Method: GeoTools::FormHelpers#latitude_field

Defined in:
lib/geo_tools/form_helpers.rb

#latitude_field(method, options = {}) ⇒ Object

Options:

:latitude
  :degrees
    :symbol
  :minutes
    :symbol
  :decimal_minutes
    :symbol
    :maxlength

Assumes the latitude field is called ‘latitude’.

The ‘method’ argument is for consistency with other field helpers. We don’t use it when using the normal Rails form builder.

1/100th of a minute of latitude (or equitorial longitude) is approximately 20m.



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# File 'lib/geo_tools/form_helpers.rb', line 21

def latitude_field(method, options = {})
  opts = {
    :degrees         => { :symbol => '°' },
    :minutes         => { :symbol => '.'     },
    :decimal_minutes => { :symbol => '′', :maxlength => 2 },
  }
  lat_options = options.delete :latitude
  opts.merge! lat_options if lat_options
  
  output = []

  # Degrees
  width = 2
  output << text_field("latitude_degrees",
                       options.merge(:maxlength => width,
                                     :value     => "%0#{width}d" % (@object.send("latitude_degrees") || 0)))
  output << opts[:degrees][:symbol]

  # Minutes
  width = 2
  output << text_field("latitude_minutes",
                       options.merge(:maxlength => width,
                                     :value     => "%0#{width}d" % (@object.send("latitude_minutes") || 0)))
  output << opts[:minutes][:symbol]

  # Decimal minutes
  width = opts[:decimal_minutes][:maxlength]
  output << text_field("latitude_decimal_minutes",
                       options.merge(:maxlength => width,
                                     :value     => @object.send("latitude_decimal_minutes_as_string").ljust(width, '0')))
  output << opts[:decimal_minutes][:symbol]

  # Hemisphere.
  # Hmm, we pass the options in the html_options position.
  output << select("latitude_hemisphere", %w( N S ), {}, options)

  output.join "\n"
end