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

//| Heiken Ashi.mq4 |

//| http://www.mql4.com |

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

#property copyright "2006-2014, MetaQuotes Software Corp."

#property link "http://www.mql4.com"

#property description "We recommend next chart settings (press F8 or select menu 'Charts'->'Properties...'):"

#property description " - on 'Color' Tab select 'Black' for 'Line Graph'"

#property description " - on 'Common' Tab disable 'Chart on Foreground' checkbox and select 'Line Chart' radiobutton"

#property strict

#property indicator_chart_window

#property indicator_buffers 4

#property indicator_color1 Red

#property indicator_color2 White

#property indicator_color3 Red

#property indicator_color4 White

#property indicator_width1 1

#property indicator_width2 1

#property indicator_width3 3

#property indicator_width4 3

//---

input color ExtColor1 = Red; // Shadow of bear candlestick

input color ExtColor2 = White; // Shadow of bull candlestick

input color ExtColor3 = Red; // Bear candlestick body

input color ExtColor4 = White; // Bull candlestick body

//--- buffers

double ExtLowHighBuffer[];

double ExtHighLowBuffer[];

double ExtOpenBuffer[];

double ExtCloseBuffer[];

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

//| Custom indicator initialization function |

//|------------------------------------------------------------------|

void OnInit(void)

{

IndicatorShortName("Heiken Ashi");

IndicatorDigits(Digits);

//--- indicator lines

SetIndexStyle(0,DRAW_HISTOGRAM,0,1,ExtColor1);

SetIndexBuffer(0,ExtLowHighBuffer);

SetIndexStyle(1,DRAW_HISTOGRAM,0,1,ExtColor2);

SetIndexBuffer(1,ExtHighLowBuffer);

SetIndexStyle(2,DRAW_HISTOGRAM,0,3,ExtColor3);

SetIndexBuffer(2,ExtOpenBuffer);

SetIndexStyle(3,DRAW_HISTOGRAM,0,3,ExtColor4);

SetIndexBuffer(3,ExtCloseBuffer);

//---

SetIndexLabel(0,"Low/High");

SetIndexLabel(1,"High/Low");

SetIndexLabel(2,"Open");

SetIndexLabel(3,"Close");

SetIndexDrawBegin(0,10);

SetIndexDrawBegin(1,10);

SetIndexDrawBegin(2,10);

SetIndexDrawBegin(3,10);

//--- indicator buffers mapping

SetIndexBuffer(0,ExtLowHighBuffer);

SetIndexBuffer(1,ExtHighLowBuffer);

SetIndexBuffer(2,ExtOpenBuffer);

SetIndexBuffer(3,ExtCloseBuffer);

//--- 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 &tick_volume[],

const long &volume[],

const int &spread[])

{

int i,pos;

double haOpen,haHigh,haLow,haClose;

//---

if(rates_total<=10)

return(0);

//--- counting from 0 to rates_total

ArraySetAsSeries(ExtLowHighBuffer,false);

ArraySetAsSeries(ExtHighLowBuffer,false);

ArraySetAsSeries(ExtOpenBuffer,false);

ArraySetAsSeries(ExtCloseBuffer,false);

ArraySetAsSeries(open,false);

ArraySetAsSeries(high,false);

ArraySetAsSeries(low,false);

ArraySetAsSeries(close,false);

//--- preliminary calculation

if(prev_calculated>1)

pos=prev_calculated-1;

else

{

//--- set first candle

if(open[0]<close[0])

{

ExtLowHighBuffer[0]=low[0];

ExtHighLowBuffer[0]=high[0];

}

else

{

ExtLowHighBuffer[0]=high[0];

ExtHighLowBuffer[0]=low[0];

}

ExtOpenBuffer[0]=open[0];

ExtCloseBuffer[0]=close[0];

//---

pos=1;

}

//--- main loop of calculations

for(i=pos; i<rates_total; i++)

{

haOpen=(ExtOpenBuffer[i-1]+ExtCloseBuffer[i-1])/2;

haClose=(open[i]+high[i]+low[i]+close[i])/4;

haHigh=MathMax(high[i],MathMax(haOpen,haClose));

haLow=MathMin(low[i],MathMin(haOpen,haClose));

if(haOpen<haClose)

{

ExtLowHighBuffer[i]=haLow;

ExtHighLowBuffer[i]=haHigh;

}

else

{

ExtLowHighBuffer[i]=haHigh;

ExtHighLowBuffer[i]=haLow;

}

ExtOpenBuffer[i]=haOpen;

ExtCloseBuffer[i]=haClose;

}

//--- done

return(rates_total);

}

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

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