class Prawn::Table::Cell

def draw_borders(pt)


cell content.
setting appropriate padding to ensure the border does not overlap with
the cell outside of any padding, so the caller is responsible for
Draws borders around the cell. Borders are centered on the bounds of 
def draw_borders(pt)
  x, y = pt
  @pdf.mask(:line_width, :stroke_color) do
    @borders.each do |border|
      idx = {:top => 0, :right => 1, :bottom => 2, :left => 3}[border]
      border_color = @border_colors[idx]
      border_width = @border_widths[idx]
      border_line  = @border_lines[idx]
      next if border_width <= 0
      # Left and right borders are drawn one-half border beyond the center
      # of the corner, so that the corners end up square.
      from, to = case border
                 when :top
                   [[x, y], [x+width, y]]
                 when :bottom
                   [[x, y-height], [x+width, y-height]]
                 when :left
                   [[x, y + (border_top_width / 2.0)],
                    [x, y - height - (border_bottom_width / 2.0)]]
                 when :right
                   [[x+width, y + (border_top_width / 2.0)],
                    [x+width, y - height - (border_bottom_width / 2.0)]]
                 end
      case border_line
      when :dashed
        @pdf.dash border_width * 4
      when :dotted
        @pdf.dash border_width, :space => border_width * 2
      when :solid
        # normal line style
      else
        raise ArgumentError, "border_line must be :solid, :dotted or" +
          " :dashed"
      end
      @pdf.line_width   = border_width
      @pdf.stroke_color = border_color
      @pdf.stroke_line(from, to)
      @pdf.undash
    end
  end
end