31 lines
1.3 KiB
Plaintext
31 lines
1.3 KiB
Plaintext
;;;;
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;;;; STk adaptation of the Tk widget demo.
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;;;;
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;;;; This demonstration script shows an example with a vertical scale.
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;;;;
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(define (demo-vscale)
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(define (set-height! c poly line height)
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(let* ((height (+ height 21))
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(y2 (max (- height 30) 21)))
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(set! (coords poly) (list 15 20 35 20 35 y2 45 y2 25 height 5 y2 15 y2 15 20))
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(set! (coords line) (list 15 20 35 20 35 y2 45 y2 25 height 5 y2 15 y2 15 20))))
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(let* ((w (make-demo-toplevel "vscale"
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"Vertical Scale Demonstration"
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"An arrow and a vertical scale are displayed below. If you click or drag mouse button 1 in the scale, you can change the size of the arrow."))
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(f (make <Frame> :parent w :border-width 10))
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(c (make <Canvas> :parent f :width 50 :height 50 :border-width 0
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:highlight-thickness 0))
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(poly (make <Polygon> :parent c :coords '(0 0 1 1 2 2) :fill "SeaGreen3"))
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(line (make <Line> :parent c :coords '(0 0 1 1 2 2 0 0) :fill "black"))
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(s (make <Scale> :parent f :orientation "vertical" :scale-length 284
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:from 0 :to 250
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:tick-interval 50 :value 75
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:command (lambda (v) (set-height! c poly line v)))))
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(pack f)
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(pack s :side "left" :anchor "ne")
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(pack c :side "left" :anchor "nw" :fill "y")))
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