Created
October 7, 2012 06:17
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In "Notes on the Synthesis of Form" Christopher Alexander describes a thought experiment of light bulbs turning on and off. This script implements that thought experiment.
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| <!DOCTYPE html> | |
| <html><head> | |
| <style> | |
| .light { position:absolute; border-radius:5px; background:black; } | |
| .light.on { background:yellow; } | |
| </style> | |
| </head><body> | |
| <div id="lights"></div> | |
| <script src="http://code.jquery.com/jquery-1.8.2.min.js"></script> | |
| <script> | |
| $(function() { | |
| var elements = new Array(100) | |
| var size = 8 | |
| var pad = 3 | |
| var margin = 20 | |
| $.each(elements, function(i) { | |
| elements[i] = $('<div></div>') | |
| .addClass('light') | |
| .css({ width:size, height:size, top:100, left:margin + (size + pad*2)*i }) | |
| .appendTo('#lights') | |
| // .addClass(chance() ? 'on' : 'off') | |
| .addClass('on') | |
| }) | |
| renderAndUpdate() | |
| var interval = setInterval(renderAndUpdate, 500) | |
| function renderAndUpdate() { | |
| var $lights = $('#lights .light') | |
| var lastWasOn = false | |
| var oneWasOn = true | |
| $lights.each(function(i, el) { | |
| var $el = $(el) | |
| if ($el.hasClass('on')) { | |
| lastWasOn = true | |
| oneWasOn = true | |
| if (chance()) { $el.removeClass('on') } | |
| } else { | |
| lastWasOn = false | |
| if (lastWasOn || $($lights[i + 1]).hasClass('on')) { | |
| if (chance()) { $el.addClass('on') } | |
| } | |
| } | |
| }) | |
| if (!oneWasOn) { | |
| clearInterval(interval) | |
| } | |
| } | |
| }) | |
| function chance() { return Math.random() < 0.5 } | |
| </script> | |
| </body></html> |
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