; 210_Shapes_circle-creator.scm
; last modified/tested by Paul Sherman [gimphelp.org]
; Wednesday, 07/15/2020 on GIMP 2.10.20
;==================================================
;
; Installation:
; This script should be placed in the user or system-wide script folder.
;
;	Windows 7/10
;	C:\Program Files\GIMP 2\share\gimp\2.0\scripts
;	or
;	C:\Users\YOUR-NAME\AppData\Roaming\GIMP\2.10\scripts
;	
;    
;	Linux
;	/home/yourname/.config/GIMP/2.10/scripts  
;	or
;	Linux system-wide
;	/usr/share/gimp/2.0/scripts
;
;==================================================
;
; LICENSE
;
;    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 <http://www.gnu.org/licenses/>.
;
;==============================================================
; Original information 
; 
; (c)2010 by Paul Sherman
; uploaded to gimphelp.org
;
; initial idea based upon:
; Plugin  : draw-circle.scm
; Author  : Arch. Giuseppe Conte 
;==============================================================
(define (210-circle-creator image layer Radius FeatherRadius isSolid circlethick sfcolor)
	(let* (
		(sx 0)
		(sy 0)
		(diameter 0)
		(dx 0)
		(dy 0)
        (image-width (car (gimp-drawable-width layer)))
	    (image-height (car (gimp-drawable-height layer)))
		(center-x (/ image-width 2))
	 	(center-y (/ image-height 2))
		(layer1 '())
		)
	; make sure thickness of circle outline is not larger than the radius
	; just knock it down rather than bother the user...
    (while (> circlethick Radius)
    	(set! circlethick (- circlethick 1))
    )
	; make sure radius fits inside image (width then height)
    (while (>= Radius (- center-x 2))
    	(set! Radius (- Radius 1))		
    )
    (while (>= Radius (- center-y 2))
    	(set! Radius (- Radius 1))		
    )
	; since size is now asured to fit in the image,
	; we can now center it in the image, since circle will be on it' own layer,
	; dragging it where wanted is easier than setting x and y coordinates.
	(set! sx (- center-x Radius))
	(set! sy (- center-y Radius))
	(set! diameter (* Radius 2))
	(set! dx diameter)
	(set! dy diameter)
	(set! layer1 (car (gimp-layer-copy layer 1)))
	(gimp-image-undo-group-start image)	
	(gimp-image-insert-layer image layer1 0 -1)
	(gimp-image-set-active-layer image layer1)
	(gimp-edit-clear layer1)
	(gimp-image-select-ellipse image CHANNEL-OP-REPLACE sx sy dx dy)
	(gimp-context-set-foreground sfcolor)
	(gimp-edit-fill layer1 0)
	; punch appropriate-size hole in circle, if not solid
	(if (not (= isSolid 1)) 
		(begin
			(gimp-selection-shrink image circlethick)
			(gimp-edit-cut layer1)))
	(gimp-selection-none image)
	(plug-in-autocrop-layer 1 image layer1)		
    ; tidy up
    (gimp-image-undo-group-end image)
    (gimp-displays-flush)
  ) ;;let
) ;;def
(script-fu-register
 "210-circle-creator"
 "Circle Draw"
 "Draw a circle"
 "Paul Sherman"
 "Paul Sherman"
 "15 October 2010"
 "*"
 SF-IMAGE "Image" 0
 SF-DRAWABLE "Layer" 0
 SF-ADJUSTMENT "Radius" '(140 0 9999 1 10 0 1)
 SF-ADJUSTMENT "Feather Edge" '(1 0 9999 1 10 0 1)
 SF-TOGGLE "\nSolid Circle?\n" FALSE
 SF-ADJUSTMENT "Circle Thickness (used if not solid)" '(1 0 200 1 10 0 1)
 SF-COLOR  "SF-COLOR" '(0 0 0)
)
(script-fu-menu-register "210-circle-creator" "<Image>/Script-Fu/Shapes")