利用UGUI制作一个简单摇杆，效果图
1、首先建立两个Image,然后将其中一个为父物体，另一个为子物体，并且调整好大小:
ps:将子物体的锚点设置为居中
2、在父物体上写个JoyStick.cs脚本：
using UnityEngine;
using UnityEngine.EventSystems;
using System.Collections;
public class JoyStick : MonoBehaviour, IDragHandler, IEndDragHandler, IBeginDragHandler
{
public static float h, v; //传出hv
public float maxDis; //最大距离
private RectTransform childRectTrans;
private Coroutine coroutine = null;
void Start()
{
childRectTrans = transform.GetChild(0) as RectTransform;
}
public void OnBeginDrag(PointerEventData eventData)
{
if (coroutine != null)
{
StopCoroutine(coroutine);
coroutine = null;
}
}
public void OnDrag(PointerEventData eventData)
{
Vector3 outPos;
if (RectTransformUtility.ScreenPointToWorldPointInRectangle(this.transform as RectTransform, eventData.position, eventData.pressEventCamera, out outPos))
{
childRectTrans.position = outPos;
//限制拖拽距离
childRectTrans.anchoredPosition = Vector2.ClampMagnitude(childRectTrans.anchoredPosition, maxDis);
//或者利用子物体和父物体的距离判断是否超过最大距离，当距离大于等于最大的距离时候，
//计算父物体和子物体的向量，然后利用向量*最大距离来限制拖拽距离
//if (Vector2.Distance(childRectTrans.position, this.transform.position) > maxDis)
//{
// Vector2 dir = (childRectTrans.position - this.transform.position).normalized;
// childRectTrans.anchoredPosition = dir * maxDis;
//}
GetHV();
}
}
public void OnEndDrag(PointerEventData eventData)
{
//当结束拖动，要将物体归0,为了加一点缓冲效果
//(1)可以使用dotween等补间动画插件,会减少很多
//rectTransform.DoAnchoredPos(Vector2.zero,0.5f);
//(2)或者使用携程 这里使用携程
if (coroutine == null)
coroutine = StartCoroutine(IEToZeroPos(childRectTrans, 0.1f));
}
private void GetHV()
{
h = childRectTrans.anchoredPosition.x / maxDis;
v = childRectTrans.anchoredPosition.y / maxDis;
}
private IEnumerator IEToZeroPos(RectTransform rectTransform, float duartion)
{
if (duartion == 0f)
{
yield return null;
rectTransform.anchoredPosition = Vector2.zero;
GetHV();
coroutine = null;
yield break;
}
Vector2 currentpos = rectTransform.anchoredPosition;
float offx = currentpos.x / duartion;
float offy = currentpos.y / duartion;
while (rectTransform.anchoredPosition != Vector2.zero)
{
yield return null;
rectTransform.anchoredPosition = new Vector2(rectTransform.anchoredPosition.x - offx * Time.deltaTime, rectTransform.anchoredPosition.y - offy * Time.deltaTime);
GetHV();
if (rectTransform.anchoredPosition.sqrMagnitude < 8f)
{
rectTransform.anchoredPosition = Vector2.zero;
GetHV();
coroutine = null;
break;
}
}
}
}另外附上Cube上面的脚本
private void Update()
{
Vector3 dir = new Vector3(JoyStick.h, 0, JoyStick.v);
if (dir.sqrMagnitude > 0)
{
transform.Translate(dir * 3f * Time.deltaTime,Space.World);
Quaternion targatRotate = Quaternion.LookRotation(dir, Vector3.up);
transform.rotation = Quaternion.Slerp(transform.rotation, targatRotate, 3 * Time.deltaTime);
}
}加个使用doTween的吧
using UnityEngine;
using UnityEngine.EventSystems;
using System.Collections; using DG.Tweening;
public class JoyStick : MonoBehaviour, IDragHandler, IEndDragHandler, IBeginDragHandler
{
public static float h, v; //传出hv
public float maxDis; //最大距离
private RectTransform childRectTrans;
private Coroutine coroutine = null;
void Start()
{
childRectTrans = transform.GetChild(0) as RectTransform;
}
public void OnBeginDrag(PointerEventData eventData)
{
if (coroutine != null)
{
StopCoroutine(coroutine);
coroutine = null;
}
}
public void OnDrag(PointerEventData eventData)
{
Vector3 outPos;
if (RectTransformUtility.ScreenPointToWorldPointInRectangle(this.transform as RectTransform, eventData.position, eventData.pressEventCamera, out outPos))
{
childRectTrans.position = outPos;
//限制拖拽距离
childRectTrans.anchoredPosition = Vector2.ClampMagnitude(childRectTrans.anchoredPosition, maxDis);
//或者利用子物体和父物体的距离判断是否超过最大距离，当距离大于等于最大的距离时候，
//计算父物体和子物体的向量，然后利用向量*最大距离来限制拖拽距离
//if (Vector2.Distance(childRectTrans.position, this.transform.position) > maxDis)
//{
// Vector2 dir = (childRectTrans.position - this.transform.position).normalized;
// childRectTrans.anchoredPosition = dir * maxDis;
//}
GetHV();
}
}
public void OnEndDrag(PointerEventData eventData)
{
//当结束拖动，要将物体归0,为了加一点缓冲效果
//(1)可以使用dotween等补间动画插件,会减少很多
rectTransform.DoAnchoredPos(Vector2.zero,0.5f).OnUpdate(GetHV);
}
private void GetHV()
{
h = childRectTrans.anchoredPosition.x / maxDis;
v = childRectTrans.anchoredPosition.y / maxDis;
}
}以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持编程网。
