Book Image

HTML5 Graphing and Data Visualization Cookbook

By : Ben Fhala
Book Image

HTML5 Graphing and Data Visualization Cookbook

By: Ben Fhala

Overview of this book

The HTML5 canvas tag makes creating any plot shape easy, all you have to do then is fill it with exciting visualizations written in JavaScript or using other visualization tools. "HTML5 Graphing and Data Visualization Cookbook" is the perfect break into the world of Canvas, charts, and graphs in HTML5 and JavaScript. In this book we will go through a journey of getting to know the technology by creating and planning data-driven visualizations. This cookbook is organized in a linear, progressive way so it can be read from start to finish, as well as be used as a resource for specific tasks.This book travels through the steps involved in creating a fully interactive and animated visualization in HTML5 and JavaScript. You will start from very simple "hello world"ù samples and quickly dive deeper into the world of graphs and charts in HTML5. Followed by learning how canvas works and carrying out a group of tasks geared at taking what we learned and implementing it in a variety of chart types. With each chapter the content becomes more complex and our creations become more engaging and interactive.Our goal is that by the end of this book you will have a strong foundation; knowing when to create a chart on your own from scratch and when it would be a good idea to depend on other APIs.We finish our book in our last two chapters exploring Google maps and integrating everything we learnt into a full project.
Table of Contents (17 chapters)
HTML5 Graphing and Data Visualization Cookbook
Credits
About the Author
About the Reviewer
www.PacktPub.com
Preface
Index

Leveraging a radar


Radars are very misunderstood charts but are really amazing. A radar enables us to showcase a really large amount of comparable data in a very condensed way. The radar chart is known as a spider chart as well.

Tip

Warning

You really need to be friendly with the Math.cos and Math.sin functions, as we are going to use them plenty of times in this chart type. With that said, if you don't feel comfortable with them yet, it would be a good idea to start from the start of the chapter to refresh your memory on this.

Getting ready

As always, we are going to start with our base HTML page with an init callback.

Tip

Note

A radar chart is really a line chart wrapped up into a circular shape with a lot of different math involved; but it's the same idea—instead of spreading our data horizontally, we are spreading our data around a center point.

How to do it...

Let's see what are the steps involved in creating a radar chart:

  1. Create/Organize the chart data and the actual data:

    var data=[{label:"Ben...