Re: NSShadow with [bezierPath addClip]
Re: NSShadow with [bezierPath addClip]
- Subject: Re: NSShadow with [bezierPath addClip]
- From: David Duncan <email@hidden>
- Date: Wed, 01 Jan 2014 17:44:01 -0800
In CoreGraphics the way you would do this is to setup your shadow parameters, then start a transparency layer, do your drawing there, then composite that back to the original context. Something like this:
CGContextSetShadow(context, shadowOffset, shadowBlur);
CGContextBeginTransparencyLayer(context, NULL);
// do your drawing
CGContextEndTransparencyLayer(context);
You could get the graphicsPort from the NSGraphicsContext to call the transperancy layer methods and otherwise stick to NSGraphics stuff.
On Dec 31, 2013, at 4:15 AM, Leonardo <email@hidden> wrote:
> In my NSView subclass, I have to draw an image within a bezierPath and apply
> an NSShadow to the result.
> So within the drawRect: method I add
>
> [bezierPath addClip];
> [mImage drawInRect:inRect fromRect:fromRect
> operation:NSCompositeSourceOver fraction:mOpacity];
>
> It works. The image gets clipped by the path.
> Now I would like to apply the NSShadow to the result, so before those lines
> above I add
>
> [bezierPath addClip];
> [mShadow set];
> [mImage drawInRect:inRect fromRect:fromRect operation:NSCompositeSourceOver
> fraction:mOpacity];
>
> I can't get the shadow drawn because the bezierPath is clipping the drawing
> area where the shadow should fall.
> How to solve this trouble?
> I have tried to use a layer, but I get weird results when I resize, rotate
> and modify other parameters of the view.
>
>
> Regards
> -- Leonardo
>
>
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--
David Duncan
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