Class: MapWKT::Geometry::Polygon

Inherits:
MapWKT::Geometry show all
Defined in:
lib/mapwkt/wkt/polygon.rb

Instance Method Summary collapse

Methods inherited from MapWKT::Geometry

parse_linestrings, parse_points, parse_polygons, parse_wkt, parse_x_y

Constructor Details

#initialize(perimeter, *lacunae) ⇒ Polygon

Returns a new MapWKT::Geometry::Polygon with the given outer perimeter and internal lacunae. If the given LineStrings were unclosed, closes them for use in the Polygon, but leaves the original LineStrings unchanged.



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# File 'lib/mapwkt/wkt/polygon.rb', line 12

def initialize (perimeter, *lacunae)
  @perimeter = perimeter.dup.close!
  @lacunae = lacunae.map {|lacuna| lacuna.dup.close! }
end

Instance Method Details

#center ⇒ Object

Returns a Point midway between the N/S- & E/W-most Points in the perimeter.



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# File 'lib/mapwkt/wkt/polygon.rb', line 5

def center
  self.perimeter.center
end

#lacunae ⇒ Object

Returns an array of LineStrings representing the geographical areas treated as lacunae in this Polygon’s enclosed area. Does not return the objects themselves, nor the actual array containing them.



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# File 'lib/mapwkt/wkt/polygon.rb', line 20

def lacunae
  @lacunae.map(&:dup)
end

#perimeter ⇒ Object

Returns a LineString representing the geographical area treated as the outer perimeter of this Polygon’s enclosed area. Does not return the actual LineString object used in this Polygon.



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# File 'lib/mapwkt/wkt/polygon.rb', line 27

def perimeter
  @perimeter.dup
end

#to_s ⇒ Object

Returns a string representation of this Polygon. ⭓ indicates the perimeter LineString, while ⬠ indicates a lacuna LineString.



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# File 'lib/mapwkt/wkt/polygon.rb', line 33

def to_s
  "⭓ #{@perimeter.points.join(", ")} ⭓#{@lacunae.map {|lacuna| " | ⬠ #{lacuna.points.join(", ")} ⬠" }.join} "
end

#wkt ⇒ Object

Returns this Polygon’s WKT representation, with latitudes and longitudes rounded to 7 decimal places.



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# File 'lib/mapwkt/wkt/polygon.rb', line 39

def wkt
  "POLYGON((#{[*@perimeter.points, @perimeter.points.first].map {|p| "#{p.longitude_f} #{p.latitude_f}" }.join(", ")})#{@lacunae.map {|lacuna| ", (#{[*lacuna.points, lacuna.points.first].map {|p| "#{p.longitude_f} #{p.latitude_f}" }.join(", ")})" }.join })"
end