Book Image

Learning D3.js 5 Mapping - Second Edition

By : Thomas Newton, Oscar Villarreal, Lars Verspohl
Book Image

Learning D3.js 5 Mapping - Second Edition

By: Thomas Newton, Oscar Villarreal, Lars Verspohl

Overview of this book

D3.js is a visualization library used for the creation and control of dynamic and interactive graphical forms. It is a library used to manipulate HTML and SVG documents as well as the Canvas element based on data. Using D3.js, developers can create interactive maps for the web, that look and feel beautiful. This book will show you how build and design maps with D3.js and gives you great insight into projections, colors, and the most appropriate types of map. The book begins by helping you set up all the tools necessary to build visualizations and maps. Then it covers obtaining geographic data, modifying it to your specific needs, visualizing it with augmented data using D3.js. It will further show you how to draw and map with the Canvas API and how to publish your visualization. By the end of this book, you'll be creating maps like the election maps and the kind of infographics you'll find on sites like the New York Times.
Table of Contents (13 chapters)
6
Finding and Working with Geographic Data

Project structure

The Bootstrap project contains the following files and directories:

The project works out of the box with example code already in place. To see this in action, we will launch the example. From the example Bootstrap code provided, first, install all the dependencies (note that you only have to execute this command once):

npm install

Then, to see the visualization, execute the following:

node node_modules/http-server/bin/http-server  

Next, open the browser to http://localhost:8080. You should see three bars changing based on random data in a series of tests. Note that if you have the previous examples already open, you will have to kill that process in order to run this one, as both of them use the same port.

To see the unit tests working, just execute the following:

node_modules/karma/bin/karma start  

You should see a summary of five unit tests running in...