how i can understand if the color of two heiken ashi candle has changed

52

In mql4, how i can understand if the last ha candle has change it's color from previous candle?

i get info about ha candle, with this code:

last ha candle:

int shiftLastCandle = 1;

double haOpen=iCustom(NULL,PERIOD_D1,"HeikenAshi",Red,White,Red,White,2,shiftLastCandle);

double haClose=iCustom(NULL,PERIOD_D1,"HeikenAshi",Red,White,Red,White,3,shiftLastCandle);
double haHigh=iCustom(NULL,PERIOD_D1,"HeikenAshi",Red,White,Red,White,0,shiftLastCandle);
double haLow=iCustom(NULL,PERIOD_D1,"HeikenAshi",Red,White,Red,White,1,shiftLastCandle);

Print("haOpen ",haOpen," haClose ",haClose," haHigh ",haHigh," haLow ",haLow);

previous candle

int shiftPrevCandle = 2;

double haOpen=iCustom(NULL,PERIOD_D1,"HeikenAshi",Red,White,Red,White,2,shiftPrevCandle);
double haClose=iCustom(NULL,PERIOD_D1,"HeikenAshi",Red,White,Red,White,3,shiftPrevCandle);
double haHigh=iCustom(NULL,PERIOD_D1,"HeikenAshi",Red,White,Red,White,0,shiftPrevCandle);
double haLow=iCustom(NULL,PERIOD_D1,"HeikenAshi",Red,White,Red,White,1,shiftPrevCandle);

how i can understand if the color of this two candle has changed?

Moderator
29869

You should look at Heiken Ashi indicator's code to see how it works.
52

Alain Verleyen:
You should look at Heiken Ashi indicator's code to see how it works.

Alain, i look to che ha indicator code, but i dont understand  when the color of  two candle has changed

//+------------------------------------------------------------------+
//|                                                  Heiken Ashi.mq4 |
//|                   Copyright 2006-2014, MetaQuotes Software Corp. |
//|                                              http://www.mql4.com |
//+------------------------------------------------------------------+
#property copyright   "2006-2014, MetaQuotes Software Corp."
#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[],
{
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);
}
//+------------------------------------------------------------------+

Moderator
29869

andream1977:

Alain, i look to che ha indicator code, but i dont understand  when the color of  two candle has changed

if(haOpen<haClose)
{
ExtLowHighBuffer[i]=haLow;
ExtHighLowBuffer[i]=haHigh;
}
else
{
ExtLowHighBuffer[i]=haHigh;
ExtHighLowBuffer[i]=haLow;

}

//+-------+

When haOpen<haClose it's 1 color, when haOpen>=haClose it's other color.