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Learning D3.js 5 Mapping - Second Edition

You're reading from  Learning D3.js 5 Mapping - Second Edition

Product type Book
Published in Nov 2017
Publisher
ISBN-13 9781787280175
Pages 298 pages
Edition 2nd Edition
Languages
Authors (3):
Thomas Newton Thomas Newton
Profile icon Thomas Newton
Oscar Villarreal Oscar Villarreal
Profile icon Oscar Villarreal
Lars Verspohl Lars Verspohl
Profile icon Lars Verspohl
View More author details

Table of Contents (13) Chapters

Preface 1. Gathering Your Cartography Toolbox 2. Creating Images from Simple Text 3. Producing Graphics from Data - the Foundations of D3 4. Creating a Map 5. Click-Click Boom! Applying Interactivity to Your Map 6. Finding and Working with Geographic Data 7. Testing 8. Drawing with Canvas and D3 9. Mapping with Canvas and D3 10. Adding Interactivity to Your Canvas Map 11. Shaping Maps with Data - Hexbin Maps 12. Publishing Your Visualization with GitHub Pages

Finding the Canvas object under the mouse - Picking

We’ve done zooming and rotating. Let’s celebrate by adding another key piece of interactivity: the mouseover. In fact, we don’t want just any mouseover. We want to mouse over an object drawn on the Canvas and retrieve information from that object. Once we have that, we have a lot—we can create tooltips, we can highlight the object, we can link views with another graph showing the same data point, and so on.

Picking, the theory

So, how are we doing this? As established many times above, we can’t just add a listener to a set of pixels, because an event is an object maintained by the browser, interacting with DOM nodes. However, our browser...

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