gistfile1.txt

calculateBreaks: function( features, mean, stdev ){
      var self = this
      var type = self.options[self.class_type].classificationType;
      var range = self.options[self.class_type].range;
      var n = self.options[self.class_type].categories;
      var data_range = range[1] - range[0];


      switch (type){
        case 'Quantile':
          var values = features.sort(function(a, b) {return a - b});
          var breaks = pv.range(n).map(function(i) { return values[Math.floor(i * (values.length - 1) / n)]});
          breaks[n] = range[1];
          break;
        case 'Equal Interval':
          var breaks = pv.range(n).map(function(i) {return (range[0] + i * data_range / n)});
          breaks[n] = range[1] + data_range / 1000;
          break;
        case 'St Dev':
          var breaks = pv.range(n).map(function(i) {return (mean - stdev * (n / 2 - i)) });
          breaks[n] = range[1] + data_range / 1000;
          break;
        case 'Max Breaks':
          var difArray = [];
          for (var i=0; i< features.length-1; i++){
            dif = features[i + 1] - features[i];
            midPoint = dif / 2 + features[i];
            difArray.push({ 'midPoint': midPoint, 'dif': dif });
          }
          difArray.sort(function(a, b) {return a.dif - b.dif});
          var breaks = pv.range(n-1).map(function(i) {return difArray[i]['midPoint']});
          breaks.sort();
          breaks.unshift(range[0]);
          breaks[n] = range[1] + data_range / 1000;
          break;
      }
      self.breaks = breaks;
    },