Class: GeoRuby::SimpleFeatures::GeometryCollection

Inherits:
Geometry
  • Object
show all
Defined in:
lib/geo_ruby/simple_features/geometry_collection.rb

Overview

Represents a collection of arbitrary geometries

Direct Known Subclasses

MultiLineString, MultiPoint, MultiPolygon

Instance Attribute Summary collapse

Attributes inherited from Geometry

#srid, #with_m, #with_z

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Geometry

#as_ewkb, #as_ewkt, #as_georss, #as_hex_ewkb, #as_hex_wkb, #as_kml, #as_wkb, #as_wkt, #envelope, from_ewkb, from_ewkt, from_geojson, from_georss, from_georss_with_tags, from_hex_ewkb, from_kml

Constructor Details

#initialize(srid = DEFAULT_SRID, with_z = false, with_m = false) ⇒ GeometryCollection

Returns a new instance of GeometryCollection.



9
10
11
12
 
# File 'lib/geo_ruby/simple_features/geometry_collection.rb', line 9

def initialize(srid = DEFAULT_SRID,with_z=false,with_m=false)
  super(srid,with_z,with_m)
  @geometries = []
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method_name, *args, &b) ⇒ Object

Delegate the unknown methods to the geometries array



15
16
17
 
# File 'lib/geo_ruby/simple_features/geometry_collection.rb', line 15

def method_missing(method_name,*args,&b)
  @geometries.send(method_name,*args,&b)
end

Instance Attribute Details

#geometries ⇒ Object (readonly)

Returns the value of attribute geometries.



7
8
9
 
# File 'lib/geo_ruby/simple_features/geometry_collection.rb', line 7

def geometries
  @geometries
end

Class Method Details

.from_geometries(geometries, srid = DEFAULT_SRID, with_z = false, with_m = false) ⇒ Object

creates a new GeometryCollection from an array of geometries



141
142
143
144
145
 
# File 'lib/geo_ruby/simple_features/geometry_collection.rb', line 141

def self.from_geometries(geometries,srid=DEFAULT_SRID,with_z=false,with_m=false)
  geometry_collection = new(srid,with_z,with_m)
  geometry_collection.concat(geometries)
  geometry_collection
end

Instance Method Details

#==(other_collection) ⇒ Object

tests the equality of geometry collections



67
68
69
70
71
72
73
74
75
76
77
78
79
80
 
# File 'lib/geo_ruby/simple_features/geometry_collection.rb', line 67

def ==(other_collection)
  if(other_collection.class != self.class)
    false
  elsif length != other_collection.length
    false
  else
    index=0
    while index<length
      return false if self[index] != other_collection[index]
      index+=1
    end
    true
  end
end

#as_json(options = {}) ⇒ Object 



105
106
107
108
 
# File 'lib/geo_ruby/simple_features/geometry_collection.rb', line 105

def as_json(options = {})
  {:type => 'GeometryCollection',
   :geometries => self.geometries}
end

#binary_geometry_type ⇒ Object

WKB geometry type of the collection



91
92
93
 
# File 'lib/geo_ruby/simple_features/geometry_collection.rb', line 91

def binary_geometry_type #:nodoc:
  7
end

#binary_representation(allow_z = true, allow_m = true) ⇒ Object

Binary representation of the collection



83
84
85
86
87
88
 
# File 'lib/geo_ruby/simple_features/geometry_collection.rb', line 83

def binary_representation(allow_z=true,allow_m=true) #:nodoc:
  rep = [length].pack("V")
  #output the list of geometries without outputting the SRID first and with the same setting regarding Z and M
  each {|geometry| rep << geometry.as_ewkb(false,allow_z,allow_m) }
  rep
end

