X-Git-Url: https://projects.mako.cc/source/selectricity-live/blobdiff_plain/1a62f78f4f3818ab697bddf51f80a1ba150ce9e7..131cab23209cb1dfa81930240b8cf722d2302131:/lib/gruff-0.2.8/lib/gruff/accumulator_bar.rb

diff --git a/lib/gruff-0.2.8/lib/gruff/accumulator_bar.rb b/lib/gruff-0.2.8/lib/gruff/accumulator_bar.rb
new file mode 100644
index 0000000..310e193
--- /dev/null
+++ b/lib/gruff-0.2.8/lib/gruff/accumulator_bar.rb
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+require File.dirname(__FILE__) + '/base'
+
+##
+# A special bar graph that shows a single dataset as a set of
+# stacked bars. The bottom bar shows the running total and 
+# the top bar shows the new value being added to the array.
+
+class Gruff::AccumulatorBar < Gruff::StackedBar
+
+  def draw
+    raise(Gruff::IncorrectNumberOfDatasetsException) unless @data.length == 1
+    
+    accumulator_array = []
+    index = 0
+
+    increment_array = @data.first[DATA_VALUES_INDEX].inject([]) {|memo, value| 
+        memo << ((index > 0) ? (value + memo.max) : value)
+        accumulator_array << memo[index] - value
+        index += 1
+        memo
+      }
+    data "Accumulator", accumulator_array
+    
+    super
+  end
+
+end