一, RectTransformUtility.ScreenPointToLocalPointInRectangle
Ⅰ, 将屏幕坐标转换成相对坐标. 猜想至少有2个重要参数: ①, 相对于哪一个GO的相对坐标 . ②, 屏幕坐标
Ⅱ, Scene布置
Ⅲ, 脚本
using UnityEngine;
using UnityEngine.UI;
public class UIScripts : MonoBehaviour
{
[SerializeField]
private Image image;
public Canvas canvas;
void Start()
{
Vector2 pos;
if (RectTransformUtility.ScreenPointToLocalPointInRectangle(
canvas.transform as RectTransform,
this.image.transform.position,
this.canvas.worldCamera,
out pos))
{
Debug.Log(pos);
}
this.getImagePos();
}
private void getImagePos()
{
RectTransform rectT = this.image.transform as RectTransform;
Debug.Log(" ------ " + rectT.anchoredPosition);
}
void Update()
{
}
}
解析代码参数
参数1,(canvas.transform as RectTransform): 得到相对于参数1(GO)上坐标
参数2( 注意: canvas 的render mode为: Screen Space -Overlay , 所以Image的世界坐标就是屏幕坐标): 得到Image屏幕坐标在参数1上的相对位置
结果如下:
二, 扩展
Ⅰ, 将Image移动到鼠标点击的位置
Ⅱ, 脚本如下
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
public class UIClickScripts : MonoBehaviour
{
[SerializeField]
private Image image;
public Canvas canvas;
private Vector2 pos;
void Start()
{
}
void Update()
{
if (Input.GetMouseButton(0))
{
if (RectTransformUtility.ScreenPointToLocalPointInRectangle(
this.canvas.transform as RectTransform,//Local Panel
Input.mousePosition,//Screen Pos
canvas.worldCamera,
out this.pos
))
{
(this.image.transform as RectTransform).anchoredPosition = this.pos;
}
}
}
}
Ⅲ, 其实可以做一个缓动用Tween 或者用Unity自动的Lerp都行
