217 lines
8.5 KiB
Scheme
217 lines
8.5 KiB
Scheme
; PIKA - Photo and Image Kooker Application
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; Copyright (C) 1995 Spencer Kimball and Peter Mattis
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;
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; This program is free software: you can redistribute it and/or modify
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; it under the terms of the GNU General Public License as published by
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; the Free Software Foundation; either version 3 of the License, or
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; (at your option) any later version.
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;
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; This program is distributed in the hope that it will be useful,
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; but WITHOUT ANY WARRANTY; without even the implied warranty of
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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; GNU General Public License for more details.
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;
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; You should have received a copy of the GNU General Public License
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; along with this program. If not, see <https://www.gnu.org/licenses/>.
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;
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;
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; perspective-shadow.scm version 1.2 2000/11/08
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;
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; Copyright (C) 1997-2000 Sven Neumann <sven@gimp.org>
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;
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;
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; Adds a perspective shadow of the current selection or alpha-channel
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; as a layer below the active layer
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;
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(define (script-fu-perspective-shadow image
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drawable
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alpha
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rel-distance
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rel-length
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shadow-blur
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shadow-color
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shadow-opacity
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interpolation
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allow-resize)
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(let* (
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(shadow-blur (max shadow-blur 0))
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(shadow-opacity (min shadow-opacity 100))
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(shadow-opacity (max shadow-opacity 0))
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(rel-length (abs rel-length))
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(alpha (* (/ alpha 180) *pi*))
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(type (car (pika-drawable-type-with-alpha drawable)))
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(image-width (car (pika-image-get-width image)))
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(image-height (car (pika-image-get-height image)))
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(from-selection 0)
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(active-selection 0)
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(shadow-layer 0)
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)
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(pika-context-push)
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(pika-context-set-defaults)
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(if (> rel-distance 24) (set! rel-distance 999999))
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(if (= rel-distance rel-length) (set! rel-distance (+ rel-distance 0.01)))
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(pika-image-undo-group-start image)
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(pika-layer-add-alpha drawable)
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(if (= (car (pika-selection-is-empty image)) TRUE)
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(begin
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(pika-image-select-item image CHANNEL-OP-REPLACE drawable)
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(set! from-selection FALSE))
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(begin
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(set! from-selection TRUE)
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(set! active-selection (car (pika-selection-save image)))))
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(let* ((selection-bounds (pika-selection-bounds image))
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(select-offset-x (cadr selection-bounds))
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(select-offset-y (caddr selection-bounds))
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(select-width (- (cadr (cddr selection-bounds)) select-offset-x))
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(select-height (- (caddr (cddr selection-bounds)) select-offset-y))
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(abs-length (* rel-length select-height))
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(abs-distance (* rel-distance select-height))
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(half-bottom-width (/ select-width 2))
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(half-top-width (* half-bottom-width
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(/ (- rel-distance rel-length) rel-distance)))
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(x0 (+ select-offset-x (+ (- half-bottom-width half-top-width)
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(* (cos alpha) abs-length))))
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(y0 (+ select-offset-y (- select-height
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(* (sin alpha) abs-length))))
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(x1 (+ x0 (* 2 half-top-width)))
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(y1 y0)
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(x2 select-offset-x)
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(y2 (+ select-offset-y select-height))
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(x3 (+ x2 select-width))
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(y3 y2)
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(shadow-width (+ (- (max x1 x3) (min x0 x2)) (* 2 shadow-blur)))
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(shadow-height (+ (- (max y1 y3) (min y0 y2)) (* 2 shadow-blur)))
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(shadow-offset-x (- (min x0 x2) shadow-blur))
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(shadow-offset-y (- (min y0 y2) shadow-blur)))
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(set! shadow-layer (car (pika-layer-new image
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select-width
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select-height
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type
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"Perspective Shadow"
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shadow-opacity
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LAYER-MODE-NORMAL)))
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(pika-image-insert-layer image shadow-layer 0 -1)
