1.1 The canvas Element 1

1.2 Canvas Contexts 8

1.3 Canonical Examples in This Book 12

1.4 Getting Started 14

1.5 Fundamental Drawing Operations 22

1.6 Event Handling 26

1.7 Saving and Restoring the Drawing Surface 33

1.8 Using HTML Elements in a Canvas 36

1.9 Printing a Canvas 46

1.10 Offscreen Canvases 51

1.11 A Brief Math Primer 53

1.12 Conclusion 64

2.1 The Coordinate System 67

2.2 The Drawing Model 68

2.3 Drawing Rectangles 70

2.4 Colors and Transparency 72

2.5 Gradients and Patterns 76

2.6 Shadows 83

2.7 Paths, Stroking, and Filling 88

2.8 Lines 103

2.9 Arcs and Circles 124

2.10 Bézier Curves 137

2.11 Polygons 144

2.12 Advanced Path Manipulation 150

2.13 Transformations 170

2.14 Compositing 181

2.15 The Clipping Region 187

2.16 Conclusion 198

3.1 Stroking and Filling Text 202

3.2 Setting Font Properties 207

3.3 Positioning Text 210

3.4 Implementing Text Controls 225

3.5 Conclusion 252

4.1 Drawing Images 254

4.2 Scaling Images 259

4.3 Drawing a Canvas into a Canvas 266

4.4 Offscreen Canvases 270

4.5 Manipulating Images 274

4.6 Clipping Images 302

4.7 Animating Images 306

4.8 Security 312

4.9 Performance 313

4.10 A Magnifying Glass 321

4.11 Video Processing 328

4.12 Conclusion 337

5.1 The Animation Loop 340

5.2 Calculating Frame Rates 358

5.3 Scheduling Tasks at Alternate Frame Rates 359

5.4 Restoring the Background 360

5.5 Double Buffering 364

5.6 Time-Based Motion 367

5.7 Scrolling the Background 370

5.8 Parallax 377

5.9 User Gestures 383

5.10 Timed Animations 385

5.11 Animation Best Practices 390

5.12 Conclusion 391

6.1 Sprites Overview 394

6.2 Painters 398

6.3 Sprite Behaviors 411

6.4 Sprite Animators 417

6.5 A Sprite-Based Animation Loop 424

6.6 Conclusion 425

7.1 Gravity 428

7.2 Warping Time 450

7.3 Time-Warp Functions 456

7.4 Warping Motion 458

7.5 Warping Animation 473

7.6 Conclusion 482

8.1 Bounding Areas 483

8.2 Bouncing Off Walls 488

8.3 Ray Casting 490

8.4 The Separating Axis Theorem (SAT) and Minimum Translation Vector (MTV) 495

8.5 Conclusion 541

9.1 A Game Engine 544

9.2 The Ungame 572

9.3 A Pinball Game 589

9.4 Conclusion 614

10.1 Rounded Rectangles 617

10.2 Progress Bars 625

10.3 Sliders 631

10.4 An Image Panner 643

10.5 Conclusion 655

11.1 The Mobile Viewport 659

11.2 Media Queries 666

11.3 Touch Events 671

11.4 iOS5 677

11.5 A Virtual Keyboard 682

11.6 Conclusion 701

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