Parent

Geokit::Bounds

Bounds represents a rectangular bounds, defined by the SW and NE corners

Attributes

ne[RW]

sw and ne are LatLng objects

sw[RW]

sw and ne are LatLng objects

Public Class Methods

from_point_and_radius(point,radius,options={}) click to toggle source

returns an instance of bounds which completely encompases the given circle

# File lib/geokit/mappable.rb, line 509
def from_point_and_radius(point,radius,options={})
  point=LatLng.normalize(point)
  p0=point.endpoint(0,radius,options)
  p90=point.endpoint(90,radius,options)
  p180=point.endpoint(180,radius,options)
  p270=point.endpoint(270,radius,options)
  sw=Geokit::LatLng.new(p180.lat,p270.lng)
  ne=Geokit::LatLng.new(p0.lat,p90.lng)
  Geokit::Bounds.new(sw,ne)
end
new(sw,ne) click to toggle source

provide sw and ne to instantiate a new Bounds instance

# File lib/geokit/mappable.rb, line 452
def initialize(sw,ne)
  raise ArgumentError if !(sw.is_a?(Geokit::LatLng) && ne.is_a?(Geokit::LatLng))
  @sw,@ne=sw,ne
end
normalize(thing,other=nil) click to toggle source

Takes two main combinations of arguments to create a bounds: point,point (this is the only one which takes two arguments

point,point

. . . where a point is anything LatLng#normalize can handle (which is quite a lot)

NOTE: everything combination is assumed to pass points in the order sw, ne

# File lib/geokit/mappable.rb, line 526
def normalize (thing,other=nil)   
  # maybe this will be simple -- an actual bounds object is passed, and we can all go home
  return thing if thing.is_a? Bounds
  
  # no? OK, if there's no "other," the thing better be a two-element array        
  thing,other=thing if !other && thing.is_a?(Array) && thing.size==2

  # Now that we're set with a thing and another thing, let LatLng do the heavy lifting.
  # Exceptions may be thrown
  Bounds.new(Geokit::LatLng.normalize(thing),Geokit::LatLng.normalize(other))
end

Public Instance Methods

==(other) click to toggle source

Returns true if the candidate object is logically equal. Logical equivalence is true if the lat and lng attributes are the same for both objects.

# File lib/geokit/mappable.rb, line 492
def ==(other)
  other.is_a?(Bounds) ? self.sw == other.sw && self.ne == other.ne : false
end
center() click to toggle source

returns the a single point which is the center of the rectangular bounds

# File lib/geokit/mappable.rb, line 458
def center
  @sw.midpoint_to(@ne)
end
contains?(point) click to toggle source

Returns true if the bounds contain the passed point. allows for bounds which cross the meridian

# File lib/geokit/mappable.rb, line 474
def contains?(point)
  point=Geokit::LatLng.normalize(point)
  res = point.lat > @sw.lat && point.lat < @ne.lat
  if crosses_meridian?
    res &= point.lng < @ne.lng || point.lng > @sw.lng
  else
    res &= point.lng < @ne.lng && point.lng > @sw.lng
  end
  res
end
crosses_meridian?() click to toggle source

returns true if the bounds crosses the international dateline

# File lib/geokit/mappable.rb, line 486
def crosses_meridian?
  @sw.lng > @ne.lng 
end
to_a() click to toggle source

a two-element array of two-element arrays: sw,ne

# File lib/geokit/mappable.rb, line 468
def to_a
  [@sw.to_a, @ne.to_a]
end
to_s() click to toggle source

a simple string representation:sw,ne

# File lib/geokit/mappable.rb, line 463
def to_s
  "#{@sw.to_s},#{@ne.to_s}"   
end
to_span() click to toggle source

Equivalent to Google Maps API's .toSpan() method on GLatLng's.

Returns a LatLng object, whose coordinates represent the size of a rectangle defined by these bounds.

# File lib/geokit/mappable.rb, line 500
def to_span
  lat_span = (@ne.lat - @sw.lat).abs
  lng_span = (crosses_meridian? ? 360 + @ne.lng - @sw.lng : @ne.lng - @sw.lng).abs
  Geokit::LatLng.new(lat_span, lng_span)
end

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