# File lib/gruff/stacked_bar.rb, line 9
 9:     def draw
10:       get_maximum_by_stack
11:       super
12:       return unless @has_data
13: 
14:       # Setup spacing.
15:       #
16:       # Columns sit stacked.
17:       spacing_factor = 0.9
18:       @bar_width = @graph_width / @column_count.to_f
19:     
20:       @d = @d.stroke_opacity 0.0
21:       
22:       height = Array.new(@column_count, 0)
23:     
24:       @norm_data.each_with_index do |data_row, row_index|
25:         @d = @d.fill data_row[DATA_COLOR_INDEX]
26:       
27:         data_row[1].each_with_index do |data_point, point_index|
28:           # Calculate center based on bar_width and current row
29:           label_center = @graph_left + (@bar_width * point_index) + (@bar_width * spacing_factor / 2.0)
30:           draw_label(label_center, point_index)
31: 
32:           next if (data_point == 0)
33:           # Use incremented x and scaled y
34:           left_x = @graph_left + (@bar_width * point_index)
35:           left_y = @graph_top + (@graph_height -
36:                                  data_point * @graph_height - 
37:                                  height[point_index]) + 1
38:           right_x = left_x + @bar_width * spacing_factor
39:           right_y = @graph_top + @graph_height - height[point_index] - 1
40:           
41:           # update the total height of the current stacked bar
42:           height[point_index] += (data_point * @graph_height ) 
43:           
44:           @d = @d.rectangle(left_x, left_y, right_x, right_y)
45:           
46:         end
47: 
48:       end
49:     
50:       @d.draw(@base_image)    
51:     end