;;
;; 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)
(defstruct vg:comp objs name file)
(defstruct vg:obj type pts fill-color text line-color call-back angle font attrib)
(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))
(define (vg:lib-new)
(make-vg:lib comps: (make-hash-table)))
(define (vg:drawing-new)
(make-vg:drawing scalex: 1
scaley: 1
xoff: 0
yoff: 0
libs: (make-hash-table)
insts: (make-hash-table)
cache: '()))
;;======================================================================
;; scaling and offsets
;;======================================================================
(define-inline (vg:scale-offset val s o)
(+ o (* val s)))
;; (* (+ o val) s))
;; apply scale and offset to a list of x y values
;;
(define (vg:scale-offset-xy lstxy sx sy ox oy)
(if (> (length lstxy) 1) ;; have at least one xy pair
(let loop ((x (car lstxy))
(y (cadr lstxy))
(tal (cddr lstxy))
(res '()))
(let ((newres (cons (vg:scale-offset y sy oy)
(cons (vg:scale-offset x sx ox)
res))))
(if (> (length tal) 1)
(loop (car tal)(cadr tal)(cddr tal) newres)
(reverse newres))))
'()))
;; apply drawing offset and scaling to the points in lstxy
;;
(define (vg:drawing-apply-scale drawing lstxy)
(vg:scale-offset-xy
lstxy
(vg:drawing-scalex drawing)
(vg:drawing-scaley drawing)
(vg:drawing-xoff drawing)
(vg:drawing-yoff drawing)))
;; apply instance offset and scaling to the points in lstxy
;;
(define (vg:inst-apply-scale inst lstxy)
(vg:scale-offset-xy
lstxy
(vg:inst-scalex inst)
(vg:inst-scaley inst)
(vg:inst-xoff inst)
(vg:inst-yoff inst)))
;; apply both drawing and instance scaling to a list of xy points
;;
(define (vg:drawing-inst-apply-scale-offset drawing inst lstxy)
(vg:drawing-apply-scale
drawing
(vg:inst-apply-scale inst lstxy)))
;;======================================================================
;; objects
;;======================================================================
;; (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))
(make-vg:obj type: 'r pts: (list x1 y1 x2 y2) text: #f line-color: line-color fill-color: fill-color))
;; 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
line-color: line-color fill-color: fill-color
angle: angle font: font
attributes: (vg:make-attrib 'font-size font-size)))
;;======================================================================
;; obj modifiers and queries
;;======================================================================
;; get extents, use knowledge of type ...
;;
(define (vg:obj-get-extents drawing obj)
(let ((type (vg:obj-type obj)))
(case type
((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
(define (vg:grow-rect borderx bordery x1 y1 x2 y2)
(list
(- x1 borderx)
(- y1 bordery)
(+ x2 borderx)
(+ y2 bordery)))
(define (vg:make-attrib . attrib-list)
#f)
;;======================================================================
;; components
;;======================================================================
;; add obj to comp
;;
(define (vg:add-objs-to-comp comp . objs)
(vg:comp-objs-set! comp (append (vg:comp-objs comp) objs)))
;; use the struct. leave this here to remind of this!
