Book Image

Data Visualization with D3 4.x Cookbook - Second Edition

By : Nick Zhu
Book Image

Data Visualization with D3 4.x Cookbook - Second Edition

By: Nick Zhu

Overview of this book

Master D3.js and create amazing visualizations with the Data Visualization with D3 4.x Cookbook. Written by professional data engineer Nick Zhu, this D3.js cookbook features over 65 recipes. ? Solve real-world visualization problems using D3.js practical recipes ? Understand D3 fundamentals ? Includes illustrations, ready-to-go code samples and pre-built chart recipes
Table of Contents (21 chapters)
Data Visualization with D3 4.x Cookbook - Second Edition
Credits
About the Author
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface

Interpolating colors


It is sometimes necessary to interpolate colors when you interpolate values that do not contain numbers but rather RGB or HSL color code. This recipe addresses the question how can you define scales for color codes and perform interpolation on them?

Getting ready

Open your local copy of the following file in your web browser:

https://github.com/NickQiZhu/d3-cookbook-v2/blob/master/src/chapter4/color-interpolation.html .

How to do it...

Color interpolation is such a common operation in visualization that D3 actually provides a number of different kinds of interpolators dedicated to color supporting, for example, RGB, HSL, L*a*b*, HCL, and Cubehelix color space. In this recipe, we will demonstrate how color interpolation can be performed in RGB color space. However, all other color interpolators work in the same way.

Note

D3 color interpolate function always returns the interpolated color in RGB space, no matter what the original color space is, since not all browsers support...