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Rotate object 2d

Discussion in 'Scripting' started by thomaesjohansen, Aug 9, 2019.

  1. thomaesjohansen

    thomaesjohansen

    Joined:
    Aug 9, 2019
    Posts:
    6
    Hello,
    When I try to rotate this wheel if I click on partition 3, partition 1 automatically goes instead of 3 and then rotates as I want. Basically I would like to stay 3 under the cursor.
    Partition 3 was like an example. I need that no matter where I click the rotation starts from there.
    Any help, please?
    Sorry for my bad english. :(

    My code:

    Code (CSharp):
    1. using System.Collections;
    2. using System.Collections.Generic;
    3. using UnityEngine;
    4.  
    5. public class rotate : MonoBehaviour
    6. {
    7.     private void OnMouseDrag()
    8.     {
    9.         Vector3 mouse_pos = Input.mousePosition;
    10.         Vector3 wheel_pos = Camera.main.WorldToScreenPoint(this.transform.position);
    11.  
    12.         mouse_pos.x = mouse_pos.x - wheel_pos.x;
    13.         mouse_pos.y = mouse_pos.y - wheel_pos.y;
    14.  
    15.         float angle = Mathf.Atan2 (mouse_pos.y, mouse_pos.x) * Mathf.Rad2Deg;
    16.         this.transform.rotation = Quaternion.Euler (new Vector3(0, 0, angle));
    17.     }
    18. }
    UNITYprintscreen.jpg

    Edit:
     
    Last edited: Aug 9, 2019
  2. FMark92

    FMark92

    Joined:
    May 18, 2017
    Posts:
    1,222
    If it's exactly the opposite direction, try just rotating by angle+180° instead of just angle.
     
  3. thomaesjohansen

    thomaesjohansen

    Joined:
    Aug 9, 2019
    Posts:
    6
    Hello,
    Thanks for the reply.
    Partition 3 was like an example. I need that no matter where I click the rotation starts from there.
     
  4. FMark92

    FMark92

    Joined:
    May 18, 2017
    Posts:
    1,222
    Have you tried solution which I proposed?
     
  5. thomaesjohansen

    thomaesjohansen

    Joined:
    Aug 9, 2019
    Posts:
    6
    Yes, I tried but it didn't solve my problem.
    In attach is a simulation for the first situation.
    If I put "angle + 180 °" instead of partition 1 is partition 3, but it's still not what I need.
    Thanks anyway.
     

    Attached Files:

  6. FMark92

    FMark92

    Joined:
    May 18, 2017
    Posts:
    1,222
    Ah. I see. You are just setting angle. Try getting angle on mouse click and then put the difference between angles into the rotation function.
    Code (CSharp):
    1. this.transform.rotation = Quaternion.Euler (new Vector3(0, 0, Mathf.Abs(angle_at_press - angle_at_release)));
     
  7. thomaesjohansen

    thomaesjohansen

    Joined:
    Aug 9, 2019
    Posts:
    6
    Hi!
    For angle on mouse click:
    Code (CSharp):
    1. Vector3 angle_at_press = Camera.main.WorldToScreenPoint(Input.mousePosition);
    but how can I determine "angle_at_release"?
     
  8. FMark92

    FMark92

    Joined:
    May 18, 2017
    Posts:
    1,222
    Oh, sorry. For you that is angle during drag. So you can reuse most of the stuff from your first post.

    Code (CSharp):
    1. private void OnMouseDrag()
    2.     {
    3.         Vector3 mouse_pos = Input.mousePosition;
    4.         Vector3 wheel_pos = Camera.main.WorldToScreenPoint(this.transform.position);
    5.         mouse_pos.x = mouse_pos.x - wheel_pos.x;
    6.         mouse_pos.y = mouse_pos.y - wheel_pos.y;
    7.         float angle = Mathf.Atan2 (mouse_pos.y, mouse_pos.x) * Mathf.Rad2Deg;
    8.         this.transform.rotation = Quaternion.Euler (new Vector3(0, 0, Math.abs(angle - (Mathf.Atan2 (angle_at_press.y, angle_at_press.x) * Mathf.Rad2Deg))));
    9.     }
     
    thomaesjohansen likes this.
  9. thomaesjohansen

    thomaesjohansen

    Joined:
    Aug 9, 2019
    Posts:
    6
    I have tried now but I get this error:
    The name `angle_at_press' does not exist in the current context.
     
  10. FMark92

    FMark92

    Joined:
    May 18, 2017
    Posts:
    1,222
    You need to declare in context and assign it on mouse press. It won't exist otherwise.

    Code (CSharp):
    1.  
    2. Vector3 angle_at_press;
    3.  
    4. void Update ()
    5.  {
    6.  
    7.     if (Input.GetMouseButtonDown(0))
    8.     {
    9.         angle_at_press = Camera.main.WorldToScreenPoint(Input.mousePosition);
    10.     }
    11. }
    12.  
    13. private void OnMouseDrag()
    14.     {
    15.         Vector3 mouse_pos = Input.mousePosition;
    16.         Vector3 wheel_pos = Camera.main.WorldToScreenPoint(this.transform.position);
    17.         mouse_pos.x = mouse_pos.x - wheel_pos.x;
    18.         mouse_pos.y = mouse_pos.y - wheel_pos.y;
    19.         float angle = Mathf.Atan2 (mouse_pos.y, mouse_pos.x) * Mathf.Rad2Deg;
    20.         this.transform.rotation = Quaternion.Euler (new Vector3(0, 0, Math.abs(angle - (Mathf.Atan2 (angle_at_press.y, angle_at_press.x) * Mathf.Rad2Deg))));
    21.     }
     
  11. thomaesjohansen

    thomaesjohansen

    Joined:
    Aug 9, 2019
    Posts:
    6
    Thank you very much for the answer.
    Neither this script doesn't work as I wanted.
    I think I'll give up with that. I'm a beginner and I should probably start with some easier things.
    Thanks again for your help and for your time. :)