JS1k Entry

Posted on 2010-08-21 in javascript

Paul Hammond’s 640 byte cellular automata inspired me to put something together for JS1k, the 1k Javascript demo contest.

You get to use a canvas element, which makes a lot of things possible — there have been some amazingly impressive entries. I decided to keep mine simple, and remembered a 2d rippling-water simulation I saw in Game Developer about 11 years ago. Here’s the basic algorithm I used, in this case explained by Hugo Elias. It’s based on a cellular automata height map, rendered using both refraction and faked 1d environment map components, which I combine in evil ways into a 6-digit hex color code for drawing each pixel.

The compressed code weighs in at 660 bytes, and here is the slightly less illegible uncompressed version. Total development time around 5 hours.

The demo itself is fast in the latest Opera and Chrome, slow in Safari 5, and almost inert in Firefox 3.6. Maybe I can optimise it a bit. Take a look and let me know what you think.

Written by phil on August 21st, 2010

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2 Responses to 'JS1k Entry'

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  1. Nice entry! It’s pretty simple, as you said, but the effect is really neat! Keep up the good work.

    Oh, and FYI you have a double “http://” in the link to the js1k demos list. ;)

    FireFly

    26 Sep 10 at 11:41 am

  2. I was very inspired by your js1k project. So I built 2 versions in flash. One of them uses Pixel bender and theoretically runs on the GPU.
    They are at http://www.m0ose.com/flash/waterAutomata/bin-release/aqua2.html and http://www.m0ose.com/flash/waterAutomata/bin-release/agua.html

    cody

    28 Oct 10 at 12:35 am

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