By David Gelphman
ISBN-10: 0080459633
ISBN-13: 9780080459639
ISBN-10: 0123694736
ISBN-13: 9780123694737
Written by way of participants of the improvement crew at Apple, Programming with Quartz is the 1st publication to explain the delicate photos procedure of Mac OS X. through the use of the tools defined during this ebook, builders should be capable of absolutely take advantage of the cutting-edge snap shots functions of Mac OS X of their functions, even if for Cocoa or Carbon improvement. This booklet additionally serves as an advent to second photos options, together with how photographs are drawn and the way colour is rendered. It comprises tips for operating with PDF records, drawing bitmap images, utilizing Quartz integrated colour administration, and drawing textual content. Programming with Quartz is a wealthy source for brand new and skilled Mac OS X builders, Cocoa and Carbon programmers, UNIX builders who're migrating to Mac OS X, and someone drawn to robust second photos platforms. * this can be the definitive advisor to the innovative images approach of Mac OS X that makes use of the transportable rfile structure (PDF) because the foundation of its imaging model.* It includes the newest on programming with Quartz for Mac OS X model 10.4.* conscientiously crafted and large code examples convey the right way to accomplish many of the drawing initiatives attainable with Quartz.
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Extra info for Programming with Quartz: 2D and PDF Graphics in Mac OS X
Sample text
Developers who already have a drawing library may find Quartz 2D to be a useful replacement for the lowest-level portions of their drawing library. In such cases, it may make sense to use Quartz 2D directly, even when using Cocoa. Another situation where a Cocoa developer may want to use Quartz directly is when Apple introduces a new feature in Quartz that does not yet have an API in Cocoa. One example of such a feature is Quartz shadings (sometimes called blends). “Cocoa Framework Drawing and Quartz” (page 59) discusses details about when and why Cocoa programmers may want to use Quartz directly instead of the Cocoa drawing API.
This can be accomplished by specifying the phase as the sum of the first two values in the length array (12, 6), or lengths[0]+lengths[1]. Line 6 is a solid line. The code calls the function CGContextSetLineDash, passing NULL for the lengths array and a count of 0. This turns dashing off. You’ll find out other ways to affect the way Quartz strokes paths in “Drawing with Paths” (page 103). Clipping a Drawing Clipping constrains the drawing to a certain area; Quartz doesn’t paint any portion of the drawing that’s outside the clipping area.
The dash pattern begins at the beginning of the stroked segment. The first 12 units of the path are painted with the stroke color, the next 6 units of the path are not painted, and this sequence is repeated until the end of the stroked path is reached. The code draws Line 3 by calling the function CGContextSetLineDash with four items in the lengths array. This specifies a dash pattern of 12 units on, 6 units off, 5 units on, and 6 units off; essentially a long-short repeating pattern. The code 36 Chapter 2 Quartz 2D Drawing Basics draws Line 4 in a similar manner but using six items in the lengths array to define the dash pattern.
Programming with Quartz: 2D and PDF Graphics in Mac OS X by David Gelphman
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