Gimp/plug-ins/script-fu/scripts/test-sphere.scm

; This is a slightly modified copy of the sphere script to show and test 
; the possibilities of the new Script-Fu API extensions.
;
; ----------------------------------------------------------------------
; SF-ADJUSTMENT 
; is only useful in interactive mode, if you call a script from
; the console, it acts just like a normal SF-VALUE
; In interactive mode it creates an adjustment widget in the dialog.
;
; Usage: 
; SF-ADJUSTMENT "label" '(value, lower, upper, step_inc, page_inc, digits, type) 
;
; type is one of: SF-SLIDER(0), SF-SPINNER(1)
; ----------------------------------------------------------------------
; SF-FONT
; creates a font-selection widget in the dialog. It returns a fontname as
; a string. There are two new gimp-text procedures to ease the use of this
; return parameter:
;
;  (gimp-text-fontname image drawable x-pos y-pos text border antialias size unit font)
;  (gimp-text-get-extents-fontname text size unit font))
;
; where font is the fontname you get. The size specified in the fontname 
; is silently ignored. It is only used in the font-selector. So you are asked to
; set it to a useful value (24 pixels is a good choice) when using SF-FONT.
;
; Usage:
; SF-FONT "label" "fontname"		
; ----------------------------------------------------------------------
;
; SF-BRUSH 
; is only useful in interactive mode. It will create a widget in the control
; dialog. The widget consists of a preview area (which when pressed will 
; produce a popup preview ) and a button with the "..." label. The button will
; popup a dialog where brushes can be selected and each of the 
; characteristics of the brush can be modified.
; 
; The actual value returned when the script is invoked is a list 
; consisting of Brush name, opacity, spacing and brush mode in the same 
; units as passed in as the default value.
;
; Usage:-
; SF_BRUSH "Brush" '("Circle (03)" 1.0 44 0)
;
; Here the brush dialog will be popped up with a default brush of Circle (03)
; opacity 1.0, spacing 44 and paint mode of Normal (value 0).
; If this selection was unchanged the value passed to the function as a 
; paramater would be '("Circle (03)" 1.0 44 0). BTW the widget used
; is generally available in the libgimpui library for any plugin that
; wishes to select a brush.
; ----------------------------------------------------------------------
;
; SF-PATTERN
; Only useful in interactive mode. It will create a widget in the control
; dialog. The widget consists of a preview area (which when pressed will 
; produce a popup preview ) and a button with the "..." label. The button will
; popup a dialog where patterns can be selected.
;
; Usage:-
; SF-PATTERN "Pattern" "Maple Leaves"
;
; The vaule returned when the script is invoked is a string containing the 
; pattern name. If the above selection was not altered the string would 
; contain "Maple Leaves"



;
(define (script-fu-test-sphere radius light shadow bg-color sphere-color brush text pattern font size)
  (let* ((width (* radius 3.75))
	 (height (* radius 2.5))
	 (img (car (gimp-image-new width height RGB)))
	 (drawable (car (gimp-layer-new img width height RGB_IMAGE "Sphere Layer" 100 NORMAL)))
	 (radians (/ (* light *pi*) 180))
	 (cx (/ width 2))
	 (cy (/ height 2))
	 (light-x (+ cx (* radius (* 0.6 (cos radians)))))
	 (light-y (- cy (* radius (* 0.6 (sin radians)))))
	 (light-end-x (+ cx (* radius (cos (+ *pi* radians)))))
	 (light-end-y (- cy (* radius (sin (+ *pi* radians)))))
	 (offset (* radius 0.1))
	 (text-extents (gimp-text-get-extents-fontname text size PIXELS font))
	 (x-position (- cx (/ (car text-extents) 2)))
	 (y-position (- cy (/ (cadr text-extents) 2)))
	 (old-fg (car (gimp-palette-get-foreground)))
	 (old-bg (car (gimp-palette-get-background))))
    (gimp-image-disable-undo img)
    (gimp-image-add-layer img drawable 0)
    (gimp-palette-set-foreground sphere-color)
    (gimp-palette-set-background bg-color)
    (gimp-edit-fill img drawable)
    (gimp-palette-set-background '(20 20 20))
    (if (and
	 (or (and (>= light 45) (<= light 75)) (and (<= light 135) (>= light 105)))
	 (= shadow TRUE))
	(let ((shadow-w (* (* radius 2.5) (cos (+ *pi* radians))))
	      (shadow-h (* radius 0.5))
	      (shadow-x cx)
	      (shadow-y (+ cy (* radius 0.65))))
	  (if (< shadow-w 0)
	      (prog1 (set! shadow-x (+ cx shadow-w))
		     (set! shadow-w (- shadow-w))))
	  (gimp-ellipse-select img shadow-x shadow-y shadow-w shadow-h REPLACE TRUE TRUE 7.5)
	  (gimp-patterns-set-pattern pattern)
	  (gimp-bucket-fill img drawable PATTERN-BUCKET-FILL MULTIPLY 100 0 FALSE 0 0)))
    (gimp-ellipse-select img (- cx radius) (- cy radius) (* 2 radius) (* 2 radius) REPLACE TRUE FALSE 0)
    (gimp-blend img drawable FG-BG-RGB NORMAL RADIAL 100 offset REPEAT-NONE
		FALSE 0 0 light-x light-y light-end-x light-end-y)
    (gimp-selection-none img)

    (gimp-palette-set-foreground '(0 0 0))
    (gimp-floating-sel-anchor (car (gimp-text-fontname img drawable 
						       x-position y-position
						       text
						       0 TRUE 
						       size PIXELS 
						       font)))

    (gimp-palette-set-background old-bg)
    (gimp-palette-set-foreground old-fg)
    (gimp-image-enable-undo img)
    (gimp-display-new img)))

(script-fu-register "script-fu-test-sphere"
		    "<Toolbox>/Xtns/Script-Fu/Test/Sphere"
		    "Simple script to test and show the usage of the new Script-Fu API extensions. \n\nNote the use of spinbuttons, sliders, the font selector and do not forget the about dialog..."
		    "Spencer Kimball, Sven Neumann"
		    "Spencer Kimball"
		    "1996, 1998"
		    ""
		    SF-ADJUSTMENT "Radius (in pixels)" '(100 1 5000 1 10 0 1)
		    SF-ADJUSTMENT "Lighting (degrees)" '(45 0 360 1 10 1 0)
		    SF-TOGGLE "Shadow" TRUE
		    SF-COLOR "Background Color" '(255 255 255)
		    SF-COLOR "Sphere Color" '(255 0 0)
	            SF-BRUSH "Brush" '("Circle (03)" 1.0 44 0)
		    SF-STRING "Text" "Script-Fu rocks!"
		    SF-PATTERN "Pattern" "Maple Leaves"
		    SF-FONT "Font" "-freefont-agate-normal-r-normal-*-24-*-*-*-p-*-*-*"
                    SF-ADJUSTMENT "Font size (in pixels)" '(50 1 1000 1 10 0 1))