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Question by theleonn · Dec 19, 2016 at 08:52 PM · 2drotate objectclamped rotationz axis

Limit rotation of z axis of a 2d object which rotates with mouse click and drag

I have the following script which rotates a 2d object z axis with mouse click and drag, but want to limitate the rotation between 0 and -160...

 using UnityEngine;
 using System.Collections;
 
 public class ButtonController3 : MonoBehaviour {
 
     private Camera myCam;
     private Vector3 screenPos;
     private float angleOffset;
 
 
     void Start () {
         myCam = Camera.main;
     }
 
     void Update () {
         //This fires only on the frame the button is clicked
         if (Input.GetMouseButtonDown (0)) {
             screenPos = myCam.WorldToScreenPoint (transform.position);
             Vector3 v3 = Input.mousePosition - screenPos;
             angleOffset = (Mathf.Atan2 (transform.right.y, transform.right.x) - Mathf.Atan2 (v3.y, v3.x)) * Mathf.Rad2Deg;
         }
 
         //This fires while the button is pressed down
         if (Input.GetMouseButton (0)) {
             Vector3 v3 = Input.mousePosition - screenPos;
             float angle = Mathf.Atan2 (v3.y, v3.x) * Mathf.Rad2Deg;
             transform.eulerAngles = new Vector3 (0, 0, angle + angleOffset);
 
         }
     }
 }
 
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Answer by acharyashri · Jul 12, 2018 at 03:22 PM

@theleonn just add a check for value of (angle + angleOffset) before applying the rotation.

 using UnityEngine;
  using System.Collections;
  
  public class ButtonController3 : MonoBehaviour {
  
      private Camera myCam;
      private Vector3 screenPos;
      private float angleOffset;
  
  
      void Start () {
          myCam = Camera.main;
      }
  
      void Update () {
          //This fires only on the frame the button is clicked
          if (Input.GetMouseButtonDown (0)) {
              screenPos = myCam.WorldToScreenPoint (transform.position);
              Vector3 v3 = Input.mousePosition - screenPos;
              angleOffset = (Mathf.Atan2 (transform.right.y, transform.right.x) - Mathf.Atan2 (v3.y, v3.x)) * Mathf.Rad2Deg;
          }
  
          //This fires while the button is pressed down
          if (Input.GetMouseButton (0)) {
              Vector3 v3 = Input.mousePosition - screenPos;
              float angle = Mathf.Atan2 (v3.y, v3.x) * Mathf.Rad2Deg;
 
 
    float newAngle = angle + angleOffset;
 
             
             if (newAngle < 0f && newAngle > -160f)
             {
 
                   transform.eulerAngles = new Vector3(0, 0, angle + angleOffset);
 
             }
          }
      }
  } 
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