HTML5 Graphing and Data Visualization Cookbook

HTML5 Graphing and Data Visualization Cookbook

By : Ben Fhala

Buy this Book

HTML5 Graphing and Data Visualization Cookbook

By: Ben Fhala

Buy this Book

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.

HTML5 Graphing and Data Visualization Cookbook

Credits

About the Author

About the Reviewer

www.PacktPub.com

Preface

Free Chapter

Drawing Shapes in Canvas

Introduction

Graphics with 2D canvas

Starting from basic shapes

Layering rectangles to create the flag of Greece

Creating shapes using paths

Creating complex shapes

Adding more vertices

Overlapping shapes to create other shapes

Advanced Drawing in Canvas

Introduction

Drawing arcs

Drawing curves with a control point

Creating a Bezier curve

Integrating images into our art

Drawing with text

Understanding pixel manipulation

Creating Cartesian-based Graphs

Introduction

Building a bar chart from scratch

Spreading data in a scatter chart

Building line charts

Creating the flying brick chart (waterfall chart)

Building a candlestick chart (stock chart)

Let's Curve Things Up

Introduction

Building a bubble chart

Creating a pie chart

Using a doughnut chart to show relationships

Leveraging a radar

Structuring a tree chart

Getting Out of the Box

Introduction

Going through a funnel (a pyramid chart)

Revisiting lines: making the line chart interactive

Tree mapping and recursiveness

Adding user interaction into tree mapping

Making an interactive click meter

Bringing Static Things to Life

Introduction

Stacking graphical layers

Moving to an OOP perspective

Animating independent layers

Adding an interactive legend

Creating a context-aware legend

Depending on the Open Source Sphere

Introduction

Animating a gauge meter (jqPlot)

Creating an animated 3D chart (canvas3DGraph)

Charting over time (flotJS)

Building a clock with RaphaelJS

Making a sunburst chart with InfoVis

Playing with Google Charts

Introduction

Getting started with a pie chart

Creating charts using the ChartWrapper

Changing data source to Google Spreadsheet

Customizing the chart properties with an options object

Adding a dashboard to charts

Using Google Maps

Introduction

Creating a geographic chart with Google Visualization API

Obtaining a Google API key

Building a Google map

Adding markers and events

Customizing controls and overlapping maps

Redesigning maps using styles

Maps in Action

Introduction

Connecting a Twitter feed to a Google map

Building an advanced interactive marker

Adding multiple tweets into an InfoWindow bubble

Customizing the look and feel of markers

Final project: building a live itinerary

Index

Customer Reviews

5 star

4 star

3 star

2 star

1 star

Creating a context-aware legend

Our goal will be to create a legend that updates based on what is under the user's mouse cursor as they roll over our application. Based on the mouse position of the user, we will update our legend to reflect the information that is under the user's mouse.

Getting ready

Grab the latest files from the previous recipe: 06.04.legend.html and 06.04.legend.js.

How to do it...

We aren't going to change anything in the HTML files so let's jump right into the JavaScript and build out our dynamic legend:

From the ChartLine constructor, remove rollover/rollout events as we want to keep our legend always visible:

  this.drawChart();

  this.createLegend();
  this.mainDiv.onmousemove = this.bind(this,this.onMouseMoveArea);
  this.mainDiv.onmouseover = this.bind(this,this.fadeInLegend);
  this.mainDiv.onmouseout = this.bind(this,this.fadeOutLegend);

Update the createLegend method:

LineChart.prototype.createLegend = function (){
  var	can = document.createElement("canvas");
 ...

HTML5 Graphing and Data Visualization Cookbook

By : Ben Fhala

HTML5 Graphing and Data Visualization Cookbook

By: Ben Fhala

Overview of this book

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Current Title:

HTML5 Graphing and Data Visualization Cookbook

Creating a context-aware legend

Getting ready

How to do it...