Question by Calfa · Dec 15, 2018 at 11:32 PM · rotation transform child

Please help with transform child rotation

I have seen and read a few similar questions in this forum, but i didn't find exactly what i was looking for.

Here is my issue:

I'm trying to make a 2D game similar to Worms. My player uses a line to help aiming which can be rotated from 0 (horizontal) to 90 degrees (vertical). When player faces to the right, it will go from 0º to 90º and when facing to the left it will go from 90º to 180º.

Since i don't understand the concept of Quaternion and how to work with it, i'm trying to do the whole thing using eulerAngles.

This is what i came up with:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class PlayerControl : MonoBehaviour {
 
     public float rotationSpeed = 25f;
     public float movementSpeed = 2f;
     // Use this for initialization
     void Start () {
         
     }

     void Update () {
         this.ControlPlayer();
         this.AimControl();
         
     }
     void ControlPlayer(){
         Vector3 p = transform.position;
         var y = transform.eulerAngles.y;
         //Prevent player from moving on the Z axis
         if(p.z != 0){
             p.z = 0;
         }
         transform.position = p;
             //Player movement
         var x = Input.GetAxis("Horizontal") * Time.deltaTime * movementSpeed;
             //Set the direction player is facing
         if(x < 0){
             y = 0;
         }else if(x > 0){
             x = -x;
             y = 180;
         }
         transform.eulerAngles = new Vector3(0,y,0);
         transform.Translate(x, 0, 0);
     }
     void AimControl(){
             //Child is an empty GO attached to player containing the aiming line
         var child = transform.GetChild(0);
         var z = Input.GetAxis("Vertical") * Time.deltaTime * rotationSpeed;
         var rot = new Vector3(0,0,z);

         //Limit Aim Line rotation to values between 0 and 90.
         var minRot = new Vector3(0,0,0);
         var maxRot = new Vector3(0,0,90);
         child.Rotate(rot, Space.World);

         if(child.eulerAngles.z < 0){
             if(child.eulerAngles.z > -90){
                 child.eulerAngles = minRot;
             }else{
                 child.eulerAngles = maxRot;
             }
         }else if(child.eulerAngles.z > 90){
             //child.eulerAngles = maxRot;
         }
     }
 }

My problem is in "AimControl()". I just want it not to go below 0º and above 90º regardless which side player is facing at. I've tried many modifications on the last if/else part. I've also tried to rotate it local and world but i don't really know what i'm doing and can't see any satisfying results.

Hope you guys can help me understand it better. Thanks in advance!

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