draw (Gruff::Spider)

    # File lib/gruff/spider.rb, line 29
      def draw
        @hide_line_markers = true

        super

        return unless @has_data

        # Setup basic positioning
        diameter = @graph_height
        radius = @graph_height / 2.0
        top_x = @graph_left + (@graph_width - diameter) / 2.0
        center_x = @graph_left + (@graph_width / 2.0)
        center_y = @graph_top + (@graph_height / 2.0) - 25 # Move graph up a bit

        @unit_length = radius / @max_value

        total_sum = sums_for_spider
        prev_degrees = 0.0
        additive_angle = (2 * Math::PI)/ @data.size

        current_angle = 0.0

        # Draw axes
        draw_axes(center_x, center_y, radius, additive_angle) unless hide_axes

        # Draw polygon
        draw_polygon(center_x, center_y, additive_angle)

        @d.draw(@base_image)
      end