GCMapper

A Ruby gem for easy generation of Great Circle Map images between 2 or more airports. The gem provides an API for constructing the image URLs, the maps themselves are pulled from gcmap.com.

The look and size of the map image can be customized by passing an optional hash of arguments, as explained in the Usage section.

Ruby 1.9.3 or higher | Supports Ruby 2.0!

Add this line to your application's Gemfile:

gem 'gcmapper'

And then execute:

$ bundle

Or install it yourself as:

$ gem install gcmapper

The .gcmap method can be applied to a string (or variable containing a string), representing a valid route between 2 or more airports (ICAO or IATA codes), connected with dashes, like this: EGLL-LOWI or LFST-LSZH-LBSF. Here are some examples:

# An example of normal route:
route = "EGLL-LOWI"
route.gcmap # => Returns an image map URL for the route EGLL-LOWI

# An exampmle of layover route:
another_route = "LFST-LSZH-LBSF"
another_route.gcmap # => Returns an image map URL for the layover route LFST-LSZH-LBSF

# The method can be applied directly to a string:
"EGLL-LOWI".gcmap # => Returns an image map URL for the route EGLL-LOWI

# It's not case sensitive:
"egll-lowi".gcmap # => Returns an image map URL for the route EGLL-LOWI

The resulting image size and look can be customized by passing an optional hash of arguments to the .gcmap method. Customizable attributes include width, height, terrain (toggle satelite terrain overlay), city label and airport name label. Width, height and terrain can be combined in any way or omitted entirely. City label ad Airport name label are mutually exclusive.

• width: 720px
• height: 360px
• terrain: off
• city label: on
• airport name label: off

# Passing width only (default is 720px):
route = "egll-lowi"
route.gcmap(:width => "600") # => Returns an image map URL with width set to 600px

# Passing height only (default is 360px):
route = "egll-lowi"
route.gcmap(:height => 400)  # => Returns an image map URL with height set to 400px

# Passing width and height:
"egll-lowi".gcmap(:width => "800", :height => "400") # => Returns an image map URL with width 800px and height 400px

# Enabling terrain overlay:
route = "egll-lowi"
route.gcmap(:terrain => true) # => Returns an image map URL with terrain overlay enabled

# Setting width, height and enabling terrain overlay:
"egll-lowi".gcmap(:width => 800, :height => 400, :terrain => true) # => Returns an image map URL with set width, height and terrain

# Setting width, height, enabling terrain overlay and disabling the city labels:
"egll-lowi".gcmap(:width => 800, :height=>400, :terrain=>true, :city=>false) # => Returns an image map URL with set width, height and terrain, with city labels disabled

# Setting the map to display the airports' names instead of the ICAO/IATA codes
route = "egll-lowi"
route.gcmap(:airport_name => true) # => Returns an image map URL with airport names displayed

# Setting the map to display the airports' names and a terrain overlay
route = "egll-lowi"
route.gcmap(:airport_name => true, :terrain => true) # => Returns an image map URL with airport names and terrain displayed

Finally, here's an example of how to use the gem in a Rails application:

In your controller:

@route = "egll-lowi"

In your view:

<%= image_tag @route.gcmap(:width => "600") %>

• the route string can be constructed from either ICAO or IATA airport codes; both types are recognized
• the route string is not case sensitive, so for example lgav-lqsa will be recognized as well
• layover routes that chain multiple airports (more than 2) are also supported
• default image parameters are: width 720px, width: 360px, terrain not shown
• when passing the width and height hash options the values can be put in quotes or not, either way works
• city label and airport_name label options are mutually exclusive, i.e. you can either have the ICAO/IATA code with optional city name OR the Airport name

• Ruby 2.0 support

• More test cases
• Typos

• Updated for vatsim_online compatibility

• [Enhancement] Maps now show the user input code (ICAO or IATA) instead of ICAO only
• [Feature] New hash option :city to toggle city labels on or off (see Usage)
• [Feature] New hash option :airport_name to toggle airport name labels on or off (see Usage)

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Added some feature')
4. Make sure all tests pass!
5. Push to the branch (git push origin my-new-feature)
6. Create new Pull Request

Copyright © 2013 Svilen Vassilev

If you find my work useful or time-saving, you can endorse it or buy me a cup of coffee:

Released under the MIT LICENSE

Maps generated by the Great Circle Mapper, copyright Karl L. Swartz