# nofxx/georuby

lib/geo_ruby/simple_features/multi_polygon.rb

### Summary

A
20 mins
###### Test Coverage
``````require 'geo_ruby/simple_features/geometry_collection'

module GeoRuby
module SimpleFeatures
# Represents a group of polygons (see Polygon).
class MultiPolygon < GeometryCollection
def initialize(srid = DEFAULT_SRID, _with_z = false, _with_m = false)
super(srid)
end

def binary_geometry_type #:nodoc:
6
end

def points
@points ||= geometries.reduce([]) do |arr, r|
arr.concat(r.rings.map(&:points).flatten)
end
end

# Text representation of a MultiPolygon
def text_representation(allow_z = true, allow_m = true) #:nodoc:
@geometries.map { |polygon| '(' + polygon.text_representation(allow_z, allow_m) + ')' }.join(',')
end

# WKT geometry type
def text_geometry_type #:nodoc:
'MULTIPOLYGON'
end

def to_coordinates
geometries.map(&:to_coordinates)
end

def as_json(_options = {})
{ type: 'MultiPolygon',
coordinates: to_coordinates }
end

# Creates a multi polygon from an array of polygons
def self.from_polygons(polygons, srid = DEFAULT_SRID, with_z = false, with_m = false)
multi_polygon = new(srid, with_z, with_m)
multi_polygon.concat(polygons)
multi_polygon
end

# Creates a multi polygon from sequences of points : ((((x,y)...(x,y)),((x,y)...(x,y)),((x,y)...(x,y)))
def self.from_coordinates(point_sequence_sequences, srid = DEFAULT_SRID, with_z = false, with_m = false)
multi_polygon = new(srid, with_z, with_m)
multi_polygon.concat(point_sequence_sequences.collect { |point_sequences| Polygon.from_coordinates(point_sequences, srid, with_z, with_m) })
multi_polygon
end
end
end
end``````