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Moving on a Vector 199

Bouncing Off Walls 204

Bouncing a Single Ball 205

Multiple Balls Bouncing Off Walls 208

Multiple Balls Bouncing with a Dynamically Resized Canvas 214

Multiple Balls Bouncing and Colliding 219

Multiple Balls Bouncing with Friction 232

Curve and Circular Movement 239

Uniform Circular Motion 239

Moving in a Simple Spiral 243

Cubic Bezier Curve Movement 245

Moving an Image 251

Creating a Cubic Bezier Curve Loop 255

Simple Gravity, Elasticity, and Friction 259

Simple Gravity 260

Simple Gravity with a Bounce 263

Gravity with Bounce and Applied Simple Elasticity 266

Simple Gravity, Simple Elasticity, and Simple Friction 270

Easing 273

Easing Out (Landing the Ship) 273

Easing In (Taking Off) 277

Box2D and the Canvas 281

Downloading Box2dWeb 281

How Does Box2dWeb Work? 281

Box2D Hello World 282

Including the Library 282

Creating a Box2dWeb World 282

Units in Box2dWeb 283

Defining the Walls in Box2D 284

Creating Balls 285

Rendering b2debugDraw vs. Canvas Rendering 286

drawScreen() 287

Bouncing Balls Revisited 289

Translating to the Canvas 290

Interactivity with Box2D 293

Creating the Boxes 294

Rendering the Boxes 295

Adding Interactivity 296

Creating Boxes 296

Handling the Balls 297

Box2D Further Reading 303

Table of Contents | ix

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What’s Next? 303

6. Mixing HTML5 Video and Canvas. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 305

HTML5 Video Support 305

Theora + Vorbis = .ogg 305

H.264 + $$$ = .mp4 306

VP8 + Vorbis = .webm 306

Combining All Three 307

Converting Video Formats 307

Basic HTML5 Video Implementation 308

Plain-Vanilla Video Embed 309

Video with Controls, Loop, and Autoplay 311

Altering the Width and Height of the Video 312

Preloading Video in JavaScript 317

Video and the Canvas 321

Displaying a Video on HTML5 Canvas 321

HTML5 Video Properties 327

Video on the Canvas Examples 331

Using the currentTime Property to Create Video Events 331

Canvas Video Transformations: Rotation 335

Canvas Video Puzzle 341

Creating Video Controls on the Canvas 355

Animation Revisited: Moving Videos 364

Capturing Video with JavaScript 369

Web RTC Media Capture and Streams API 370

Example 1: Show Video 370

Example 2: Put Video on the Canvas and Take a Screenshot 373

Example 3: Create a Video Puzzle out of User-Captured Video 376

Video and Mobile 378

What’s Next? 379

7. Working with Audio. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 381

The Basic <audio> Tag 381

Audio Formats 382

Supported Formats 382

Audacity 382

Example: Using All Three Formats 384

Audio Tag Properties, Functions, and Events 385

Audio Functions 385

Important Audio Properties 385

Important Audio Events 386

Loading and Playing the Audio 387

x | Table of Contents

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Displaying Attributes on the Canvas 388

Playing a Sound with No Audio Tag 391

Dynamically Creating an Audio Element in JavaScript 392

Finding the Supported Audio Format 393

Playing the Sound 394

Look Ma, No Tag! 395

Creating a Canvas Audio Player 397

Creating Custom User Controls on the Canvas 398

Loading the Button Assets 399

Setting Up the Audio Player Values 400

Mouse Events 401

Sliding Play Indicator 402

Play/Pause Push Button: Hit Test Point Revisited 403

Loop/No Loop Toggle Button 406

Click-and-Drag Volume Slider 406

Case Study in Audio: Space Raiders Game 416

Why Sounds in Apps Are Different: Event Sounds 416

Iterations 416

Space Raiders Game Structure 417

Iteration #1: Playing Sounds Using a Single Object 426

Iteration #2: Creating Unlimited Dynamic Sound Objects 427

Iteration #3: Creating a Sound Pool 429

Iteration #4: Reusing Preloaded Sounds 431

Web Audio API 435

What Is the Web Audio API? 436

Space Raiders with the Web Audio API Applied 436

What’s Next? 439

8. Canvas Games: Part I. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 441

Why Games in HTML5? 441

Canvas Compared to Flash 442

What Does Canvas Offer? 442

Our Basic Game HTML5 File 442

Our Game’s Design 444

Game Graphics: Drawing with Paths 444

Needed Assets 445

Using Paths to Draw the Game’s Main Character 445

Animating on the Canvas 448

Game Timer Loop 448

The Player Ship State Changes 449

Applying Transformations to Game Graphics 451

The Canvas Stack 451

Table of Contents | xi

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Game Graphic Transformations 453

