Megatest

(use canvas-draw iup)
(import canvas-draw-iup)

(load "vg.scm")

(use trace)
(trace vg:draw-rect)
(define d1 (vg:drawing-new))
(define l1 (vg:lib-new))
(define c1 (vg:comp-new))
(define c2 (vg:comp-new))
(let ((r1 (vg:make-rect 20 20 40 40))
      (r2 (vg:make-rect 40 40 80 80)))
  (vg:add-objs-to-comp c1 r1 r2))

;; 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)

;; instantiate firstlib/firstcomp as inst1 in drawing d1 at 0,0
(vg:instantiate d1 "firstlib" "firstcomp" "inst1" 0 0)
(vg:instantiate d1 "firstlib" "firstcomp" "inst2" 200 200)

;; (vg:drawing-scalex-set! d1 1.1)
;; (vg:drawing-scaley-set! d1 0.5)

;; (define xtnts (vg:scale-offset-xy 
;; 	       (vg:component-get-extents c1)
;; 	       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 c1)))
(vg:add-objs-to-comp c1 (apply vg:make-rect xtnts))

;; 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 1.8)
(vg:drawing-scaley-set! d1 1.1)

(define cnv #f)
(define the-cnv (canvas 
		 #:size "500x400"
		 #:expand "YES"
		 #:scrollbar "YES"
		 #:posx "0.5"
		 #:posy "0.5"
		 #:action (make-canvas-action
			   (lambda (c xadj yadj)
			     (set! cnv c)))))

(show
 (dialog
  (vbox
   the-cnv)))

(vg:drawing-cnv-set! d1 cnv)
(vg:draw d1 #t)

;; (canvas-rectangle! cnv  10 100 10 80)

(main-loop)

;;
;; Copyright 2016  Matthew Welland.
;; 
;;  This program is made available under the GNU GPL version 2.0 or
;;  greater. See the accompanying file COPYING for details.
;; 
;;  This program is distributed WITHOUT ANY WARRANTY; without even the
;;  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
;;  PURPOSE.

;;  strftime('%m/%d/%Y %H:%M:%S','now','localtime')

(use defstruct srfi-1)

(declare (unit vg))
(use canvas-draw iup)
(import canvas-draw-iup)
;; structs
;;
(defstruct vg:lib     comps)

			  text:       (vg:obj-text       obj)
			  line-color: (vg:obj-line-color obj)
			  font:       (vg:obj-font       obj)))
	(pts (vg:obj-pts obj)))
    (vg:obj-pts-set! res (vg:drawing-inst-apply-scale-offset drawing inst pts))
    (vg:drawing-cache-set! drawing (cons res (vg:drawing-cache drawing) ))
    res))

;;======================================================================
;; instances
;;======================================================================

(define (vg:instances-get-extents drawing . instance-names)
  (let ((xtnt-lst (vg:draw drawing #f))
	(llx   #f)
	(lly   #f)
	(ulx   #f)
	(uly   #f))
    (for-each
     (lambda (extents)
       (let* ((ollx      (list-ref extents 0))
	      (olly      (list-ref extents 1))
	      (oulx      (list-ref extents 2))
	      (ouly      (list-ref extents 3)))
	 (if (or (not llx)(< ollx llx))(set! llx ollx))
	 (if (or (not lly)(< olly lly))(set! lly olly))
	 (if (or (not ulx)(> oulx ulx))(set! ulx oulx))
	 (if (or (not uly)(> ouly uly))(set! uly ouly))))
     xtnt-lst)
    (list llx lly ulx uly)))


;;======================================================================
;; Unravel and draw the objects
;;======================================================================

;; 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)
    ((r)(vg:draw-rect 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* ((cnv (vg:drawing-cnv drawing))
	 (pts (vg:drawing-apply-scale drawing (vg:obj-pts obj)))
	 (llx (car pts))
	 (lly (cadr pts))
	 (ulx (caddr pts))
	 (uly (cadddr pts)))

    (if draw (canvas-rectangle! cnv llx ulx lly uly))
    pts)) ;; return extents

(define (vg:draw drawing draw-mode . instnames)
  (let ((insts (vg:drawing-insts drawing))
	(res   '()))
    (for-each 
     (lambda (instname)
       (let* ((inst     (hash-table-ref insts instname))
	      (libname  (vg:inst-libname inst))
	      (compname (vg:inst-compname inst))
	      (comp     (vg:get-component drawing libname compname)))
	 (print "comp: " comp)
	 (for-each
	  (lambda (obj)
	    (print "obj: " (vg:obj-pts obj))
	    (let ((obj-xfrmd (vg:map-obj drawing inst obj)))
	      (print "obj-xfrmd: " (vg:obj-pts obj-xfrmd))
	      (set! res (cons (vg:draw-obj drawing obj-xfrmd draw: draw-mode) res)))) ;;
	  (vg:comp-objs comp))))
     (if (null? instnames)
	 (hash-table-keys insts)
	 instnames))
    res)) ;;  (hash-table-values insts))))