theme= (Gruff::Base)

    # File lib/gruff/base.rb, line 279
        def theme=(options)
          reset_themes()

          defaults = {
            :colors => ['black', 'white'],
            :additional_line_colors => [],
            :marker_color => 'white',
            :font_color => 'black',
            :background_colors => nil,
            :background_image => nil
          }
          @theme_options = defaults.merge options

          @colors = @theme_options[:colors]
          @marker_color = @theme_options[:marker_color]
          @font_color = @theme_options[:font_color] || @marker_color
          @additional_line_colors = @theme_options[:additional_line_colors]

          render_background
        end