Rotating the Player Ship from the Center 453

Alpha Fading the Player Ship 455

Game Object Physics and Animation 456

How Our Player Ship Will Move 456

Controlling the Player Ship with the Keyboard 458

Giving the Player Ship a Maximum Velocity 462

A Basic Game Framework 463

The Game State Machine 463

The Update/Render (Repeat) Cycle 467

The FrameRateCounter Object Prototype 469

Putting It All Together 471

Geo Blaster Game Structure 471

Geo Blaster Global Game Variables 475

The Player Object 476

Geo Blaster Game Algorithms 477

Arrays of Logical Display Objects 477

Level Knobs 479

Level and Game End 480

Awarding the Player Extra Ships 481

Applying Collision Detection 481

The Geo Blaster Basic Full Source 483

Rock Object Prototype 484

Simple A* Path Finding on a Tile Grid 486

What Is A*? 486

A* Applied to a Larger Tile Map 493

A* Taking Diagonal Moves into Account 498

A* with Node Weights 502

A* with Node Weights and Diagonals 506

Moving a Game Character Along the A* Path 514

Tanks That Pass Through Walls? 518

What’s Next? 528

9. Canvas Games: Part II. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 529

Geo Blaster Extended 529

Geo Blaster Tile Sheet 530

Rendering the Other Game Objects 535

Adding Sound 541

Pooling Object Instances 546

Adding a Step Timer 548

Creating a Dynamic Tile Sheet at Runtime 550

A Simple Tile-Based Game 555

xii | Table of Contents

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Micro Tank Maze Description 556

The Tile Sheet for Our Game 556

The Playfield 558

The Player 559

The Enemy 560

The Goal 561

The Explosions 561

Turn-Based Game Flow and the State Machine 562

Simple Tile Movement Logic Overview 566

Rendering Logic Overview 568

Simple Homegrown AI Overview 569

Micro Tank Maze Complete Game Code 570

Scrolling a Tile-Based World 570

First, a Tile Sheet That Contains the Tiles We Want to Paint to the Screen 570

Second, a Two-Dimensional Array to Describe Our Game World 571

Third, Paint the Tile-Based World to the Canvas 571

Coarse Scrolling vs. Fine Scrolling 572

The Camera Object 572

The World Object 573

Fine Scrolling the Row and Column Buffers 574

Coarse Scrolling Full Code Example 580

Fine Scrolling Full Code Example 585

What’s Next? 589

10. Going Mobile!. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 591

The First Application 591

The Code 592

Examining the Code for BSBingo.html 597

The Application Code 600

Scaling the Game for the Browser 601

Testing the Game on an Actual Device 606

Retro Blaster Touch 607

Mobilizing Retro Blaster Touch 610

Jumping to Full Screen 610

Touch Move Events 612

Retro Blaster Touch Complete Game Code 618

Beyond the Canvas 619

What’s Next? 619

11. Further Explorations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 621

3D with WebGL 621

What Is WebGL? 621

Table of Contents | xiii

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How Does One Test WebGL? 622

How Do I Learn More About WebGL? 622

What Does a WebGL Application Look Like? 623

Further Explorations with WebGL 628

WebGL JavaScript Libraries 629

Multiplayer Applications with ElectroServer 5 630

Installing ElectroServer 631

The Basic Architecture of a Socket-Server Application 634

The Basic Architecture of an ElectroServer Application 634

Creating a Chat Application with ElectroServer 636

Testing the Application in Google Chrome 641

Further Explorations with ElectroServer 642

This Is Just the Tip of the Iceberg 645

Creating a Simple Object Framework for the Canvas 646

Creating the Drag-and-Drop Application 646

Application Design 647

Windows 8 Apps and the HTML5 Canvas 659

What’s Next in HTML5.1 and Canvas Level 2? 663

HTML5.1 Canvas Context 663

Canvas Level-2 664

Conclusion 664

A. Full Code Listings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 667

Index. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 711

xiv | Table of Contents

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Preface

Introduction to the Second Edition

In the past two years, since the release of this book, usage of the HTML5 Canvas has

grown by leaps and bounds. The original edition of this book was one of the first pub‐

lications dedicated to the Canvas. While we were proud to get out of the gate fast, it also

meant that we had to do a lot of research and exploration of our own. Back in 2011,

there were only a handful of examples of HTML5 Canvas applications, and still fewer

tutorials. In 2013, the landscape has changed. There are many resources to choose from

regarding the HTML5 Canvas, from frameworks and APIs to dedicated websites and

books. To create this second edition, we took a hard look at what worked and what did

not work the first time around. The following sections describe some of the exciting

changes and updates that you can look forward to within these pages.

First Edition Updates

Most of the content from the first edition of this book remains intact. It remains because

this book is geared towards a wide range of developers, from those who have never seen

a Canvas to those who want to learn some intermediate-to-advanced ways to make use

of the Canvas.

