Major Support Resistance Trend Line - Amibroker AFL Code

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///////////////////////////////////////////////////////////////////////////////////////////
SetChartOptions(0,chartShowArrows|chartShowDates);
_N(Title = StrFormat("{{NAME}} - {{INTERVAL}} {{DATE}} ,{{VALUES}}", O, H, L, C, SelectedValue( ROC( C, 1 ) ) ));
Plot(C, "", IIf(O>=C, colorRed, colorBlue),styleCandle);

SetChartBkGradientFill( ParamColor("Inner panel upper",colorBlack),ParamColor("Inner panel lower",colorBlack));
_N(Title = EncodeColor(colorWhite)+StrFormat(" {{NAME}} - {{INTERVAL}} {{DATE}} Open:%g, Close:%g ,{{VALUES}}",O,C ));

/////////////////////////////////////////////////////////////////////////////////////////////

Plot(EMA(C,5),"",colorYellow);
/////////////////////////////////////////////////////////////

per1=Param ("per1", 0.1,0.1,50,0.10);

per=per1;
x = Cum(1);
s1=L;
s11=H;
pS = TroughBars( s1, per, 1 ) == 0;
endt= SelectedValue(ValueWhen( pS, x, 1 ));
startt=SelectedValue(ValueWhen( pS, x, 2 ));
dtS =endt-startt;
endS = SelectedValue(ValueWhen( pS, s1, 1 ) );
startS = SelectedValue( ValueWhen( pS, s1, 1 ));
aS = (endS-startS)/dtS;
bS = endS;
trendlineS = aS * ( x -endt ) + bS;
g3= IIf(x>startt-10,trendlineS,-1e10);
Plot(g3,"",colorRed,styleDots,styleThick);

pR = PeakBars( s11, per, 1 ) == 0;
endt1= SelectedValue(ValueWhen( pR, x, 1 ));
startt1=SelectedValue(ValueWhen( pR, x, 2 ));
dtR =endt1-startt1;
endR = SelectedValue(ValueWhen( pR, s11, 1 ) );
startR = SelectedValue( ValueWhen( pR, s11, 1 ));
aR = (endR-startR)/dtR;
bR = endR;
trendlineR = aR * ( x -endt1 ) + bR;
g4= IIf(x>startT1-10,trendlineR,-1e10);
Plot(g4,"",colorGreen,styleDots,styleThick);
//////////////////////////////////////////////////////////////////////////////////////////////////
perc=per1;
x=BarIndex();xx=SelectedValue(x);
t1=SelectedValue(ValueWhen(PeakBars(C,perc)==0,x)) ;
H1=SelectedValue(ValueWhen(PeakBars(C,perc)==0,C)) ;
t11=SelectedValue(ValueWhen(TroughBars(C,perc)==0, x));
H11=SelectedValue(ValueWhen(TroughBars(C,perc)==0, C));
g=t1>t11;
shape=IIf(g,shapeDownArrow*(x==t1),shapeUpArrow*(x ==t11));
Color=IIf(g,colorRed,colorGreen);
PlotShapes(shape,color);
/////////////////////////////////////////////////////////////////////////////////////////////////

per=per1;

x = Cum(1);
s1=C;
s11=C;
pS = TroughBars( s1, per, 1 ) == 0;
endt= SelectedValue(ValueWhen( pS, x, 1 ));
startt=SelectedValue(ValueWhen( pS, x, 2 ));
dtS =endt-startt;
endS = SelectedValue(ValueWhen( pS, s1, 1 ) );
startS = SelectedValue( ValueWhen( pS, s1, 2 ));
aS = (endS-startS)/dtS;
bS = endS;
trendlineS = aS * ( x -endt ) + bS;
g3= IIf(x>startt-10,trendlineS,-1e10);
Plot(g3,"",colorRed,styleThick);

pR = PeakBars( s11, per, 1 ) == 0;
endt1= SelectedValue(ValueWhen( pR, x, 1 ));
startt1=SelectedValue(ValueWhen( pR, x, 2 ));
dtR =endt1-startt1;
endR = SelectedValue(ValueWhen( pR, s11, 1 ) );
startR = SelectedValue( ValueWhen( pR, s11, 2 ));
aR = (endR-startR)/dtR;
bR = endR;
trendlineR = aR * ( x -endt1 ) + bR;
g4= IIf(x>startT1-10,trendlineR,-1e10);
Plot(g4,"",colorGreen,styleThick);
//////////////////////////////////////////////////////////////////////////////
_SECTION_BEGIN("PAC - ZTEMA");
SetChartOptions(0,chartShowDates|chartShowArrows|chartLogarithmic|chartWrapTitle);
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(), colorRose, styleCandle );

TC = MA( High, 5 );
BC = MA( Low, 5 );

Plot(tc, "", colorYellow);
Plot(bc, "", colorYellow);

a = haClose > TC;
b = haClose < BC;

state=IIf(BarsSince(a)<BarsSince(b),1,0);

Buy = Cross(a,b);
Sell = Cross(b,a);

PlotShapes( IIf(Buy, shapeUpArrow,0) , colorLime,0,HaLow,-20);
PlotShapes( IIf(Sell, shapeDownArrow,0) , colorOrange,0,HaHigh,-20);
GraphZOrder = 1;
_SECTION_END();