Unity 屏幕坐标到UGUI RectTransform本地坐标的转换

public static bool ScreenPointToLocalPointInRectangle(RectTransform rect, Vector2 screenPoint, Camera cam, out Vector2 localPoint);
  • rect: 对应的 RectTransform 的引用
  • screenPoint: 位置,基于屏幕坐标系
  • cam: 相机的引用,如果Canvas的Render Mode 为 Screen Space - Camera 模式,则需要填入 Render Camera 对应的引用
  • localPoint: rect 本地坐标系下的坐标(原点(0,0)位置受Anchor的影响)

参考:
https://docs.unity3d.com/ScriptReference/RectTransformUtility.ScreenPointToLocalPointInRectangle.html

using UnityEngine;
using UnityEngine.UI;
using System.Collections;
using UnityEngine.EventSystems;
 
public class GlobalTest : MonoBehaviour
{
    public Canvas canvas;
    Text uiText;
    RectTransform canvasRect;
    RectTransform textRect;
    void Start()
    {
        uiText = canvas.GetComponentInChildren();
        canvasRect = canvas.GetComponent();
        textRect = uiText.GetComponent();
 
        Debug.Log(textRect.anchoredPosition);
 
    }
 
    void Update()
    {
        if (Input.GetMouseButtonUp(0))
        {
            Vector2 outVec;
            if (RectTransformUtility.ScreenPointToLocalPointInRectangle(canvasRect,Input.mousePosition,null,out outVec))
            {
                Debug.Log("Setting anchored positiont to: " + outVec);
                textRect.anchoredPosition = outVec;
            }
        }
 
    }
}

参考:
https://forum.unity.com/threads/issues-with-recttransformutility-screenpointtolocalpointinrectangle.437246/

再说一句

也可以从UGUI的EventSystem中获得鼠标基于屏幕坐标系的点击位置

    public void OnPointerDown(PointerEventData pointerEventData)
    {
        //Output the name of the GameObject that is being clicked
        Debug.Log(name + "Game Object Click in Progress");
    }

参考:
https://docs.unity3d.com/ScriptReference/EventSystems.IPointerDownHandler.html

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