Every chapter has been revised with updated code and optimizations, as well as updates

to address browser compatibility and other issues that have arisen over the past two

years. A few parts have been removed. Some of the redundant code listings have been

moved to the source distribution to make the book easier to read. We have also replaced

parts of Chapter 4 with more, shorter demos, and we’ve completely rewritten Chap‐

ter 10 to remove the discussion of Phonegap because similar content is now widely

available.

We have also added a ton of new content that we believe will help take your Canvas

applications to the next level. This includes the following:

• A new animated Hello World application

• A discussion of accessibility and the sub-dom concept

• Multiple methods to clear the Canvas

• Finding points in the current path

• Drawing focus rings

• Animating gradients with text

• Using pixel data to detect collisions

• Five new examples that focus on using Box2Dweb for physics-based animations

• Using getUserMedia() to capture video on the Canvas

• Making use of the new Web Audio API

• A* path finding and animation

• Coarse and fine tile-based scrolling

• Development of mobile web (iOS) full-screen, scaled applications

• A new game named Retro Blaster Touch

• A new drag-and-drop example

• A discussion of building your own Canvas application framework

• A short tutorial for building an HTML5 application for Windows 8

What You Need to Run the Examples in the Book

The best part about the programming HTML5 Canvas is that the barrier to entry is very

low. All you need is a modern web browser and a text editor.

As far as compatible browsers go, we suggest that you download and use the latest

version of the following web browsers. The browsers are listed in the order that we

suggest you test them:

• Chrome

• Safari

• Firefox

• Internet Explorer (version 10)

• Opera

Every example in this book was tested with Google Chrome, Safari, and Firefox. While

we made every attempt to ensure that these examples worked across as many browsers

as possible, we suggest that you use Google Chrome or Safari for the best results.

xvi | Preface

What You Need to Know

It would be good if you knew your way around programming in some kind of modern

language like C, C++, C#, ActionScript 2, ActionScript 3, Java, or JavaScript. However,

we will introduce the Canvas in the first chapter in a way that should ease you into web

programming at the same time.

For Flash developers

JavaScript and ActionScript 1 are essentially the same language. While Adobe took

some liberties with ActionScript 2, you should be very comfortable with JavaScript.

If you have experience with only ActionScript 3, JavaScript might feel like a step

backwards.

For Silverlight/C# developers

Take a deep breath, and think about a time before ASP.NET/C# when you might

have had to develop web apps in VBScript. Keep your mind there, because that is

just about the same space you are about to enter.

How This Book Is Organized

This book is organized into 11 chapters. All the chapters in the second edition have been

updated, revised, and expanded. The first four chapters step you through the HTML

Canvas API by example. The topics covered include text, images, and drawing. These

chapters contain a few finished apps, but for the most part consist of demos designed

to show you the facets of the Canvas API. The next six chapters build upon the Canvas

API by expanding the scope of the examples to application length. In these chapters, we

discuss math and physics applications, video, audio and games, and mobile. The final

chapters introduce a few experimental areas: 3D, multiplayer, Windows 8, and a Canvas

object model.

What you won’t get in this book is a simple run-down and retelling of the published

W3C Canvas API. While we cover portions of the API in detail, some of it is not ap‐

plicable to games. However, if you want to explore the API further, you can find it at

this site.

Instead, we want to bring to light the ways the Canvas can be used to create animation,

games, and entertainment applications for the Web and mobile web.

Conventions Used in This Book

The following typographical conventions are used in this book:

Italic

Indicates new terms, URLs, email addresses, filenames, and file extensions.

Preface | xvii

Constant width

Used for program listings, as well as within paragraphs to refer to program elements

such as variable or function names, databases, data types, environment variables,

statements, and keywords.

Constant width bold

Shows commands or other text that should be typed literally by the user.

Constant width italic

Shows text that should be replaced with user-supplied values or by values deter‐

mined by context.

This icon signifies a tip, suggestion, or general note.

This icon indicates a warning or caution.

Using Code Examples

This book is here to help you get your job done. In general, if this book includes code

examples, you may use the code in your programs and documentation. You do not need

to contact us for permission unless you’re reproducing a significant portion of the code.

For example, writing a program that uses several chunks of code from this book does

not require permission. Selling or distributing a CD-ROM of examples from O’Reilly

books does require permission. Answering a question by citing this book and quoting

example code does not require permission. Incorporating a significant amount of ex‐

ample code from this book into your product’s documentation does require permission.

We appreciate, but do not require, attribution. An attribution usually includes the title,

author, publisher, and ISBN. For example: “HTML5 Canvas, Second Edition by Steve

978-1-449-33498-7.”

If you feel your use of code examples falls outside fair use or the permission given above,

feel free to contact us at permissions@oreilly.com .

xviii | Preface

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