stk/STklos/Examples/E3.stklos

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;;;;
;;;; E x a m p l e 3 . s t k
;;;;
;;;; Copyright (C) 1993,1994,1995 Erick Gallesio - I3S-CNRS/ESSI <eg@unice.fr>
;;;;
;;;; Permission to use, copy, and/or distribute this software and its
;;;; documentation for any purpose and without fee is hereby granted, provided
;;;; that both the above copyright notice and this permission notice appear in
;;;; all copies and derived works. Fees for distribution or use of this
;;;; software or derived works may only be charged with express written
;;;; permission of the copyright holder.
;;;; This software is provided ``as is'' without express or implied warranty.
;;;;
;;;; Author: Erick Gallesio [eg@kaolin.unice.fr]
;;;; Creation date: 4-Aug-1994 17:33
;;;; Last file update: 5-Aug-1994 12:04
;;;;
;;;; This file demonstates the use of grouped canvas items.
;;;; Grouping can be viewed
;;;; - statically by defining a class which is the composition of
;;;; several items (such as <Chair> or <Table> classes below)
;;;; - dynamically by making a <Canvas-group> instance
;;;; of several items (such as the red-group below)
(require "Canvas")
;;;; Create canvas
(define c (make <Canvas> :width 800 :height 600))
(pack c)
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;
;;;; The <Table> class
;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(define-class <Table> (<Tk-composite-item>)
(deck f1 f2
(fill :init-keyword :fill
:accessor fill
:allocation :propagated
:propagate-to (deck f1 f2))))
(define-method initialize-item ((self <Table>) canvas coords args)
(let* ((parent (slot-ref self 'parent))
(x (car coords))
(y (cadr coords))
(deck (make <Line> :parent parent :width 8
:coords (list x y (+ x 200) y)))
(f1 (make <Polygon> :parent parent
:coords (list (+ x 40) y (+ x 20) (+ y 150)
(+ x 25) (+ y 150) (+ x 55) y)))
(f2 (make <Polygon> :parent parent
:coords (list (+ x 160) y (+ x 180) (+ y 150)
(+ x 175) (+ y 150) (+ x 145) y))))
(let ((Cid (gensym "group")))
;; Initialize true slots
(slot-set! self 'Cid Cid)
(slot-set! self 'deck deck)
(slot-set! self 'f1 f1)
(slot-set! self 'f2 f2)
;; Add the deck f1 f2 components to the "Group" whith tag "Cid"
(add-to-group self deck f1 f2)
;; Give this association a default binding allowing it to be moved with mouse
(bind-for-dragging parent :tag Cid :only-current #f)
;; Return Cid
Cid)))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;
;;;; The <Chair> class
;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(define-class <Chair> (<Tk-composite-item>)
(deck back f1 f2
(fill :init-keyword :fill
:accessor fill
:allocation :propagated
:propagate-to (deck back f1 f2))))
(define-method initialize-item ((self <Chair>) canvas coords args)
(let* ((parent (slot-ref self 'parent))
(x (car coords))
(y (cadr coords))
(deck (make <Line> :parent parent :width 8
:coords (list x y (+ x 100) y)))
(back (make <Line> :parent parent :width 5
:coords (list (+ x 70) y (+ x 100) (- y 90))))
(f1 (make <Polygon> :parent parent
:coords (list (+ x 20) y x (+ y 90)
(+ x 5) (+ y 90) (+ x 30) y)))
(f2 (make <Polygon> :parent parent
:coords (list (+ x 80) y (+ x 100) (+ y 90)
(+ x 95) (+ y 90) (+ x 70) y))))
(let ((Cid (gensym "group")))
;; Initialize true slots
(slot-set! self 'Cid Cid)
(slot-set! self 'deck deck)
(slot-set! self 'back back)
(slot-set! self 'f1 f1)
(slot-set! self 'f2 f2)
;; Add the deck f1 f2 components to the "Group" whith tag "Cid"
(add-to-group self deck back f1 f2)
;; Give this association a default binding allowing it to be moved with mouse
(bind-for-dragging parent :tag Cid :only-current #f)
;; Return Cid
Cid)))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;; Define a table and two chairs
(define t1 (make <Table> :parent c :coords '(120 50) :fill "red"))
(define c1 (make <Chair> :parent c :coords '(320 110) :fill "green"))
(define c2 (make <Chair> :parent c :coords '(450 110) :fill "red"))
;;;; Define the group of red objects
(define red-group (make <Canvas-group> :parent c))
(add-to-group red-group t1 c2)
;;;; Using button 2 of the mouse will move all the components of the red-group
(bind-for-dragging c :tag (Cid red-group) :button 2 :only-current #f)
;;;; Zoom in and out the red-group
(update)
(dotimes (i 20)
(rescale red-group 0 0 0.9 0.9)
(update))
(dotimes (i 20)
(rescale red-group 0 0 1.1 1.1)
(update))
(update)
(delay 1000)