-ADJUSTMENT _"Angle" '(45 0 180 1 10 1 0)
- SF-ADJUSTMENT _"Relative distance of horizon" '(5 0 24 .1 1 1 1)
- SF-ADJUSTMENT _"Relative length of shadow" '(1 0 24 .1 1 1 1)
- SF-ADJUSTMENT _"Blur radius" '(3 0 1024 1 10 0 0)
- SF-COLOR _"Color" '(0 0 0)
- SF-ADJUSTMENT _"Opacity" '(80 0 100 1 10 0 0)
- SF-OPTION _"Interpolation" '(_"None" _"Linear" _"Cubic")
- SF-TOGGLE _"Allow resizing" FALSE)
-
- (script-fu-menu-register "script-fu-perspective-shadow"
- _"<Image>/Script-Fu/Shadow")
-