I just stumbled over this issue with CGRectUnion when one operand is
an empty rect, or has negative width or hight:
CGRect r1 = CGRectZero;
CGRect r2 = CGRectMake(100.0, 100.0, 300.0, 300.0);
CGRect r3 = CGRectUnion(r1, r2);
the result for r3 is actually :
r3.origin: (0, 0)
r3.size: (300, 300)
However, according the docs:
"if one of the rectangles has 0 (or negative) width or height, a copy
of the other rectangle is returned; "
which should yield:
r3.origin: (100, 100)
r3.size: (300, 300)
If the width or height of rectangle r1 has negative values, it too
merges the two extents. So it seems, an empty rect or an "invalid"
rect (negative width or height) contributes to the resulting extent.
I'm wondering if this is intended behavior and the docs are wrong, or
vice versa.
Regards
Andreas
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