terraformer-ruby

terraformer-ruby is a mostly faithful port of terraformer.

Installation

In your application's Gemfile:

gem 'terraformer'

Or install it manually:

$ gem install terraformer

Usage

require 'terraformer'

Create a Terraformer primitive from GeoJSON

polygon = Terraformer.parse '{
  "type": "Polygon",
  "coordinates": [
    [
      [-122.66589403152467, 45.52290150862236],
      [-122.66926288604736, 45.52291654238294],
      [-122.67115116119385, 45.518406234030586],
      [-122.67325401306151, 45.514000817199715],
      [-122.6684260368347, 45.5127377671934],
      [-122.66765356063841, 45.51694782364431],
      [-122.66589403152467, 45.52290150862236 ]
    ]
  ]
}'

point = Terraformer.parse '{
  "type": "Point",
  "coordinates": [-122.66947746276854, 45.51775972687403]
}'

Now that you have a point and a polygon primitive you can use the primitive helper methods.

# add a new vertex to our polygon
new_point = Terraformer::Point.new -122.6708507537842, 45.513188859735436
polygon.insert_vertex 2, new_point

You can also have Terraformer perform many geometric operations like convex hulls and bounding boxes.

# returns convex hull
convex_hull = polygon.convex_hull

point.within? convex_hull
=> true

# returns the bounding box
bounding_box = polygon.bbox

Contributing

After checking out the source, run the tests:

$ git clone git@github.com:kenichi/terraformer-ruby.git
$ cd terraformer-ruby
$ bundle install
$ bundle exec rake test

You can also generate RDoc:

$ bundle exec rdoc --main README.md