class PDF::Reader::TextReceiver

def calculate_line_and_location (new_loc)
  ##puts "calculate_line_and_location(#{new_loc})"
  key = new_loc; key.freeze
  #key = new_loc.to_s # because hashes with string keys are magic (auto-freeze)
  if @written_to
    unless @displacement.has_key?(key)
      if key < @location
        @displacement[key] = @line + 1
      elsif key < @smallest_y_loc
        @displacement[key] = @line + 1
      else
        key = @displacement.keys.find_all {|i| key > i}.sort.last
        @displacement[key] = 0 unless @displacement.has_key?(key)
      end
    end
  else
    @displacement[key] = 0
  end
  @smallest_y_loc = key if key < @smallest_y_loc
  @location = key
  @line = @displacement[key]
  #puts "calculate_line_and_location: @location=#@location @line=#@line smallest_y_loc=#@smallest_y_loc"
end