gistfile1.txt

      def initialize( points, rafter_spacing, region )

        self.points = points
        ensure_points_are_geo_ruby_points
        ensure_at_least_3_points

        self.region           = region
        self.rafter_spacing   = rafter_spacing
        
        self.polygon = Polygon.from_points( [self.points] )
        
        mix_in_region(region)
        
        generate_rafters
        set_margins
      end