2D Mouse Aiming

How can I achieve mouse aiming in unity?

 

You can find the angle between your mouse position and character:

Code (csharp):

1.  
2. public static float SignedAngle(Vector2 a, Vector2 b)
3. {
4. Vector3 a3 = (Vector3)a;
5. Vector3 b3 = (Vector3)b;
6. var angle = Vector3.Angle(a3, b3);
7. return angle * Mathf.Sign(Vector3.Cross(a3, b3).z);
8. }
9.  

and then rotate your GO around the Z axis like so:

Code (csharp):

1.  
2. float angle = SignedAngle(dir, new Vector3(0,1));
3. Quaternion lookDir = Quaternion.AngleAxis(angle, new Vector3(0,0,-1));
4. transform.localRotation = lookDir;
5.