// Downloaded From https://www.WiseStockTrader.com
// E.M.Pottasch, 9/20/2010
// using fractals for trendlines
// Version 6a: 
// each trendline has 3 segments, see explanations 
// between code. Segments are not combined because 
// some trendlines partially overlap

SetBarsRequired(sbrAll,sbrAll);
xx = Cum(1);
nbar = Param("nbar",5,2,50,1); 

// define fractals
PHigh = H > Ref(HHV(H,nbar),-1) AND Ref(HHV(H,nbar),nbar) <= H;
PHighPrice = ValueWhen(PHigh,H);
PLow = L < Ref(LLV(L,nbar),-1) AND Ref(LLV(L,nbar),nbar) >= L;
PLowPrice = ValueWhen(PLow,L); 

// lower trendline, segment 1: between fractal points
startval_L = ValueWhen(PLow,L,1); 
endval_L = ValueWhen(PLow,L,0); 
startbar_L = ValueWhen(PLow,xx,1); 
endbar_L = ValueWhen(PLow,xx,0); 
aa_L = (endval_L-startval_L)/(endbar_L-startbar_L);
bb_L = startval_L;
trendline_L = aa_L * (xx - startbar_L) + bb_L;
// slope calculations for display purpose only
dtrendline_L = trendline_L - Ref(trendline_L,-1);

// lower extended trendline, segment 2: extend segment 1 to next fractals pivot 
startval_L_extend = ValueWhen(PLow,L,2); 
endval_L_extend = ValueWhen(PLow,L,1); 
startbar_L_extend = ValueWhen(PLow,xx,2); 
endbar_L_extend = ValueWhen(PLow,xx,1); 
aa_L_extend = (endval_L_extend-startval_L_extend)/(endbar_L_extend-startbar_L_extend);
bb_L_extend = startval_L;
trendline_L_extend = aa_L_extend * (xx - startbar_L) + endval_L_extend; 
// slope calculations for display purpose only
dtrendline_L_extend = trendline_L_extend - Ref(trendline_L_extend,-1);
dtrendline_L_extend = IIf(PLow,Ref(dtrendline_L,-1),dtrendline_L_extend);

// lower extended trendline, segment 3: extend segment 2 nbars past the fractal pivot
startval_L_extend2 = ValueWhen(PLow,L,3); 
endval_L_extend2 = ValueWhen(PLow,L,2); 
startbar_L_extend2 = ValueWhen(PLow,xx,3); 
endbar_L_extend2 = ValueWhen(PLow,xx,2); 
aa_L_extend2 = (endval_L_extend2-startval_L_extend2)/(endbar_L_extend2-startbar_L_extend2);
bb_L_extend2 = endval_L_extend2;
trendline_L_extend2 = aa_L_extend2 * (xx - endbar_L_extend2) + endval_L_extend2; 
// slope calculations for display purpose only
dtrendline_L_extend2 = trendline_L_extend2 - Ref(trendline_L_extend2,-1);
dtrendline_L_extend2 = IIf(PLow,Ref(dtrendline_L_extend,-1),dtrendline_L_extend2);

// upper trendline, segment 1: between fractal points
startval_H = ValueWhen(PHigh,H,1); 
endval_H = ValueWhen(PHigh,H,0); 
startbar_H = ValueWhen(PHigh,xx,1); 
endbar_H = ValueWhen(PHigh,xx,0); 
aa_H = (endval_H-startval_H)/(endbar_H-startbar_H);
bb_H = startval_H;
trendline_H = aa_H * (xx - startbar_H) + bb_H; 
// slope calculations for display purpose only
dtrendline_H = trendline_H - Ref(trendline_H,-1);

// upper extended trendline, segment 2: extend segment 1 to next fractals pivot 
startval_H_extend = ValueWhen(PHigh,H,2); 
endval_H_extend = ValueWhen(PHigh,H,1); 
startbar_H_extend = ValueWhen(PHigh,xx,2); 
endbar_H_extend = ValueWhen(PHigh,xx,1); 
aa_H_extend = (endval_H_extend-startval_H_extend)/(endbar_H_extend-startbar_H_extend);
bb_H_extend = startval_H;
trendline_H_extend = aa_H_extend * (xx - startbar_H) + endval_H_extend; 
// slope calculations for display purpose only
dtrendline_H_extend = trendline_H_extend - Ref(trendline_H_extend,-1);
dtrendline_H_extend = IIf(PHigh,Ref(dtrendline_H,-1),dtrendline_H_extend);

// upper extended trendline, segment 3: extend segment 2 nbars past the fractal pivot
startval_H_extend2 = ValueWhen(PHigh,H,3); 
endval_H_extend2 = ValueWhen(PHigh,H,2); 
startbar_H_extend2 = ValueWhen(PHigh,xx,3); 
endbar_H_extend2 = ValueWhen(PHigh,xx,2); 
aa_H_extend2 = (endval_H_extend2-startval_H_extend2)/(endbar_H_extend2-startbar_H_extend2);
bb_H_extend2 = endval_H_extend2;
trendline_H_extend2 = aa_H_extend2 * (xx - endbar_H_extend2) + endval_H_extend2; 
// slope calculations for display purpose only
dtrendline_H_extend2 = trendline_H_extend2 - Ref(trendline_H_extend2,-1);
dtrendline_H_extend2 = IIf(PHigh,Ref(dtrendline_H_extend,-1),dtrendline_H_extend2);

