I am having trouble understanding how Core Animation
geometry interacts with NSView geometry in a
layer-hosting situation.
I have an NSView that hosts a root layer, and it has
two sublayers that I need the user to be able to drag
each around. I want to be able to convert a mouse
coordinate into a point suitable for -hitTest:'ing on
my root layer. I can convert from the mouse
coordinates to the view's coordinates, but then I am
not sure how to proceed. The convertPoint:fromView:
method of NSView translates into the bounds rectangle,
which is distinct from the view's frame. CALayers
don't have this bounds/frame distinction, and I'm not
sure whether the view's *frame* or it's *bounds* get
applied to the hosted layer.
I looked at how GeekGameBoard does it:
CGPoint where = NSPointToCGPoint([self
convertPoint: locationInWindow fromView: nil]);
where = [_gameboard convertPoint: where fromLayer:
self.layer];
CALayer *layer = [_gameboard hitTest: where];
...which is straightforward enough BUT when I use
Quartz Debug to double the scale factor, GeekGameBoard
breaks, as if mouse movements/locations were halved.
How do I convert points between these coordinate
spaces in a more savvy manner?
I think I get Core Animation's geometry within Core
Animation, but I still don't get how it relates to the
device and NSView geometry. Given the huge textures
Core Animation wants to make when I create sublayers
on a layer with a shrinking transform, it almost seems
that 1 unit always corresponds to 1 pixel. How does
Core Animation's geometry relate to NSView's
resolution independent geometry?
thanks,
-natevw
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