Megatest

;;======================================================================

;; get extents, use knowledge of type ...
;;
(define (vg:obj-get-extents drawing obj)
  (let ((type (vg:obj-type obj)))
    (case type
      ((l)(vg:rect-get-extents obj))
      ((r)(vg:rect-get-extents obj))
      ((t)(vg:draw-text drawing obj draw: #f))
      (else #f))))

(define (vg:rect-get-extents obj)
  (vg:obj-pts obj)) ;; extents are just the points for a rectangle

;; with get-extents = #t return the extents
;; with draw = #f don't actually draw the object
;;
(define (vg:draw-obj drawing obj #!key (draw #t))
  ;; (print "obj type: " (vg:obj-type obj))
  (case (vg:obj-type obj)
    ((l)(vg:draw-line drawing obj draw: draw))
    ((r)(vg:draw-rect drawing obj draw: draw))
    ((t)(vg:draw-text drawing obj draw: draw))))

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

	(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-line! cnv llx lly ulx 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)))