想把RSI变成双线的，麻烦大神帮解决！谢谢！

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//|                                        RSI.mq4 |
//|              Copyright 2005-2014, metaQuotes Software Corp. |
//|                                http://www.mql4.com |
//+------------------------------------------------------------------+
#property copyright    2005-2014, metaQuotes Software Corp.
#property link      http://www.mql4.com
#property description Relative Strength Index
#property strict
#property indicator_separate_window
#property indicator_minimum    0
#property indicator_maximum    100
#property indicator_buffers    2
#property indicator_color1   DodgerBlue
#property indicator_color2   DarkOrange
#property indicator_level1   5.0
#property indicator_level2   95.0
#property indicator_level3   10.0
#property indicator_level4   90.0
#property indicator_levelcolor clrDimGray
#property indicator_levelstyle STYLE_DOT
//--- input parameters
input int InpRSIPeriod=4; // RSI Period
//--- buffers
double ExtRSIBuffer[];
double ExtPosBuffer[];
double ExtNegBuffer[];
//+------------------------------------------------------------------+
//| Custom indicator initialization function                  |
//+------------------------------------------------------------------+
int onInit(void)
   {
    string short_name;
//--- 2 additional buffers are used for counting.
    IndicatorBuffers(3);
    SetIndexBuffer(0,ExtRSIBuffer);
    SetIndexBuffer(1,ExtPosBuffer);
    SetIndexBuffer(2,ExtNegBuffer);
//--- indicator line
    SetIndexStyle(0,DRAW_LINE);
    SetIndexBuffer(0,ExtRSIBuffer);
//--- name for DataWindow and indicator subwindow label
    short_name= RSI( +string(InpRSIPeriod)+ )
    IndicatorShortName(short_name);
    SetIndexLabel(0,short_name);
//--- check for input
    if(InpRSIPeriod 2)
     {
      Print( Incorrect value for input variable InpRSIPeriod = ,InpRSIPeriod);
      return(INIT_FAILED);
     }
//---
    SetIndexDrawBegin(0,InpRSIPeriod);
//--- initialization done
    return(INIT_SUCCEEDED);
   }
//+------------------------------------------------------------------+
//| Relative Strength Index                             |
//+------------------------------------------------------------------+
int onCalculate(const int rates_total,
           const int prev_calculated,
           const datetime time[],
           const double open[],
           const double high[],
           const double low[],
           const double close[],
           const long tick_volume[],
           const long volume[],
           const int spread[])
   {
    int    i,pos;
    double diff;
//---
    if(Bars =InpRSIPeriod || InpRSIPeriod 2)
      return(0);
//--- counting from 0 to rates_total
    ArraySetAsSeries(ExtRSIBuffer,false);
    ArraySetAsSeries(ExtPosBuffer,false);
    ArraySetAsSeries(ExtNegBuffer,false);
    ArraySetAsSeries(close,false);
//--- preliminary calculations
    pos=prev_calculated-1;
    if(pos =InpRSIPeriod)
     {
      //--- first RSIPeriod values of the indicator are not calculated
      ExtRSIBuffer[0]=0.0;
      ExtPosBuffer[0]=0.0;
      ExtNegBuffer[0]=0.0;
      double sump=0.0;
      double sumn=0.0;
      for(i=1; i =InpRSIPeriod; i++)
       {
        ExtRSIBuffer=0.0;
        ExtPosBuffer=0.0;
        ExtNegBuffer=0.0;
        diff=close-close[i-1];
        if(diff 0)
          sump+=diff;
        else
          sumn-=diff;
       }
      //--- calculate first visible value
      ExtPosBuffer[InpRSIPeriod]=sump/InpRSIPeriod;
      ExtNegBuffer[InpRSIPeriod]=sumn/InpRSIPeriod;
      if(ExtNegBuffer[InpRSIPeriod]!=0.0)
        ExtRSIBuffer[InpRSIPeriod]=100.0-(100.0/(1.0+ExtPosBuffer[InpRSIPeriod]/ExtNegBuffer[InpRSIPeriod]));
      else
       {
        if(ExtPosBuffer[InpRSIPeriod]!=0.0)
          ExtRSIBuffer[InpRSIPeriod]=100.0;
        else
          ExtRSIBuffer[InpRSIPeriod]=50.0;
       }
      //--- prepare the position value for main calculation
      pos=InpRSIPeriod+1;
     }
//--- the main loop of calculations
    for(i=pos; i rates_total !IsStopped(); i++)
     {
      diff=close-close[i-1];
      ExtPosBuffer=(ExtPosBuffer[i-1]*(InpRSIPeriod-1)+(diff 0.0?diff:0.0))/InpRSIPeriod;
      ExtNegBuffer=(ExtNegBuffer[i-1]*(InpRSIPeriod-1)+(diff 0.0?-diff:0.0))/InpRSIPeriod;
      if(ExtNegBuffer!=0.0)
        ExtRSIBuffer=100.0-100.0/(1+ExtPosBuffer/ExtNegBuffer);
      else
       {
        if(ExtPosBuffer!=0.0)
          ExtRSIBuffer=100.0;
        else
          ExtRSIBuffer=50.0;
       }
     }
//---
    return(rates_total);
   }
//+------------------------------------------------------------------+

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