improve slopfocus

OTSIncAMeasureApp/0-OTSModel/OTSDataType/CSlopFocusParam.cs

@@ -29,7 +29,7 @@ namespace OTSMeasureApp._0_OTSModel.OTSDataType
     }
     public class CSlopFocusParam
     {
-        private bool m_IsUsingSlopParam;
+        private bool m_IsUsingSlopParam=false;
         private Point m_FirstPoint;
         private double m_FirstWD=0;
         private Point m_SecondPoint;