September 2002
Intermediate to advanced
1272 pages
31h 12m
English
Content preview from Cocoa® Programming
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Coordinate System Transformations
The NSAffineTransform class can warp the drawing canvas. The main purpose of this is to enable a single NSBezierPath object to define a path that can be used multiple times. In the star example in Chapter 12, four different stars are drawn at four different locations. They are all drawn using the same NSBezierPath object, without changing the object’s path or the location of its points. Moving the canvas, or translation, is one of the ways that NSAffineTransform can alter drawing. It can also perform scaling (changing the size) and rotation. Other effects such as skew are also possible. Slanting is an example of skewing. After skewing, what was once a right angle is no longer a right angle.
Defining an NSAffineTransform ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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