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Question by unin · Feb 17, 2015 at 12:04 PM · c#guirelative position

How do I relate the position of a Gui Rec Transform to a gameobject?

I'm trying to create a GUI button that when dragged causes a game-object in the scene to move relative to the GUI's movement. Here's my code:

 using UnityEngine;
 using UnityEngine.EventSystems;
 using System.Collections;
 
 
 public class DragController: MonoBehaviour, IBeginDragHandler, IDragHandler, IEndDragHandler 
 {
     public static GameObject guiBeingDragged;
     public GameObject gameObjectBeingDragged;
     private Vector3 guiStartPosition, gameObjectStartPosition;
     private Transform myTransform;
 
     void Start()
     {
         myTransform = transform;
     }
 
 
     public void OnBeginDrag(PointerEventData eventData)
     {
         guiBeingDragged = gameObject;
         guiStartPosition = myTransform.position;
         gameObjectStartPosition = gameObjectBeingDragged.transform.position;
     }
 
     public void OnDrag(PointerEventData eventData)
     {
         myTransform.position = Input.mousePosition;
         DefineObjectPosition();
     }
 
     public void OnEndDrag(PointerEventData eventData)
     {
        //## this part resets their position to start
         guiBeingDragged = null;
         myTransform.position = guiStartPosition;
         gameObjectBeingDragged.transform.position = gameObjectStartPosition;
     }
 
     void DefineObjectPosition()
     {
         /* The math behind this part is: 
         (Gui Current Position)*(GameObject Start Position) / (GUI Start Position) = (GameObject Current Position)*/
         gameObjectBeingDragged.transform.position = 
             new Vector3((myTransform.position.x * gameObjectStartPosition.x) / guiStartPosition.x,
                 ((myTransform.position.y * gameObjectStartPosition.y) / guiStartPosition.y));
     }
 }




It works on the y axis as expected, but it doesn't move at all on the x. My assumption is that I'm not properly relating their position so I'm not receiving the results I want. So my question is how do I relate the position of a Gui Rec Transform to a game-object?

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Answer by unin · Feb 19, 2015 at 07:09 PM

Alright, I figured out why I was having trouble. There are 2 problems with the current code. The first is that the position of the GUI-object is in screen space. This can be resolved by converting its position to a world point by using:

 Camera.main.ScreenToWorldPoint();

The 2nd problem is how I was calculating the position of the game-object. If the game-object/GUI object start position contained a zero, it would have lead to 'NaN' problems. So instead of relating there position through division, I subtracted the GUI's current position from it's start and added that to the game objects start position like so:

 /*convertedPosition and ConvertedStartPosition are Vector3
 values of the Gui's start and current position 
 converted using the technique mentioned above.*/
         
 Vector3 distance = convertedPosition - convertedStartPosition;
 gameObjectBeingDragged.transform.position = 
 new Vector3(gameObjectStartPosition.x + distance.x, gameObjectStartPosition.y + distance.y);


Now the game-object moves as predicted and the headache this problem caused me is gone. :)

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