[APPLE] Quartz 2D Programming Guide (2010).pdf

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Quartz 2D Programming Guide
Graphics & Animation: 2D Drawing
2010-11-19
Apple Inc.
© 2001, 2010 Apple Inc.
All rights reserved.
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Contents
Introduction
Introduction 15
Who Should Read This Document? 15
Organization of This Document 15
See Also 16
Chapter 1
Overview of Quartz 2D 19
The Page 19
Drawing Destinations: The Graphics Context 20
Quartz 2D Opaque Data Types 22
Graphics States 23
Quartz 2D Coordinate Systems 24
Memory Management: Object Ownership 26
Chapter 2
Graphics Contexts 29
Drawing to a View Graphics Context in iOS 29
Creating a Window Graphics Context in Mac OS X 29
Creating a PDF Graphics Context 31
Creating a Bitmap Graphics Context 35
Supported Pixel Formats 39
Anti-Aliasing 40
Obtaining a Graphics Context for Printing 41
Chapter 3
Paths 43
Path Creation and Path Painting 43
The Building Blocks 44
Points 45
Lines 45
Arcs 45
Curves 47
Closing a Subpath 48
Ellipses 49
Rectangles 49
Creating a Path 50
Painting a Path 51
Parameters That Affect Stroking 51
Functions for Stroking a Path 54
Filling a Path 54
Setting Blend Modes 55
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2010-11-19 | © 2001, 2010 Apple Inc. All Rights Reserved.
CONTENTS
Clipping to a Path 64
Chapter 4
Color and Color Spaces 67
About Color and Color Spaces 67
The Alpha Value 68
Creating Color Spaces 69
Creating Device-Independent Color Spaces 70
Creating Generic Color Spaces 70
Creating Device Color Spaces 71
Creating Indexed and Pattern Color Spaces 71
Setting and Creating Colors 71
Setting Rendering Intent 73
Chapter 5
Transforms 75
About Quartz Transformation Functions 75
Modifying the Current Transformation Matrix 76
Creating Affine Transforms 80
Evaluating Affine Transforms 81
Getting the User to Device Space Transform 82
The Math Behind the Matrices 82
Chapter 6
Patterns 85
The Anatomy of a Pattern 85
Colored Patterns and Stencil (Uncolored) Patterns 88
Tiling 89
How Patterns Work 89
Painting Colored Patterns 90
Write a Callback Function That Draws a Colored Pattern Cell 90
Set Up the Colored Pattern Color Space 91
Set Up the Anatomy of the Colored Pattern 92
Specify the Colored Pattern as a Fill or Stroke Pattern 93
Draw With the Colored Pattern 93
A Complete Colored Pattern Painting Function 93
Painting Stencil Patterns 95
Write a Callback Function That Draws a Stencil Pattern Cell 95
Set Up the Stencil Pattern Color Space 96
Set Up the Anatomy of the Stencil Pattern 97
Specify the Stencil Pattern as a Fill or Stroke Pattern 97
Drawing with the Stencil Pattern 98
A Complete Stencil Pattern Painting Function 98
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2010-11-19 | © 2001, 2010 Apple Inc. All Rights Reserved.
CONTENTS
Chapter 7
Shadows 101
How Shadows Work 102
Shadow Drawing Conventions Vary Based on the Context 102
Painting with Shadows 102
Chapter 8
Gradients 105
Axial and Radial Gradient Examples 105
A Comparison of CGShading and CGGradient Objects 108
Extending Color Beyond the End of a Gradient 109
Using a CGGradient Object 110
Using a CGShading Object 113
Painting an Axial Gradient Using a CGShading Object 114
Painting a Radial Gradient Using a CGShading Object 120
See Also 124
Chapter 9
Transparency Layers 125
How Transparency Layers Work 126
Painting to a Transparency Layer 126
Chapter 10
Data Management in Quartz 2D 129
Moving Data into Quartz 2D 130
Moving Data out of Quartz 2D 131
Moving Data Between Quartz 2D and Core Image in Mac OS X 132
Chapter 11
Bitmap Images and Image Masks 135
About Bitmap Images and Image Masks 135
Bitmap Image Information 136
Decode Array 137
Pixel Format 137
Color Spaces and Bitmap Layout 137
Creating Images 139
Creating an Image From Part of a Larger Image 140
Creating an Image from a Bitmap Graphics Context 142
Creating an Image Mask 142
Masking Images 143
Masking an Image with an Image Mask 143
Masking an Image with an Image 145
Masking an Image with Color 146
Masking an Image by Clipping the Context 149
Using Blend Modes with Images 151
Normal Blend Mode 152
5
2010-11-19 | © 2001, 2010 Apple Inc. All Rights Reserved.

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