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

Integrating images into our art


Lucky for us, we don't need to start from scratch always and we can leave the more complex art for external images. Let's figure out how we can integrate images into our canvas.

Getting ready

We've been in a flag theme in this chapter and getting another flag under our belt sounds real good to me right now. So let's turn our heads to Haiti and get their flag up and running. To create this flag, we need to have the image of the symbol that is placed in the center of the flag.

In the source files, you will find an image of the center graphic (at img/haiti.png). By the way, when integrating art into canvas it's always best to avoid resizing the image whenever possible via code to preserve the image quality.

How to do it...

We will prepare the background to match the flag and then put the entire image above it in the center of the canvas/flag:

  1. Follow the basic steps that we need to access the canvas. Set the width, height, and the actual context:

    var canvas = document...