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Welcome to my blog, which was once a mailing list of the same name and is still generated by mail. Please reply via the "comment" links.

Always interested in offers/projects/new ideas. Eclectic experience in fields like: numerical computing; Python web; Java enterprise; functional languages; GPGPU; SQL databases; etc. Based in Santiago, Chile; telecommute worldwide. CV; email.

Personal Projects

Lepl parser for Python.

Colorless Green.

Photography around Santiago.

SVG experiment.

Professional Portfolio

Calibration of seismometers.

Data access via web services.

Cache rewrite.

Extending OpenSSH.

C-ORM: docs, API.

Last 100 entries

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© 2006-2015 Andrew Cooke (site) / post authors (content).

First napito Results

From: "andrew cooke" <andrew@...>

Date: Sat, 8 Sep 2007 05:53:40 -0400 (CLT)

Got the first graphics out of my new art project (napito - posted some of
the scheme code earlier).  There's still a lot to do, but I am really
pleased at how this looks - there's a "black and white line plot"
aesthetic with Op Art vibes.


So far I have support for plotting lines and polygons (and transforming
the coordinate system), and for generating the bounding boxes.  Next I
need to do the dynamics (collision detection and physics being the hardest

The code to generate the above is:

(let* ((line (ln-line 1 1 0 '(1 0) '(-0.2 2 0) '(0.1 0)))
       (rotation (ln-rotation-coverage line 0 9))
       (path (ln-path-coverage line 0 9))
       (border (ln-border line 0 9))
       (engine (nap-ps-engine '()))
       (sample (map nap-line (ln-sample line 0 9.05 0.1))))
  (nap-generate engine (nap-series*
                        (nap-shift-x 2)
                        (nap-shift-y 2)
                        (nap-scale 0.5)
                         (nap-polygon rotation)
                         (nap-polygon path)
                         (nap-polygon border)
                         (nap-series sample)

Where the shift/scale is necessary as I don't have any default transforms
configured (so the initial coord system is Postscript's default).


PS For the record, just dumped Mefi again.  Was an error to go back. 
Don't clearly understand what it is about that place.  Anyway, asked for
account to be cancelled and blocked DNS.

Collision Detection Working

From: "andrew cooke" <andrew@...>

Date: Sun, 9 Sep 2007 12:15:08 -0400 (CLT)

Just got this working too.  See

The process is:
- for a particular time interval calculate all bounding boxes and identify
  interacting lines
- repeatedly divide the interval in two until we find the first interacting
- continue halving the interval down to some time limit
- use an iterated first order solution to find all possible candidates
  (there are four line ends, each will at some point(s) intersect the
  extended other line)
- filter candidates based on time interval
- score candidates by time order and geometry
- select best scoring candidate


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