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unity3d - 移动设备上的 Unity2D 对象旋转

问题描述

我想知道是否只有当用户单击并拖动游戏对象时才能旋转对象。如果用户在其他任何地方单击并拖动，则游戏对象不应旋转。无论用户单击何处，带有此脚本的对象都会旋转。

void Update()
{
   

    if (Input.touchCount > 0)
    {
        

        touch = Input.GetTouch(0);
      
       

        if (touch.phase == TouchPhase.Moved)
        {
            Vector2 dir = Camera.main.ScreenToWorldPoint(Input.GetTouch(0).position) - Camera.main.ScreenToWorldPoint(transform.position);
            float angle = Mathf.Atan2(dir.y, dir.x) * Mathf.Rad2Deg;
            Quaternion rotation = Quaternion.AngleAxis(angle - 90, Vector3.forward);
            transform.rotation = rotation;


           transform.rotation = rotationZ * transform.rotation;


        }
     


    }

标签： unity3drotation

解决方案

您当前的代码确实只检查触摸..这些是否“击中”任何东西都没有关系。

例如，您可以使用 aPhysics.Raycast来检查您的触摸是否在使用的对象上方

// store the direction from object to touch when the touch started
private Vector2 startDirection;
// store the objects orientation when the touch started
private Quaternion startRotation;
// only process touch moved if the touch actually started above this object
private bool isValidTouch;

// The collider of this object
[SerializeField] Collider _collider;
// The main camera
[SerializeField] Camera _mainCamera;

private void Awake()
{
    if(!_collider) _collider = GetComponent<Collider>();
    if(!_mainCamera) _mainCamera = Camera.main;
}

void Update()
{
    if (Input.touchCount > 0)
    {
        touch = Input.GetTouch(0);
      
        var touchPosition = touch.position;

        switch(touch.phase)
        {
            case TouchPhase.Began:
                // Check if this touch actually is over this object
                if(_collider.RayCast(_mainCamera.ScreenPointToRay(touchPosition), out var hit))
                {
                    // Now store initial data
                    // You want to do ONLY ONE:
                    // - Either transform the touch into worldspace (more complicated)
                    // - OR transform the position into screenspace (easier)
                    // You definitely do not want to do both!
                    startDirection = (touchPosition - (Vector2)_mainCamera.WorldToScreenPoint(transform.position));
                    startRotation = transform.rotation;
                    isValidTouch = true;
                }
                break;
        
            case TouchPhase.Moved
                if(isValidTouch)
                {
                    // Get the current touch direction
                    var direction = (touchPosition - (Vector2)_mainCamera.WorldToScreenPoint(transform.position));
                    // Get the angle between them
                    var differenceAngle = Vector3.SignedAngle(startDirection, direction, Vector3.forward);
                    // rotate the original rotation according to the current angle
                    Quaternion rotation = startRotation * Quaternion.AngleAxis(differenceAngle, Vector3.forward);
                    transform.rotation = rotation;
                }
                break;

            case TouchPhase.Ended
               isValidTouch = false; 
               break;
        }
    }
}

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