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| <!doctype html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <style> | |
| </style> | |
| </head> | |
| <body> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script type="text/coffeescript" src="script.coffee"></script> | |
| <script src="http://coffeescript.org/extras/coffee-script.js"></script> | |
| </body> | |
| </html> |
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| class LCG | |
| constructor: (@seed) -> | |
| @modulus = 4294967295 | |
| @multiplier = 1664525 | |
| @increment = 1013904223 | |
| unless @seed? && 0 <= seed < @modulus | |
| @seed = (new Date().valueOf() * new Date().getMilliseconds()) % @modulus | |
| randn: -> | |
| @seed = (@multiplier * @seed + @increment) % @modulus | |
| randf: -> | |
| @randn() / @modulus | |
| rand: (n) -> | |
| Math.floor(@randf() * n) | |
| rand2: (min, max) -> | |
| min + @rand(max - min) | |
| genData = -> | |
| data = [] | |
| for j in [0...numRows] | |
| for i in [0...numColumns] | |
| data.push | |
| key: "#{i},#{j}" | |
| x: i | |
| y: j | |
| value: random.rand(255) | |
| data | |
| random = new LCG | |
| boxSize = 32 | |
| width = 960 | |
| height = 480 | |
| numColumns = width / boxSize | |
| numRows = height / boxSize | |
| initialData = genData() | |
| svg = d3.select('body').append('svg') | |
| .attr('width', 960) | |
| .attr('height', 480) | |
| update = -> | |
| rects = svg.selectAll('rect') | |
| .data(genData(), (d) -> d.key) | |
| # tag the existing elements to update | |
| rects.attr('class', 'update') | |
| .transition() | |
| .duration(750) | |
| .style('opacity', (d) -> d.value / 255) | |
| # create the new elements | |
| rects.enter().append('rect') | |
| .attr('class', 'enter') | |
| .attr('x', (d) -> d.x * boxSize) | |
| .attr('y', (d) -> d.y * boxSize) | |
| .attr('width', boxSize) | |
| .attr('height', boxSize) | |
| .style('opacity', 1e-6) | |
| .transition() | |
| .duration(750) | |
| .style('opacity', (d) -> d.value / 255) | |
| rects.exit() | |
| .attr('class', 'exit') | |
| .remove() | |
| update() | |
| # Run every 1.5 secodns for 15 seconds | |
| _interval = setInterval update, 1500 | |
| setTimeout (-> clearInterval _interval), 15000 |
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