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2024-01-25 04:03:36 +03:30
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+//+------------------------------------------------------------------+
+//|                                                     Momentum.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 "Momentum"
+#property strict
+
+#property indicator_separate_window
+#property indicator_buffers 1
+#property indicator_color1 DodgerBlue
+//--- input parameter
+input int InpMomPeriod=14;  // Momentum Period
+//--- buffers
+double ExtMomBuffer[];
+//+------------------------------------------------------------------+
+//| Custom indicator initialization function                         |
+//+------------------------------------------------------------------+
+int OnInit(void)
+  {
+   string short_name;
+//--- indicator line
+   SetIndexStyle(0,DRAW_LINE);
+   SetIndexBuffer(0,ExtMomBuffer);
+//--- name for DataWindow and indicator subwindow label
+   short_name="Mom("+IntegerToString(InpMomPeriod)+")";
+   IndicatorShortName(short_name);
+   SetIndexLabel(0,short_name);
+//--- check for input parameter
+   if(InpMomPeriod<=0)
+     {
+      Print("Wrong input parameter Momentum Period=",InpMomPeriod);
+      return(INIT_FAILED);
+     }
+//---
+   SetIndexDrawBegin(0,InpMomPeriod);
+//--- initialization done
+   return(INIT_SUCCEEDED);
+  }
+//+------------------------------------------------------------------+
+//| Momentum                                                         |
+//+------------------------------------------------------------------+
+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,limit;
+//--- check for bars count and input parameter
+   if(rates_total<=InpMomPeriod || InpMomPeriod<=0)
+      return(0);
+//--- counting from 0 to rates_total
+   ArraySetAsSeries(ExtMomBuffer,false);
+   ArraySetAsSeries(close,false);
+//--- initial zero
+   if(prev_calculated<=0)
+     {
+      for(i=0; i<InpMomPeriod; i++)
+         ExtMomBuffer[i]=0.0;
+      limit=InpMomPeriod;
+     }
+   else
+      limit=prev_calculated-1;
+//--- the main loop of calculations
+   for(i=limit; i<rates_total; i++)
+      ExtMomBuffer[i]=close[i]*100/close[i-InpMomPeriod];
+//--- done
+   return(rates_total);
+  }
+//+------------------------------------------------------------------+