Error when using GUITexture.HitTest

Question

Hi

I'm trying to use GUI.Texture.HitTest(touch.position) to get the true or false bool when user touches the mobile screen. I get the following error message: "BCE0019: 'Hit Test' is not a member of UnityEngine.GameObject."

Here's my code:

    var GUI_LeftArrow : GameObject;
     var GUI_RightArrow : GameObject;
     
     function Awake() {
         GUI_LeftArrow = GameObject.Find("GUI_LeftArrow");
         GUI_RightArrow = GameObject.Find("GUI_RightArrow");
     }
     
     function Update() {
         for (var touch : Touch in Input.touches) {
             if (touch.phase == TouchPhase.Stationary && GUI_LeftArrow.HitTest(touch.position)) {
             Debug.Log("Left Arrow Down");
             }
         
         }
     }

GameObject.Find is getting the GUITexture (Game Object) from the hierarchy panel in Unity. Maybe I'm missing an import into the script at the top? Any help will be great.

Answer 1

Answer by aldonaletto · Oct 03, 2013 at 03:44 AM

Unity is right! HitTest is member of GUITexture, not of GameObject - you should use the guiTexture property of GUI_LeftArrow instead:

 if (... && GUI_LeftArrow.guiTexture.HitTest(touch.position)){

NOTE: never use Find inside Awake - the objects you're looking for may have not been created yet. Rename the function Awake as Start and potential headaches will be avoided.

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r-dotfunky · Oct 03, 2013 at 03:57 AM 0

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Removed my incorrect answer - apologies!

tw1st3d · Oct 03, 2013 at 04:08 AM 0

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Good tip on the Start ins$$anonymous$$d of Awake usage.

Answer 2

Answer by TrickyHandz · Oct 03, 2013 at 04:02 AM

GameObject doesn't have a HitTest...but GUITexture does. So, you need to declare your variables a GUITexture not GameObject. Then you need to get the guiTexture property of the GameObject found in the Start Function as a GUITexture. Give this a try:

 var GUI_LeftArrow : GUITexture;
 var GUI_RightArrow : GUITexture;
  
 function Start() {
     GUI_LeftArrow = GameObject.Find("GUI_LeftArrow").guiTexture;
     GUI_RightArrow = GameObject.Find("GUI_RightArrow").guiTexture;
 }
  
 function Update() 
 {
     for (var touch : Touch in Input.touches) 
     {
        if (touch.phase == TouchPhase.Stationary && GUI_LeftArrow.HitTest(touch.position)) 
        {
            Debug.Log("Left Arrow Down");
        }
  
     }
 }

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Rick.Miranda · Oct 03, 2013 at 10:35 PM 0

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Thank you so much TrickyHandz. This is the solution. Appreciate your help. :-)

TrickyHandz · Oct 03, 2013 at 10:37 PM 0

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No problem. Just mark the answer as accepted when you have a chance. Happy coding!

Rick.Miranda · Oct 03, 2013 at 10:42 PM 1

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Sure, I'd love to do that. Just not sure where or if I have to have reputation points to be able to upvote or mark as accepted...let me know.

Answer 3

Answer by Rick.Miranda · Oct 03, 2013 at 10:41 PM

Final Working Solution for detecting GUITexture touch events:

 var GUI_LeftArrow : GUITexture;
 var GUI_RightArrow : GUITexture;
 
 function Start() {
     GUI_LeftArrow = GameObject.Find("GUI_LeftArrow").guiTexture;
     GUI_RightArrow = GameObject.Find("GUI_RightArrow").guiTexture;
 }
 
 function Update() {
     for (var touch : Touch in Input.touches) {
         if (touch.phase == TouchPhase.Stationary && GUI_LeftArrow.HitTest(touch.position)) {
         //if (touch.phase == TouchPhase.Stationary) {
         //if (GUI_LeftArrow.HitTest(touch.position)) {
         Debug.Log("Left Arrow Down");
         }
     
     }
 }

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Error when using GUITexture.HitTest

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