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

Customizing the look and feel of markers


This will be our last recipe for social mapping. In this recipe, we will revisit our marker itself and give it a facelift. As our marker represents Twitter messages in a clicked area, we will update our marker to look like a Twitter bird (hand made). We will not stop there; after updating our graphic, we will add another graphical layer to shadow our Twitter marker. It will be a shadow, and its opacity will range from zero to full, depending on the number of tweets (a maximum of hundred tweets).

The best way to understand our goal is by checking out the following screenshot:

Note how some tweets have no visible circle outline, while others have a very dark one (that is based on how many tweets are there).

Getting ready

To complete this task you need to first complete all the previous recipes in this chapter.

How to do it...

We will jump right into the JavaScript file and continue from where we left off in the previous recipe.

  1. Update the showTweet function...