Unity之2d对象跟随鼠标旋转

public float turnSpeed = 3f;
// Update is called once per frame
void Update () {
if(Input.GetMouseButton(0)){
Vector3 worldPos = Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x,Input.mousePosition.y,-Camera.main.transform.position.z));
Vector3 direction = worldPos-transform.position;
direction.z=0f;
direction.Normalize();

float targetAngle = Mathf.Atan2(direction.y,direction.x)*Mathf.Rad2Deg;
transform.rotation = Quaternion.Slerp( transform.rotation, Quaternion.Euler( 0, 0, targetAngle ), turnSpeed * Time.deltaTime );
}
}