Andrew Cooke | Contents | Latest | RSS | Previous | Next

C[omp]ute

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

Choochoo Training Diary

Last 100 entries

[Programming] React Leaflet; AliExpress Independent Sellers; Applebaum - Twilight of Democracy; [Politics] Back + US Elections; [Programming,Exercise] Simple Timer Script; [News] 2019: The year revolt went global; [Politics] The world's most-surveilled cities; [Bike] Hope Freehub; [Restaurant] Mama Chau's (Chinese, Providencia); [Politics] Brexit Podcast; [Diary] Pneumonia; [Politics] Britain's Reichstag Fire moment; install cairo; [Programming] GCC Sanitizer Flags; [GPU, Programming] Per-Thread Program Counters; My Bike Accident - Looking Back One Year; [Python] Geographic heights are incredibly easy!; [Cooking] Cookie Recipe; Efficient, Simple, Directed Maximisation of Noisy Function; And for argparse; Bash Completion in Python; [Computing] Configuring Github Jekyll Locally; [Maths, Link] The Napkin Project; You can Masquerade in Firewalld; [Bike] Servicing Budget (Spring) Forks; [Crypto] CIA Internet Comms Failure; [Python] Cute Rate Limiting API; [Causality] Judea Pearl Lecture; [Security, Computing] Chinese Hardware Hack Of Supermicro Boards; SQLAlchemy Joined Table Inheritance and Delete Cascade; [Translation] The Club; [Computing] Super Potato Bruh; [Computing] Extending Jupyter; Further HRM Details; [Computing, Bike] Activities in ch2; [Books, Link] Modern Japanese Lit; What ended up there; [Link, Book] Logic Book; Update - Garmin Express / Connect; Garmin Forerunner 35 v 230; [Link, Politics, Internet] Government Trolls; [Link, Politics] Why identity politics benefits the right more than the left; SSH Forwarding; A Specification For Repeating Events; A Fight for the Soul of Science; [Science, Book, Link] Lost In Math; OpenSuse Leap 15 Network Fixes; Update; [Book] Galileo's Middle Finger; [Bike] Chinese Carbon Rims; [Bike] Servicing Shimano XT Front Hub HB-M8010; [Bike] Aliexpress Cycling Tops; [Computing] Change to ssh handling of multiple identities?; [Bike] Endura Hummvee Lite II; [Computing] Marble Based Logic; [Link, Politics] Sanity Check For Nuclear Launch; [Link, Science] Entropy and Life; [Link, Bike] Cheap Cycling Jerseys; [Link, Music] Music To Steal 2017; [Link, Future] Simulated Brain Drives Robot; [Link, Computing] Learned Index Structures; Solo Air Equalization; Update: Higher Pressures; Psychology; [Bike] Exercise And Fuel; Continental Race King 2.2; Removing Lowers; Mnesiacs; [Maths, Link] Dividing By Zero; [Book, Review] Ray Monk - Ludwig Wittgenstein: The Duty Of Genius; [Link, Bike, Computing] Evolving Lacing Patterns; [Jam] Strawberry and Orange Jam; [Chile, Privacy] Biometric Check During Mail Delivery; [Link, Chile, Spanish] Article on the Chilean Drought; [Bike] Extended Gear Ratios, Shimano XT M8000 (24/36 Chainring); [Link, Politics, USA] The Future Of American Democracy; Mass Hysteria; [Review, Books, Links] Kazuo Ishiguro - Never Let Me Go; [Link, Books] David Mitchell's Favourite Japanese Fiction; [Link, Bike] Rear Suspension Geometry; [Link, Cycling, Art] Strava Artwork; [Link, Computing] Useful gcc flags; [Link] Voynich Manuscript Decoded; [Bike] Notes on Servicing Suspension Forks; [Links, Computing] Snap, Flatpack, Appimage; [Link, Computing] Oracle is leaving Java (to die); [Link, Politics] Cubans + Ultrasonics; [Book, Link] Laurent Binet; VirtualBox; [Book, Link] No One's Ways; [Link] The Biggest Problem For Cyclists Is Bad Driving; [Computing] Doxygen, Sphinx, Breathe; [Admin] Brokw Recent Permalinks; [Bike, Chile] Buying Bearings in Santiago; [Computing, Opensuse] Upgrading to 42.3; [Link, Physics] First Support for a Physics Theory of Life; [Link, Bike] Peruvian Frame Maker; [Link] Awesome Game Theory Tit-For-Tat Thing; [Food, Review] La Fabbrica - Good Italian Food In Santiago; [Link, Programming] MySQL UTF8 Broken; [Link, Books] Latin American Authors

© 2006-2017 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.

http://www.acooke.org/cgi/photo.py?start=napito

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
part).

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-parallel*
                         (nap-polygon rotation)
                         (nap-polygon path)
                         (nap-polygon border)
                         (nap-series sample)
                         )
                        (nap-close))))

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

Andrew

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
http://www.acooke.org/cgi/photo.py?start=napito-2

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
  pair
- 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

Andrew

Comment on this post