HMA_withAlerts

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Author: MT4 release WizardSerg <wizardserg@mail.ru>, ?? ??????? ForexMagazine #104
HMA_withAlerts

This script is designed to provide traders with a visual and automated way to identify market trends using the Hull Moving Average (HMA). Unlike standard moving averages that can sometimes lag behind price action, this logic focuses on creating a smoother, more responsive trend line that helps distinguish between upward and downward movements.

How the Logic Works

1. Data Processing and Smoothing The script begins by performing a multi-step calculation to generate the Hull Moving Average. It takes raw price data and applies a specific weighted formula: it doubles a shorter moving average and subtracts a longer moving average. This mathematical "sandwiching" is intended to reduce the delay typically found in standard indicators, making the resulting line more reactive to sudden market shifts.

2. Trend Identification Once the primary average is calculated, the script analyzes its direction by comparing its current value against its previous value:

  • Uptrend: If the current value is higher than the previous one, the script identifies an upward trend.
  • Downtrend: If the current value is lower than the previous one, it identifies a downward trend.

3. Visual Representation On your chart, the indicator translates these mathematical findings into visual cues:

  • It maintains two distinct buffers to separate upward and downward trends.
  • When the trend is positive (rising), the script highlights the line in green.
  • When the trend turns negative (falling), the line changes to dark violet.
  • This color-switching allows you to see exactly where momentum shifts occur at a glance.

4. Automated Notifications To ensure you don't have to watch the screen constantly, the script includes a built-in alert system. It monitors for "Color Changes"—the specific moment the trend flips from up to down, or vice versa:

  • Pop-up Alerts: If enabled, a visual and audio alert will trigger on your platform the moment a trend reversal is detected.
  • Email Notifications: The script can be configured to send an automated email directly to your inbox when a trend change occurs, providing you with real-time updates even when you are away from your computer.

Summary of User Controls

You can customize the sensitivity and delivery of these signals through the input settings:

  • Period: Adjusts how many bars of data the average looks at (higher numbers make it smoother but slower; lower numbers make it faster but more volatile).
  • Method: Determines the calculation style of the underlying averages.
  • Alert/Email Toggles: Allows you to turn your desired notification methods on or off.
Indicators Used
Moving average indicatorMoving average indicator
Miscellaneous
Implements a curve of type %1It issuies visual alerts to the screenIt sends emails
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HMA_withAlerts 
//+------------------------------------------------------------------+ 
//| HMA.mq4 
//| Copyright © 2006 WizardSerg <wizardserg@mail.ru>, ?? ??????? ForexMagazine #104 
//| wizardserg@mail.ru 
//|                         Revised by IgorAD,igorad2003@yahoo.co.uk |   
//|                                        http://www.forex-tsd.com/ |                                      
//+------------------------------------------------------------------+
#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 Green 
#property indicator_color2 DarkViolet 
//---- input parameters 
extern int       period=21; 
extern int       method=3;                         // MODE_SMA 
extern int       price=0;                          // PRICE_CLOSE 
extern bool      Alert_Enabled=true;
extern bool      Email_Enabled=true;
extern string    Email_Subject="HMA Color Change";
//---- buffers 
double Uptrend[];
double Dntrend[];
double ExtMapBuffer[]; 
bool Uptrend_Alert_Signal;
bool Downtrend_Alert_Signal;
bool Uptrend_Email_Signal;
bool Downtrend_Email_Signal;

//+------------------------------------------------------------------+ 
//| 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("Hull Moving Average("+period+")"); 
    Uptrend_Alert_Signal = false;
    Downtrend_Alert_Signal = false;
    Uptrend_Email_Signal = false;
    Downtrend_Email_Signal = false;
   
    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)); 
    } 

    for(x = 0; x < e-period; x++)
     
        ExtMapBuffer[x] = iMAOnArray(vect, 0, p, 0, method, x);        
    
    for(x = e-period; x >= 0; x--)
    {     
        trend[x] = trend[x+1];
        if (ExtMapBuffer[x]> ExtMapBuffer[x+1]) trend[x] =1;
        if (ExtMapBuffer[x]< ExtMapBuffer[x+1]) trend[x] =-1;
    
    if (trend[x]>0)
    { Uptrend[x] = ExtMapBuffer[x]; 
      if (trend[x+1]<0) Uptrend[x+1]=ExtMapBuffer[x+1];
      Dntrend[x] = EMPTY_VALUE;
      if(x==0 && Dntrend[x] == EMPTY_VALUE && Dntrend[x+1] != EMPTY_VALUE && Alert_Enabled == true && Uptrend_Alert_Signal == false)
      {
      Alert("HMA Color Change on " + Symbol());
      Uptrend_Alert_Signal = true;
      Downtrend_Alert_Signal = false;
      }
      if(x==0 && Dntrend[x] == EMPTY_VALUE && Dntrend[x+1] != EMPTY_VALUE && Email_Enabled == true && Uptrend_Email_Signal == false)
      {
      SendMail(Email_Subject, "HMA Color Change on " + Symbol());
      Uptrend_Email_Signal = true;
      Downtrend_Email_Signal = false;
      }
      
    }
    else              
    if (trend[x]<0)
    { 
      Dntrend[x] = ExtMapBuffer[x]; 
      if (trend[x+1]>0) Dntrend[x+1]=ExtMapBuffer[x+1];
      Uptrend[x] = EMPTY_VALUE;
      if(x==0 && Uptrend[x] == EMPTY_VALUE && Uptrend[x+1] != EMPTY_VALUE && Alert_Enabled == true && Downtrend_Alert_Signal == false)
      {
      Alert("HMA Color Change on " + Symbol());
      Uptrend_Alert_Signal = false;
      Downtrend_Alert_Signal = true;
      }
      if(x==0 && Uptrend[x] == EMPTY_VALUE && Uptrend[x+1] != EMPTY_VALUE && Email_Enabled == true && Downtrend_Email_Signal == false)
      {
      SendMail(Email_Subject, "HMA Color Change on " + Symbol());
      Uptrend_Email_Signal = false;
      Downtrend_Email_Signal = true;
      }
    }              
    
   // Print( " trend=",trend[x]);
    }
    
    return(0); 
} 
//+------------------------------------------------------------------+

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