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+; GIMP - The GNU 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 3 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, see <https://www.gnu.org/licenses/>.
+;
+;
+; 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)
+ )
+
+ (gimp-context-push)
+ (gimp-context-set-defaults)
+
+ (if (> rel-distance 24) (set! rel-distance 999999))
+ (if (= rel-distance rel-length) (set! rel-distance (+ rel-distance 0.01)))
+
+ (gimp-image-undo-group-start image)
+
+ (gimp-layer-add-alpha drawable)
+ (if (= (car (gimp-selection-is-empty image)) TRUE)
+ (begin
+ (gimp-image-select-item image CHANNEL-OP-REPLACE 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
+ LAYER-MODE-NORMAL)))
+
+
+ (gimp-image-insert-layer image shadow-layer 0 -1)
+ (gimp-layer-set-offsets shadow-layer select-offset-x select-offset-y)
+ (gimp-drawable-fill shadow-layer FILL-TRANSPARENT)
+ (gimp-context-set-background shadow-color)
+ (gimp-drawable-edit-fill shadow-layer FILL-BACKGROUND)
+ (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 (abs shadow-offset-x))
+ (set! new-image-width (+ new-image-width image-offset-x))
+ ; adjust to new coordinate system
+ (set! x0 (+ x0 image-offset-x))
+ (set! x1 (+ x1 image-offset-x))
+ (set! x2 (+ x2 image-offset-x))
+ (set! x3 (+ x3 image-offset-x))
+ ))
+
+ (if (< shadow-offset-y 0)
+ (begin
+ (set! image-offset-y (abs shadow-offset-y))
+ (set! new-image-height (+ new-image-height image-offset-y))
+ ; adjust to new coordinate system
+ (set! y0 (+ y0 image-offset-y))
+ (set! y1 (+ y1 image-offset-y))
+ (set! y2 (+ y2 image-offset-y))
+ (set! y3 (+ y3 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-context-set-transform-direction TRANSFORM-FORWARD)
+ (gimp-context-set-interpolation interpolation)
+ (gimp-context-set-transform-recursion 3)
+ (gimp-context-set-transform-resize TRANSFORM-RESIZE-ADJUST)
+
+ (gimp-item-transform-perspective shadow-layer
+ x0 y0
+ x1 y1
+ x2 y2
+ x3 y3)
+
+ (if (>= shadow-blur 1.0)
+ (begin
+ (gimp-layer-set-lock-alpha shadow-layer FALSE)
+ (gimp-layer-resize shadow-layer
+ shadow-width
+ shadow-height
+ shadow-blur
+ shadow-blur)
+ (plug-in-gauss-rle RUN-NONINTERACTIVE
+ image
+ shadow-layer
+ shadow-blur
+ TRUE
+ TRUE))))
+
+ (if (= from-selection TRUE)
+ (begin
+ (gimp-image-select-item image CHANNEL-OP-REPLACE active-selection)
+ (gimp-drawable-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-item 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 to the selected region (or alpha)"
+ "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 0.1 24.1 0.1 1 1 1)
+ SF-ADJUSTMENT _"Relative length of shadow" '(1 0.1 24 0.1 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-ENUM _"Interpolation" '("InterpolationType" "linear")
+ SF-TOGGLE _"Allow resizing" FALSE
+)
+
+(script-fu-menu-register "script-fu-perspective-shadow"
+ "<Image>/Filters/Light and Shadow/Shadow")
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-03 09:01:38 +0000