How to combine CGRects with each other in Swift

Question

I was wondering if there was any way to combine a CGRect with another CGRect to get a new CGRect. Does swift have any preset functionality to do this or is there another way of achieving this?

Does this assume the rects are next to each other? What would be the algorithm/approach for "combining" two rectangles, in a general sense? — Craig Otis, May 29 '15 at 15:55
@CraigOtis yes exactly, two CGRects next to each other for example. I'm wondering if its possible to combine the two. — Zouvv, May 29 '15 at 15:56
@rmaddy CGRectUnion: "Returns the smallest rectangle that contains the two source rectangles." I don't think its the right one — Zouvv, May 29 '15 at 16:00
@Zouvv Clarify what you are actually looking for then because I think `CGRectUnion` is what you want. — rmaddy, May 29 '15 at 16:04
@rmaddy I quite simply have two CGRects that appear next to each other, then I want to combine them into one CGRect. but I will try that anyway, thanks — Zouvv, May 29 '15 at 16:17

score 18 · Answer 1 · edited Sep 29 '21 at 00:21

18

let rect1 = CGRect(x: 0, y: 0, width: 100, height: 100)
let rect2 = CGRect(x: 40, y: 40, width: 150, height: 150)
let union = rect1.union(rect2) // {x 0 y 0 w 190 h 190}

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edited Sep 29 '21 at 00:21

pkamb

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answered May 29 '15 at 16:02

Mikael Hellman

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score 11 · Answer 2 · answered Jun 30 '17 at 16:44

Swift 3 and newer:

let rect1 = CGRect(x: 0, y: 0, width: 100, height: 100)
let rect2 = CGRect(x: 40, y: 40, width: 150, height: 150)
let union = rect1.union(rect2) // {x 0 y 0 w 190 h 190}

Result is standardized, so resulting width and height are always positive:

let rect3 = CGRect(x: 0, y: 0, width: -100, height: -100)
let clone = rect3.union(rect3) // {x -100 y -100 w 100 h 100}

Documentation: https://developer.apple.com/documentation/coregraphics/cgrect/1455837-union

How to combine CGRects with each other in Swift

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