Class: RCAP::Base::Polygon

Inherits:
Object
  • Object
show all
Includes:
Validation
Defined in:
lib/rcap/base/polygon.rb

Constant Summary collapse

XML_ELEMENT_NAME = 
'polygon'
XPATH = 
"cap:#{ XML_ELEMENT_NAME }"
POINTS_KEY = 
'points'

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Validation

#errors, included, #valid?, #validate

Constructor Details

#initialize {|_self| ... } ⇒ Polygon

Returns a new instance of Polygon.

Parameters:

  • attributes (Hash)

Yields:

  • (_self)

Yield Parameters:



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# File 'lib/rcap/base/polygon.rb', line 18

def initialize
  @points =  []
  yield(self) if block_given?
end

Instance Attribute Details

#points ⇒ Array<Point> (readonly)

Returns Collection of RCAP::Base::Point objects.

Returns:



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# File 'lib/rcap/base/polygon.rb', line 7

def points
  @points
end

Class Method Details

.from_h(polygon_hash) ⇒ Polygon

Returns:



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# File 'lib/rcap/base/polygon.rb', line 114

def self.from_h(polygon_hash)
  new do |polygon|
    Array(polygon_hash[POINTS_KEY]).each do |point_array|
      polygon.add_point do |point|
        point.lattitude = point_array[Point::LATTITUDE_INDEX].to_f
        point.longitude = point_array[Point::LONGITUDE_INDEX].to_f
      end
    end
  end
end

.from_xml_element(polygon_xml_element) ⇒ Polygon

Returns:



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# File 'lib/rcap/base/polygon.rb', line 56

def self.from_xml_element(polygon_xml_element)
  if !polygon_xml_element.text.nil? && !polygon_xml_element.text.empty?
    coordinates = parse_polygon_string(polygon_xml_element.text)
    new do |polygon|
      coordinates.each do |lattitude, longitude|
        polygon.add_point do |point|
          point.lattitude = lattitude.to_f
          point.longitude = longitude.to_f
        end
      end
    end
  else
    new
  end
end

.from_yaml_data(polygon_yaml_data) ⇒ Polygon

Returns:



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# File 'lib/rcap/base/polygon.rb', line 90

def self.from_yaml_data(polygon_yaml_data)
  new do |polygon|
    Array(polygon_yaml_data).each do |lattitude, longitude|
      polygon.add_point do |point|
        point.lattitude = lattitude.to_f
        point.longitude = longitude.to_f
      end
    end
  end
end

.parse_polygon_string(polygon_string) ⇒ Array<Array(Numeric,Numeric)>

Returns:



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# File 'lib/rcap/base/polygon.rb', line 85

def self.parse_polygon_string(polygon_string)
  polygon_string.split(' ').map { |coordinate_string| coordinate_string.split(',').map { |coordinate| coordinate.to_f } }
end

Instance Method Details

#==(other) ⇒ true, false

Two polygons are equivalent if their collection of points is equivalent.

Returns:

  • (true, false) 


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# File 'lib/rcap/base/polygon.rb', line 80

def ==(other)
  @points == other.points
end

#add_point {|point| ... } ⇒ Object

Yields:

  • (point) 


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# File 'lib/rcap/base/polygon.rb', line 23

def add_point
  point = point_class.new
  yield(point) if block_given?
  points << point
  point
end

#inspect ⇒ String

Returns:



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# File 'lib/rcap/base/polygon.rb', line 44

def inspect
  "(#{ @points.map { |point| point.inspect }.join(', ')})"
end

#to_geojson ⇒ Object

Returns GeoJSON representation of the polygon



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# File 'lib/rcap/base/polygon.rb', line 31

def to_geojson
  coordinates = @points.map { |point| [point.longitude, point.lattitude] }
  { 'type' => 'Polygon', 'coordinates' => [coordinates] }.to_json
end

#to_h ⇒ Hash

Returns:

  • (Hash) 


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# File 'lib/rcap/base/polygon.rb', line 126

def to_h
  { POINTS_KEY => @points.map { |point| point.to_a } }
end

#to_s ⇒ Object

Returns a string representation of the polygon of the form

points[0] points[1] points[2] ...

where each point is formatted with Point#to_s



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# File 'lib/rcap/base/polygon.rb', line 39

def to_s
  @points.join(' ')
end

#to_xml ⇒ String

Returns:



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# File 'lib/rcap/base/polygon.rb', line 73

def to_xml
  to_xml_element.to_s
end

#to_xml_element ⇒ REXML::Element

Returns:

  • (REXML::Element) 


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# File 'lib/rcap/base/polygon.rb', line 49

def to_xml_element
  xml_element = REXML::Element.new(XML_ELEMENT_NAME)
  xml_element.add_text(to_s)
  xml_element
end

#to_yaml(options = {}) ⇒ String

Returns:



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# File 'lib/rcap/base/polygon.rb', line 107

def to_yaml(options = {})
  to_yaml_data.to_yaml(options)
end

#to_yaml_data ⇒ Hash

Returns:

  • (Hash) 


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# File 'lib/rcap/base/polygon.rb', line 102

def to_yaml_data
  @points.map { |point| [point.lattitude, point.longitude] }
end