Quartz 2D Graphics for Mac OS X Developers by R. Scott Thompson

By R. Scott Thompson

Middle pics is the recent photographs framework for Mac OS X. Quartz, the second drawing process, and middle photo, which strategies either video and nonetheless pictures, are the most important new applied sciences during this framework and supply the instruments Mac OS X builders have to create and draw pictures for his or her purposes that concentrate on the design-savvy Mac patron viewers. With the evolution of Mac OS X, Apple is phasing out use of its prior photographs framework, QuickDraw, and inspiring all builders to start utilizing center images. The version for Quartz is totally specific and completely diverse from QuickDraw making a steep studying curve for all builders relocating over. This ebook is in an creation and consultant to operating with center pix, particularly Quartz and middle photo. It incorporates the developer in the course of the primary Quartz versions and easy innovations reminiscent of drawing, coordinating method fundamentals, digital paint, and CGContext. as soon as the basics are coated, writer Scott Thompson delves into extra complicated subject matters akin to shading, styles, and manipulating photo results. sensible code examples increase the dialogue and supply Mac builders the data they should include those strong pix into their very own Mac OS X purposes.

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In this environment, writing software that supports the variations of the written word is quite a complex process. Mac OS X handles the complexity by breaking the text layout and presentation process into a number of discrete steps. In the first step, the computer converts the text that a user types into a collection of drawings called glyphs. The computer may use the same character to represent the letter "A," but that A will be represented by a very different glyph when drawn in Times than when it is drawn in Helvetica.

Quartz allows each color to have an alpha channel that describes the translucency of that color. Primitives drawn with opaque colors completely replace the drawing context beneath them. Paints with more transparency, corresponding to lower alpha channel values, allow more of the graphics already drawn into the context to show through. 38 39 When layering line art into a context, Quartz has to convert paths into a set of pixels to color. This process has been touched upon briefly a couple of times but will now be looked at in more depth.

Png"), kCFURLPOSIXPathStyle, false, desktopURL); CFRelease(desktopURL); // Export our image into that png file. CGImageDestinationRef exportDestination = CGImageDestinationCreateWithURL(destinationURL, kUTTypePNG, 1, NULL); CGImageDestinationAddImage(exportDestination, image, NULL); CGImageDestinationFinalize(exportDestination); CFRelease(exportDestination); CFRelease(destinationURL); CGImageRelease(image); free(bitmapData); CFRelease(kGenericRGBColorSpace); return 0; } The source code begins by defining some color constants.

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