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A Hands-On Guide and Introduction to Quartz 2D
Quartz 2D Graphics for Mac OS X® Developers is a hands-on guide and introduction to Quartz 2D. Differences between the interfaces and features of QuickDraw and Quartz 2D are making the switch challenging for developers. Through in-depth practical coverage, Mac developer and consultant Scott Thompson leads you smoothly through the transition and sets you on the path to developing cutting edge graphics in Core Image. If you depend on QuickDraw for your graphics needs, or are interested in a system that pushes the envelope in computer graphics, now is the time to make the switch to Core Graphics (Quartz 2D, Core Image). This is the book that walks you through that changeâstep-by-step! Preface xv ![]() Chapter 2: From QuickDraw to Quartz 2D 15 Chapter 4: The Graphics Context 69 Chapter 6: Line ArtâBuilding Paths 135 Chapter 8: Image Basics 177 Chapter 10: Drawing with Core Image 223 Chapter 12: Drawing Offscreen 265 Chapter 14: Working with PDF 299
Quartz not only handles many of the responsibilities of QuickDraw, it is the platform on which many of the innovations in the Mac OS X graphics system are built. For example, Core Graphics has taken over the job of collecting the images of windows and combing them on the screen. In performing this task, it takes advantage of modern graphics hardware to improve performance and introduce features such as translucent windows to the system. The end result is a remarkably flexible graphics system. Quartz allows applications to seamlessly integrate technologies as diverse as the motion graphics of QuickTime and the 3D graphics of OpenGL onto the same screen or even into the same window.
With the introduction of Mac OS X 10.4, Tiger, Apple has deprecated QuickDrawâand that library will not evolve any farther. Applications that only rely on QuickDraw for drawing will not enjoy any innovations Apple makes in the graphics system. Even worse, in the future, applications that rely on QuickDraw may actually pay a performance penalty. Any program that wants to take full advantage of the graphics system on Mac OS X will have to replace their QuickDraw drawing code with a more modern alternative. Apple recommends that application developers replace their QuickDraw graphics code with similar code that uses Quartz 2D.
Quartz 2D is a part of the Core Graphics system. It is a modern graphics library based on the imaging model that Adobe created originally for PostScript printers and later as part of the PDF graphics file format. This is the same imaging model that graphics professionals have used for several years to create the artwork on everything from books and advertisements to application splash screens and on-line games.
The Quartz 2D drawing model allows you to create sophisticated graphics with a simple API. The Quartz 2D imaging model is quite different from the drawing models of other graphics libraries. Its library can draw to many kinds of graphics devices while maximizing the fidelity of the graphics on each device. As a result, developers familiar other graphics libraries such as QuickDraw, GDI from Microsoft Windows, or the graphics portions of X11's XLib face a learning curve when trying to work with the device and resolution independent drawing model in Quartz 2D.
The objective of this book is to present a practical introduction to Quartz 2D. Its aim is to help all programmers understand the Quartz 2D imaging model and make effective use of the library from any application environment. Most importantly, the text compares and contrasts the Quartz 2D imaging model with the pixel-based graphics models of other libraries. While this will be of particular value to developers making the transition from QuickDraw or GDI to Quartz 2D, it also provides valuable insight into how to use Quartz 2D effectively. The hope is that this information will be invaluable to anyone trying to draw graphics using Quartz 2D.
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