8729f9a662
... from menus. The script-fu version is still available through pdb (for scripts) and even in the action search. But in menus, only the new Python version will be shown. Also update the description and name of the old version to make clear it is deprecated in favor of the new plug-in. Finally rename the new version to simply "plug-in-spyrogimp" (dropping the "-plus" part as we should consider it as a replacement rather than as another plug-in, which the "plus" would imply). Anyway the old one was called "script-fu-spyrogimp", so there is no name clash. While at it, do some trailing whitespace cleaning in the new plug-in.
353 lines
12 KiB
Scheme
353 lines
12 KiB
Scheme
; spyrogimp.scm -*-scheme-*-
|
|
; Draws Spirographs, Epitrochoids and Lissajous Curves.
|
|
; More info at http://www.wisdom.weizmann.ac.il/~elad/spyrogimp/
|
|
; Version 1.2
|
|
;
|
|
; Copyright (C) 2003 by Elad Shahar <elad@wisdom.weizmann.ac.il>
|
|
;
|
|
; 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/>.
|
|
|
|
|
|
; This routine is invoked by a dialog.
|
|
; It is the main routine in this file.
|
|
(define (script-fu-spyrogimp img drw
|
|
type shape
|
|
oteeth iteeth
|
|
margin hole-ratio start-angle
|
|
tool brush
|
|
color-method color grad)
|
|
|
|
; Internal function to draw the spyro.
|
|
(define (script-fu-spyrogimp-internal img drw
|
|
x1 y1 x2 y2 ; Bounding box.
|
|
type ; = 0 (Spirograph), 1 (Epitrochoid), 2(Lissajous) .
|
|
shape ; = 0 (Circle), 1 (Frame), >2 (Polygons) .
|
|
oteeth iteeth ; Outer and inner teeth.
|
|
margin hole-ratio
|
|
start-angle ; 0 <= start-angle < 360 .
|
|
tool ; = 0 (Pencil), 1 (Brush), 2 (Airbrush) .
|
|
brush
|
|
color-method ; = 0 (Single color), 1 (Grad. Loop Sawtooth),
|
|
; 2 (Grad. Loop triangle) .
|
|
color ; Used when color-method = Single color .
|
|
grad ; Gradient used in Gradient color methods.
|
|
)
|
|
|
|
|
|
; This function returns a list of samples according to the gradient.
|
|
(define (get-gradient steps color-method grad)
|
|
(if (= color-method 1)
|
|
; option 1
|
|
; Just return the gradient
|
|
(gimp-gradient-get-uniform-samples grad (min steps 50) FALSE)
|
|
|
|
; option 2
|
|
; The returned list is such that the gradient appears two times, once
|
|
; in the normal order and once in reverse. This way there are no color
|
|
; jumps if we go beyond the edge
|
|
(let* (
|
|
; Sample the gradient into array "gr".
|
|
(gr (gimp-gradient-get-uniform-samples grad
|
|
(/ (min steps 50) 2)
|
|
FALSE))
|
|
|
|
(grn (car gr)) ; length of sample array.
|
|
(gra (cadr gr)) ; array of color samples (R1,G1,B1,A1, R2,....)
|
|
|
|
; Allocate array gra-new of size (2 * grn) - 8,
|
|
; but since each 4 items is actually one (RGBA) tuple,
|
|
; it contains 2x - 2 entries.
|
|
(grn-new (+ grn grn -8))
|
|
(gra-new (cons-array grn-new 'double))
|
|
|
|
(gr-index 0)
|
|
(gr-index2 0)
|
|
)
|
|
|
|
; Copy original array gra to gra_new.
|
|
(while (< gr-index grn)
|
|
(aset gra-new gr-index (aref gra gr-index))
|
|
(set! gr-index (+ 1 gr-index))
|
|
)
|
|
|
|
; Copy second time, but in reverse
|
|
(set! gr-index2 (- gr-index 8))
|
|
(while (< gr-index grn-new)
|
|
(aset gra-new gr-index (aref gra gr-index2))
|
|
(set! gr-index (+ 1 gr-index))
|
|
(set! gr-index2 (+ 1 gr-index2))
|
|
|
|
(if (= (fmod gr-index 4) 0)
|
|
(set! gr-index2 (- gr-index2 8))
|
|
)
|
|
)
|
|
|
|
; Return list.
|
|
(list grn-new gra-new)
|
|
)
|
|
)
|
|
)
|
|
|
|
|
|
(let* (
|
|
(steps (+ 1 (lcm oteeth iteeth)))
|
|
(*points* (cons-array (* steps 2) 'double))
|
|
|
|
(ot 0) ; current outer tooth
|
|
(cx 0) ; Current x,y
|
|
(cy 0)
|
|
|
|
; If its a polygon or frame, how many sides does it have.
