Add Rubella::Weighting::PerCount

The Rubella::Weighting::PerCount create a field of each given value.
The weighting is based on the maximum value.
So you are able to create i.e. commit per day maps.

lib/rubella/weighting/per_count.rb

@@ -0,0 +1,61 @@
+require "rubella/weighting/base"
+
+module Rubella
+  module Weighting
+
+    # The Rubella::Weighting::PerCount create a field of each given value.
+    # The weighting is based on the maximum value.
+    #
+    class PerCount < Base
+
+      # Constructor
+      # Creates a new Rubella::Weighting::PerCount object.
+      #
+      # @param buckets int
+      # @return Rubella::Weighting::Base
+      # @raise ArgumentError
+      #
+      def initialize buckets = 7
+        super buckets
+      end
+
+      # Sets the buckets
+      #
+      # @param buckets int The amount of buckets
+      # @raise ArgumentError
+      #
+      def buckets= buckets
+        @buckets = buckets
+      end
+
+      # Creates a output readable list.
+      # This list is Array within a subarrays, which contain the buckets for
+      # every time value unit.
+      #
+      # @param input Rubella::Input An input object
+      # @return Rubella::Storage
+      def parse input
+        # prepare data
+        data_list = Array.new()
+
+        # Get the maximum of commits
+        max = input.sort.pop
+
+        i = 0
+        input.each do |commits|
+          data_list << Array.new() if i == 0
+          data_list.last << commits.to_f/max
+          if i == (buckets-1)
+            i = 0
+          else
+            i = i + 1
+          end
+        end
+
+        Rubella::Storage.new data_list
+      end
+      
+    end
+
+  end
+end