Re: again with paths and images
Re: again with paths and images
- Subject: Re: again with paths and images
- From: "douglas a. welton" <email@hidden>
- Date: Thu, 21 Dec 2006 12:39:05 -0500
Your situation seems like a perfect fit for using Core Image. Create
a CIImage, draw it into the first view, then apply a the crop and
scale CIFilters (CICrop & CILanczosScaleTransform ) and draw the
image into the second view. All the work gets done on the GPU,
roughly in realtime.
regards,
douglas
On Dec 21, 2006, at 6:13 AM, Livio Isaia wrote:
Skip this if you have no time to loose!
I know that my problem seems a bit strange, if not silly, but
here's the reason why.
I have two views into which I draw the same image: in the first one
at normal size, in the second in a scaled size (bigger) so that the
user can clearly see each image pixel. Practically a pixel in the
first view will become a 6x6 rect in the second one.
Now, if I draw a bezier path (let's say an oval one, for example)
in the first, I want it to be drawn also in the second, but here
pixels will become rects, and if I use a scaling transformation
I'll get a bigger oval but not a sequence of rects. Hope it's clear...
That's why I thought to draw it all in one image and then draw it
in a bigger rect (after all the final result will be a single
image...). Of course it' not a great solution, and it's expensive
in terms of time and memory.
I tried to calculate the path rects using formulas but with no
exciting results (do you know where to find the formulas used in
bezier paths?).
So any idea will be apreciated!
Thanks again to everybody,
livio.
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