Version: 2023.1
LanguageEnglish
  • C#

Vector2.SignedAngle

Suggest a change

Success!

Thank you for helping us improve the quality of Unity Documentation. Although we cannot accept all submissions, we do read each suggested change from our users and will make updates where applicable.

Close

Submission failed

For some reason your suggested change could not be submitted. Please <a>try again</a> in a few minutes. And thank you for taking the time to help us improve the quality of Unity Documentation.

Close

Cancel

Declaration

public static float SignedAngle(Vector2 from, Vector2 to);

Parameters

from The vector from which the angular difference is measured.
to The vector to which the angular difference is measured.

Returns

float The signed angle in degrees between the two vectors.

Description

Gets the signed angle in degrees between from and to.

The angle returned is the signed counterclockwise angle between the two vectors.
Note: The angle returned will always be between -180 and 180 degrees, because the method returns the smallest angle between the vectors. That is, it will never return a reflex angle. Angles are calculated from world origin point (0,0,0) as the vertex.
See Also: Angle function.

using UnityEngine;

public class Vector : MonoBehaviour { //Use these to get the GameObject's positions Vector2 m_MyFirstVector; Vector2 m_MySecondVector;

float m_Angle;

//You must assign to these two GameObjects in the Inspector public GameObject m_MyObject; public GameObject m_MyOtherObject;

void Start() { //Initialise the Vector m_MyFirstVector = Vector2.zero; m_MySecondVector = Vector2.zero; m_Angle = 0.0f; }

void Update() { //Fetch the first GameObject's position m_MyFirstVector = new Vector2(m_MyObject.transform.position.x, m_MyObject.transform.position.y); //Fetch the second GameObject's position m_MySecondVector = new Vector2(m_MyOtherObject.transform.position.x, m_MyOtherObject.transform.position.y); //Find the angle for the two Vectors m_Angle = Vector2.SignedAngle(m_MyFirstVector, m_MySecondVector);

//Draw lines from origin point to Vectors Debug.DrawLine(Vector2.zero, m_MyFirstVector, Color.magenta); Debug.DrawLine(Vector2.zero, m_MySecondVector, Color.blue);

//Log values of Vectors and angle in Console Debug.Log("MyFirstVector: " + m_MyFirstVector); Debug.Log("MySecondVector: " + m_MySecondVector); Debug.Log("Angle Between Objects: " + m_Angle); }

void OnGUI() { //Output the angle found above GUI.Label(new Rect(25, 25, 200, 40), "Angle Between Objects" + m_Angle); } }