tld = ParamToggle("All trendlines","show|hide",1);
if (tld)
{
	// omit uptrending upper trendlines and downtrending lower trendlines
	trendline_L = IIf(dtrendline_L > 0,trendline_L,Null);
	trendline_L_extend = IIf(dtrendline_L_extend > 0,trendline_L_extend,Null);
	trendline_L_extend2 = IIf(dtrendline_L_extend2 > 0,trendline_L_extend2,Null);
	trendline_H = IIf(dtrendline_H < 0,trendline_H,Null);
	trendline_H_extend = IIf(dtrendline_H_extend < 0,trendline_H_extend,Null);
	trendline_H_extend2 = IIf(dtrendline_H_extend2 < 0,trendline_H_extend2,Null);
}

trendline_L_extend2 = IIf(BarsSince(Plow) <= nbar,trendline_L_extend2,Null);
trendline_H_extend2 = IIf(BarsSince(PHigh) <= nbar,trendline_H_extend2,Null);

// chart
GraphXSpace = 5;
SetChartOptions(0, chartShowDates);
chartflag = ParamToggle("Heikin Ashi","show|hide",1);
if (chartFlag)
{
	Plot( C, "\nPrice",colorWhite, styleCandle );
} 
else
{
	HaClose = (O+H+L+C)/4; 
	HaOpen = AMA( Ref( HaClose, -1 ), 0.5 ); 
	HaHigh = Max( H, Max( HaClose, HaOpen ) ); 
	HaLow = Min( L, Min( HaClose, HaOpen ) ); 
	PlotOHLC( HaOpen, HaHigh, HaLow, HaClose, "Modified " + Name(), colorWhite, styleCandle );	
}

PlotShapes(shapeSmallCircle*PLow,colorGreen,0,L,-10);
PlotShapes(shapeSmallCircle*PHigh,colorRed,0,H,10);
// segment 1
Plot(trendline_L, "\nLower Trendline", colorBrightGreen,styleLine);
// segment 2, grey dots unconfirmed trend, green confirmed trend
Plot(IIf(BarsSince(Plow) <= nbar,trendline_L_extend,Null), "", colorLightGrey,styleNoLine | styleDots | styleThick);
Plot(IIf(BarsSince(Plow) > nbar,trendline_L_extend,Null), "",colorDarkGreen, styleNoLine | styleDots | styleThick);
// segment 3
Plot(IIf(BarsSince(Plow) <= nbar,trendline_L_extend2,Null), "",colorDarkGreen,styleNoLine | styleDots| styleThick);
// segment 1
Plot(trendline_H, "\nUpper Trendline", colorRed,styleLine);
// segment 2, grey dots unconfirmed trend, green confirmed trend
Plot(IIf(BarsSince(PHigh) <= nbar,trendline_H_extend,Null), "", colorLightGrey, styleNoLine | styleDots | styleThick);
Plot(IIf(BarsSince(PHigh) > nbar,trendline_H_extend,Null), "",colorOrange, styleNoLine | styleDots | styleThick);
// segment 3
Plot(IIf(BarsSince(PHigh) <= nbar,trendline_H_extend2,Null), "",colorOrange, styleNoLine | styleDots | styleThick);

Title = Name() + 
" | " + EncodeColor( colorYellow ) + "nbar: " + nbar + EncodeColor( colorWhite ) +
" | " + EncodeColor( colorBrightGreen ) + "Lower Trendline: " + trendline_L + EncodeColor( colorWhite ) +
" | " + EncodeColor( colorRed ) + "Upper Trendline: " + trendline_H + EncodeColor( colorWhite );

signalFlag = ParamToggle("Possible Signals","show|hide",1);
if (signalFlag)
{
// ***** possible buy and short signal *****
Buy = (!IsEmpty(trendline_H_extend) AND Cross(C,trendline_H_extend) AND BarsSince(PHigh) > nbar) OR 
(!IsEmpty(trendline_H_extend2) AND Cross(C,trendline_H_extend2) AND !PHigh) OR
(PHigh AND C > trendline_H_extend2 AND Ref(C,-1) < Ref(trendline_H_extend,-1) AND !IsEmpty(trendline_H_extend) AND !IsEmpty(trendline_H_extend2) );
BuyPrice = C;
Short = (!IsEmpty(trendline_L_extend) AND Cross(trendline_L_extend,C)  AND BarsSince(PLow) > nbar)  OR 
(!IsEmpty(trendline_L_extend2) AND Cross(trendline_L_extend2,C) AND !PLow) OR
(PLow AND C < trendline_L_extend2 AND Ref(C,-1) > Ref(trendline_L_extend,-1) AND !IsEmpty(trendline_L_extend) AND !IsEmpty(trendline_L_extend2)); 
ShortPrice = C;
Sell = 0;
Cover = 0;

PlotShapes(IIf(Buy,shapeUpArrow,shapeNone),colorGreen,0,L,-15);
PlotShapes(IIf(Buy,shapeHollowUpArrow,shapeNone),colorWhite,0,L,-15);
PlotShapes(IIf(Buy,shapeHollowSmallCircle,shapeNone),colorWhite,0,BuyPrice,0);

PlotShapes(IIf(Short,shapeDownTriangle,shapeNone),colorYellow,0,H,IIf(Short AND Sell,-30,-15));
PlotShapes(IIf(Short,shapeHollowDownTriangle,shapeNone),colorWhite,0,H,IIf(Short AND Sell,-30,-15));
PlotShapes(IIf(Short,shapeHollowCircle,shapeNone),colorWhite,0,ShortPrice,0);
}