Rotate and proportionally scale a vector

A pani od matematyki nie uczyła jak liczyć miejsce zerowe funkcji, hm?

 using UnityEngine;
 public class MiejsceZeroweFunkcjiLiniowej : MonoBehaviour
 {
     [SerializeField] Vector2 _In = Vector2.one;
     [SerializeField] float _InRotation = 0;// degrees
     [SerializeField] Vector2 _Out;
     [SerializeField] float _yCutoff = 1.5f;
     void OnValidate ()
     {
         float inVecAngle = Mathf.Atan2( _In.y , _In.x );// radians
         float inVecAngleRotated = inVecAngle + Mathf.Deg2Rad*_InRotation;// radians
         Vector2 inVecRotated = new Vector2{ x=Mathf.Cos(inVecAngleRotated) , y=Mathf.Sin(inVecAngleRotated) };// unit vector, for simplicity
         float fx = inVecRotated.y / inVecRotated.x;// f(x) = (vec.y/vec.x)*x + 0
         float fy = inVecRotated.x / inVecRotated.y;// f(y) = (vec.x/vec.y)*y + 0
         _Out = new Vector2{ x=fy*_yCutoff , y=_yCutoff };
     }
     void OnDrawGizmos ()
     {
         Gizmos.color = Color.yellow; Gizmos.DrawLine( new Vector3{x=-10,y=_yCutoff} , new Vector3{x=+10,y=_yCutoff} );
         Gizmos.color = Color.w$$anonymous$$te; Gizmos.DrawRay( Vector3.zero , _In );
         Gizmos.color = Color.red; Gizmos.DrawRay( Vector3.zero , _Out );
     }
 }