Re: Annotating on a NSImageView

FROM : daniel
DATE : Sat Oct 30 20:02:48 2004

I think you need to do the math yourself.  The only "safely" 
predictable NSImageView is the one with no borders, no bezel, etc.  If 
you use this one, the image should take up the entire frame of the 
view, so you can just compare the image dimensions with the view 
dimension to get an X and Y scale value.  If you're using an 
NSImageView with borders, then you'll have to take into consideration 
the amount of space taken up by the border.  Since this can probably 
change in a future release, I wouldn't want to depend on any guesses 
made regarding that.

Daniel

On Oct 30, 2004, at 10:06 AM, Paul Sargent wrote:

> Hi,
>
> I'm wanting to display an image and then add annotations on top of the 
> image. An example might be a selection marquee in a photo editing 
> program (not exactly what I'm doing but it gives an idea). My idea was 
> to subclass an NSImageView, and then in drawRect call [super drawRect] 
> first and then do some CG* calls to add my annotations.
>
> My problem is that NSImageView will scale the image depending on how 
> big the view is. How do I know what scaling NSImageView has decided 
> upon so that I can draw my annotations at the same scale?
>
> Thanks
>
> Paul
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