_SECTION_BEGIN("zigzagpivotscan");
//z_ZigZagValid
// ******** CHARTING 
PercentChange = 6;
mystartbar = SelectedValue(BarIndex());  // FOR GRAPHING

mystartbardate = LastValue(ValueWhen(mystartbar == BarIndex(), DateNum(),1));

InitialValue = LastValue(ValueWhen(mystartbardate == DateNum(), C , 1 ) ) ;
Temp1 = IIf(BarIndex() >= mystartbar, InitialValue, Null) ;
Plot(Temp1, " ", colorBlack,styleLine);
Plot((1+(LastValue(PercentChange)/100))*(Temp1), " ", colorGreen, styleLine) ;
Plot((1-(LastValue(PercentChange)/100))*(Temp1), " ", colorRed, styleLine) ;

ZZ = Zig(C,LastValue(PercentChange)) ; 
PivotLow = Ref(IIf(Ref(ROC(ZZ,1),-1) < 0 AND ROC(ZZ,1) > 0, 1, Null),1);
PivotHigh = Ref(IIf(Ref(ROC(ZZ,1),-1) > 0 AND ROC(ZZ,1) < 0, 1, Null),1);

PlotShapes( shapeCircle*PivotLow, colorGreen,0, L, -20) ; 
PlotShapes( shapeCircle*PivotHigh,colorRed,0,H, 20) ;

Buy = IIf(C>(1+(LastValue(PercentChange)/100))*(ValueWhen(PivotLow, C, 1))
AND ROC(ZZ,1) > 0,1,0); 
Sell = IIf(C<(1-(LastValue(PercentChange)/100))*(ValueWhen(PivotHigh, C, 1))
AND ROC(ZZ,1) < 0,1,0); 

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

PlotShapes( shapeUpArrow*Buy, colorGreen,0, L, -20); 
PlotShapes( shapeDownArrow*Sell, colorRed,0,H, -20) ;

BarColors = 
IIf(BarsSince(Buy) < BarsSince(Sell) 
AND BarsSince(Buy)!=0, colorGreen,
IIf(BarsSince(Sell) < BarsSince(Buy)
AND BarsSince(Sell)!=0,  colorRed, colorBlue));

Plot(C, " ", BarColors,  styleBar ) ; 
Plot(ZZ," ", colorLightGrey,styleLine|styleThick);
Plot(ZZ," ", BarColors,styleDots|styleNoLine);

Title = Name() + " " + Date() + WriteIf(PivotLow, " Up Pivot ","")+WriteIf(PivotHigh," Down Pivot ","")+ WriteIf(Buy, " Buy Point ", "") + WriteIf(Sell, " Sell Point ", "") ;

AlertIf(Buy,   "", "",1,1 );
AlertIf(Sell,  "", "",2,1 );
_SECTION_END();