HalfTrend – Amibroker AFL Code – Better than Supertrend

Marketcalls had published Supertrend with multiple variations from 2012 onwards. And this time a very popular ATR based strategy Halftrend which is considered a better version of supertrend to manage sideways markets with lesser whipsaws is coded in Amibroker totally inspired by Tradingview Halftrend and MQL4 Halftrend Strategy source codes.

Strategy Timeframe : 15mins

Trading Symbol: Nifty Futures

Trading Commissions Used : 0.02% per leg

Historical Data Backtesting Period: 2011 – 2021

Position Sizing : 1 Lot (Fixed Lot)

Equity Curve

Drawdown Curve

Backtesting Report

Amibroker – Halftrend AFL Code

//Coded by Rajandran R - www.marketcalls.in / www.algomojo.com
//Code Inspired from Tradingview Pinescript
//Orginal Credits : Everget 
//Tradingview Url : https://www.tradingview.com/script/U1SJ8ubc-HalfTrend/


_SECTION_BEGIN("Half Trend Strategy");

SetPositionSize(1*RoundLotSize,spsShares);

amplitude = Param("Amplitude",2,1,10,1);
channelDeviation = Param("Channel Deviation",2,1,10,1);
showChannels = ParamToggle("Show ATR Channels","SHOW|HIDE",1);

main = Null;
trend = 0;
upLine = Null;
downLine = Null;
upperBand = Null;
lowerBand = Null;

atrHigh = Null;
atrLow = Null;


atr2 = ATR(100)/2;
dev = channelDeviation * atr2;

currentHigh = Ref(High, -abs(HHVBars(High,amplitude)));
currentLow =  Ref(low, -abs(LLVBars(Low,amplitude)));

upperBand = MA(High,amplitude);
lowerBand = MA(Low,amplitude);


for(i=1;i<BarCount;i++)
{

	// update trend direction and main Support Resistance values
      if (trend[i-1] > 0) {
         main[i] = max(main[i-1], currentLow[i]);
         if (upperBand[i] < main[i] && Close[i] < Low[i-1]) {
            trend[i] = -1;
            main[i] = min(main[i-1], currentHigh[i]);
         }
         else trend[i] = trend[i-1] + 1;
      }
      else if (trend[i-1] < 0) {
         main[i] = min(main[i-1], currentHigh[i]);
         if (lowerBand[i] > main[i] && Close[i] > High[i-1]) {
            trend[i] = 1;
            main [i] = max(main[i-1], currentLow[i]);
         }
         else trend[i] = trend[i-1] - 1;
      }
      else {
         // initialize the first, left-most value
         if (Close[i] > Close[i-1]) {
            trend[i] = 1;
            main[i] = currentLow[i];
         }
         else {
            trend[i] = -1;
            main [i] = currentHigh[i];
         }
      }

      // update Support Resistance sections
      if (trend[i] > 0) {
         upLine[i] = main[i];
         downLine[i] = null;
         
         atrHigh[i] = upLine[i] + dev[i];
		 atrLow[i] = upLine[i] - dev[i];
         if (showChannels) {                       // make sure reversals become visible
            upLine[i-1] = main[i-1];
            if (trend[i-1] > 0)
               downLine[i-1] = null;
         }
      }
      else /*(trend[i] < 0)*/{
         upLine[i] = null;
         downLine[i] = main[i];
         
         atrHigh[i] = downLine[i] + dev[i];
		 atrLow[i] = downLine[i] - dev[i];
         if (showChannels) {                       // make sure reversals become visible
            if (trend[i-1] < 0)
               upLine[i-1] = Null;
            downLine[i-1] = main[i-1];
         }
      }
   


}//end of for loop





Plot(upLine,"UpLine",colorgreen,styleThick);
Plot(downLine,"DownLine",colorRed,styleThick);

Plot(atrHigh,"ATR High",colorgreen,styleThick|styleDashed);
Plot(atrLow,"ATR Low",colorRed,styleThick|styleDashed);



Buy = trend == 1 ;
Sell = trend == -1 ;



Buy = ExRem(Buy,Sell);
Sell = ExRem(Sell,Buy);

Short = Sell;
Cover = Buy;


Buy = Ref(Buy,-1);
Sell = Ref(Sell,-1);

Short = Ref(Short,-1);
Cover = Ref(Cover,-1);

BuyPrice = ValueWhen(Buy,Open);
SellPrice = ValueWhen(Sell,Open);
ShortPrice = ValueWhen(Short,Open);
CoverPrice = ValueWhen(Cover,Open);


buycontinue = Flip(Buy,Sell);
shortcontinue = Flip(Short,Cover);




for( i = 0; i < BarCount; i++ ) 
 { 
if( Buy[i] ) PlotText("Buy",i,L[i],colorWhite,colorLime,-70);
if( Short[i] ) PlotText("Short",i,H[i],colorWhite,colorRed,70);
//if( Sell[i] ) PlotText( "Selln@" + C[ i ], i, H[ i ]+dist[i], colorRed, colorYellow ); 
 } 


/* Plot Buy and Sell Signal Arrows */
PlotShapes(IIf(Buy, shapeSquare, shapeNone),colorGreen, 0, L, Offset=-40);
PlotShapes(IIf(Buy, shapeSquare, shapeNone),colorLime, 0,L, Offset=-50);                      
PlotShapes(IIf(Buy, shapeUpArrow, shapeNone),colorWhite, 0,L, Offset=-45); 
PlotShapes(IIf(Sell, shapeSquare, shapeNone),colorRed, 0, H, Offset=40);
PlotShapes(IIf(Sell, shapeSquare, shapeNone),colorOrange, 0,H, Offset=50);                      
PlotShapes(IIf(Sell, shapeDownArrow, shapeNone),colorWhite, 0,H, Offset=-45);




for(i=BarCount-1;i>1;i--)

