Thanks everyone for answers. Now situation is more clear. On Wed, Jun 30, 2010 at 12:14 PM, Alastair Houghton <alast...@alastairs-place.net> wrote: > > fabs is the right way to do this in most cases, *but* with co-ordinate values > it may be that you are actually more interested in the distance of one point > from the other---i.e. you might in fact be interested in > > CGFloat dx = C.x - D.x, dy = C.y - D.y; > BOOL pointsAreEqual = (dx * dx + dy * dy) < epsilonSquared; > > It rather depends on what you want, and that's going to differ from one > application to another.
In my case I am interested in x's and y's comparison. Not points as themselves. But your suggestion gave me another question, which I have never thought about before - how NSEqualPoints, ...Rects etc works? I guess they *must* be safe to use, because NSPoint, NSRect etc relies on floats/doubles. Or they uses the same '==' and are TRUE only if points/rects are *really* equal? Best Regards, Rimas M. _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
