On 09 Jan 09, at 22:03, Brian Bruinewoud wrote:
I'm an experienced C++ developer but a relative newbie to Objective- C and Cocoa and am learning my way.

I'm porting a program to Mac OS X Cocoa and part of the requirements is a CAD-like functionality. A substantial part of the rest of the program is already written in Cocoa.

I've browsed the example programs that come with XCode and it looks like AppKit/Sketch or Quartz/CarbonSketch are the best to base my implementation from, except that AppKit/Sketch is pure Cocoa and Quartz/CarbonSketch contains no Cocoa.

Quartz/CarbonSketch is - as the name suggests - a Carbon application. Integrating it into an existing Cocoa application will be substantially more difficult than integrating the AppKit sketch example. :)

I've heard that there are some 'gotchas' when it comes to using Quartz directly from Cocoa- is this true? What are they?

I've used Quartz directly from Cocoa and didn't run into any particular difficulties in doing so.
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