Here are quick recaps of our first three meetings of 2013.

January: Anton Marini talked about OpenGL in the context of Quartz Composer plug-ins. It was a fast-paced meeting, with one of the longer presentations and Q&A sessions that we've had. If I ever find my notes from the meeting I'll add them here.

• Anton also works on Syphon, which was his alternate option for his presentation topic.

February: Demitri gave an introduction to Core Image. I'm really glad Demitri presented, because this was his last CocoaHeadsNYC before moving to Columbus, OH.

• Demo code.
• Quartz Composer composition.
• An NSDateFormatter pitfall that Natalie mentioned during open discussion.

March: I talked about how I resolved four problems I ran into while working on UI details in AppKiDo. Kevin Doughty did a show-and-tell of what he's doing with additive animation.

• My slides. Note: I've sinced changed my approach to the key-view-loop problem, so it's no longer as described in the slides. I added a class called AKTabChain (.h, .m), which takes a delegate, and I overrode sendEvent: in my application class. At some point I'll write a class comment that explains it all. I'd also like to try Avi Drissman's suggestion to use an event tap.
• Kevin's sample code on GitHub.