1

This has been the bane of my existence for the past 2 weeks and have not been able to get it to do what I want. I have the dial turning correctly, But using the mouse or touch is not very intuitive. I can turn the dial by dragging the mouse to the left or right on the horizontal. but when I try and make circular motions it does not work.

Any help would be appreciated.

2

I’ve answered this question several times with different solutions for both GUI.DrawTexture() and for object in 3D space. Here is one of those links:

http://answers.unity3d.com/questions/389586/rotate-gui-texture-by-touch.html

3

Solution if object is rotating on the Z. Most of the credit goes to robertbu.

private Quaternion originalRotation;
private float  startAngle = 0;

public void Start()
{
		originalRotation = this.transform.rotation;
		
}

public void InputIsDown()
{
#if UNITY_IPHONE || UNITY_ANDROID
		
		originalRotation = this.transform.rotation;
		Vector3 screenPos = Camera.main.WorldToScreenPoint(transform.position);
		Vector3 vector = Input.GetTouch(0).position - screenPos;
		startAngle = Mathf.Atan2(vector.y, vector.x) * Mathf.Rad2Deg;
		//startAngle -= Mathf.Atan2(transform.right.y, transform.right.x) * Mathf.Rad2Deg;  // uncomment to pop to where mouse is 

#else
		
		originalRotation = this.transform.rotation;
		Vector3 screenPos = Camera.main.WorldToScreenPoint(transform.position);
		Vector3 vector = Input.mousePosition - screenPos;
		startAngle = Mathf.Atan2(vector.y, vector.x) * Mathf.Rad2Deg;
		//startAngle -= Mathf.Atan2(transform.right.y, transform.right.x) * Mathf.Rad2Deg;  // uncomment to pop to where mouse is 

#endif
}

public void InputIsHeld()
{
#if UNITY_IPHONE || UNITY_ANDROID

		Vector3 screenPos = Camera.main.WorldToScreenPoint(transform.position);
		Vector3 vector = Input.GetTouch(0).position - screenPos;
		float angle = Mathf.Atan2(vector.y, vector.x) * Mathf.Rad2Deg;
		Quaternion newRotation = Quaternion.AngleAxis(angle - startAngle , this.transform.forward);
		newRotation.y = 0; //This and the line below, may need to be changed depending on what axis the object is rotating on. 
		newRotation.eulerAngles = new Vector3(0,0,newRotation.eulerAngles.z);
		this.transform.rotation = originalRotation *  newRotation;
	
#else
		Vector3 screenPos = Camera.main.WorldToScreenPoint(transform.position);
		Vector3 vector = Input.mousePosition - screenPos;
		float angle = Mathf.Atan2(vector.y, vector.x) * Mathf.Rad2Deg;
		Quaternion newRotation = Quaternion.AngleAxis(angle - startAngle , this.transform.forward);
		newRotation.y = 0; //see comment from above 
		newRotation.eulerAngles = new Vector3(0,0,newRotation.eulerAngles.z);
		this.transform.rotation = originalRotation *  newRotation;
		
		
#endif
}