Amibroker AFL Code : Demand & Supply Zone Trading

gistfile1.txt

//AUTO : DEMAND AND SUPPLY ZONE
//BY : www.tradingfuel.com
//Date : 18th Aug 2019

_SECTION_BEGIN("Demand");
SetChartOptions(0,chartShowArrows|chartShowDates);
bk=ParamColor( "Bk col",ColorRGB(85,90,60)); 
SetChartBkColor(bk);

amount = Param("Sensitivity", 0.5, 0.1, 2, 0.1 );

array = C ;
zz0 = Zig( array, amount );
zz1 = Ref( zz0, -1 );
zz2 = Ref( zz0, -2 );

tr = ValueWhen(zz0 > zz1 AND zz1 < zz2, zz1);
pk = ValueWhen(zz0 < zz1 AND zz1 > zz2, zz1);
PU = tr + 0.01 * abs(tr)*amount;
PD = pk - 0.01 * abs(pk)*amount;

ZZT = IIf( array >= PU AND zz0 > zz1, 1,
       IIf( array <= PD AND zz0 < zz1, -1, 0 ) );

ZZT = ValueWhen( ZZT != 0, ZZT );

Buy_Valid_=zzt>0;
Sell_Valid_=zzt<0;
Buy_Valid = ExRem(Buy_Valid_,Sell_Valid_);
Sell_Valid = ExRem(Sell_Valid_,Buy_Valid_);
Plot(Ref(Buy_valid,0),"",ColorRGB(0,0,100),styleHistogram|styleDashed|styleOwnScale|styleNoLabel,0,0,0,-1);
Plot(Ref(Sell_valid,0),"",ColorRGB(100,0,0),styleHistogram|styleDashed|styleOwnScale|styleNoLabel,0,0,0,-1);

Candlecol=IIf(BarsSince(Buy_Valid)<BarsSince(Sell_Valid) AND BarsSince(Buy_Valid)!=0,5,
          IIf(BarsSince(Buy_Valid)>BarsSince(Sell_Valid) AND BarsSince(Sell_Valid)!=0,4,1));
cc1=IIf(Buy_valid,colorYellow,IIf(Sell_valid,colorBlack,Candlecol));
SetBarFillColor(Cc1);
Plot(C,"Demand & Supply Zone AFL By NTA Blogger",Cc1,64,0,0,0,0);

pk=BarsSince(Buy_Valid)<BarsSince(Sell_Valid) ;//AND BarsSince(Buy_Valid)!=0;//Zz>Ref(zz,-1);
tr=BarsSince(Buy_Valid)>BarsSince(Sell_Valid) ;//AND BarsSince(Sell_Valid)!=0;//Zz<Ref(zz,-1);

Ll=LowestSince(sell_valid,L,1);
hH=HighestSince(Buy_Valid,H,1);
Llm=LowestSince(sell_valid,Min(O,C),1);
hHm=HighestSince(Buy_Valid,Max(O,C),1);

xx=Cum(1);
NoLines = Param("No of Lines",5,1,10,1);

Col2=ParamColor( "Res Color", colorRed );
Col1=ParamColor( "Sup Color", colorGreen );

for( i = 1; i < NoLines+1 ; i++ )
{
scol=ColorBlend(Col1,2,0.1*i);
rcol=ColorBlend(Col2,2,0.1*i);

px1 = LastValue(ValueWhen(Buy_valid,Cum(1),i)) ;
py1 = LastValue(ValueWhen(Buy_valid,Ll,i)) ;
pz1 = LineArray(px1, py1, (BarCount-1), py1);
Plot(pz1,"",scol,32);

tx1 = LastValue(ValueWhen(sell_valid,Cum(1),i)) ;
ty1 = LastValue(ValueWhen(sell_valid,Hh,i)) ;
tz1 = LineArray(tx1, ty1, (BarCount-1), ty1);
Plot(tz1,"",rcol,32);

px1m = LastValue(ValueWhen(Buy_valid,Cum(1),i)) ;
py1m = LastValue(ValueWhen(Buy_valid,Llm,i)) ;
pz1m = LineArray(px1m, py1m, (BarCount-1), py1m);
PlotOHLC(pz1,pz1,pz1m,pz1m,"",scol,styleCloud|styleNoLabel,0,0,0,-i-nolines);

tx1m = LastValue(ValueWhen(sell_valid,Cum(1),i)) ;
ty1m = LastValue(ValueWhen(sell_valid,Hhm,i)) ;
tz1m = LineArray(tx1m, ty1m, (BarCount-1), ty1m);
PlotOHLC(tz1,tz1,tz1m,tz1m,"",rcol,styleCloud|styleNoLabel,0,0,0,-i-nolines);
}

for( j = 0; j < BarCount; j++ ) 
{ 
if( Buy_valid [j])  PlotText( "Dz\n"+Ll[ j ], j, Ll[j], colorPaleGreen ); 
if( Sell_valid[j] ) PlotText( "Sz\n"+Hh[ j ], j, Hh[j], colorRose); 
} 
_SECTION_END();

not working