#bounding_box ⇒ Object

Bounding box in 2D/3D. Returns an array of 2 points



20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
 
# File 'lib/geo_ruby/simple_features/geometry_collection.rb', line 20

def bounding_box
  max_x, min_x, max_y, min_y = -Float::MAX, Float::MAX, -Float::MAX, Float::MAX
  if with_z
    max_z, min_z = -Float::MAX, Float::MAX
    each do |geometry|
      bbox = geometry.bounding_box
      sw = bbox[0]
      ne = bbox[1]

      max_y = ne.y if ne.y > max_y
      min_y = sw.y if sw.y < min_y
      max_x = ne.x if ne.x > max_x
      min_x = sw.x if sw.x < min_x
      max_z = ne.z if ne.z > max_z
      min_z = sw.z if sw.z < min_z
    end
    [Point.from_x_y_z(min_x,min_y,min_z),Point.from_x_y_z(max_x,max_y,max_z)]
  else
    each do |geometry|
      bbox = geometry.bounding_box
      sw = bbox[0]
      ne = bbox[1]

      max_y = ne.y if ne.y > max_y
      min_y = sw.y if sw.y < min_y
      max_x = ne.x if ne.x > max_x
      min_x = sw.x if sw.x < min_x
    end
    [Point.from_x_y(min_x,min_y),Point.from_x_y(max_x,max_y)]
  end
end

#georss_gml_representation(options) ⇒ Object

georss gml representation : outputs only the first geometry of the collection



126
127
128
 
# File 'lib/geo_ruby/simple_features/geometry_collection.rb', line 126

def georss_gml_representation(options)#:nodoc:
  self[0].georss_gml_representation(options)
end

#georss_simple_representation(options) ⇒ Object

georss simple representation : outputs only the first geometry of the collection



118
119
120
 
# File 'lib/geo_ruby/simple_features/geometry_collection.rb', line 118

def georss_simple_representation(options)#:nodoc:
  self[0].georss_simple_representation(options)
end

#georss_w3cgeo_representation(options) ⇒ Object

georss w3c representation : outputs the first point of the outer ring



122
123
124
 
# File 'lib/geo_ruby/simple_features/geometry_collection.rb', line 122

def georss_w3cgeo_representation(options)#:nodoc:
  self[0].georss_w3cgeo_representation(options)
end

#kml_representation(options = {}) ⇒ Object

outputs the geometry in kml format



131
132
133
134
135
136
137
138
 
# File 'lib/geo_ruby/simple_features/geometry_collection.rb', line 131

def kml_representation(options = {}) #:nodoc:
  result = "<MultiGeometry#{options[:id_attr]}>\n"
  options[:id_attr] = "" #the subgeometries do not have an ID
  each do |geometry|
    result += geometry.kml_representation(options)
  end
  result += "</MultiGeometry>\n"
end

#m_range ⇒ Object 



52
53
54
55
56
57
58
59
60
61
62
63
64
 
# File 'lib/geo_ruby/simple_features/geometry_collection.rb', line 52

def m_range
  if with_m
    max_m, min_m = -Float::MAX, Float::MAX
    each do |lr|
      lrmr = lr.m_range
      max_m = lrmr[1] if lrmr[1] > max_m
      min_m = lrmr[0] if lrmr[0] < min_m
    end
    [min_m,max_m]
  else
    [0,0]
  end
end

#text_geometry_type ⇒ Object

WKT geometry type



101
102
103
 
# File 'lib/geo_ruby/simple_features/geometry_collection.rb', line 101

def text_geometry_type #:nodoc:
  "GEOMETRYCOLLECTION"
end

#text_representation(allow_z = true, allow_m = true) ⇒ Object

Text representation of a geometry collection



96
97
98
 
# File 'lib/geo_ruby/simple_features/geometry_collection.rb', line 96

def text_representation(allow_z=true,allow_m=true) #:nodoc:
  @geometries.collect{|geometry| geometry.as_ewkt(false,allow_z,allow_m)}.join(",")
end

#to_json(options = {}) ⇒ Object Also known as: as_geojson

simple geojson representation TODO add CRS / SRID support?



112
113
114
 
# File 'lib/geo_ruby/simple_features/geometry_collection.rb', line 112

def to_json(options = {})
  as_json(options).to_json(options)
end