Displaying Trendlines , zigzag buy sell ..really amazing Pastie For Amibroker (AFL)

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//////////////////////////////////////////////////////////////////////////////////////////
 
 
//z_ZigZagValid
// ******** CHARTING
per=Param ("per1", 0.325,0.1,50,0.10);
 
PercentChange = per;
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_Valid = IIf(C>(1+(LastValue(PercentChange)/100))*(ValueWhen(PivotLow, C,
1))
AND ROC(ZZ,1) > 0,1,0); 
Sell_Valid = IIf(C<(1-(LastValue(PercentChange)/100))*(ValueWhen(PivotHigh, C,
1))
AND ROC(ZZ,1) < 0,1,0); 
 
Buy_Valid = ExRem(Buy_Valid,Sell_Valid);
Sell_Valid = ExRem(Sell_Valid,Buy_Valid);
 
PlotShapes( shapeUpArrow*Buy_Valid, colorGreen,0, L, -20); 
PlotShapes( shapeDownArrow*Sell_Valid, colorRed,0,H, -20) ;
 
BarColors = 
IIf(BarsSince(Buy_Valid) < BarsSince(Sell_Valid) 
AND BarsSince(Buy_Valid)!=0, colorGreen,
IIf(BarsSince(Sell_Valid) < BarsSince(Buy_Valid)
AND BarsSince(Sell_Valid)!=0, colorRed, colorBlue));
 
Plot(C, " ", BarColors, styleCandle ) ; 
Plot(ZZ," ", colorLightGrey,styleLine|styleThick);
Plot(ZZ," ", BarColors,styleDots|styleNoLine);
 
Title = Name() + " " + Date() + WriteIf(PivotLow, " Up Pivot
","")+WriteIf(PivotHigh," Down Pivot ","")+ WriteIf(Buy_Valid, " Buy Point ",
"") + WriteIf(Sell_Valid, " Sell Point ", "") ;
 
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 
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);
 
//////////////////////////////////////////////////////////////////////////////////////

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Trendlines , zigzag buy sell ..really amazing for Amibroker (AFL)