Performs hit-testing on this AnnPointObject.
The LeadPointD to be tested.
The threshold buffer value, in pixels.
true if the test point intersects with the object; otherwise, false.
The point should be in physical coordinates.
The hitTestBuffer is used to make the test point "bigger" to compensate for errors and provide smoother hit-testing. For example, if buffer is 2, a square with a length of 4 pixels around testPoint will be used to perform the hit-testing.
By default, an annotation object will return true if hit-testing was satisfied. Derived objects can override this method to fine-tune the return value.
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