CODEWITHSUNDEEP
c#visual-studiounity-game-engine
ShulkTNT2
ShulkTNT2

Reputation: 11

How can you add a variable to a position in unity 2D?

I need help, I am coding an boss AI and I can't seem to add a variable to a position in unity.

Here is the code

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class FistScript : MonoBehaviour
{
    public GameObject player;
    public float offset;
    // Start is called before the first frame update
    void Start()
    {
        
    }

    // Update is called once per frame
    void Update()
    {
        transform.position.x = new Vector2(player.transform.position.x + offset, transform.position.y);
    }
}

When I use this I get this error:

'Assets\Scripts\FistScript.cs(18,9): error CS1612: Cannot modify the return value of 'Transform.position' because it is not a variable'

Please help if you can.

Upvotes: -1

Views: 1496

Answers (4)

Manuel Graça
Manuel Graça

Reputation: 11

You can't access transform.position.x directly because it belongs to position's Vector3 struct. I encourage you to better understand C# structs

 float x;
 float y;
 float z;

 void Move()
 {
   // THIS WORKS       
   transform.position = new Vector3(x,y,z);

   // THIS DOESN'T WORK
   transform.position = 23f;
   transform.position.x = 10f;
 }

Upvotes: 0

Vionix
Vionix

Reputation: 590

if you want to change only a single axis in transfrom.position, then you need to use a temp Vector2. Here is how to do it:

 Vector2 temp_pos=transform.position;
 temp_pos.x=player.transform.position.x + offset
 transform.position=temp_pos;

If You want to update the position directly, then you can just do this:

transform.position = new Vector2(player.transform.position.x + offset, transform.position.y);

Upvotes: 0

JottoWorol
JottoWorol

Reputation: 321

You're trying to assign Vector2 to float property. transform.position is a Vector2 struct with properties x and y. So you can't modify them because they are properties of a struct. To modify the position you should create a new Vector2 object.

player.transform.position = new Vector2(player.transform.position.x + offset, player.transform.position.y);

Simpler variant:

player.transform.position += Vector2.right * offset;

Upvotes: 1

Buhhovsky
Buhhovsky

Reputation: 101

In order to update position you can update transform.position, not the transform.position.x i.e

//update the position
    transform.position = transform.position + new Vector3(horizontalInput * movementSpeed * Time.deltaTime, verticalInput * movementSpeed * Time.deltaTime, 0);

For more information please refer to https://docs.unity3d.com/ScriptReference/Transform-position.html

Upvotes: 0

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