MA HISTOGRAM v 1.10

ÿþ//+------------------------------------------------------------------+

//|                                                      ProjectName |

//|                                      Copyright 2020, CompanyName |

//|                                       http://www.companyname.net |

//+------------------------------------------------------------------+

#property copyright "Copyright 2020, Szymon PalczyD
ski"

#property link      "https://www.mql5.com/en/users/stiopa"

#property version   "1.00"

#property strict

#property indicator_chart_window

#property indicator_buffers 3



#property indicator_label1  "Down Buffer"

#property indicator_type1   DRAW_HISTOGRAM

#property indicator_color1  clrRed

#property indicator_width1  2



#property indicator_label2  "Up Buffer"

#property indicator_type2   DRAW_HISTOGRAM

#property indicator_color2  clrBlue

#property indicator_width2  2



#property indicator_type3   DRAW_NONE

//--- External Variable

input  int                intPeriod    = 6;            // MA Period

input  ENUM_MA_METHOD     intMethod    = MODE_SMMA;    // MA Method

input  ENUM_APPLIED_PRICE intAppliedTo = PRICE_MEDIAN; // MA Applied to

input bool alert=True;//Alert  

input bool push=False;//Push Notifications

input bool mail=False;//Email



double TempBuffer[];

double DownBuffer[];

double UpBuffer[];



bool   UpTrendAlert=false, DownTrendAlert=false,test;

string _intMethod[5] = {"Simple","Exponential","Smoothed","Linear Weighted"};

string _intAppliedTo[8] = {"Close price","Open price","High price","Low price","Median price","Typical price","Weighted price"};

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//| Custom indicator initialization function                         |

//+------------------------------------------------------------------+

int OnInit()

  {

   if(intPeriod<3){

   Alert("This value means the incorrect set of input parameters. Must be intPeriod>=3");

   return(INIT_PARAMETERS_INCORRECT);

   }

   int DrawBeginIndex = intPeriod*2;

//--- indicator buffers mapping

   SetIndexBuffer(0,DownBuffer,INDICATOR_DATA);

   SetIndexBuffer(1,UpBuffer,INDICATOR_DATA);

   SetIndexBuffer(2,TempBuffer,INDICATOR_DATA);

   SetIndexDrawBegin(0,DrawBeginIndex);

   SetIndexDrawBegin(1,DrawBeginIndex);

   SetIndexDrawBegin(2,DrawBeginIndex);

//--- set indicator digits

   IndicatorDigits(_Digits);

   Comment("MA HISTOGRAM ("+(string)intPeriod+","+_intMethod[intMethod]+","+_intAppliedTo[intAppliedTo]+")");



//---

   return(INIT_SUCCEEDED);

  }

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//| Custom indicator iteration function                              |

//+------------------------------------------------------------------+

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[])

  {

//---



//--- check to have enough bars

   int limit = rates_total - intPeriod;

   if(rates_total <= limit)

      return(0);



//--- before the first run of OnCalculate

   limit = limit - prev_calculated;



   if(rates_total - prev_calculated == 0)

      limit = 1;  // after the first run of the OnCalculate

   else

      limit++;                                      // on the first tick of a new bar



//--- loop over bars to draw histogram

   for(int i=limit; i >= 0; i--)

     {

      //--- calculate sum

      double sum = 0.0;



      for(int j=0; j<intPeriod; j++)

         sum += iMA(_Symbol,PERIOD_CURRENT,intPeriod,0,intMethod,intAppliedTo,i+j);



      //--- fill buffer to draw histogram

      TempBuffer[i] = sum / intPeriod;

      DownBuffer[i] = TempBuffer[i+1];



      DownBuffer[i]  = TempBuffer[i] - (TempBuffer[i] - DownBuffer[i])*2;

      UpBuffer[i] = TempBuffer[i] + (TempBuffer[i] - DownBuffer[i])*2;



      string Message;

      if(DownBuffer[0]<UpBuffer[0] && DownBuffer[1]>UpBuffer[1] && i==0 && !UpTrendAlert)

        {

         Message = StringConcatenate("MA HISTOGRAM  --> Change of trend. Up Trend. Symbol: "+Symbol()+" Price "+DoubleToStr(Open[0],Digits));

         if(alert)

            Alert(Message);

         if(push)

            SendNotification(Message);

         if(mail)

            SendMail("MA HISTOGRAM",Message);

         UpTrendAlert = true;

         DownTrendAlert = false;

        }

      if(DownBuffer[0]>UpBuffer[0] && DownBuffer[1]<UpBuffer[1] && i==0 && !DownTrendAlert)

        {

         Message = StringConcatenate("MA HISTOGRAM  --> Change of trend. Down Trend. Symbol: "+Symbol()+" Price "+DoubleToStr(Open[0],Digits));

         if(alert)

            Alert(Message);

         if(push)

            SendNotification(Message);

         if(mail)

            SendMail("MA HISTOGRAM",Message);

         UpTrendAlert = false;

         DownTrendAlert = true;

        }

     }

//--- return value of prev_calculated for next call

   return(rates_total);

  }

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