|
|
(poly (if (= shape 1) 4 ; A frame has four sides.
|
|
(if (> shape 1) (+ shape 1) 0)))
|
|
|
|
(2pi (* 2 *pi*))
|
|
|
|
(drw-width (- x2 x1))
|
|
(drw-height (- y2 y1))
|
|
(half-width (/ drw-width 2))
|
|
(half-height (/ drw-height 2))
|
|
(midx (+ x1 half-width))
|
|
(midy (+ y1 half-height))
|
|
|
|
(hole (* hole-ratio
|
|
(- (/ (min drw-width drw-height) 2) margin)
|
|
)
|
|
)
|
|
(irad (+ hole margin))
|
|
|
|
(radx (- half-width irad)) ;
|
|
(rady (- half-height irad)) ;
|
|
|
|
(gradt (get-gradient steps color-method grad))
|
|
(grada (cadr gradt)) ; Gradient array.
|
|
(gradn (car gradt)) ; Number of entries of gradients.
|
|
|
|
; Indexes
|
|
(grad-index 0) ; for array: grada
|
|
(point-index 0) ; for array: *points*
|
|
(index 0)
|
|
)
|
|
|
|
; Do one step of the loop.
|
|
(define (calc-and-step!)
|
|
(let* (
|
|
(oangle (* 2pi (/ ot oteeth)) )
|
|
(shifted-oangle (+ oangle (* 2pi (/ start-angle 360))) )
|
|
(xfactor (cos shifted-oangle))
|
|
(yfactor (sin shifted-oangle))
|
|
(lenfactor 1)
|
|
(ofactor (/ (+ oteeth iteeth) iteeth))
|
|
|
|
; The direction of the factor changes according
|
|
; to whether the type is a sypro or an epitcorhoid.
|
|
(mfactor (if (= type 0) (- ofactor) ofactor))
|
|
)
|
|
|
|
; If we are drawing a polygon then compute a contortion
|
|
; factor "lenfactor" which deforms the standard circle.
|
|
(if (> poly 2)
|
|
(let* (
|
|
(pi4 (/ *pi* poly))
|
|
(pi2 (* pi4 2))
|
|
|
|
(oanglemodpi2 (fmod (+ oangle
|
|
(if (= 1 (fmod poly 2))
|
|
0 ;(/ pi4 2)
|
|
0
|
|
)
|
|
)
|
|
pi2))
|
|
)
|
|
|
|
(set! lenfactor (/ ( if (= shape 1) 1 (cos pi4) )
|
|
(cos
|
|
(if (< oanglemodpi2 pi4)
|
|
oanglemodpi2
|
|
(- pi2 oanglemodpi2)
|
|
)
|
|
)
|
|
)
|
|
)
|
|
)
|
|
)
|
|
|
|
(if (= type 2)
|
|
(begin ; Lissajous
|
|
(set! cx (+ midx
|
|
(* half-width (cos shifted-oangle)) ))
|
|
(set! cy (+ midy
|
|
(* half-height (cos (* mfactor oangle))) ))
|
|
)
|
|
(begin ; Spyrograph or Epitrochoid
|
|
(set! cx (+ midx
|
|
(* radx xfactor lenfactor)
|
|
(* hole (cos (* mfactor oangle) ) ) ))
|
|
(set! cy (+ midy
|
|
(* rady yfactor lenfactor)
|
|
(* hole (sin (* mfactor oangle) ) ) ))
|
|
)
|
|
)
|
|
|
|
;; Advance teeth
|
|
(set! ot (+ ot 1))
|
|
)
|
|
)
|
|
|
|
|
|
;; Draw all the points in *points* with appropriate tool.
|
|
(define (flush-points len)
|
|
(if (= tool 0)
|
|
(gimp-pencil drw len *points*) ; Use pencil
|
|
(if (= tool 1)
|
|
(gimp-paintbrush-default drw len *points*); use paintbrush
|
|
(gimp-airbrush-default drw len *points*) ; use airbrush
|
|
)
|
|
)
|
|
|
|
; Reset points array, but copy last point to first
|
|
; position so it will connect the next time.
|
|
(aset *points* 0 (aref *points* (- point-index 2)))
|
|
(aset *points* 1 (aref *points* (- point-index 1)))
|
|
(set! point-index 2)
|
|
)
|
|
|
|
;;
|
|
;; Execution starts here.
|
|
;;
|
|
|
|
(gimp-context-push)
|
|
|
|
(gimp-image-undo-group-start img)
|
|
|
|
; Set new color, brush, opacity, paint mode.
