d3_maps

D3Maps Ruby Gem

D3Maps Ruby Gem is a gem that simplifies the process of creating maps of the United States and assigning data values to each location.

Installation

Add this line to your application's Gemfile:

gem 'd3_maps'

And then execute:

$ bundle

Or install it yourself as:

$ gem install d3_maps

In app/assets/javascripts/application.js, include

//= require d3_maps

Usage

Create the database needed to store the information for your project. The database consist of a States table with information on number, code, and name. Number must be included. Code and name are optional values to display.

rails generate model States number:integer code:string name:string
rake db:migrate

In the seeds.rb file

require 'csv'
tsv_text = File.read(Rails.root.join('assets', 'tsv', 'us_states', 'us-state-names.tsv'))
tsv = CSV.parse(tsv_text, :headers => true, :col_sep => "\t")
tsv.each do |row|
  s = State.new
  s.number = row['id']
  s.code = row['code']
  s.name = row['name']
  s.save
end

puts "There are now #{State.count} in the states table"

Seed your database.

rake db:seed

Or reset your database

rake db:reset

Host the data as a json file as part of your application

rails generate controller States index

Replace the States/states_controller.rb and states/index.html.erb files with the same files in d3maps.

The map for United states is located in views/welcome/index.html.erb The map for the world is located in views/welcome/about.html.erb

To generate the world map, repeat the process and seed your database with data located at at app/tsv/world/world-countries-names.tsv