2D When rotating an object around a pivot, when mouse click, how do I prevent it from moving to the mouse position immediately?

Question

Hello Everyone,

In my game, I am rotating an object around a pivot. When my mouse move clockwise, the gameobject will also move clockwise.

However, when I mouse click and move, the object immediately move to the mouse position.

What I want is, when I mouse click and move, the object does not move immediately to the mouse position, and will move clockwise or anti-clockwise, from that spot.

This is the code,

using UnityEngine; using System.Collections;

public class playerController : MonoBehaviour {

 public Transform target; 
 public float fRadius = 3.0f;
 public float deltaAngle;
 public Vector3 startTransform;
 public Quaternion endRotation;
 public Vector3 touchPoint;
 public float ang;
 public float angleDifference;
 public Vector3 v;

void Update () {

     if (Input.GetMouseButtonUp(0))
     {
         endRotation.z = transform.eulerAngles.z;

     }
     if (Input.GetMouseButtonDown(0))
     {

         touchPoint = Camera.main.WorldToScreenPoint (target.position);
         touchPoint = Input.mousePosition - touchPoint;
         
         float dx = touchPoint.x - target.position.x;
         float dy = touchPoint.y - target.position.y;
         deltaAngle = Mathf.Atan2(dy,dx) * Mathf.Rad2Deg;;

         startTransform = transform.position;
     }

     if( (Input.GetAxis("Mouse X")<0) || (Input.GetAxis("Mouse X")>0) )
     {
         
         Vector3 pt = Camera.main.WorldToScreenPoint (target.position);
         pt = Input.mousePosition - pt;

         float dx = pt.x - target.position.x;
         float dy = pt.y - target.position.y;                
         ang = Mathf.Atan2(dy,dx) * Mathf.Rad2Deg;;

         angleDifference = deltaAngle - ang;

         transform.rotation = Quaternion.Euler (0,0,endRotation.z - angleDifference);


         v = Quaternion.AngleAxis (-angleDifference, Vector3.forward) * (Vector3.right * fRadius);
         transform.position = target.position - v;
     }

Answer 1

Okay, great news! I got it to work, after countless hours.

This is the code, for anyone who wants to do the same as me. ^.^

using UnityEngine; using System.Collections;

public class playerController : MonoBehaviour {

 public Transform target; 
 public float fRadius = 3.0f;

 public bool canStart;
 public bool canPlay;

 public float deltaAngle;
 public float startRotationZ;
 public Quaternion endRotation;
 Vector3 touchPoint;
 public float ang;
 public float angleDifference;
 public float lastAngledifference;
 public Vector3 v;
 private float dx;
 private float dy;
 private Vector3 pt;

 void Start ()
 {
     startRotationZ = transform.eulerAngles.z;
 }


 void Update () {

     if(Input.GetMouseButtonDown(0))
     {
         angleDifference = 0;
     }

     //Controls
     //If never touch, stop moving
     if (!Input.GetMouseButton(0))
     {
         canPlay = false;
     }

     //If touch, can move
     if (Input.GetMouseButton(0))
     {
         canPlay = true;
     }

     if (Input.GetMouseButtonUp(0))
     {
         endRotation.z = transform.eulerAngles.z;

         lastAngledifference = lastAngledifference + angleDifference;

     }

     //The rotation
     if (canPlay)
     {
         if ( (Input.GetMouseButtonDown(0))  )
         {
             //mouse position at start, and calculate angle
             touchPoint = Camera.main.WorldToScreenPoint (target.position);
             touchPoint = Input.mousePosition - touchPoint;

             deltaAngle = Mathf.Atan2(touchPoint.x,touchPoint.y) * Mathf.Rad2Deg;

         }

         if( ( (Input.GetAxis("Mouse X")<0) || (Input.GetAxis("Mouse X")>0) )  )
         {

             //mouse position when moving, and calculate angle
             pt = Camera.main.WorldToScreenPoint (target.position);
             pt = Input.mousePosition - pt;

             ang = Mathf.Atan2(pt.x,pt.y) * Mathf.Rad2Deg;

             angleDifference = deltaAngle - ang;

             v = Quaternion.AngleAxis (lastAngledifference + angleDifference, Vector3.forward) * (Vector3.right * fRadius);

             transform.position = target.position - v;

         }
     }
 }

}

2D When rotating an object around a pivot, when mouse click, how do I prevent it from moving to the mouse position immediately?

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