Re: NSImage > trapezium...

FROM : Luca
DATE : Sun Mar 23 15:38:01 2008

I think CIPerspectiveTransform is my perfect solution. Thanks Glenn 
Andreas!

And thanks Cathy for the quick reply.

Il giorno 23/mar/08, alle ore 15:10, glenn andreas ha scritto:

>
> On Mar 23, 2008, at 8:54 AM, Cathy Shive wrote:

>> On Mar 23, 2008, at 2:14 PM, Luca wrote:
>>

>>> Hello. Do you know how can I transform a rectangular image in a 
>>> trapezium?

>>
>> Seriously?
>>
>> You aren't going to be able to distort your bitmap like this with 
>> NSImage and there is no ready-made CIFilter to do this distortion 
>> that I'm aware of.  If I'm wrong about that, then that's the way to 
>> go.  But,  I think you've gotta do your own pixel pushing for this 
>> one.
>>

>
> Actually, the CIPerspectiveTransform will do this perfectly (you 
> even just give it the resulting four corner points)
>
> You can't do that will an affine transform though (since perspective 
> is, by definition, non-affine), so you'll need to use CoreImage.
>
>
> Glenn Andreas                      <email_removed>
> <http://www.gandreas.com/> wicked fun!
> quadrium | flame : flame fractals & strange attractors : build, 
> mutate, evolve, animate
>
>
>