{

if(Buy[i] == 1)

{

entry = open[i];

sig = 1;  //flag contains 1 when buy is valid

tar1 = entry + (entry * .0050);

tar2 = entry + (entry * .0092);

tar3 = entry + (entry * .0179);

 

bars = i;

i = 0;

}

if(Short[i] == 1)

{

sig = -1; //flag contains -1 wjhen short is valid

entry = open[i];


tar1 = entry - (entry * .0050);

tar2 = entry - (entry * .0112);

tar3 = entry - (entry * .0212);

 

 

bars = i;  // i - holds the value of bar index, computing the barindex value when the signal happened

i = 0;

}

}//for loop



Offset = 20;

Clr = IIf(sig == 1, colorLime, colorRed);


 

//plot target lines

Plot(LineArray(bars-Offset, tar1, BarCount-1, tar1,1), "", Clr, styleLine|styleDots, Null, Null, Offset);

Plot(LineArray(bars-Offset, tar2, BarCount-1, tar2,1), "", Clr, styleLine|styleDots, Null, Null, Offset);

Plot(LineArray(bars-Offset, tar3, BarCount-1, tar3,1), "", Clr, styleLine|styleDots, Null, Null, Offset);






_SECTION_END();


_SECTION_BEGIN("Signal Dashboard");

messageboard = ParamToggle("Message Board","Show|Hide",1);
upcolor = ParamColor("Up Color",colorBlue);
dncolor = ParamColor("Down Color",colorRed);



if (messageboard == 1 )

{

GfxSelectFont( "Tahoma", 13, 100 );

GfxSetBkMode( 1 );

GfxSetTextColor( colorWhite );


//Dashboard color changes dynamically according to the signals continuation
color = IIf(buycontinue, upcolor, IIf(shortcontinue, dncolor, Null));



GfxSelectSolidBrush(SelectedValue(color));


pxHeight = Status( "pxchartheight" ) ;

xx = Status( "pxchartwidth");

Left = 1100;
width = 310;

x = 5;
x2 = 360;
y = pxHeight;

sigstatus = WriteIf(buycontinue,"Buy Signal @ ","Sell Signal @");

 

GfxSelectPen( colorGreen, 1); // broader color
GfxRoundRect( x, y - 98, x2, y , 7, 7 ) ;
GfxTextOut( ( "Marketcalls - Halftrend"),13,y-90);
GfxTextOut( (" "),27,y-100);

if(SelectedValue(Buycontinue))
{
GfxTextOut( ("Last " + sigstatus + " Signal came " + BarsSince(Buy) * Interval()/60 + " mins ago"), 13, y-70) ; // The text format location
GfxTextOut( ("" + sigstatus + " : " + ValueWhen(Buy,BuyPrice)), 13, y-50);
GfxTextOut( ("Profit/Loss : " + NumToStr(Close-ValueWhen(Buy,BuyPrice),1.2)), 13, y-30);
}

if(SelectedValue(Shortcontinue))
{
GfxTextOut( ("Last " + sigstatus + " Signal came " + BarsSince(short) * Interval()/60 + " mins ago"), 13, y-70) ; // The text format location
GfxTextOut( ("" + sigstatus + " : " + ValueWhen(Short,ShortPrice)), 13, y-50);
GfxTextOut( ("Current P/L : " + NumToStr(ValueWhen(Short,ShortPrice)-Close,1.2)), 13, y-30);
}


//GfxTextOut( ("Trailing SL : " + Ref(TrendSL,-1) + " (" + WriteVal(IIf(sig == -1,entry-sl,sl-entry), 2.2) + ")"), 13, y-40);





}


_SECTION_END();

_SECTION_BEGIN("Top Dashboard");

X0 = 10;
Y0 = 20;

procedure DrawData (Text, x1, y1, x2, y2, colorFrom, colorTo)
{
	GfxSetOverlayMode(0);
	GfxSelectFont("Verdana", 8.5, 700);
	GfxSetBkMode(1);
	GfxGradientRect(x1, y1, x2, y2, colorFrom, colorTo);
	GfxDrawText(Text, x1, y1, x2, y2, 32|1|4|16);
}


DrawData (Name(), X0, Y0, X0+150, Y0+20, colorGrey40, colorblack);
DrawData (Date(), X0+155, Y0, X0+320, Y0+20, colorGrey40, colorblack);
DrawData ("Open : " + Open, X0+325, Y0, X0+450, Y0+20, colorGrey40, colorblack);
DrawData ("Close : " + Close, X0+455, Y0, X0+580, Y0+20, colorGrey40, colorblack);
DrawData ("High : " + High, X0+585, Y0, X0+710, Y0+20, colorGrey40, colorblack);
DrawData ("Low : " + Low, X0+715, Y0, X0+840, Y0+20, colorGrey40, colorblack);


_SECTION_END();




_SECTION_BEGIN("Price");
SetChartOptions(0,chartShowArrows|chartShowDates);
_N(Title = StrFormat("{{NAME}} - {{INTERVAL}} {{DATE}} Open %g, Hi %g, Lo %g, Close %g (%.1f%%) {{VALUES}}", O, H, L, C, SelectedValue( ROC( C, 1 ) ) ));
Plot( C, "Close", ParamColor("Color", colorDefault ), styleNoTitle | ParamStyle("Style") | GetPriceStyle() ); 
_SECTION_END();