Input.mousePosition
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class Test_Mouse : MonoBehaviour {
public GameObject go;
// Use this for initialization
void Start () {
}
// Update is called once per frame
void Update () {
Debug.Log(" "+Input.mousePosition);
//go.GetComponent<RectTransform>().sizeDelta = new Vector2(Input.mousePosition.x, Input.mousePosition.y);
//go.GetComponent<RectTransform>().localPosition = new Vector3(Input.mousePosition.x, Input.mousePosition.y,0);
//Camera.main.WorldToScreenPoint(Input.mousePosition);
go.GetComponent<RectTransform>().position = new Vector3(Input.mousePosition.x, Input.mousePosition.y, 0);
}
}
因为
Input.mousePosition
计算的坐标，是以左下角为 原点。
所以跟随的Image图片的锚点，要设置为左下角。
并且Rect Transform的Pos X ,Pos Y,Pos Z为0，0，0
go.GetComponent<RectTransform>().position = new Vector3(Input.mousePosition.x, Input.mousePosition.y, 0);注意这里 的Image的 位置不能是 localPosition，会产生 偏差。
正确的是position。
你会发现，是Image图片的 中点，跟随 鼠标进行移动。
----------------------------------------
go.GetComponent<RectTransform>().sizeDelta【参考文章1，2】
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class Test_Mouse : MonoBehaviour {
public GameObject go;
// Use this for initialization
void Start () {
}
// Update is called once per frame
void Update () {
Debug.Log(" "+Input.mousePosition);
//go.GetComponent<RectTransform>().sizeDelta = new Vector2(Input.mousePosition.x, Input.mousePosition.y);
//go.GetComponent<RectTransform>().localPosition = new Vector3(Input.mousePosition.x, Input.mousePosition.y,0);
//Camera.main.WorldToScreenPoint(Input.mousePosition);
go.GetComponent<RectTransform>().position = new Vector3(Input.mousePosition.x- (go.GetComponent<RectTransform>().sizeDelta.x/2),
Input.mousePosition.y - (go.GetComponent<RectTransform>().sizeDelta.y / 2)
, 0);
}
}
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class Test_Mouse : MonoBehaviour {
public GameObject go;
// Use this for initialization
void Start () {
}
// Update is called once per frame
void Update () {
Debug.Log(" "+Input.mousePosition);
//go.GetComponent<RectTransform>().sizeDelta = new Vector2(Input.mousePosition.x, Input.mousePosition.y);
//go.GetComponent<RectTransform>().localPosition = new Vector3(Input.mousePosition.x, Input.mousePosition.y,0);
//Camera.main.WorldToScreenPoint(Input.mousePosition);
go.GetComponent<RectTransform>().position = new Vector3(Input.mousePosition.x + (go.GetComponent<RectTransform>().sizeDelta.x/2),
Input.mousePosition.y + (go.GetComponent<RectTransform>().sizeDelta.y / 2)
, 0);
}
}
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class Test_Mouse : MonoBehaviour {
public GameObject go;
// Use this for initialization
void Start () {
}
// Update is called once per frame
void Update () {
Debug.Log(" "+Input.mousePosition);
//go.GetComponent<RectTransform>().sizeDelta = new Vector2(Input.mousePosition.x, Input.mousePosition.y);
//go.GetComponent<RectTransform>().localPosition = new Vector3(Input.mousePosition.x, Input.mousePosition.y,0);
//Camera.main.WorldToScreenPoint(Input.mousePosition);
go.GetComponent<RectTransform>().position = new Vector3(Input.mousePosition.x + (go.GetComponent<RectTransform>().sizeDelta.x/2),
Input.mousePosition.y - (go.GetComponent<RectTransform>().sizeDelta.y / 2)
, 0);
}
}
----------------------------------------
参考文章：
1.UGUI之RectTransform知识点 图解
http://www.manew.com/thread-41633-1-1.html
(出处: -【游戏蛮牛】-ar增强现实,虚拟现实,unity3d,unity3d教程下载首选u3d,unity3d官网)
2.
ugui在运行时改变RectTransform的大小
3.
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