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Steve Fulton and Jeff Fulton
SECOND EDITION
HTML5 Canvas
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HTML5 Canvas, Second Edition
by Steve Fulton and Jeff Fulton
Copyright © 2013 8bitrocket Studios. All rights reserved.
Printed in the United States of America.
Published by O’Reilly Media, Inc., 1005 Gravenstein Highway North, Sebastopol, CA 95472.
O’Reilly books may be purchased for educational, business, or sales promotional use. Online editions are
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institutional sales department: 800-998-9938 or corporate@oreilly.com.
Editors: Simon St. Laurent and Meghan Blanchette
Production Editor: Kara Ebrahim
Copyeditor: nSight, Inc.
Proofreader: nSight, Inc.
Indexer: Lucie Haskins
Cover Designer: Randy Comer
Interior Designer: David Futato
Illustrator: Rebecca Demarest
April 2013:
Second Edition
Revision History for the Second Edition:
2013-04-10:  First release
See http://oreilly.com/catalog/errata.csp?isbn=9781449334987 for release details.
Nutshell Handbook, the Nutshell Handbook logo, and the O’Reilly logo are registered trademarks of O’Reilly
Media, Inc. HTML5 Canvas, Second Edition, the image of a New Zealand kaka, and related trade dress are
trademarks of O’Reilly Media, Inc.
Many of the designations used by manufacturers and sellers to distinguish their products are claimed as
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While every precaution has been taken in the preparation of this book, the publisher and authors assume
no responsibility for errors or omissions, or for damages resulting from the use of the information contained
herein.
ISBN: 978-1-449-33498-7
[LSI]
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Table of Contents
Preface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  xv
1. Introduction to HTML5 Canvas. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  1
What Is HTML5?                                                                                                               2
The Basic HTML5 Page                                                                                                     3
<!doctype html>                                                                                                             3
<html lang=“en”>                                                                                                           4
<meta charset=“UTF-8”>                                                                                              4
<title>...</title>                                                                                                               4
A Simple HTML5 Page                                                                                                  4
Basic HTML We Will Use in This Book                                                                         5
<div>                                                                                                                                5
<canvas>                                                                                                                          7
The Document Object Model (DOM) and Canvas                                                      7
JavaScript and Canvas                                                                                                       7
Where Does JavaScript Go and Why?                                                                         7
HTML5 Canvas “Hello World!”                                                                                       8
Encapsulating Your JavaScript Code for Canvas                                                        9
Adding Canvas to the HTML Page                                                                            10
Using the document Object to Reference the Canvas Element in JavaScript      11
Testing to See Whether the Browser Supports Canvas                                           11
Retrieving the 2D Context                                                                                          12
The drawScreen() Function                                                                                        12
Debugging with console.log                                                                                           16
The 2D Context and the Current State                                                                         17
The HTML5 Canvas Object                                                                                           18
Another Example: Guess The Letter                                                                             19
How the Game Works                                                                                                  19
The “Guess The Letter” Game Variables                                                                   20
v
The initGame() Function                                                                                            21
The eventKeyPressed() Function                                                                               21
The drawScreen() Function                                                                                        23
Exporting Canvas to an Image                                                                                   24
The Final Game Code                                                                                                  25
Hello World Animated Edition                                                                                      25
Some Necessary Properties                                                                                         26
Animation Loop                                                                                                           27
Alpha Transparency with the globalAlpha Property                                               28
Clearing and Displaying the Background                                                                 28
Updating the globalAlpha Property for Text Display                                              29
Drawing the Text                                                                                                          29
HTML5 Canvas and Accessibility: Sub Dom                                                               31
Hit Testing Proposal                                                                                                    32
What’s Next?                                                                                                                     33
2. Drawing on the Canvas. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  35
The Basic File Setup for This Chapter                                                                          35
The Basic Rectangle Shape                                                                                              36
The Canvas State                                                                                                              37
What’s Not Part of the State?                                                                                       38
How Do We Save and Restore the Canvas State?                                                     38
Using Paths to Create Lines                                                                                            38
Starting and Ending a Path                                                                                         39
The Actual Drawing                                                                                                     39
Examples of More Advanced Line Drawing                                                             40
Advanced Path Methods                                                                                                 42
Arcs                                                                                                                                 42
Bezier Curves                                                                                                                44
The Canvas Clipping Region                                                                                      45
Compositing on the Canvas                                                                                           47
Simple Canvas Transformations                                                                                    50
Rotation and Translation Transformations                                                              50
Scale Transformations                                                                                                 56
Combining Scale and Rotation Transformations                                                    57
Filling Objects with Colors and Gradients                                                                   60
Setting Basic Fill Colors                                                                                               60
Filling Shapes with Gradients                                                                                     61
Filling Shapes with Patterns                                                                                            71
Creating Shadows on Canvas Shapes                                                                            75
