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

Creating a pie chart


The steps to create a pie chart are relatively easy and short. Pie charts are ideal for showcasing a closed amount of data that we want to easily compare between data fields such as, in our example, dividing the number of people in the world into groups based on their region:

Getting ready

The first step will be to update our canvas size in the HTML area to be a rectangular area. In our sample, we will update the values to 400 x 400. That's about it; let's start building it.

How to do it...

In the following steps we will create our first pie chart. Let's get started:

  1. Set up our data source and our global variables:

    var data= [	{label:"Asia", value:3518000000,style:"#B1DDF3"},
      {label:"Africa", value:839000000,style:"#FFDE89"},
      {label:"Europe", value:803000000,style:"#E3675C"},
      {label:"Latin America and Caribbean", value: 539000000,style:"#C2D985"},
      {label:"North America", value:320000000,style:"#eeeeee"},
      {label:"Near East", value:179000000,style:"#aaaaaa"},
      {label...