;;
;; (define (vg:comp-get-objs comp)
;; (vg:comp-objs comp))
;; add comp to lib
;;
(define (vg:add-comp-to-lib lib compname comp)
(hash-table-set! (vg:lib-comps lib) compname comp))
;; instanciate component in drawing
;;
(define (vg:instantiate drawing libname compname instname xoff yoff #!key (theta 0)(scalex 1)(scaley 1)(mirrx #f)(mirry #f))
(let ((inst (make-vg:inst libname: libname compname: compname xoff: xoff yoff: yoff theta: theta scalex: scalex scaley: scaley mirrx: mirrx mirry: mirry)) )
(hash-table-set! (vg:drawing-insts drawing) instname inst)))
;; get component from drawing (look in apropriate lib) given libname and compname
(define (vg:get-component drawing libname compname)
(let* ((lib (hash-table-ref (vg:drawing-libs drawing) libname))
(inst (hash-table-ref (vg:lib-comps lib) compname)))
inst))
(define (vg:components-get-extents drawing . comps)
(let ((llx #f)
(lly #f)
(ulx #f)
(uly #f))
(for-each
(lambda (comp)
(let ((objs (vg:comp-objs comp)))
(for-each
(lambda (obj)
(let* ((extents (vg:obj-get-extents drawing obj))
(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))))
objs)))
comps)
(list llx lly ulx uly)))
;;======================================================================
;; libraries
;;======================================================================
;; register lib with drawing
;;
(define (vg:add-lib drawing libname lib)
(hash-table-set! (vg:drawing-libs drawing) libname lib))
(define (vg:get-lib drawing libname)
(hash-table-ref/default (vg:drawing-libs drawing) libname #f))
(define (vg:get/create-lib drawing libname)
(let ((lib (vg:get-lib drawing libname)))
(if lib
lib
(let ((newlib (vg:lib-new)))
(vg:add-lib drawing libname newlib)
newlib))))
;;======================================================================
;; map objects given offset, scale and mirror, resulting obj is displayed
;;======================================================================
;; dispatch the drawing of obj off to the correct drawing routine
;;
(define (vg:map-obj drawing inst obj)
(case (vg:obj-type obj)
((r)(vg:map-rect drawing inst obj))
((t)(vg:map-text drawing inst obj))
(else #f)))
;; given a drawing and a inst map a rectangle to it screen coordinates
;;
(define (vg:map-rect drawing inst obj)
(let ((res (make-vg:obj type: 'r
fill-color: (vg:obj-fill-color obj)
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))
;; given a drawing and a inst map a text to it screen coordinates
;;
(define (vg:map-text drawing inst obj)
(let ((res (make-vg:obj type: 't
fill-color: (vg:obj-fill-color obj)
text: (vg:obj-text obj)
line-color: (vg:obj-line-color obj)
font: (vg:obj-font obj)
angle: (vg:obj-angle obj)
attrib: (vg:obj-attrib 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)))
;;======================================================================
;; color
;;======================================================================
(define (vg:rgb->number r g b #!key (a 0))
(bitwise-ior
(arithmetic-shift a 24)
(arithmetic-shift r 16)
(arithmetic-shift g 8)
b))
(define (vg:iup-color->number iup-color)
(apply vg:rgb->number (map string->number (string-split iup-color))))
;;======================================================================
;; 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))
((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* ((cnv (vg:drawing-cnv drawing))
(pts (vg:drawing-apply-scale drawing (vg:obj-pts obj)))
(fill-color (vg:obj-fill-color obj))
(line-color (vg:obj-line-color obj))
(llx (car pts))
(lly (cadr pts))
(ulx (caddr pts))
(uly (cadddr pts))
(w (- ulx llx))
(h (- uly lly)))
(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)))
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)))
(text (vg:obj-text obj))
(font (vg:obj-font obj))
(fill-color (vg:obj-fill-color obj))
(line-color (vg:obj-line-color obj))
(llx (car pts))
(lly (cadr pts)))
(if draw
(let* ((prev-background-color (canvas-background cnv))
(prev-foreground-color (canvas-foreground cnv))
(prev-font (canvas-font cnv))
(font-changed (and font (not (equal? font prev-font)))))
(if line-color
(canvas-foreground-set! cnv line-color)
(if fill-color
(canvas-foreground-set! cnv prev-foreground-color)))
(if font-changed (canvas-font-set! cnv font))
(canvas-text! cnv llx lly text)
;; NOTE: we do not set the font back!!
(canvas-foreground-set! cnv prev-foreground-color)))
(if cnv
(let-values (((xmax ymax)(canvas-text-size cnv text)))
(append pts (list (+ llx xmax)(+ lly ymax)))) ;; will be wrong if text is rotated?
(append pts pts))))
(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))))