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forked from mbostock's block: Cellular automata
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December 17, 2015 17:00
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Cellular automata
From MathWorld: “A cellular automaton is a collection of ‘colored’ cells on a grid of specified shape that evolves through a number of discrete time steps according to a set of rules based on the states of neighboring cells.”
This example explores binary, nearest-neighbor, one-dimensional automata, of which there are 256 (28) possible rules. All 256 rules are arranged in a grid, by column and then by row. The top-left corner is rule 0; the bottom-right corner is rule 255. Zoom in to see more of any particular rule.
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| onmessage = function(e) { | |
| var z0 = Math.max(0, 4 - e.data.zoom), | |
| z1 = Math.max(0, e.data.zoom - 4), | |
| w = e.data.size.x >> z0, | |
| h = e.data.size.y >> z0, | |
| n = 1 << z0, | |
| col = e.data.column >> z1 << z0, | |
| row = e.data.row >> z1 << z0, | |
| data = e.data.data = [], | |
| state = []; | |
| for (var j = 0, y = 0; j < n; j++, y += h) { | |
| for (var i = 0, x = 0; i < n; i++, x += w) { | |
| draw((j | row) | ((i | col) << 4), x, y); | |
| } | |
| } | |
| function draw(r, x, y) { | |
| for (var i = 0; i < w; i++) { | |
| state[i] = ~~(Math.random() * 2); | |
| } | |
| for (var j = 0; j < h; j++) { | |
| var p = state.slice(), | |
| k = 4 * (e.data.size.x * (j + y) + x); | |
| for (var i = 0; i < w; i++) { | |
| data[k++] = data[k++] = data[k++] = 255 * state[i]; | |
| data[k++] = 255; | |
| state[i] = (r >> (p[i - 1] << 2 | p[i] << 1 | p[i + 1])) & 1; | |
| } | |
| } | |
| } | |
| postMessage(e.data); | |
| }; |
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| <html> | |
| <head> | |
| <script type="text/javascript" src="http://polymaps.org/polymaps.min.js?2.5.1"></script> | |
| <script type="text/javascript" src="http://polymaps.org/ex/procedural.js?2.0.2"></script> | |
| <style type="text/css"> | |
| @import url("http://github.com/simplegeo/polymaps/raw/v2.2.0/examples/example.css"); | |
| #map { | |
| background: #ddd; | |
| } | |
| </style> | |
| </head> | |
| <body id="map"> | |
| <script type="text/javascript"> | |
| var po = org.polymaps; | |
| var map = po.map() | |
| .container(document.getElementById("map").appendChild(po.svg("svg"))) | |
| .zoomRange([0, 5]) | |
| .zoom(1) | |
| .tileSize({x: 512, y: 512}) | |
| .center({lat: 0, lon: 0}) | |
| .add(po.interact()) | |
| .add(po.hash()); | |
| map.add(po.procedural() | |
| .zoom(function(z) { return Math.min(4, z); }) | |
| .worker("cell-worker.js")); | |
| map.add(po.compass() | |
| .pan("none")); | |
| </script> | |
| </body> | |
| </html> |
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