Thanks Uli, Using NSRectFillUsingOperation( box, NSCompositeSourceAtop ) did the trick.
Thanks to all who answered. I've been developing for mac for over 20 years and I find it really odd that I've never came across this behaviour. Eyal > On Mar 31, 2015, at 4:42 PM, Uli Kusterer <witness.of.teacht...@gmx.net> > wrote: > > >> On 31 Mar 2015, at 14:39, Eyal Redler <eyred...@netvision.net.il> wrote: >> I'm working on a custom view. I'm using the following code to draw the view >> >> [[NSColor colorWithDeviceRed:(float)42/255 >> green:(float)49/255 >> blue:(float)58/255 >> alpha:0.5] set]; >> NSRectFill([self bounds]); >> >> [[NSColor colorWithDeviceRed:(float)242/255 >> green:(float)110/255 >> blue:(float)80/255 >> alpha:1.0] set]; >> >> NSFrameRect([self bounds]); > > NSRectFill uses the context's default compositing operation, which usually is > NSCompositeCopy. You probably want to use NSRectFillUsingOperation( box, > NSCompositeSourceAbove ) or so. (this is from memory, it might be a different > compositing mode, but it's definitely not "Copy")
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