Mouse cursor position relative to the object

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I can not figure out the way to calculate how the mouse cursor corresponds with the object center in 2D sceen plane. To be more clear, I need to calculate if the cursor is more to the left or to the right relatively to the center of the object.

Answer 1

Best Answer

Answer by Positive7 · Jul 28, 2015 at 03:31 PM

 using UnityEngine;
 
 public class test3 : MonoBehaviour
 {
     void Update(){
 
         Vector2 mouse = new Vector2(Input.mousePosition.x,Input.mousePosition.y);
         Ray ray;
         ray = Camera.main.ScreenPointToRay(mouse);
         RaycastHit hit;
         
         if(Physics.Raycast(ray,out hit, 10))
         {
             if(hit.point.x < transform.position.x)
                 Debug.Log("Left");
             else
                 Debug.Log("Right");
         }
     }
 }

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mrnuke · Jul 29, 2015 at 02:17 PM 0

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That worked! Thanks a lot!

TharosTheDragon · Oct 08, 2017 at 03:35 AM 0

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What if it's on a UI canvas?

Positive7 TharosTheDragon · Oct 08, 2017 at 03:51 PM 0

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Something like this should work on UI :

  private void Update()
     {
         var pointer = new PointerEventData(EventSystem.current) { position = Input.mousePosition };
         var raycastResults = new List<RaycastResult>();
         EventSystem.current.RaycastAll(pointer, raycastResults);
 
         if (raycastResults.Count > 0)
         {
             foreach (var raycastResult in raycastResults)
             {
                 if (EventSystem.current.IsPointerOverGameObject() && raycastResult.gameObject.name == "Button")
                 {
                     Debug.Log(Input.mousePosition.x < raycastResult.gameObject.transform.position.x ? raycastResult.gameObject.name + " Left" : raycastResult.gameObject.name + " Right");
                 }
             }
         }
     }

$$anonymous$$aybe there is a more efficient way tho.

TharosTheDragon Positive7 · Oct 08, 2017 at 04:14 PM 0

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Good idea, but it turns out RectTransformUtility is the way to go.

Answer 2

Answer by lightgem12 · Oct 18, 2015 at 09:13 AM

Well, this is what I did to find the distance between them for x and y:

     public Camera camera;
 public Transform obj;

 Vector2 objPos;
 Vector2 mousePos;
 float mousePosY, mousePosX;
  
 void Update () 
 {
     objPos = obj.transform.position;//gets player position
     mousePos = Input.mousePosition;//gets mouse postion
     mousePos = camera.ScreenToWorldPoint (mousePos);
     mousePosX = mousePos.x - objPos.x;//gets the distance between object and mouse position for x
     mousePosY = mousePos.y - objPos.y;//gets the distance between object and mouse position for y  if you want this.

     
 }

you wont need the y for this situation, but I thought I might as well show that too. I'm not going to tell you how to implement it into an if statement, I'm sure you can handle it. Hope this helps, and works.

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Mouse cursor position relative to the object

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