在Unity中的疊加畫布中點擊並拖動一個遊戲對象

Question

我有一個畫布設置，它在屏幕空間 - 疊加和我幾乎有我在找什麼，但結果只是一點點關閉。通過一點點關閉，我的意思是當我點擊並按住拖動我的廣告資源時，它不是鼠標所在的位置，但它非常接近。現在拖動不起作用，但當我完成拖動我的GameObject正確地返回到它的相應位置。

我的代碼：

void Awake(){ 
    rectTrans = GetComponent<RectTransform>(); 
} 

void Start(){ 
    localRectTrans = rectTrans.localPosition; 
} 

public void OnPointerUp(PointerEventData data){ 
    // IF we are dragging an item 
    if(itemBeingDragged != null){ 
     itemBeingDragged = null; 
     // return this gameobject to its original location. 
     rectTrans.localPosition = localRectTrans; 
    } 
} 

public void OnBeginDrag(PointerEventData data){ 
    // IF we have an item to drag. 
    if(isItem){ 
     // Set the itemBeingDragged to this gameobject. 
     itemBeingDragged = gameObject; 
     // Get the starting mouse location for dragging. 
     startMousePos = Input.mousePosition; 
    } 
} 

public void OnDrag(PointerEventData data){ 
    // IF we have an item to drag in this inventory slot. 
    if(isItem){ 
     // Get the location of the mouse. 
     Vector2 curMousePosition = Input.mousePosition; 
     // Get the difference in position from when the mouse was first clicked to where it is currently being dragged. 
     Vector2 diffInPos = curMousePosition - startMousePos; 
     // The current position based on the difference in position with the mouse and the local position of this inventory slot. 
     Vector2 curPos = localRectTrans + diffInPos; 
     transform.localPosition = curPos; 
    } 
} 

我怎樣才能得到這實際上正是我的鼠標光標？我覺得我很親密，但只是不斷畫空白。

Answer 1

使用RectTransformUtility.ScreenPointToLocalPointInRectangle。

public Canvas parentCanvasOfImageToMove; 
public Image imageToMove; 

public void OnDrag(PointerEventData data) 
{ 
    Vector2 pos; 
    RectTransformUtility.ScreenPointToLocalPointInRectangle(parentCanvasOfImageToMove.transform as RectTransform, data.position, parentCanvasOfImageToMove.worldCamera, out pos); 
    imageToMove.transform.position = parentCanvasOfImageToMove.transform.TransformPoint(pos); 
} 

OR

public Canvas parentCanvasOfImageToMove; 
public Image imageToMove; 

public void Update() 
{ 
    Vector2 pos; 
    RectTransformUtility.ScreenPointToLocalPointInRectangle(parentCanvasOfImageToMove.transform as RectTransform, Input.mousePosition, parentCanvasOfImageToMove.worldCamera, out pos); 
    imageToMove.transform.position = parentCanvasOfImageToMove.transform.TransformPoint(pos); 
} 

平滑運動只需更換

imageToMove.transform.position = parentCanvasOfImageToMove.transform.TransformPoint(pos); 

與

imageToMove.transform.position = Vector3.Lerp(imageToMove.transform.position, parentCanvasOfImageToMove.transform.TransformPoint(pos), Time.deltaTime * 30f);