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Re: override drawRect

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Re: override drawRect

Subject: Re: override drawRect
From: "John C. Randolph" <email@hidden>
Date: Thu, 18 Nov 2004 15:02:58 -0800


On Nov 18, 2004, at 11:50 AM, email@hidden wrote:

Is it possible to override an NSView's ( or any of its subclasses) "drawRect:" method so that i can flip the coordinate system before its called? I want the graphicsContext to have a coordinate system much like that of a QuickDraw CGrafPtr.

Well, overriding -drawRect: is what you'll need to do for any custom drawing in the first place, and the coordinate system of your own view is yours to manipulate as you like for your own convenience.

See the NSView documentation for -isFlipped, -scaleUnitSquareToSize:, -setBoundsRotation:, and other methods that alter the view's coordinate system.

-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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