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Re: NSBezierPath compositing

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Re: NSBezierPath compositing

Subject: Re: NSBezierPath compositing
From: "John C. Randolph" <email@hidden>
Date: Wed, 16 Mar 2005 14:25:43 -0800


On Mar 9, 2005, at 6:05 AM, Simon Bovet wrote:

Is there a way to change the composite operation for a - [NSBezierPath fill] ? I actually want to erase a non-rectangular portion of an NSImage.
For rectangular areas, I can of course use:
    [myImage lockFocus];
    [[NSColor clearColor] set];
    NSRectFill(myRect);
    /* or
    NSRectFillUsingOperation(myRect, NSCompositeCopy); */
    [myImage unlockFocus];
What if I want to erase an arbitrary Bezier path? [myBezierPath fill] won't do anything since it is always using the NSCompositeSourceOver operation...

For Panther and earlier, you can do it the way I did in the "Cropped Image" sample, at:

http://developer.apple.com/samplecode/Cropped_Image/Cropped_Image.html

-jcr


John C. Randolph <email@hidden> (408) 974-8819
Sr. Cocoa Software Engineer,
Apple Worldwide Developer Relations
http://developer.apple.com/cocoa/index.html

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  >NSBezierPath compositing (From: Simon Bovet <email@hidden>)




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