Module: Tsuga::Model::Tile::ClassMethods

Included in:
Tsuga::Model::Tile
Defined in:
lib/tsuga/model/tile.rb

Instance Method Summary collapse

Instance Method Details

#enclosing_viewport(point_ne: nil, point_sw: nil, depth: nil) ⇒ Object

Return an array of Tile instances that encloses both corner points FIXME: this is untested



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# File 'lib/tsuga/model/tile.rb', line 87

def enclosing_viewport(point_ne:nil, point_sw:nil, depth:nil)
  # $stderr.puts "aiming to enclose:"
  # $stderr.puts "%.2f %.2f -> %.2f %.2f" % [point_ne.lat, point_ne.lng, point_sw.lat, point_sw.lng]
  # $stderr.flush

  tiles = []
  first_tile = including(point_sw, depth:depth)

  offset_lat = 0
  loop do
    offset_lng = 0
    loop do 
      # $stderr.puts("offset: #{offset_lat} #{offset_lng}")
      # $stderr.flush
      new_tile = first_tile.neighbour(lat:offset_lat, lng:offset_lng)
      tiles << new_tile

      # $stderr.puts "%.2f %.2f -> %.2f %.2f" % [new_tile.southwest.lat, new_tile.southwest.lng, new_tile.northeast.lat, new_tile.northeast.lng]
      # $stderr.flush

      offset_lng += 1
      break if tiles.last.northeast.lng >= point_ne.lng
    end
    break if tiles.last.northeast.lat >= point_ne.lat
    offset_lat += 1
    offset_lng = 0
  end

  return tiles
end

#including(point, options = {}) ⇒ Object

Returns a Tile instance. point should respond to geohash. Options:

  • :depth

Raises:

  • (ArgumentError) 


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# File 'lib/tsuga/model/tile.rb', line 78

def including(point, options={})
  depth = options[:depth]
  raise ArgumentError, 'bad depth' unless (0..31).include?(depth)

  new(prefix: point.prefix(depth))
end