; The GIMP -- an image manipulation program
; Copyright (C) 1995 Spencer Kimball and Peter Mattis
; 
; Button00 --- create a simple beveled Web button
; Copyright (C) 1997 Federico Mena Quintero
; federico@nuclecu.unam.mx
; 
; 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 2 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, write to the Free Software
; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
; ************************************************************************
; Changed on Feb 4, 1999 by Piet van Oostrum <piet@cs.uu.nl>
; For use with GIMP 1.1.
; All calls to gimp-text-* have been converted to use the *-fontname form.
; The corresponding parameters have been replaced by an SF-FONT parameter.
; ************************************************************************


(define (text-width extents)
  (car extents))

(define (text-height extents)
  (cadr extents))

(define (text-ascent extents)
  (caddr extents))

(define (text-descent extents)
  (cadr (cddr extents)))

(define (blend-bumpmap img
		       drawable
		       x1
		       y1
		       x2
		       y2)
  (gimp-blend drawable FG-BG-RGB DARKEN-ONLY
	      GRADIENT-LINEAR 100 0 REPEAT-NONE FALSE
	      FALSE 0 0 TRUE
	      x1 y1 x2 y2))

(define (script-fu-button00 text
			    size
			    font
			    ul-color
			    lr-color
			    text-color
			    padding
			    bevel-width
			    pressed)
  (let* ((old-fg-color (car (gimp-palette-get-foreground)))
	 (old-bg-color (car (gimp-palette-get-background)))

	 (text-extents (gimp-text-get-extents-fontname text
					      size
					      PIXELS
					      font))
	 (ascent (text-ascent text-extents))
	 (descent (text-descent text-extents))

	 (img-width (+ (* 2 (+ padding bevel-width))
		       (text-width text-extents)))
	 (img-height (+ (* 2 (+ padding bevel-width))
			(+ ascent descent)))

	 (img (car (gimp-image-new img-width img-height RGB)))

	 (bumpmap (car (gimp-layer-new img img-width img-height RGBA_IMAGE "Bumpmap" 100 NORMAL)))
	 (gradient (car (gimp-layer-new img img-width img-height RGBA_IMAGE "Gradient" 100 NORMAL))))

    (gimp-image-undo-disable img)

    ; Create bumpmap layer
    
    (gimp-image-add-layer img bumpmap -1)
    (gimp-palette-set-foreground '(0 0 0))
    (gimp-palette-set-background '(255 255 255))
    (gimp-edit-fill bumpmap BG-IMAGE-FILL)

    (gimp-rect-select img 0 0 bevel-width img-height REPLACE FALSE 0)
    (blend-bumpmap img bumpmap 0 0 (- bevel-width 1) 0)

    (gimp-rect-select img 0 0 img-width bevel-width REPLACE FALSE 0)
    (blend-bumpmap img bumpmap 0 0 0 (- bevel-width 1))

    (gimp-rect-select img (- img-width bevel-width) 0 bevel-width img-height REPLACE FALSE 0)
    (blend-bumpmap img bumpmap (- img-width 1) 0 (- img-width bevel-width) 0)

    (gimp-rect-select img 0 (- img-height bevel-width) img-width bevel-width REPLACE FALSE 0)
    (blend-bumpmap img bumpmap 0 (- img-height 1) 0 (- img-height bevel-width))

    (gimp-selection-none img)

    ; Create gradient layer

    (gimp-image-add-layer img gradient -1)
    (gimp-palette-set-foreground ul-color)
    (gimp-palette-set-background lr-color)

    (gimp-blend gradient FG-BG-RGB NORMAL
		GRADIENT-LINEAR 100 0 REPEAT-NONE FALSE
		FALSE 0 0 TRUE
		0 0 (- img-width 1) (- img-height 1))

    (plug-in-bump-map 1 img gradient bumpmap
		      135 45 bevel-width 0 0 0 0 TRUE pressed 0)

    ; Create text layer

    (gimp-palette-set-foreground text-color)
    (let ((textl (car (gimp-text-fontname
		       img -1 0 0 text 0 TRUE size PIXELS font))))
      (gimp-layer-set-offsets textl
			      (+ bevel-width padding)
			      (+ bevel-width padding descent)))

    ; Done

    (gimp-selection-none img)
    (gimp-palette-set-foreground old-fg-color)
    (gimp-palette-set-background old-bg-color)
    (gimp-image-undo-enable img)
    (gimp-display-new img)))

(script-fu-register "script-fu-button00"
		    _"<Toolbox>/Xtns/Script-Fu/Buttons/Simple _Beveled Button..."
		    "Simple beveled button"
		    "Federico Mena Quintero"
		    "Federico Mena Quintero"
		    "June 1997"
		    ""
		    SF-STRING     _"Text"               "Hello world!"
		    SF-ADJUSTMENT _"Font Size (pixels)" '(16 2 100 1 1 0 1)
		    SF-FONT       _"Font"               "Sans"
		    SF-COLOR      _"Upper-Left color"   '(0 255 127)
		    SF-COLOR      _"Lower-Right color"  '(0 127 255)
		    SF-COLOR      _"Text Color"         '(0 0 0)
		    SF-ADJUSTMENT _"Padding"            '(2 1 100 1 10 0 1)
		    SF-ADJUSTMENT _"Bevel Width"        '(4 1 100 1 10 0 1)
		    SF-TOGGLE     _"Pressed"            FALSE)
