55 lines
1.3 KiB
Scheme
55 lines
1.3 KiB
Scheme
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#!/bin/sh
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../../scx <<EOF
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,batch on
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,open xlib
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,batch off
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(define (picture point-count)
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(let* ((dpy (open-display))
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(width 400)
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(height 400)
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(black (black-pixel dpy))
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(white (white-pixel dpy))
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(root (display-root-window dpy))
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(win (create-window root width height
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'background-pixel white
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'event-mask '(exposure button-press)))
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(gc (create-gcontext win
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'background white 'foreground black)))
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(map-window win)
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(let event-loop ()
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(let ((e (next-event dpy)))
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(if
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(case (event-type e)
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((expose) (begin
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(clear-window win)
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(draw-points win gc point-count 0 0
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(/ width 2) (/ height 2))
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(draw-poly-text win gc 10 10 "Click a button to exit"
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'1-byte)
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#f))
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(else #t))
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#t
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(event-loop))))
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(close-display dpy)))
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(define (draw-points win gc count x y hw hh)
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(if (zero? (modulo count 100))
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(display-flush-output (window-display win)))
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(if (not (zero? count))
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(let ((xf (floor (* (+ 1.2 x) hw ))) ; These lines center the picture
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(yf (floor (* (+ 0.5 y) hh ))))
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(draw-point win gc (cons (inexact->exact xf) (inexact->exact yf)))
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(draw-points win gc (- count 1)
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(- (* y (+ 1 (sin (* 0.7 x)))) (* 1.2 (sqrt (abs x))))
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(- 0.21 x)
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hw hh))))
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(picture 1000)
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,exit
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y
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EOF
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