Need help calculating rotation offset

Scripting
1

Hello!

I’m currently having problems calculating the rotation offset for my 2D characters arms.
I’m really crappy at math and I can’t for my life figure out the correct method on how to get the right offset amount.

I managed to get the correct offset from -90 to 90 but not from -90 to 90 through 180.
I calculated the compensation angle by taking 90+25 degrees to get it to align correctly when pointing straight up.
Then I took 115 degrees / 90 degrees to get the compensation angle which is 1.277777777777778 but then I hit a wall.

The script I’m using is based on a Java Script created by Dusk. Here is the code:

	public Transform target;
	public float camDistance;
	
	public float rightZPosition;
	public float leftZPosition;
	private float defaultPositionX;
	private float defaultPositionY;
	
	public bool extraRotation = false;
	private float angleExtra;
	private Vector3 mousePos;
	private Vector3 objectPos;
	public float angle;
	
	void Start(){
		defaultPositionX = target.transform.localPosition.x;
		defaultPositionY = target.transform.localPosition.y;
	}
	
	void Update()
	{
		if( transform.rotation.y == 0){ // If player is facing to the right
		
			// Flips the target object so that it faces the correct way
			if(target.position.z  != rightZPosition){
			target.transform.localPosition = new Vector3(defaultPositionX, defaultPositionY, rightZPosition);
			}
			
		    mousePos = Input.mousePosition;
		    mousePos.z = camDistance;
		    objectPos = Camera.main.WorldToScreenPoint(target.position);
		    mousePos.x = mousePos.x - objectPos.x;
		    mousePos.y = mousePos.y - objectPos.y;
		    angle = Mathf.Atan2(mousePos.y, mousePos.x) * Mathf.Rad2Deg;
			
			// Applies extra degrees if true
			if(extraRotation){
				angleExtra = angle * 1.277777777777778f;
			}
			
			if(extraRotation){ // Rotates the target object on Z axis (with extra degrees)
				target.rotation = Quaternion.Euler(0, 0, angleExtra);
			
			}else{ // Rotates the target object on Z axis (normal degrees)
				target.rotation = Quaternion.Euler(0, 0, angle);
			}
		
		}else{ // If player is facing to the left
		
			// Flips the target object so that it faces the correct way 
			if(target.position.z  != leftZPosition){
			target.transform.localPosition = new Vector3(defaultPositionX, defaultPositionY, leftZPosition);
			}
			
		    mousePos = Input.mousePosition;
		    mousePos.z = camDistance;
		    objectPos = Camera.main.WorldToScreenPoint(target.position);
		    mousePos.x = mousePos.x - objectPos.x;
		    mousePos.y = mousePos.y - objectPos.y;
		    angle = Mathf.Atan2(mousePos.y, mousePos.x) * Mathf.Rad2Deg;
			
			// Applies extra degrees if true
			if(extraRotation){
				// THIS PART IS THE ONE I'M HAVING PROBLEMS WITH!
				angleExtra = angle -25f; //aligns correct if pointed straight up
		    	}
			
			if(extraRotation){ // Rotates the target object on Z axis (with extra degrees)
				target.rotation = Quaternion.Euler(180, 0, -angleExtra);
			
			}else{ // Rotates the target object on Z axis (normal degrees)
				target.rotation = Quaternion.Euler(180, 0, -angle);
			}
		}	
	}

Thanks in advance!

2

Bump! I’m still having problems with this and I was wondering
is there a way to get the angle to only go between -90 to 90 instead of -180 to 180?

That will be much simpler because I can use the same offset number
when facing both left and right instead of having to complicate things?

Thanks!