color iObjectColor(double myInput)

   {

      color myColor;

      if (myInput > 0)

         myColor = Green; //正数颜色为绿色

      if (myInput < 0)

         myColor = Red; //负数颜色为红色

      if (myInput == 0)

         myColor = DarkGray; //0颜色为灰色

      return(myColor);

   }