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请博易老师帮忙把MT4指标slope direction line转换成博易大师代码，谢谢

#property copyright "MT4 release WizardSerg <wizardserg@mail.ru>, ?? ??????? ForexMagazine #104"
#property link      "wizardserg@mail.ru"

#property indicator_chart_window
#property indicator_buffers 2
#property indicator_color1 LightBlue
#property indicator_color2 Tomato
//---- input parameters
extern int       period=80;
extern int       method=3;                         // MODE_SMA
extern int       price=0;                          // PRICE_CLOSE
//---- buffers
double Uptrend[];
double Dntrend[];
double ExtMapBuffer[];


//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()
{
    IndicatorBuffers(3);  
    SetIndexBuffer(0, Uptrend);
    //ArraySetAsSeries(Uptrend, true);
    SetIndexBuffer(1, Dntrend);
    //ArraySetAsSeries(Dntrend, true);
    SetIndexBuffer(2, ExtMapBuffer);
    ArraySetAsSeries(ExtMapBuffer, true);
    
    SetIndexStyle(0,DRAW_LINE,STYLE_SOLID,2);
    SetIndexStyle(1,DRAW_LINE,STYLE_SOLID,2);
    
    IndicatorShortName("Slope Direction Line("+period+")");
    return(0);
}

//+------------------------------------------------------------------+
//| Custor indicator deinitialization function                       |
//+------------------------------------------------------------------+
int deinit()
{
    // ???? ????? ?????? ??????
    return(0);
}

//+------------------------------------------------------------------+
//| ?????????? ???????                                               |
//+------------------------------------------------------------------+
double WMA(int x, int p)
{
    return(iMA(NULL, 0, p, 0, method, price, x));    
}

//+------------------------------------------------------------------+
//| Custom indicator iteration function                              |
//+------------------------------------------------------------------+
int start()
{
    int counted_bars = IndicatorCounted();
    
    if(counted_bars < 0)
        return(-1);
                  
    int x = 0;
    int p = MathSqrt(period);              
    int e = Bars - counted_bars + period + 1;
    
    double vect[], trend[];
    
    if(e > Bars)
        e = Bars;    

    ArrayResize(vect, e);
    ArraySetAsSeries(vect, true);
    ArrayResize(trend, e);
    ArraySetAsSeries(trend, true);
    
    for(x = 0; x < e; x++)
    {
        vect[x] = 2*WMA(x, period/2) - WMA(x, period);        
 //       Print("Bar date/time: ", TimeToStr(Time[x]), " close: ", Close[x], " vect[", x, "] = ", vect[x], " 2*WMA(p/2) = ", 2*WMA(x, period/2), " WMA(p) = ",  WMA(x, period)); 来源:程序化99网（ WWW.CXH99.COM ）br /> 比博易中的多空线与K线转向的匹配要精准得多 您好，复制以下代码。
 
A:=2*WMA(C,40)-WMA(C,80);  
PARTLINE2(A,A>REF(A,1),COLORRED,A<REF(A,1),COLORGRAY),LINETHICK2;  来源 程序化久久网