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(pika-layer-set-offsets shadow-layer select-offset-x select-offset-y)
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(pika-drawable-fill shadow-layer FILL-TRANSPARENT)
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(pika-context-set-background shadow-color)
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(pika-drawable-edit-fill shadow-layer FILL-BACKGROUND)
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(pika-selection-none image)
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(if (= allow-resize TRUE)
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(let* ((new-image-width image-width)
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(new-image-height image-height)
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(image-offset-x 0)
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(image-offset-y 0))
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(if (< shadow-offset-x 0)
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(begin
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(set! image-offset-x (abs shadow-offset-x))
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(set! new-image-width (+ new-image-width image-offset-x))
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; adjust to new coordinate system
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(set! x0 (+ x0 image-offset-x))
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(set! x1 (+ x1 image-offset-x))
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(set! x2 (+ x2 image-offset-x))
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(set! x3 (+ x3 image-offset-x))
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))
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(if (< shadow-offset-y 0)
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(begin
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(set! image-offset-y (abs shadow-offset-y))
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(set! new-image-height (+ new-image-height image-offset-y))
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; adjust to new coordinate system
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(set! y0 (+ y0 image-offset-y))
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(set! y1 (+ y1 image-offset-y))
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(set! y2 (+ y2 image-offset-y))
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(set! y3 (+ y3 image-offset-y))
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))
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(if (> (+ shadow-width shadow-offset-x) new-image-width)
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(set! new-image-width (+ shadow-width shadow-offset-x)))
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(if (> (+ shadow-height shadow-offset-y) new-image-height)
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(set! new-image-height (+ shadow-height shadow-offset-y)))
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(pika-image-resize image
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new-image-width
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new-image-height
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image-offset-x
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image-offset-y)))
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(pika-context-set-transform-direction TRANSFORM-FORWARD)
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(pika-context-set-interpolation interpolation)
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(pika-context-set-transform-resize TRANSFORM-RESIZE-ADJUST)
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(pika-item-transform-perspective shadow-layer
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x0 y0
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x1 y1
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x2 y2
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x3 y3)
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(if (>= shadow-blur 1.0)
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(begin
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(pika-layer-set-lock-alpha shadow-layer FALSE)
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(pika-layer-resize shadow-layer
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shadow-width
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shadow-height
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shadow-blur
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shadow-blur)
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(plug-in-gauss-rle RUN-NONINTERACTIVE
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image
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shadow-layer
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shadow-blur
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TRUE
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TRUE))))
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(if (= from-selection TRUE)
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(begin
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(pika-image-select-item image CHANNEL-OP-REPLACE active-selection)
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(pika-drawable-edit-clear shadow-layer)
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(pika-image-remove-channel image active-selection)))
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(if (and
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(= (car (pika-layer-is-floating-sel drawable)) 0)
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(= from-selection FALSE))
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(pika-image-raise-item image drawable))
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(pika-image-set-selected-layers image 1 (vector drawable))
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(pika-image-undo-group-end image)
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(pika-displays-flush)
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(pika-context-pop)
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)
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)
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(script-fu-register "script-fu-perspective-shadow"
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_"_Perspective..."
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_"Add a perspective shadow to the selected region (or alpha)"
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"Sven Neumann <sven@gimp.org>"
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"Sven Neumann"
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"2000/11/08"
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"RGB* GRAY*"
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SF-IMAGE "Image" 0
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SF-DRAWABLE "Drawable" 0
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SF-ADJUSTMENT _"Angle" '(45 0 180 1 10 1 0)
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SF-ADJUSTMENT _"Relative distance of horizon" '(5 0.1 24.1 0.1 1 1 1)
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SF-ADJUSTMENT _"Relative length of shadow" '(1 0.1 24 0.1 1 1 1)
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SF-ADJUSTMENT _"Blur radius" '(3 0 1024 1 10 0 0)
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SF-COLOR _"Color" '(0 0 0)
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SF-ADJUSTMENT _"Opacity" '(80 0 100 1 10 0 0)
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SF-ENUM _"Interpolation" '("InterpolationType" "linear")
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SF-TOGGLE _"Allow resizing" FALSE
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)
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(script-fu-menu-register "script-fu-perspective-shadow"
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"<Image>/Filters/Light and Shadow/[Shadow]")
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