unity 当中UI的通过鼠标滚轮来进行缩放，并且约束放大缩小的范围
unity 当中UI的通过鼠标滚轮来进行缩放，并且约束放大缩小的范围```
using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;
public class UIScaleContor : MonoBehaviour, IPointerExitHandler, IPointerEnterHandler, IBeginDragHandler, IDragHandler
{
public float wheelSpeed;
public bool isTrue;
Vector3 _originScale;
Vector3 _originPoint;
public Button _closeButton;
Vector3 _scaleOne;
public void OnPointerEnter(PointerEventData eventData)
{
isTrue = true;
}
public void OnPointerExit(PointerEventData eventData)
{
isTrue = false;
}
// Start is called before the first frame update
void Start()
{
_originPoint = this.transform.position;
_originScale = this.transform.localScale;
_closeButton.onClick.AddListener(CloseImage);
_scaleOne = transform.localScale;
}
private void CloseImage()
{
this.transform.position = _originPoint;
this.transform.localScale = _originScale;
}
// Update is called once per frame
void Update()
{
//UI最大可以放到两倍
if (transform.localScale.x >= 2 || transform.localScale.x >= 2)
{
transform.localScale = new Vector3(2, 2, 2);
}
//UI最小可以缩小两倍
if (transform.localScale.x <= 0.5f || transform.localScale.x <= 0.5f)
{
transform.localScale = new Vector3(0.5f, 0.5f, 0.5f);
}
//通过鼠标滚轮键来对照片进行缩放
if (isTrue == true)
{
transform.localScale += new Vector3(Input.mouseScrollDelta.y * wheelSpeed, Input.mouseScrollDelta.y * wheelSpeed, Input.mouseScrollDelta.y * wheelSpeed);
}
}
private Image img;
Vector3 offPos;
Vector3 arragedPos;
///
/// 开始拖拽的时候
///
///
public void OnBeginDrag(PointerEventData eventData)
{
if (RectTransformUtility.ScreenPointToWorldPointInRectangle(transform.GetComponent(), Input.mousePosition
, eventData.enterEventCamera, out arragedPos))
{
offPos = transform.position - arragedPos;
}
}
///
/// 拖拽中
///
///
public void OnDrag(PointerEventData eventData)
{
transform.position = offPos + Input.mousePosition;
}
}
```javascript
using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;
public class YeMianSuoFang : MonoBehaviour, IPointerExitHandler, IPointerEnterHandler, IBeginDragHandler, IDragHandler
{
public float wheelSpeed;
public bool isTrue;
Vector3 _originScale;
Vector3 _originPoint;
public Button _closeButton;
Vector3 _scaleOne;
public void OnPointerEnter(PointerEventData eventData)
{
isTrue = true;
}
public void OnPointerExit(PointerEventData eventData)
{
isTrue = false;
}
// Start is called before the first frame update
void Start()
{
_originPoint = this.transform.position;
_originScale = this.transform.localScale;
_closeButton.onClick.AddListener(CloseImage);
_scaleOne = transform.localScale;
}
private void CloseImage()
{
this.transform.position = _originPoint;
this.transform.localScale = _originScale;
}
// Update is called once per frame
void Update()
{
//UI最大可以放到两倍
if (transform.localScale.x >= 2 || transform.localScale.x >= 2)
{
transform.localScale = new Vector3(2, 2, 2);
}
//UI最小可以缩小两倍
if (transform.localScale.x <= 0.5f || transform.localScale.x <= 0.5f)
{
transform.localScale = new Vector3(0.5f, 0.5f, 0.5f);
}
//通过鼠标滚轮键来对照片进行缩放
if (isTrue == true)
{
transform.localScale += new Vector3(Input.mouseScrollDelta.y * wheelSpeed, Input.mouseScrollDelta.y * wheelSpeed, Input.mouseScrollDelta.y * wheelSpeed);
}
}
private Image img;
Vector3 offPos;
Vector3 arragedPos;
///
/// 开始拖拽的时候
///
///
public void OnBeginDrag(PointerEventData eventData)
{
if (RectTransformUtility.ScreenPointToWorldPointInRectangle(transform.GetComponent(), Input.mousePosition
, eventData.enterEventCamera, out arragedPos))
{
offPos = transform.position - arragedPos;
}
}
///
/// 拖拽中
///
///
public void OnDrag(PointerEventData eventData)
{
transform.position = offPos + Input.mousePosition;
}
}