chancejs

<html> <meta charset='utf-8'> <title>src/random.coffee</title> <head> <link rel='stylesheet' media='all' href='docco.css'> <link href='http://fonts.googleapis.com/css?family=Lato:300' rel='stylesheet' type='text/css'> <script src='http://code.jquery.com/jquery-1.6.2.min.js' type='text/javascript' charset='utf-8'></script> <script src='docco.js' type='text/javascript' charset='utf-8'></script> <script> $(document).ready(function(){ $('#menu').columnview(); $('#jump_show').click(function(){ $('#jump_to').toggleClass('visible') }) var p = "src/random.coffee".split('/') var f = p.pop() for(var i=0;i<p.length;i++){ var s = p[i] + "/" $("#jump_page div a span.label").filter(function(){ return $(this).text() == s }).parent().click() } $("#jump_page div a span.label").filter(function(){ return $(this).text() == f }).last().parent().toggleClass('active') }) </script> </head> <body> <div id='container'> <div id='jump_to'><div id='jump_page'> <ul class='menu' id='menu'> <li class='leaf'><a href='#'>src/</a><ul class='menu'><li class='leaf'><a href='src_random.html'>random.coffee</a></li><li class='leaf'><a href='#'>seeds/</a><ul class='menu'><li class='leaf'><a href='src_seeds_lagged_fibonnacci.html'>lagged_fibonnacci.coffee</a></li><li class='leaf'><a href='src_seeds_linear.html'>linear.coffee</a></li><li class='leaf'><a href='src_seeds_linear_congruential.html'>linear_congruential.coffee</a></li><li class='leaf'><a href='src_seeds_math_random.html'>math_random.coffee</a></li><li class='leaf'><a href='src_seeds_mersenne_twister.html'>mersenne_twister.coffee</a></li><li class='leaf'><a href='src_seeds_no_random.html'>no_random.coffee</a></li></ul></li></ul></li> </ul> </div> <div id='jump_show'> Jump To … </div></div> <table cellpadding='0' cellspacing='0'> <tr> <th class='docs'> <h3>src/</h3> <h1>random.coffee</h1> </th> <th class='code'> <pre></pre> </th> </tr> <tr> <td class='docs'></td> <td class='code'><div class="highlight"><pre>{floor, round} = Math class Random constructor: (@generator) -> get: -> @generator.get() boolean: (rate=0.5) -> rate = 0.5 unless 0 <= rate <= 1; @get() < rate bit: (rate=0.5) -> if @boolean rate then 1 else 0 sign: (rate=0.5) -> if @boolean rate then 1 else -1 char: (arg, rangeEnd) -> [arg, rangeEnd] = ['abcdefghijklmnopqrstuvwxyz', null] unless arg? switch typeof arg when 'string' if typeof rangeEnd is 'string' str = '' arg.to rangeEnd, (c) -> str += c arg = str arg.substr @intRandom(arg.length - 1), 1 when 'number' if typeof rangeEnd is 'number' n = String.fromCharCode floor @inRange arg, rangeEnd else String.fromCharCode @intRandom arg inRange: (a, b, c) -> res = a + @random b - a if typeof c is 'number' r = 1 / c res -= res % c unless floor(res * r) is res * r res = floor(res * 1000000000) / 1000000000 res inArray: (array, ratios, summed) -> if array? if ratios? if ratios.length isnt array.length throw new Error 'array and ratios arrays must have the same length' for b,i in ratios if i > 0 a = ratios[i-1] if a > b throw new Error 'ratios must be ordered when summed is true' if summed last = ratios[ratios.length-1] ratios = ratios.map (n) -> n / last else sum = ratios.reduce (a, b) -> a + b ratios = ratios.map (n) -> n / sum ratios[i] += ratios[i-1] for n,i in ratios when i > 0 rand = @get() return array[i] for v,i in ratios when rand <= v else array[@intRandom array.length - 1] else null in: (a, b, c) -> if arguments.length > 3 then @inArray arguments else switch typeof a when 'number' then @inRange a, b when 'string' then @inArray a, b, c when 'object' if Object::toString.call(a) == '[object Array]' @inArray a, b, c else if a.min? and a.max? then @inRange a.min, a.max, a.step else null sort: -> => @intPad 2 random: (amount) -> @get() * (amount or 1) intRandom: (amount) -> round @random amount pad: (amount) -> amount / 2 - @random amount intPad: (amount) -> round @pad amount module.exports = Random </pre></div></td> </tr> </table> </div> </body> </html>