58 lines
1.8 KiB
Plaintext
58 lines
1.8 KiB
Plaintext
;;;; animate.stk -- A simple image animation (Demo)
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;;;;
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;;;; Copyright © 1998-1999 Erick Gallesio - I3S-CNRS/ESSI <eg@unice.fr>
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;;;;
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;;;; Permission to use, copy, modify, distribute,and license this
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;;;; software and its documentation for any purpose is hereby granted,
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;;;; provided that existing copyright notices are retained in all
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;;;; copies and that this notice is included verbatim in any
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;;;; distributions. No written agreement, license, or royalty fee is
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;;;; required for any of the authorized uses.
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;;;;
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;;;; This software is provided ``AS IS'' without express or implied
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;;;; warranty.
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;;;;
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;;;;
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;;;; Author: Erick Gallesio [eg@unice.fr]
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;;;; Creation date: 9-Mar-1998 18:51
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;;;;Last file update: 3-Sep-1999 18:45 (eg)
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(define *img* #f)
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(define (make-animation pattern parent delay)
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(let* ((files (sort (glob pattern) string<?))
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(size (length files))
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(images (make-vector size))
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(name (gensym (& (if (eq? parent *root*) "" parent) ".l")))
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(widget (label name :bd 0 :relief "flat" :background "white"
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:env (the-environment))))
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;; Store in the image vector all the components of the animation
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(dotimes (i size)
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(let ((key (list-ref files i)))
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(vector-set! images
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i
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(make-image key :file key))))
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;; Display the first image of the animation
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(tk-set! widget :image (vector-ref images 0))
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;; Animate the image
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(letrec ((anim (let ((i 0))
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(lambda ()
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(if (>= delay 0)
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(when (winfo (quote exists) widget)
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(if (>= i size) (set! i 0))
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(tk-set! widget :image (vector-ref images i))
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(set! i (+ i 1))
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(update)
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(after (abs delay) anim))
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(after 100 anim))))))
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(after 'idle anim))
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widget))
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(define (change-animation-delay w delay)
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(let ((env (tk-get w :env)))
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(eval `(set! delay ,delay) env)))
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