Unity中，飞金币效果
需求从a点生成一些金币飞往b点。
a、b可以是3D世界中的点，也可以是UI中的点。
用途：获得金币后，出现金币效果飞往UI中显示金币数量的地方，表示获得了金币。
效果示意
如图，方块是3D世界中的起点，圆球是3D世界中的终点。白色正方形是UI中的起点，红色正方形是UI中的终点。
效果图中演示了起点和终点分别是3D世界中的点和UI中的点的各种情况。
飞金币效果.gif
游戏对象结构
EndPos是默认的终点（外界不传入终点时，使用该点作为终点）。
Canvas的RenderMode必须是：Camera。因为FlyObj是3d物体。
image.png
image.png
用法
UIFlyElementSys.Instance.PlayFlyCoinEffect(起点, 终点)具体代码
说明：需要用到插件 DOTween
using DG.Tweening;using System.Collections;using System.Collections.Generic;using UnityEngine;/// <summary>/// UI中，生成金币飞行效果：一串金币从起点飞到终点/// </summary>public class UIFlyElementController : MonoBehaviour{ private GameObject _coinTemplateGo; private RectTransform _endPosTrans; public Vector2 EndPos{ get { return _endPosTrans.transform.position; } } private List<GameObject> _coinGos; private Canvas _canvas; public Canvas Canvas{ get { return _canvas; } } private Camera _cam; public Camera Camera{ get { return _cam; } } public void Init() { _coinTemplateGo.SetActive(false); _coinGos = new List<GameObject>(); gameObject.SetActive(true); } private void OnDestroy() { _coinGos.Clear(); _coinGos = null; } public GameObject GetCoinGo() { if (_coinGos.Count==0) { _coinGos.Add(Instantiate(_coinTemplateGo)); } var go = _coinGos; _coinGos.Remove(go); return go; } public void RecyleCoinGo(GameObject coinGo) { coinGo.SetActive(false); coinGo.transform.SetParent(GetCoinGoParent()); coinGo.transform.localPosition = Vector3.zero; coinGo.transform.localRotation = Quaternion.identity; coinGo.transform.localScale = Vector3.one; _coinGos.Add(coinGo); } public Transform GetCoinGoParent() { return _coinTemplateGo.transform.parent; }}public class UIFlyElementSys{ private static UIFlyElementSys _instance; public static UIFlyElementSys Instance { get { if (_instance == null) { _instance = new UIFlyElementSys(); } return _instance; } } private UIFlyElementController _uiFlyElementController; private UIFlyElementController UIFlyElementController { get { if (_uiFlyElementController == null) { _uiFlyElementController = GameObject.FindObjectOfType<UIFlyElementController>(); _uiFlyElementController.Init(); } return _uiFlyElementController; } } private UIFlyElementSys() { } public void Destroy() {} private Vector2 WorldPosToUiWorldPos(Vector3 worldPos) { var screenPos = UIFlyElementController.Camera.WorldToScreenPoint(worldPos); RectTransformUtility.ScreenPointToLocalPointInRectangle(UIFlyElementController.Canvas.transform as RectTransform, screenPos, UIFlyElementController.Camera, out Vector2 uiPos); var pos = uiPos * UIFlyElementController.transform.localScale.x; return pos; } // 起始点：世界坐标 public float PlayFlyCoinEffect(Vector3 beginPos) { return PlayFlyCoinEffect(WorldPosToUiWorldPos(beginPos)); } public float PlayFlyCoinEffect(Vector2 beginPos) { return PlayFlyCoinEffect(beginPos, UIFlyElementController.EndPos); } public float PlayFlyCoinEffect(Vector3 beginPos, Vector3 endPos, int cnt = 10) { return PlayFlyCoinEffect(WorldPosToUiWorldPos(beginPos), WorldPosToUiWorldPos(endPos), cnt); } public float PlayFlyCoinEffect(Vector3 beginPos, Vector2 endPos, int cnt = 10) { return PlayFlyCoinEffect(WorldPosToUiWorldPos(beginPos), endPos, cnt); } public float PlayFlyCoinEffect(Vector2 beginPos, Vector3 endPos, int cnt = 10) { return PlayFlyCoinEffect(beginPos, WorldPosToUiWorldPos(endPos), cnt); } // 播放一个金币飞行效果。返回值：效果持续时间 public float PlayFlyCoinEffect(Vector2 beginPos, Vector2 endPos, int cnt = 10) { // TODO:可以直接在此处调用播放音效：金币飞行 var seq = GetFlyCoinEffectSeq(beginPos, endPos, cnt); seq.Play(); return seq.Duration(false); } private Sequence GetFlyCoinEffectSeq(Vector2 beginPos, Vector2 endPos, int cnt) { var step = Mathf.Clamp(cnt, 10, 30); Sequence seq = DOTween.Sequence(); for (int i = 0; i < step; i++) { GameObject cell = UIFlyElementController.GetCoinGo(); Transform flyObjTf = cell.transform; flyObjTf.SetParent(UIFlyElementController.GetCoinGoParent(), false); flyObjTf.position = endPos; var endPos3d = new Vector3(flyObjTf.localPosition.x, flyObjTf.localPosition.y, -100f); flyObjTf.position = beginPos; flyObjTf.localPosition = new Vector3(flyObjTf.localPosition.x, flyObjTf.localPosition.y, -100f); flyObjTf.gameObject.SetActive(true); var path = GetPath(flyObjTf.localPosition, endPos3d); var tempSeq = DOTween.Sequence(); var randomStartPos = new Vector2(flyObjTf.localPosition.x, flyObjTf.localPosition.y) + Vector2.up * 50 + UnityEngine.Random.insideUnitCircle * new Vector2(500, 200); Tween startMove = flyObjTf.DOLocalMove(new Vector3(randomStartPos.x, randomStartPos.y, -100f), 0.1f).SetUpdate(true); tempSeq.Append(startMove); tempSeq.AppendInterval(0.01f); Tween moveT = flyObjTf.DOLocalPath(path, 0.6f, PathType.CatmullRom).SetEase(Ease.InSine).SetUpdate(true); Tween scaleT = flyObjTf.DOScale(new Vector3(0.5f, 0.5f, 0.5f), 0.6f).SetEase(Ease.InBack).SetUpdate(true); Tween rotateT = flyObjTf.DORotate(new Vector3(0, 360, 0), 0.25f, RotateMode.FastBeyond360).SetLoops(-1, LoopType.Restart).SetEase(Ease.Linear).SetUpdate(true); tempSeq.Append(moveT); tempSeq.Join(scaleT); tempSeq.Join(rotateT); tempSeq.SetDelay(0.01f * i); tempSeq.SetUpdate(true); tempSeq.onComplete = () => { GameObject ttObj = cell; UIFlyElementController.RecyleCoinGo(ttObj); }; //加入总序列 seq.Join(tempSeq); } seq.SetUpdate(true); return seq; } private Vector3[] GetPath(Vector3 start, Vector3 end) { var middle = (start + end) / 2; middle += UnityEngine.Random.Range(-0.2f, 0.2f) * 5.4f * Vector3.right; return new Vector3[] { middle, end }; }}
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