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Question by Major_Lag · Jan 17, 2020 at 01:21 AM · 2drotationscripting problemmovementquaternion

Help with rotating a sprite with mouse.

I made a script that should allow the player be able to move and rotate sprites with left and right click. It does work, however, I don't like the way it snaps to face the mouse. alt textI want pretty much to be able to grab the object and rotate by spinning around it. What ways should i try to get this interaction? I've tried a few different ways to fix this but haven't been able to understand how to make it work. Here's my code:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class Interactable : MonoBehaviour
 {
     float startPosX;
     float startPosY;
 
     bool isBeingDragged = false;
     bool isBeingRotated = false;
 
     // Update is called once per frame
     void Update()
     {
         if (Input.GetMouseButtonUp(0))
         {
             Debug.Log("left click up");
             isBeingDragged = false;
         }
         if (Input.GetMouseButtonUp(1))
         {
             Debug.Log("right click up");
             isBeingRotated = false;
         }
         if (isBeingDragged)
         {
             Vector3 mousePos = Camera.main.ScreenToWorldPoint(Input.mousePosition);
             transform.localPosition = new Vector3(mousePos.x - startPosX, mousePos.y - startPosY, 0);
         }
         else if (isBeingRotated) //if youre already being dragged you shouldnt be able to rotate.
         {
             Vector3 mousePos = Camera.main.ScreenToWorldPoint(Input.mousePosition);
             transform.rotation = Quaternion.LookRotation(Vector3.forward, mousePos - transform.position);
         }
     }
 
     private void OnMouseOver()
     {
         
         if (Input.GetMouseButtonDown(0))
         {
             //Debug.Log("got left click");
 
             Vector3 mousePos = Camera.main.ScreenToWorldPoint(Input.mousePosition);
             startPosX = mousePos.x - this.transform.localPosition.x;
             startPosY = mousePos.y - this.transform.localPosition.y;
 
             isBeingDragged = true;
         }
 
         if (Input.GetMouseButtonDown(1))
         {
             //Debug.Log("got right click");
 
             isBeingRotated = true;
         }
     }
 }

Let me know your thoughts/improvements for any part of my script.

rotate1.gif (511.2 kB)
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Answer by logicandchaos · Jan 18, 2020 at 02:23 AM

if you want to rotate at the point you click on you might have to set the pivot point to the mouse click location on object.

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avatar image Major_Lag · Jan 18, 2020 at 02:51 AM 0
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No i think you misunderstand. I want to be able to basically grab the object and rotate by spinning around it you see?

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Answer by Major_Lag · Jan 19, 2020 at 06:53 AM

I made a bodge that works for me currently however Its not really future proof like for oblong objects.

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class Interactable : MonoBehaviour
 {
     float startPosX;
     float startPosY;
 
     bool isBeingDragged = false;
     bool isBeingRotated = false;
 
     // Update is called once per frame
     void Update()
     {
         if (Input.GetMouseButtonUp(0))
         {
             Debug.Log("left click up");
             isBeingDragged = false;
         }
         if (Input.GetMouseButtonUp(1))
         {
             Debug.Log("right click up");
             isBeingRotated = false;
         }
         if (isBeingDragged)
         {
             Vector3 mousePos = Camera.main.ScreenToWorldPoint(Input.mousePosition);
             transform.localPosition = new Vector3(mousePos.x - startPosX, mousePos.y - startPosY, 0);
         }
         else if (isBeingRotated) //if youre already being dragged you shouldnt be able to rotate.
         {
             Vector3 mousePos = Camera.main.ScreenToWorldPoint(Input.mousePosition);
             Vector3 dir = mousePos - transform.position;
             float angle = Mathf.Atan2(dir.y, dir.x) * Mathf.Rad2Deg;
             transform.rotation = Quaternion.AngleAxis(angle, Vector3.forward);
         }
     }
 
     private void OnMouseOver()
     {
         
         if (Input.GetMouseButtonDown(0))
         {
             Vector3 mousePos = Camera.main.ScreenToWorldPoint(Input.mousePosition);
             startPosX = mousePos.x - this.transform.localPosition.x;
             startPosY = mousePos.y - this.transform.localPosition.y;
 
             isBeingDragged = true;
         }
 
         if (Input.GetMouseButtonDown(1))
         {
             isBeingRotated = true;
         }
     }
 }
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