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Drawing aside of -drawRect

From: Tima Vaisburd
Subject: Drawing aside of -drawRect
Date: Mon, 8 Sep 2003 21:03:14 -0700
User-agent: KMail/1.4.3

Hello everybody,

I have problems with drawing in any method but [NSView -drawRect].

I placed the drawing code directly in the mouse event processing
handler, like this:

// This is a method of NSView subclass

- (void) mouseDragged:(NSEvent *) event
        NSPoint sketch_origin = ... ;

        [self lockFocus];

        // NSImage * _sketch, * _mask defined elsewhere

        [_sketch compositeToPoint: sketch_origin operation: NSCompositeCopy];

        [_mask compositeToPoint: sketch_origin 
                    operation: NSCompositeSourceOver];

        [self unlockFocus];

Nothing happens when the backing store is buffered or retained.
What do I miss?

Thank you,

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