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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)
-
-
-
-