Unity3D 滑动选牌

using UnityEngine;
using System.Collections.Generic;

public class Test : MonoBehaviour {
    float cardWidth = 152;
    float cardHeight = 212;
    private Vector2 touchFirst = Vector2.zero; //手指开始按下的位置  
    private Vector2 touchSecond = Vector2.zero; //手指拖动的位置   
    private float timer;//时间计数器    
    public float offsetTime = 0.1f;//判断的时间间隔  

    public Transform[] HandCards;
    List cardsList = new List(); 

    void OnGUI()   // 滑动方法02  
    {
        if (Event.current.type == EventType.MouseDown) //判断当前手指是按下事件  
        {
            Debug.Log(Screen.width);
            touchFirst = Event.current.mousePosition;//记录开始按下的位置  
            Debug.Log("滑动开始：" + touchFirst.x + "," + touchFirst.y);
        }

        if (Event.current.type == EventType.MouseDrag)
        {
            timer += Time.deltaTime;  //计时器  

            if (timer > offsetTime)
            {
                timer = 0;
                touchSecond = Event.current.mousePosition; //记录结束下的位置  
                Vector2 slideDirection = touchFirst - touchSecond;//开始减去结束
                float x = slideDirection.x;
                float y = slideDirection.y;
                
                //处理范围内的牌，加入选牌列表
                cardsList.Clear();
                for (int i = 0; i < HandCards.Length; i++)
                {
                    if (HandCards[i].parent.gameObject.activeSelf)
                    {
                        float lossyScaleX = HandCards[i].lossyScale.x;                                                                                  //屏幕缩放损耗
                        float leftPiont = RectTransformUtility.WorldToScreenPoint(null, HandCards[i].position).x - cardWidth * lossyScaleX / 2;         //牌左侧点
                        float rightPoint = RectTransformUtility.WorldToScreenPoint(null, HandCards[i].position).x + cardWidth * lossyScaleX / 2;        //牌右侧点
                        float lossyScaleY = HandCards[i].lossyScale.y;
                        float topPoint = Screen.height - RectTransformUtility.WorldToScreenPoint(null, HandCards[i].position).y + cardHeight * lossyScaleY / 2;    //牌上侧点
                        float bottomPoint = Screen.height - RectTransformUtility.WorldToScreenPoint(null, HandCards[i].position).y - cardHeight * lossyScaleY / 2; //牌下侧点
                        if (x > 0)  //向左滑动
                        {
                            if ((leftPiont > touchSecond.x && leftPiont < touchFirst.x))
                            {
                                if (touchSecond.y > bottomPoint && touchSecond.y < topPoint)
                                {
                                    cardsList.Add(HandCards[i]);
                                }
                            }
                        }
                        else        //向右滑动
                        {
                            if (((leftPiont < touchSecond.x && leftPiont > touchFirst.x)))
                            {
                                if (touchSecond.y > bottomPoint && touchSecond.y < topPoint)
                                {
                                    cardsList.Add(HandCards[i]);
                                }
                            }
                        }
                    }
                }
            }
        }
        else if (Event.current.type == EventType.MouseUp)
        {
            //选中的牌操作
            for (int i = 0; i < cardsList.Count; i++)
            {
                cardsList[i].localPosition = new Vector3(cardsList[i].localPosition.x, cardsList[i].localPosition.y + 50, 0);
            }
            cardsList.Clear();
        }
    }
}