Unity UGUI实现卡片椭圆方向滚动

using UnityEngine;using System.Collections;using UnityEngine.UI;using DG.Tweening;public class CardMove : MonoBehaviour { GameObject[] sprites; int halfSize; Vector2 screenCenterPos; public float startAngle;//中间卡牌的角度 public float deltaAngle;//相邻卡牌的角度差值 public float moveSpeed;//移动动画的速度 public Vector3 center;//椭圆中心点 public float A = 1;//long axis public float B = 1;//short axis int cardcount; // Use this for initialization void Start () {  init (); } // Update is called once per frame void Update () { } /// <summary> /// 初始化卡牌显示位置 /// </summary> void init(){  screenCenterPos = new Vector2 (Screen.width*0.5f,Screen.height*0.5f);  cardcount = transform.childCount;   halfSize = (cardcount - 1) / 2;  sprites=new GameObject[cardcount];  for (int i = 0; i < cardcount; i++) {   sprites [i] = transform.GetChild (i).gameObject;   setPosition (i,false);   setDeeps (i);  } } /// <summary> /// 椭圆的半长轴为A，半短轴为B，计算椭圆上一点的位置 /// x=A*cos(angle),y=B*sin(angle) /// </summary> /// <param name="index">Index.</param> /// <param name="userTweener">是否使用tween动画.</param> void setPosition(int index,bool userTweener=true){  //计算每一张卡片在椭圆上相对中间卡牌的角度  float angle = 0;  if(index<halfSize){//left   angle=startAngle-(halfSize-index)*deltaAngle;  }else if(index>halfSize){//right   angle = startAngle + (index - halfSize) * deltaAngle;  }else{//medim   angle=startAngle;  }  //通过卡牌的角度，计算对应的位置  float xpos = A*Mathf.Cos((angle/180)*Mathf.PI);//+center.x;  float ypos = B*Mathf.Sin((angle/180)*Mathf.PI);//+center.y;  Debug.Log ("index="+index+",xpos="+xpos+",ypos="+ypos);  Vector2 pos = new Vector2 (xpos,ypos);//  Debug.Log ("screenPos="+screenPos+",wordPos="+wordPos);//通过doTween控制卡片移动动画  if(!userTweener){   sprites [index].GetComponent<Image> ().rectTransform.DOMove(new Vector2(screenCenterPos.x+pos.x,screenCenterPos.y+pos.y),0f);  }else   sprites [index].GetComponent<Image> ().rectTransform.DOMove(new Vector2(screenCenterPos.x+pos.x,screenCenterPos.y+pos.y),1f); } /// <summary> /// 计算每一张卡片的层级 /// </summary> /// <param name="index">Index.</param> void setDeeps(int index){  int deep = 0;  if (index < halfSize) {//左侧卡牌层级，从左侧到中间，层级依此递增   deep=index;  } else if (deep > halfSize) {//右侧卡牌层级，从中间到右侧，层级依此递减   deep=sprites.Length-(index+1);  } else {   deep = halfSize;  }  sprites [index].GetComponent<RectTransform> ().SetSiblingIndex (deep); } /// <summary> /// 左侧按钮点击，向左移动 /// </summary> public void OnLeftBtnClick(){  int length = sprites.Length;  GameObject temp=sprites[0];  for (int i = 0; i < length; i++) {//移动卡片在数组中的位置，依此向前移动一位   if (i == length - 1)    sprites [i] = temp;   else    sprites [i] = sprites [i + 1];  }  for (int i = 0; i < length; i++) {//跟新数组卡片需要显示的位置和层级   setPosition (i);   setDeeps (i);  } } /// <summary> /// 右侧按钮点击，向右移动 /// </summary> public void RightBtnClick(){  int length = sprites.Length;  GameObject temp=sprites[length-1];  for (int i = length-1; i >=0; i--) {   if (i == 0)    sprites [i] = temp;   else    sprites [i] = sprites [i - 1];  }  for (int i = 0; i < length; i++) {   setPosition (i);   setDeeps (i);  } }}