[Unity] RectTransformUtility 팁

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

Unity - Scripting API: RectTransformUtility

 

UGUI 에서 RectTransform 의 위치를 가지고 월드좌표, 마우스좌표와 자주 연동시킬 때 많이 쓰는 함수 조금 정리.

 

<전체 그림>

RectTransform 이 붙은 게임오브젝트를 (0,0) 에서 width, height (200,200) 으로 위치시켰다.

<캔버스 크기>

<마우스 클릭지점>

마우스클릭을 (200,200) 의 거의 끝자락에 했음.

 

using UnityEngine;

public class RectUtils : MonoBehaviour
{
    [SerializeField] private RectTransform rectTransform;
    // Update is called once per frame
    void Update() {
        if (Input.GetMouseButtonDown(0)) {
            if (RectTransformUtility.RectangleContainsScreenPoint(rectTransform, Input.mousePosition, null)) {
                Debug.Log($"1. ScreenPoint is Contained");
            }

            if (RectTransformUtility.ScreenPointToLocalPointInRectangle(rectTransform, Input.mousePosition, null, out Vector2 anchoredPosition)) {
                Debug.Log($"2. anchoredPosition : {anchoredPosition}");
            }
        }
    }
}

 

RectangleContainsScreenPoint(rectTransform, Input.mousePosition, null)

 

ScreenPointToLocalPointInRectangle(rectTransform, Input.mousePosition, null, out Vector2 anchoredPosition)

 

만약 Canvas Render Mode 가 Overlay 이면 null 로 설정.

 

살짝 응용하면.

 

https://tech.pjin.jp/blog/2017/07/14/unity_ugui_sync_rendermode/

【Unity】uGUIをキャラクターの上に表示する手っ取り早い方法【RenderMode別】

 

Canvas Render Mode 를 Camera 로 수정

<1. 응용 설정>

<캔버스>

using UnityEngine;

public class UIController_Camera : MonoBehaviour {

    [SerializeField]
    private RectTransform canvasRectTfm;
    [SerializeField]
    private Transform targetTfm;

    private RectTransform myRectTfm;
    private Vector3 offset = new Vector3(0, 1.5f, 0);

    void Start() {
        myRectTfm = GetComponent<RectTransform>();
    }

    void Update() {
        Vector2 pos;

        Vector2 screenPos = RectTransformUtility.WorldToScreenPoint(Camera.main, targetTfm.position + offset);

        RectTransformUtility.ScreenPointToLocalPointInRectangle(canvasRectTfm, screenPos, Camera.main, out pos);

        Debug.Log(pos);

        myRectTfm.anchoredPosition = pos;

    }
}