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Message from discussion Stupid binary clock
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Bulent Murtezaoglu  
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 More options Sep 26 2005, 8:39 pm
Newsgroups: comp.lang.lisp
From: Bulent Murtezaoglu <b...@acm.org>
Date: Tue, 27 Sep 2005 03:39:30 +0300
Local: Mon, Sep 26 2005 8:39 pm
Subject: Re: Stupid binary clock
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>>>>> "ES" == Emre Sevinc <em...@bilgi.edu.tr> writes:

[...]
    ES> BTW, having "circle-shaped" LEDs would look much nicer I guess
    ES> (similar to what we see at ThinkGeek watches and clocks). ;-)

Not only does he get tech support, Emre also gets his wishes tonight.  
Here's the little hack he got:

(let ((quadric-ht (make-hash-table :test #'equal)))
  (defun draw-led (x y on/off)
    (flet ((make-led (x y)
             (let ((tl (gethash (list x y) quadric-ht)))
               (if tl tl
                   (setf (gethash (list x y) quadric-ht)
                         (glu:new-quadric))))))
      (gl:color-3f 0f0 (if on/off 1f0 0.5f0) 0f0)
      (gl:push-matrix)
      (gl:translate-f (float x) (float y) 0.0)
      (glu:partial-disk (make-led x y) 0.0d0 (float *led-size* 0.0d0) 32 1 0.0d0 360.0d0)
      (gl:pop-matrix))))

Dunno how this fits in with the rest of the code, but it seems to work
OK. (There doesn't seem to be a glu:disk in my cl-sdl.  That's how partial
disk got in there.)

BM


 
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