draw (Gruff::Base)

    # File lib/gruff/base.rb, line 485
        def draw
          make_stacked if @stacked
          setup_drawing

          debug {
            # Outer margin
            @d.rectangle( @left_margin, @top_margin,
            @raw_columns - @right_margin, @raw_rows - @bottom_margin)
            # Graph area box
            @d.rectangle( @graph_left, @graph_top, @graph_right, @graph_bottom)
          }
        end