Re: Inviting to comment on Cocoa categories
Re: Inviting to comment on Cocoa categories
- Subject: Re: Inviting to comment on Cocoa categories
- From: Graham Cox <email@hidden>
- Date: Mon, 10 Nov 2008 14:49:09 +1100
On 10 Nov 2008, at 1:55 pm, Kyle Sluder wrote:
Please be aware that rotation around a point other than the origin is
not a linear transformation. This may be why such functionality was
omitted from NSAffineTransform.
It is linear. But maybe what you're referring to is that it's easy to
screw up a combination of rotation, scaling and translation so that a
shape - say a rect - gets inadvertently skewed and becomes a
trapezoid. That's still a linear transformation, but quite often
definitely not what you want.
--Graham
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