require 'gruff/base'

class Gruff::Bar < Gruff::Base

    def draw
      super

      # Setup spacing.
      #
      # Columns sit side-by-side.
      spacing_factor = 0.9
      @bar_width = @graph_width / (@column_count * @data.length).to_f
    
      @d = @d.stroke_opacity 0.0
    
      @norm_data.each_with_index do |data_row, row_index|
        @d = @d.fill current_color
      
        data_row[1].each_with_index do |data_point, point_index|
          # Use incremented x and scaled y
          left_x = @graph_left + (@bar_width * (row_index + point_index + ((@data.length - 1) * point_index)))
          left_y = @graph_top + (@graph_height - data_point * @graph_height) + 1
          right_x = left_x + @bar_width * spacing_factor
          right_y = @graph_top + @graph_height - 1
          
          @d = @d.rectangle(left_x, left_y, right_x, right_y)
          
          # Calculate center based on bar_width and current row
          label_center = @graph_left + (@data.length * @bar_width * point_index) + (@data.length * @bar_width / 2.0)
          draw_label(label_center, point_index)
        end

        increment_color()
      end
    
      @d.draw(@base_image)    
    end

end