--- /dev/null
+require File.dirname(__FILE__) + '/base'
+require File.dirname(__FILE__) + '/side_bar'
+
+##
+# New gruff graph type added to enable sideways stacking bar charts
+# (basically looks like a x/y flip of a standard stacking bar chart)
+#
+# alun.eyre@googlemail.com
+
+class Gruff::SideStackedBar < Gruff::SideBar
+
+ def draw
+ @has_left_labels = true
+ get_maximum_by_stack
+ super
+
+ return unless @has_data
+
+ # Setup spacing.
+ #
+ # Columns sit stacked.
+ spacing_factor = 0.9
+
+ @bar_width = @graph_height / @column_count.to_f
+ @d = @d.stroke_opacity 0.0
+ height = Array.new(@column_count, 0)
+ length = Array.new(@column_count, @graph_left)
+
+ @norm_data.each_with_index do |data_row, row_index|
+ @d = @d.fill data_row[DATA_COLOR_INDEX]
+
+ data_row[1].each_with_index do |data_point, point_index|
+
+ ## using the original calcs from the stacked bar chart to get the difference between
+ ## part of the bart chart we wish to stack.
+ temp1 = @graph_left + (@graph_width -
+ data_point * @graph_width -
+ height[point_index]) + 1
+ temp2 = @graph_left + @graph_width - height[point_index] - 1
+ difference = temp2 - temp1
+
+ left_x = length[point_index] #+ 1
+ left_y = @graph_top + (@bar_width * point_index)
+ right_x = left_x + difference
+ right_y = left_y + @bar_width * spacing_factor
+ length[point_index] += difference
+ height[point_index] += (data_point * @graph_width - 2)
+
+ @d = @d.rectangle(left_x, left_y, right_x, right_y)
+
+ # Calculate center based on bar_width and current row
+ label_center = @graph_top + (@bar_width * point_index) + (@bar_width * spacing_factor / 2.0)
+ draw_label(label_center, point_index)
+ end
+
+ end
+
+ @d.draw(@base_image)
+ end
+
+ protected
+
+ def larger_than_max?(data_point, index=0)
+ max(data_point, index) > @maximum_value
+ end
+
+ def max(data_point, index)
+ @data.inject(0) {|sum, item| sum + item[1][index]}
+ end
+
+end