Methods to Clear the Canvas                                                                                         77
Simple Fill                                                                                                                      77
vi  |  Table of Contents
Resetting the Canvas Width and Height                                                                   77
Resetting the Canvas clearRect Function                                                                  77
Checking to See Whether a Point Is in the Current Path                                           79
Drawing a Focus Ring                                                                                                     80
What’s Next?                                                                                                                     80
3. The HTML5 Canvas Text API. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   81
Canvas Text and CSS                                                                                                       81
Displaying Basic Text                                                                                                       82
Basic Text Display                                                                                                         82
Handling Basic Text in Text Arranger                                                                       82
Communicating Between HTML Forms and the Canvas                                      83
Using measureText                                                                                                       84
fillText and strokeText                                                                                                 85
Setting the Text Font                                                                                                        89
Font Size, Face, Weight, and Style Basics                                                                  89
Handling Font Size and Face in Text Arranger                                                        89
Font Color                                                                                                                     94
Font Baseline and Alignment                                                                                     96
Text Arranger Version 2.0                                                                                         101
Text and the Canvas Context                                                                                       101
Global Alpha and Text                                                                                               101
Global Shadows and Text                                                                                          103
Text with Gradients and Patterns                                                                                106
Linear Gradients and Text                                                                                        107
Radial Gradients and Text                                                                                         109
Image Patterns and Text                                                                                            109
Handling Gradients and Patterns in Text Arranger                                              110
Width, Height, Scale, and toDataURL() Revisited                                                    114
Dynamically Resizing the Canvas                                                                            114
Dynamically Scaling the Canvas                                                                              116
The toDataURL() Method of the Canvas Object                                                   117
Final Version of Text Arranger                                                                                    119
Animated Gradients                                                                                                      128
The Future of Text on the Canvas                                                                               132
CSS Text                                                                                                                       133
Making Text Accessible                                                                                             133
What’s Next?                                                                                                                   133
4. Images on the Canvas. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  135
The Basic File Setup for This Chapter                                                                        135
Image Basics                                                                                                                   136
Table of Contents  |  vii
Preloading Images                                                                                                      137
Displaying an Image on the Canvas with drawImage()                                       137
Resizing an Image Painted to the Canvas                                                               139
Copying Part of an Image to the Canvas                                                                140
Simple Cell-Based Sprite Animation                                                                          142
Creating an Animation Frame Counter                                                                  143
Creating a Timer Loop                                                                                              143
Changing the Tile to Display                                                                                    143
Advanced Cell-Based Animation                                                                                145
Examining the Tile Sheet                                                                                          145
Creating an Animation Array                                                                                  145
Choosing the Tile to Display                                                                                    146
Looping Through the Tiles                                                                                       146
Drawing the Tile                                                                                                         147
Moving the Image Across the Canvas                                                                     148
Applying Rotation Transformations to an Image                                                     149
Canvas Transformation Basics                                                                                 150
Animating a Transformed Image                                                                             153
Creating a Grid of Tiles                                                                                                 155
Defining a Tile Map                                                                                                   155
Creating a Tile Map with Tiled                                                                                 156
Displaying the Map on the Canvas                                                                          158
Diving into Drawing Properties with a Large Image                                                161
Creating a Window for the Image                                                                           162
Drawing the Image Window                                                                                    162
Changing the ViewPort Property of the Image                                                     164
Changing the Image Source Scale                                                                            166
Panning to a Spot on the Source Image                                                                  167
Pan and Scale in the Same Operation                                                                     168
Pixel Manipulation                                                                                                        170
The Canvas Pixel Manipulation API                                                                       170
Application Tile Stamper                                                                                          172
Copying from One Canvas to Another                                                                      179
Using Pixel Data to Detect Object Collisions                                                            182
The Colliding Objects                                                                                                183
How We Will Test Collisions                                                                                    184
Checking for Intersection Between Two Objects                                                  184
What’s Next?                                                                                                                   190
5. Math, Physics, and Animation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  191
Moving in a Straight Line                                                                                             191
Moving Between Two Points: The Distance of a Line                                          194
viii  |  Table of Contents
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