|
|
(gimp-context-set-foreground color)
|
|
(gimp-context-set-brush (car brush))
|
|
(gimp-context-set-opacity (car (cdr brush)))
|
|
(gimp-context-set-paint-mode (car (cdr (cdr (cdr brush)))))
|
|
|
|
(gimp-progress-set-text _"Rendering Spyro")
|
|
|
|
(while (< index steps)
|
|
|
|
(calc-and-step!)
|
|
|
|
(aset *points* point-index cx)
|
|
(aset *points* (+ point-index 1) cy)
|
|
(set! point-index (+ point-index 2))
|
|
|
|
; Change color and draw points if using gradient.
|
|
(if (< 0 color-method) ; use gradient.
|
|
(if (< (/ (+ grad-index 4) gradn) (/ index steps))
|
|
(begin
|
|
(gimp-context-set-foreground
|
|
(list
|
|
(* 255 (aref grada grad-index))
|
|
(* 255 (aref grada (+ 1 grad-index)) )
|
|
(* 255 (aref grada (+ 2 grad-index)) )
|
|
)
|
|
)
|
|
(gimp-context-set-opacity (* 100 (aref grada (+ 3 grad-index) ) ) )
|
|
(set! grad-index (+ 4 grad-index))
|
|
|
|
; Draw points
|
|
(flush-points point-index)
|
|
)
|
|
)
|
|
)
|
|
|
|
(set! index (+ index 1))
|
|
|
|
(if (= 0 (modulo index 16))
|
|
(gimp-progress-update (/ index steps))
|
|
)
|
|
)
|
|
|
|
; Draw remaining points.
|
|
(flush-points point-index)
|
|
|
|
(gimp-progress-update 1.0)
|
|
|
|
(gimp-image-undo-group-end img)
|
|
(gimp-displays-flush)
|
|
|
|
(gimp-context-pop)
|
|
)
|
|
)
|
|
|
|
(let* (
|
|
; Get current selection to determine where to draw.
|
|
(bounds (cdr (gimp-selection-bounds img)))
|
|
(x1 (car bounds))
|
|
(y1 (cadr bounds))
|
|
(x2 (caddr bounds))
|
|
(y2 (car (cdddr bounds)))
|
|
)
|
|
|
|
(set! oteeth (trunc (+ oteeth 0.5)))
|
|
(set! iteeth (trunc (+ iteeth 0.5)))
|
|
|
|
(script-fu-spyrogimp-internal img drw
|
|
x1 y1 x2 y2
|
|
type shape
|
|
oteeth iteeth
|
|
margin hole-ratio start-angle
|
|
tool brush
|
|
color-method color grad)
|
|
)
|
|
)
|
|
|
|
|
|
|
|
(script-fu-register "script-fu-spyrogimp"
|
|
_"_Spyrogimp (older script-fu version)..."
|
|
_"This procedure is deprecated! Use 'plug-in-spyrogimp' instead."
|
|
"Elad Shahar <elad@wisdom.weizmann.ac.il>"
|
|
"Elad Shahar"
|
|
"June 2003"
|
|
"RGB*, INDEXED*, GRAY*"
|
|
SF-IMAGE "Image" 0
|
|
SF-DRAWABLE "Drawable" 0
|
|
|
|
SF-OPTION _"Type" '(_"Spyrograph"
|
|
_"Epitrochoid"
|
|
_"Lissajous")
|
|
SF-OPTION _"Shape" '(_"Circle"
|
|
_"Frame"
|
|
_"Triangle"
|
|
_"Square"
|
|
_"Pentagon"
|
|
_"Hexagon"
|
|
_"Polygon: 7 sides"
|
|
_"Polygon: 8 sides"
|
|
_"Polygon: 9 sides"
|
|
_"Polygon: 10 sides")
|
|
SF-ADJUSTMENT _"Outer teeth" '(86 1 120 1 10 0 0)
|
|
SF-ADJUSTMENT _"Inner teeth" '(70 1 120 1 10 0 0)
|
|
SF-ADJUSTMENT _"Margin (pixels)" '(0 -10000 10000 1 10 0 1)
|
|
SF-ADJUSTMENT _"Hole ratio" '(0.4 0.0 1.0 0.01 0.1 2 0)
|
|
SF-ADJUSTMENT _"Start angle" '(0 0 359 1 10 0 0)
|
|
|
|
SF-OPTION _"Tool" '(_"Pencil"
|
|
_"Brush"
|
|
_"Airbrush")
|
|
SF-BRUSH _"Brush" '("Circle (01)" 100 -1 0)
|
|
|
|
SF-OPTION _"Color method" '(_"Solid Color"
|
|
_"Gradient: Loop Sawtooth"
|
|
_"Gradient: Loop Triangle")
|
|
SF-COLOR _"Color" "black"
|
|
SF-GRADIENT _"Gradient" "Deep Sea"
|
|
)
|