Modularized panels

2013-01-29 10:05:02 -07:00
parent 59503c5e22
commit b3052d0c95
41 changed files with 2108 additions and 759 deletions
@@ -0,0 +1,65 @@
+/*jshint node:true, laxcomma:true */
+"use strict";
+
+var debug = require('debug')('rwc');
+
+var RandomWeightedChoice = function (table, temperature, randomFunction, influence) {
+  influence = influence || 2; // Seems fine, difficult to tune
+  if (typeof(temperature)=="undefined") temperature =  50; // in [0,100], 50 is neutral
+  temperature = temperature | 50;
+  debug('temperature', temperature);
+  var T = (temperature - 50) / 50;
+  if (typeof(randomFunction)=="undefined") randomFunction = Math.random;
+
+  var nb = table.length;
+  if(!nb) return null; // No item given.
+
+  var total = 0;
+  table.forEach(function(element, index) {
+    total += element.weight;
+  });
+
+  var avg = total / nb;
+  debug('total', total);
+  debug('nb', nb);
+  debug('avg', avg);
+
+  // Compute amplified urgencies (depending on temperature)
+  var ur = {};
+  var urgencySum = 0;
+  table.forEach(function(element, index) {
+    var urgency = element.weight + T * influence * (avg - element.weight);
+    if (urgency < 0) urgency = 0;
+    urgencySum += urgency;
+    ur[element.id] = (ur[element.id] || 0 ) + urgency;
+  });
+
+  var cumulatedUrgencies = {};
+  var currentUrgency = 0;
+  Object.keys(ur).forEach(function(id, index) {
+    currentUrgency += ur[id];
+    cumulatedUrgencies[id] = currentUrgency;
+  });
+
+  if(urgencySum < 1) return null; // No weight given
+
+  // Choose
+  var choice = randomFunction() * urgencySum;
+
+  debug('ur', ur);
+  debug('cumulatedUrgencies', cumulatedUrgencies);
+  debug('urgencySum', urgencySum);
+  debug('choice', choice);
+
+  var ids = Object.keys(cumulatedUrgencies);
+  for(var i=0; i<ids.length; i++) {
+    var id = ids[i];
+    var urgency = cumulatedUrgencies[id];
+    if(choice <= urgency) {
+      debug('return', id);
+      return id;
+    }    
+  }
+};
+
+module.exports = RandomWeightedChoice;