On 01/08/2010, at 9:28 PM, Nick Rogers wrote:

> Please take a look at the attached image.
> 
> Please suggest what I am doing wrong or need to do.


This is a really terrible way to make a hex viewer. Consider using NSTextView 
or just use a custom view (I think I've seen a 3rd party open source hex editor 
view "out there" somewhere also).

That said it should work (with very poor performance). You say this is a 
NSMatrix subclass. Are you drawing a gradient background? If so, a typical 
error is to fill the <rect> passed to -drawRect: with the gradient instead of 
filling the view's bounds. The <rect> parameter is the area needing update, not 
the whole view.

--Graham


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