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

Click-Click Boom! Applying Interactivity to Your Map

In the previous chapter, you learned what is needed to build a basic map with D3.js. We also discussed the concepts of enter, update, and exit and how they apply to maps. You should also understand how D3 mixes and matches HTML with data. However, let's say you want to take it a step further and add more interactivity to your map. We covered only the tip of the iceberg regarding click events in the previous chapter. Now, it's time to dig deeper.

In this chapter, we will expand our knowledge of events and event types. We will progress by experimenting and building upon what you've learned. The following topics are covered in this chapter:

  • Events and how they occur
  • Experiment 1 - hover events and tooltips
  • Experiment 2 - tooltips with visualizations
  • Experiment 3 - panning and zooming
  • Experiment 4 - orthographic...