//+------------------------------------------------------------------+
//|                                                     ColourMA.mq5 |
//|                                  Copyright 2018, Benjamin Pillet |
//|                                                                  |
//+------------------------------------------------------------------+
#property copyright "Copyright 2018, Benjamin Pillet"
#property link      ""
#property version   "1.00"
#property indicator_chart_window
#property indicator_buffers 1
#property indicator_plots   1
//--- plot MA
#property indicator_label1  "MA"
#property indicator_type1   DRAW_LINE
#property indicator_color1  clrRed
#property indicator_style1  STYLE_SOLID
#property indicator_width1  1
//--- input parameters
input ENUM_TIMEFRAMES      TF;
input int                  period;
input ENUM_MA_METHOD       Method;
input color                Colour;
//--- indicator handle and buffer
int            MAHandle;
double         MABuffer[];
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int OnInit()
  {
//--- indicator buffers mapping
   SetIndexBuffer(0,MABuffer,INDICATOR_DATA);
   PlotIndexSetInteger(0,PLOT_LINE_COLOR,0,Colour);
   MAHandle = iMA(_Symbol,TF,period,0,Method,PRICE_CLOSE);
   
//---
   return(INIT_SUCCEEDED);
  }
//+------------------------------------------------------------------+
//| 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[])
  {
//--- copy MA buffer
   int toCopy;
   if(prev_calculated>rates_total || prev_calculated<=0) toCopy=rates_total;
   else
     {
      toCopy=rates_total-prev_calculated;
      //--- last value is always copied
      toCopy++;
     }
   CopyBuffer(MAHandle,0,0,toCopy,MABuffer);
   
//--- return value of prev_calculated for next call
   return(rates_total);
  }
//+------------------------------------------------------------------+