修复 BlowingDetect 的线速度均值，写错减法方向，导致永远都是从列表的头开始算速度均值

Project.FLY.Thick.Blowing/FLY.Thick.Blowing/Server/BlowingDetect.cs

@@ -952,42 +952,39 @@ namespace FLY.Thick.Blowing.Server
         {
             if (mRollList.Count > 1)
             {
-                DateTime sysTime1 = mRollList[mRollList.Count - 1].SysTime;//最后一次的sysTime
-                int cnt = 5;//5次均值
-                if (cnt > mRollList.Count)
-                    cnt = mRollList.Count;
-                //最少2秒
+                
+                int i_end = mRollList.Count() - 1;
 
-                DateTime sysTime2 = mRollList[mRollList.Count - cnt].SysTime;//5次前的sysTime
-                if (sysTime2 - sysTime1 < TimeSpan.FromSeconds(2)) 
+                DateTime time1 = mRollList[i_end].Time;//最后一次的time
+
+                int i_begin = i_end - 1;
+                //最少2秒
+                while (time1 - mRollList[i_begin].Time < TimeSpan.FromSeconds(2)) 
                 {
-                    cnt++;
-                    for (;cnt<= mRollList.Count;cnt++) {
-                        sysTime2 = mRollList[mRollList.Count - cnt].SysTime;
-                        if (sysTime2 - sysTime1 >= TimeSpan.FromSeconds(2)) {
-                            break;
-                        }
+                    i_begin--;
+                    if (i_begin<0)
+                    {
+                        ///超范围了
+                        break;
                     }
-                    if (cnt > mRollList.Count)
-                        cnt = mRollList.Count;
-                    sysTime2 = mRollList[mRollList.Count - cnt].SysTime;
                 }
+
+                if (i_begin < 0)
+                    i_begin = 0 ;//超范围了限制它
+
+                var sysTime1 = mRollList[i_begin].SysTime;
+                var sysTime2 = mRollList[i_end].SysTime;
+
                 
-                
-                TimeSpan ts_last = TimeSpan.FromTicks((sysTime1 - sysTime2).Ticks / (cnt - 1));//5次的平均滤波, 使用AD盒的时间算出来的时间差，最准
+                TimeSpan ts_last = TimeSpan.FromTicks((sysTime2 - sysTime1).Ticks / (i_end - i_begin));//5次的平均滤波, 使用AD盒的时间算出来的时间差，最准
 
-                DateTime dt11 = mRollList[mRollList.Count - (cnt - 1)].Time;//4次前的PC时间
                 //因为没有使用AD盒的时间，所以可以用DateTime.Now 比较
-                TimeSpan ts_now = TimeSpan.FromTicks((DateTime.Now - dt11).Ticks / (cnt - 1));//使用 电脑的时间，算出来的时间差，大概而已
-                TimeSpan ts_max;
+                TimeSpan ts_now = DateTime.Now - time1;//使用 电脑的时间，算出来的时间差，大概而已
+                TimeSpan ts_max = ts_last;
                 if (ts_now > (ts_last + ts_last))//超过了2倍的时间，肯定是慢下来了
                 {
                     ts_max = ts_now;
                 }
-                else
-                {
-                    ts_max = ts_last;
-                }
 
                 FilmVelocity = MofR / ts_max.TotalMinutes;
 
@@ -1980,7 +1977,7 @@ namespace FLY.Thick.Blowing.Server
         /// </summary>
         public void Dispose()
         {
-            Clear();
+            ClearBuf();
         }
 
         #region INotifyPropertyChanged 成员