Does a given rect intersect a rotated view?

I have an NSView that is rotated using -setFrameRotation. (This is necessary because the view responds to mouse events, and you don't get correct behavior if you merely draw the view with a rotated NSAffineTransform.)

Given a rect in the rotated view's superview coordinates, how can I determine what portion of the rect intersects the rotated view's frame?

Use case: the Cocoa text system proposes to draw text in a line fragment rectangle. I need to determine how much of that rectangle may开发者_如何转开发 be filled with text without overlapping the rotated view.

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Take the point, use an affine transform to rotate into the coordinate system of the bounds of the rect and then rect-test that.