; Amazing Circles is a script for The GIMP
;
; Turn an image into an Amazing Circle.
;
; The script is located in menu "<Image> / Script-Fu / Distorts / Amazing Circles..."
;
; Last changed: 7 May 2008
;
; Copyright (C) 2007 Harry Phillips <script-fu@tux.com.au>
;
; --------------------------------------------------------------------
;  
; Changelog:
;  Version 1.5 (7th August 2007)
;    - Added the option to choose the background colour
;
;  Version 1.4 (7th August 2007)
;    - Cleaned up the code
;    - Created a mini funtion "square-crop"
;    - Added the cropping multi option
;
;  Version 1.3 (5th August 2007)
;    - Added GPL3 licence 
;    - Menu location at the top of the script
;    - Removed the "script-fu-menu-register" section
;
;  Version 1.2
;    - Made the script compatible with GIMP 2.3
;
;  Version 1.1
;    - Added a check to see if the image is already square
;
; --------------------------------------------------------------------
;
; 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, you can view the GNU General Public
; License version 3 at the web site http://www.gnu.org/licenses/gpl-3.0.html
; Alternatively you can write to the Free Software Foundation, Inc., 675 Mass
; Ave, Cambridge, MA 02139, USA.
;
;

(define (square-crop image)
    
    (let* 
    (
        ;Read the image width and height
	(width (car (gimp-image-width image)))
	(height (car (gimp-image-height image)))

    )
	
	(if (= width height)
		()
		(begin

	;Check which is longer
	(if 	(> width height)
		(gimp-image-crop image height height (/ (- width height) 2) 0)
		(gimp-image-crop image width width 0 (/ (- height width) 2))
	
	))
)))


(define (script-fu-amazing-circles	theImage
					theLayer
					circlePercent
					backGround
					cropType)

    ;Start an undo group so the process can be undone with one undo
    (gimp-image-undo-group-start theImage)
    
    ;Initiate some variables
    (let* (
	;Read the current colour
	(myBackground (car (gimp-context-get-background)))

    )

    ;Set the background colour
    (gimp-context-set-background backGround)

    ;Select none
    (gimp-selection-none theImage)

    (if (= cropType 1)
    	(square-crop theImage)
    	()
    )

    ;First polar co-ord with "To Polar = off"
    (plug-in-polar-coords 1 theImage theLayer circlePercent 0 1 0 0)

    ;Flip vertically
    (gimp-image-flip theImage 1)

    ;Second polar co-ord with "To Polar = on"
    (plug-in-polar-coords 1 theImage theLayer circlePercent 0 1 0 1)

    (if (= cropType 0)
    	(square-crop theImage)
    	()
    )

    ;Reset the background colour
    (gimp-context-set-background myBackground)

    ;Finish the undo group for the process
    (gimp-image-undo-group-end theImage)

    ;Ensure the updated image is displayed now
    (gimp-displays-flush)

))


(script-fu-register "script-fu-amazing-circles"
            _"<Image>/Script-Fu/Distorts/Amazing circles..."
            "Does the amazing circles on a square image"
            "Harry Phillips"
            "Harry Phillips"
            "Mar. 23 2007"
            "*"
            SF-IMAGE		"Image"     0
            SF-DRAWABLE		"Drawable"  0
	    SF-ADJUSTMENT	_"Circle depth"      '(100 0 100 1 10 1 0)
            SF-COLOR		"Surround colour" '(255 255 255)
	    SF-OPTION		"Crop image?"		'("Crop after" "Crop before" "Don't crop")
)