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Detecting a UI element is over another UI element

Discussion in 'UGUI & TextMesh Pro' started by jtsmith1287, Dec 8, 2014.

  1. jtsmith1287

    jtsmith1287

    Joined:
    Aug 3, 2014
    Posts:
    787
    I have an icon that's controlled by the player and the camera is parented to it. The icon moves over a map and if the icon is over a particular region/point I want to interact with it. I've googled a little bit and pondered on it for a few days while working on other stuff but haven't thought of a what I feel is a reasonable way of handling this.

    I'm essentially curious if there's a way of doing this *without* adding a 2D collider to my UI elements, since this forces me to also put 2D rigidbodies on them. It just seems over kill. If it isn't going to be a hit on memory or performance than I'll go ahead and do it with ray casting and 2 colliders.
     
    jtsmith1287, Dec 8, 2014
    #1

  2. rakkarage

    rakkarage

    Joined:
    Feb 3, 2014
    Posts:
    683
    maybe RectTransformUtility.RectangleContainsScreenPoint or something in there?
     
    rakkarage, Dec 9, 2014
    #2

  3. CaoMengde777

    CaoMengde777

    Joined:
    Nov 5, 2013
    Posts:
    813
    did you figure this out?? i cant find a way to do so..

    i even did try 2d rigidbody and 2d collider, and it doesnt work on UI elements???
     
    CaoMengde777, Dec 12, 2014
    #3

  4. Tim-C

    Tim-C

    Unity Technologies

    Joined:
    Feb 6, 2010
    Posts:
    2,181
    If you do:

    EventSystem.current.RaycastAll it will return a list of raycast results sorted into the hit order. So you will get a list of all things under the point :)
     
    Tim-C, Dec 12, 2014
    #4
    rakkarage likes this.

  5. jtsmith1287

    jtsmith1287

    Joined:
    Aug 3, 2014
    Posts:
    787
    Does that work with UI elements, or will a rigidbody/collider need to be attached?
     
    jtsmith1287, Dec 12, 2014
    #5

  6. Kiwasi

    Kiwasi

    Joined:
    Dec 5, 2013
    Posts:
    16,860
    This will work on anything that has an appropriate raycaster in the scene. So on UI elements as long as you have a graphics raycaster (normally on the canvas). And colliders as long as you have a physics raycaster (usually on the camera).
     
    Kiwasi, Dec 13, 2014
    #6