Re: Drawing in a view with alpha < 1.0 shows windows behind
Re: Drawing in a view with alpha < 1.0 shows windows behind
- Subject: Re: Drawing in a view with alpha < 1.0 shows windows behind
- From: Uli Kusterer <email@hidden>
- Date: Tue, 31 Mar 2015 15:42:18 +0200
> On 31 Mar 2015, at 14:39, Eyal Redler <email@hidden> 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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