How do I tie my movement script to only selected objects?,How do I tie my movement script to the my selection script?

Question

I'm trying to make the player only move the selected item and not all at once. Right now I have a movement script that looks like this:

  void Update()
     {
         if (Input.GetKey(KeyCode.A))
             transform.Rotate(-Vector3.forward * RotateSpeed * Time.deltaTime);
         else if (Input.GetKey(KeyCode.D))
             transform.Rotate(Vector3.forward * RotateSpeed * Time.deltaTime);
     }

And a selection script that looks like this:

 void MouseInput()
     {
         // When Mouse 0 is pressed
         if (Input.GetMouseButton(0))
         {
             // Raycast from camera to mouse position
             Vector2 raycastPos = Camera.main.ScreenToWorldPoint(Input.mousePosition);
             RaycastHit2D hit = Physics2D.Raycast(raycastPos, Vector2.zero);
 
             // If a collider is hit
             if (hit.collider != null)
             {
                 // Log the name of the hit object
                  Debug.Log(hit.collider.gameObject.name);
                 
             }
 
            if (hit.collider.gameObject.name != null)
             {
                 Debug.Log("Im called " + hit.collider.gameObject.name + " and I'm hit and should move");
             }
            
 
         }

Unity does know when something is selected or "hit" and I have my movement script on all the game objects that need movement right now.

Answer 1

Best Answer

Answer by HellsHand · Apr 13, 2021 at 04:06 PM

Here try this in 1 script on the objects you want the player to move:

 using UnityEngine;
 using UnityEngine.EventSystems;
 
 public class RotateObject : MonoBehaviour, ISelectHandler, IDeselectHandler
 {
     bool selected = false;
     void Update()
     {
         if (selected)
         {
             if (Input.GetKey(KeyCode.A))
                 transform.Rotate(-Vector3.forward * RotateSpeed* Time.deltaTime);
             else if (Input.GetKey(KeyCode.D))
                 transform.Rotate(Vector3.forward * RotateSpeed* Time.deltaTime);
         }
     }
 
     private void OnMouseDown()
     {
         if (Input.GetMouseButtonDown(0))
         {
             EventSystem.current.SetSelectedGameObject(gameObject);
         }
     }
 
     public void OnSelect(BaseEventData eventData)
     {
         selected = true;
     }
 
     public void OnDeselect(BaseEventData eventData)
     {
         selected = false;
     }
 }

Unless I'm misunderstanding your problem that should work.

Add comment · Show 1 · Share

snainner · Apr 15, 2021 at 12:20 PM 0

Share

It looks like it would be solve my issue but I'm having a bit of a problem with using it because I am getting this error: Object reference not set to an instance of an object selected.Update () (at Assets/selected.cs:14) And I'm not sure how to fix it. My selected script looks like this:

   void Update()
     {
         {
             if (EventSystem.current.currentSelectedGameObject)
             {
                 if (Input.GetKey(KeyCode.A))
                     transform.Rotate(-Vector3.forward * RotateSpeed * Time.deltaTime);
                 else if (Input.GetKey(KeyCode.D))
                     transform.Rotate(Vector3.forward * RotateSpeed * Time.deltaTime);
             }
         }
     }
 
     private void OnMouseDown()
     {
         if (Input.GetMouseButtonDown(0))
         {
             EventSystem.current.SetSelectedGameObject(gameObject);
         }
     }
 
 
 }

Edit: So I think I need to let unity know that the item is also selected in the event system but I'm having a syntax error right now trying to do that and I don't know how to fix that.

  // If a collider is hit
             if (hit.collider != null)
             {
                 // Log the name of the hit object
                 Debug.Log(hit.collider.gameObject.name);
                 EventSystem.SetSelectedGameObject(1Hole); 
 
             }

With the syntax error being: Assets\selection.cs(31,52): error CS1003: Syntax error, ',' expected

How do I tie my movement script to only selected objects?,How do I tie my movement script to the my selection script?

1 Reply

Your answer

Follow this Question

Related Questions