March 2012
Intermediate to advanced
590 pages
22h 48m
English
Content preview from iOS Programming: The Big Nerd Ranch GuideBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Core Graphics
The functions and types that begin with CG come from the Core Graphics framework, a C language API for 2D drawing. The hub of the Core Graphics framework is CGContextRef: all other Core Graphics functions and types interact with a drawing context in some way, and then the context creates an image.
Let’s look at the Core Graphics functions you used in the implementation of HypnosisView’s drawRect: method. You set up the drawing state with CGContextSetLineWidth and then set its color using CGContextSetRGBStrokeColor.
Next, you added a path to the context using CGContextAddArc. A path is a collection of points that forms a shape and can form anything from a square to a circle to a human outline. There are a number of Core Graphics ...
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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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.