Added Heiken (Heikin) Ashi Indicator

Heiken Ashi/heiken_ashi.mq5

@@ -0,0 +1,87 @@
+
+//+------------------------------------------------------------------+
+//|                                                  Heiken_Ashi.mq5 |
+//|                        Copyright 2009, MetaQuotes Software Corp. |
+//|                                              http://www.mql5.com |
+//+------------------------------------------------------------------+
+#property copyright "2009, MetaQuotes Software Corp."
+#property link      "http://www.mql5.com"
+//--- indicator settings
+#property indicator_chart_window
+#property indicator_buffers 5
+#property indicator_plots   1
+#property indicator_type1   DRAW_COLOR_CANDLES
+#property indicator_color1  C'0,172,230', C'251,0,138'
+#property indicator_label1  "Heiken Ashi Open;Heiken Ashi High;Heiken Ashi Low;Heiken Ashi Close"
+//--- indicator buffers
+double ExtOBuffer[];
+double ExtHBuffer[];
+double ExtLBuffer[];
+double ExtCBuffer[];
+double ExtColorBuffer[];
+//+------------------------------------------------------------------+
+//| Custom indicator initialization function                         |
+//+------------------------------------------------------------------+
+void OnInit()
+  {
+//--- indicator buffers mapping
+   SetIndexBuffer(0,ExtOBuffer,INDICATOR_DATA);
+   SetIndexBuffer(1,ExtHBuffer,INDICATOR_DATA);
+   SetIndexBuffer(2,ExtLBuffer,INDICATOR_DATA);
+   SetIndexBuffer(3,ExtCBuffer,INDICATOR_DATA);
+   SetIndexBuffer(4,ExtColorBuffer,INDICATOR_COLOR_INDEX);
+//---
+   IndicatorSetInteger(INDICATOR_DIGITS,_Digits);
+//--- sets first bar from what index will be drawn
+   IndicatorSetString(INDICATOR_SHORTNAME,"Heiken Ashi");
+//--- sets drawing line empty value
+   PlotIndexSetDouble(0,PLOT_EMPTY_VALUE,0.0);
+//--- initialization done
+  }
+//+------------------------------------------------------------------+
+//| Heiken Ashi                                                      |
+//+------------------------------------------------------------------+
+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 &TickVolume[],
+                const long &Volume[],
+                const int &Spread[])
+  {
+   int i,limit;
+//--- preliminary calculations
+   if(prev_calculated==0)
+     {
+      //--- set first candle
+      ExtLBuffer[0]=Low[0];
+      ExtHBuffer[0]=High[0];
+      ExtOBuffer[0]=Open[0];
+      ExtCBuffer[0]=Close[0];
+      limit=1;
+     }
+   else limit=prev_calculated-1;
+
+//--- the main loop of calculations
+   for(i=limit;i<rates_total && !IsStopped();i++)
+     {
+      double haOpen=(ExtOBuffer[i-1]+ExtCBuffer[i-1])/2;
+      double haClose=(Open[i]+High[i]+Low[i]+Close[i])/4;
+      double haHigh=MathMax(High[i],MathMax(haOpen,haClose));
+      double haLow=MathMin(Low[i],MathMin(haOpen,haClose));
+
+      ExtLBuffer[i]=haLow;
+      ExtHBuffer[i]=haHigh;
+      ExtOBuffer[i]=haOpen;
+      ExtCBuffer[i]=haClose;
+
+      //--- set candle color
+      if(haOpen<haClose) ExtColorBuffer[i]=0.0; // set color DodgerBlue
+      else               ExtColorBuffer[i]=1.0; // set color Red
+     }
+//--- done
+   return(rates_total);
+  }
+//+------------------------------------------------------------------+