Re: Moveable/Resizable "Box" views and blurry frame
Re: Moveable/Resizable "Box" views and blurry frame
- Subject: Re: Moveable/Resizable "Box" views and blurry frame
- From: Yann Bizeul <email@hidden>
- Date: Wed, 1 Aug 2007 15:09:03 +0200
Ok I tried some stuff and it seem I almost get a perfect result.
The problem is to convert the rectangle I'm drawing the frame to the
pixel value in a 1:1 coordinate system, the window for example.
I can't just rely on my view frame because setting its frame to an
integral rect will not avoid its superview to not have a non-integral
rect.
On the other end, I can't use convertRect:toView:nil to get the rect
in window coordinate system because it does not look to deal well
with zooming.
The only solutions that comes to my mind would be to recursively get
each superview frame coordinate until I get my contentView but it
looks like a big overhead.
Thanks
Yann Bizeul - yann at tynsoe.org
Cocoa Developer
Tynsoe Projects
BuddyPop - GeekTool - SSH Tunnel Manager - ...
http://projects.tynsoe.org/
Le 31 juil. 07 à 19:03, Clark Cox a écrit :
On 7/31/07, Yann Bizeul <email@hidden> wrote:
Thanks for your answer,
The problem is that, when zoomed, 0.5 is no longer in the middle
of a
pixel. You have to scale that offset
Yes, I'm aware of that, and that is what I tried too.
I determine my scale by getting the ratio of my contentView's frame
and my contentView's bounds (You mentioned NSScreen and NSWindow
methods, but this is not applicable here, I'm not talking about
resolution independance drawing, but drawing in a zoomed
NSScrollView)
Yes, but the basic principle still holds. You are converting from
points to pixels, and want integral pixels. Therefore, you need to
find the values in "points" that represent integer pixel-indices.
But I can't get the magic formula to apply in the drawRect method
of my view.
As outlined on the linked page:
1) Scale the rect by your scaling factor (moving you from
"point"-space to "pixel"-space)
2) Round the rect to integers, using NSIntegralRect. (still in
"pixel" space)
3) Offset the rect's origin by (0.5,0.5).
4) Scale the rect by the inverse of your scaling factor (giving you
the "points" that represent integral pixel indices)
I tried to draw the rect by after applying a 0.5*ratio offset,
without success, which makes sense to me since I'm not even sure to
be on integer coordinates. But even using NSIntegralRect on my frame
do not solve the problem.
The key is *when* you do each of these things. If you use
NSIntegralRect on values that are still in "point" space, then you
will get integer points, not integer pixel indices; if, on the other
hand, you use NSIntegralRect on values in pixel-space, you will get
integer pixel indices.
--
Clark S. Cox III
email@hidden
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