Re: CGPoint wrapper?
Re: CGPoint wrapper?
- Subject: Re: CGPoint wrapper?
- From: "Ken Ferry" <email@hidden>
- Date: Thu, 23 Oct 2008 00:06:32 -0700
On Wed, Oct 22, 2008 at 9:09 PM, Graff <email@hidden> wrote:
> On Oct 22, 2008, at 5:49 PM, DKJ wrote:
>
> Is there some straightforward way of wrapping a CGPoint so I can put
>> it in an NSArray? I don't want to use a C array because I want to have
>> fast enumeration available. Or should I just write a simple NSPoint -
>> CGPoint conversion method?
>>
>
> NSPoint and CGPoint are structs that are essentially the same. You can
> convert between them with a simple cast:
>
> NSPoint point = *(NSPoint *)&myCGPoint;
>
> <
> http://developer.apple.com/documentation/Cocoa/Conceptual/CocoaDrawingGuide/QuartzOpenGL/chapter_10_section_2.html
> >
>
>
> You can also use the function NSPointFromCGPoint() which does the exact
> same thing for you:
>
> NSPoint point = NSPointFromCGPoint(myCGPoint);
>
> (Declared in NSGeometry.h)
The function is actually implemented a bit better than the cast above, in
that the function does not violate strict aliasing[1].
-Ken
[1]:
http://www.cellperformance.com/mike_acton/2006/06/understanding_strict_aliasing.html
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