Megatest

 vg:grow-rect
 vg:components-get-extents)

(define d1 (vg:drawing-new))
(define l1 (vg:lib-new))
(define c1 (vg:comp-new))
(define c2 (vg:comp-new))
(define bt1 (vg:make-rect 10 40 20 50 text: "A long piece of text" font: "Helvetica, -10"))

(let ((r1 (vg:make-rect 20 20 30 30 text: "r1" font: "Helvetica, -20"))
      (r2 (vg:make-rect 30 30 60 60 text: "r2" font: "Helvetica, -10"))
      (t1 (vg:make-text 60 60 "The middle" font: "Helvetica, -10")))
  (vg:add-objs-to-comp c1 r1 r2 t1 bt1))

;; add the c1 component to lib l1 with name firstcomp
(vg:add-comp-to-lib l1 "firstcomp" c1)
(vg:add-comp-to-lib l1 "secondcomp" c2)

;; add the l1 lib to drawing with name firstlib
(vg:add-lib d1 "firstlib" l1)

;; 	       1.1 1.1 -2 -2))

;; get extents of c1 and put a rectange around it
;;
(define xtnts (apply vg:grow-rect 10 10 (vg:components-get-extents d1 c1)))
(vg:add-objs-to-comp c1 (apply vg:make-rect xtnts))

(define bt1xt (vg:obj-get-extents d1 bt1))
(print "bt1xt: " bt1xt)
(vg:add-objs-to-comp c1 (apply vg:make-rect bt1xt))

;; get extents of all objects and put rectangle around it
;;
(define big-xtnts (vg:instances-get-extents d1))
(vg:add-objs-to-comp c2 (apply vg:make-rect big-xtnts))
(vg:instantiate d1 "firstlib" "secondcomp" "inst3" 0 0)

(vg:drawing-scalex-set! d1 1.5)

(declare (unit vg))
(use canvas-draw iup)
(import canvas-draw-iup)
;; structs
;;
(defstruct vg:lib     comps)
(defstruct vg:comp    objs name file)
(defstruct vg:obj     type pts fill-color text line-color call-back angle font attrib extents)
(defstruct vg:inst    libname compname theta xoff yoff scalex scaley mirrx mirry call-back cache)
(defstruct vg:drawing libs insts scalex scaley xoff yoff cnv cache) ;; libs: hash of name->lib, insts: hash of instname->inst

;; inits
;;
(define (vg:comp-new)
  (make-vg:comp objs: '() name: #f file: #f))

;;   (vg:inst-apply-scale 
;;    inst
;;    (vg:drawing-apply-scale drawing lstxy)))

;; make a rectangle obj
;;
(define (vg:make-rect x1 y1 x2 y2 #!key (line-color #f)(fill-color #f)(text #f)(font #f))
  (make-vg:obj type: 'r pts: (list x1 y1 x2 y2) text: text font: font line-color: line-color fill-color: fill-color extents: #f))

;; make a text obj
;;
(define (vg:make-text x1 y1 text #!key (line-color #f)(fill-color #f)
		      (angle #f)(scale-with-zoom #f)(font #f)
		      (font-size #f))
  (make-vg:obj type: 't pts: (list x1 y1) text: text 

	 (text       (vg:obj-text obj))
	 (font       (vg:obj-font obj))
	 (llx        (car pts))
	 (lly        (cadr pts))
	 (ulx        (caddr pts))
	 (uly        (cadddr pts))
	 (w          (- ulx llx))
	 (h          (- uly lly))
	 (text-xmax  #f)
	 (text-ymax  #f))
    (if draw 
	(let ((prev-background-color (canvas-background cnv))
	      (prev-foreground-color (canvas-foreground cnv)))
	  (if fill-color
	      (begin
		(canvas-foreground-set! cnv fill-color)
		(canvas-box! cnv llx ulx lly uly))) ;; docs are all over the place on this one.;; w h)
	  (if line-color
	      (canvas-foreground-set! cnv line-color)
	      (if fill-color
		  (canvas-foreground-set! cnv prev-foreground-color)))
	  (canvas-rectangle! cnv llx ulx lly uly)
	  (canvas-foreground-set! cnv prev-foreground-color)
	  (if text 
	      (let* ((prev-font    (canvas-font cnv))
		     (font-changed (and font (not (equal? font prev-font)))))
		(if font-changed (canvas-font-set! cnv font))
		(canvas-text! cnv (+ 2 llx)(+ 2 lly) text)
		(let-values (((xmax ymax)(canvas-text-size cnv text)))
		  (set! text-xmax xmax)(set! text-ymax ymax))
		(if font-changed (canvas-font-set! cnv prev-font))))))
    (print "text-xmax: " text-xmax " text-ymax: " text-ymax)
    (if (vg:obj-extents obj)
	(vg:obj-extents obj)
	(if (not text)
	    pts
	    (if (and text-xmax text-ymax)
		(let ((xt (list llx lly
				(max ulx (+ llx text-xmax))
				(max uly (+ lly text-ymax)))))
		  (vg:obj-extents-set! obj xt)
		  xt)
		(if cnv
		    (let-values (((xmax ymax)(canvas-text-size cnv text)))
		      (let ((xt (list llx lly
				      (max ulx (+ llx xmax))
				      (max uly (+ lly ymax)))))
			(vg:obj-extents-set! obj xt)
			xt))
		    pts)))))) ;; return extents 

;; given a rect obj draw it on the canvas applying first the drawing
;; scale and offset
;;
(define (vg:draw-text drawing obj #!key (draw #t))
  (let* ((cnv        (vg:drawing-cnv drawing))
	 (pts        (vg:drawing-apply-scale drawing (vg:obj-pts obj)))